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  • swf listens to XML, AS3

    - by VideoDnd
    My swf listens to XML from a socket and document. How do I get 'my variables' to grab XML from the socket instead of the XML document? PURPOSE My purpose is to control variables with a XML Socket Server. I hope my question is clear, but ask if there's any questions. EXAMPLE Flash File import flash.net.*; import flash.display.*; import flash.events.*; import flash.system.Security; import flash.utils.Timer; import flash.events.TimerEvent; //MY VARIABLES, LINE 8-12 var timer:Timer = new Timer(10); var myString:String = ""; var count:int = 0; var myStg:String = ""; var fcount:int = 0; var xml_s=new XMLSocket(); xml_s.addEventListener(Event.CONNECT, socket_event_catcher);//OnConnect// xml_s.addEventListener(Event.CLOSE, socket_event_catcher);//OnDisconnect// xml_s.addEventListener(IOErrorEvent.IO_ERROR, socket_event_catcher);//Unable To Connect// xml_s.addEventListener(DataEvent.DATA, socket_event_catcher);//OnDisconnect// xml_s.connect("localhost", 1999); function socket_event_catcher(Event):void { switch (Event.type) { case 'ioError' : trace("ioError: " + Event.text);//Unable to Connect :(// break; case 'connect' : trace("Connection Established!");//Connected :)// break; case 'data' : trace("Received Data: " + Event.data); //var myXML:XML=new XML(Event.data); //trace("myXML.body.file: " + myXML.body.file); //var myLoader:String=myXML.body.file; //var urlReq:URLRequest=new URLRequest(myLoader); //trace("file to load URL: " + urlReq); break; case 'close' : trace("Connection Closed!");//OnDisconnect :( // xml_s.close(); break; } } //LOAD XML var myXML:XML; var myLoader:URLLoader = new URLLoader(); myLoader.load(new URLRequest("time.xml")); myLoader.addEventListener(Event.COMPLETE, processXML); //var myXML:XML=new XML(Event.data); //trace("myXML.body.file: " + myXML.body.file); //var DOINK:String=myXML.body.file; //var urlReq:URLRequest=new URLRequest(DOINK); //trace("file to load URL: " + urlReq); //PARSE XML function processXML(e:Event):void { myXML = new XML(e.target.data); trace(myXML.COUNT.text()); //-77777 //grab the data as a string myString = myXML.COUNT.text() //grab the data as an int count = int(myXML.COUNT.text()); //grab the data as a string myString = myXML.COUNT.text() //grab the data as an int count = int(myXML.COUNT.text()); //grab the data as a string myStg = myXML.COUNT.text() //grab the data as an int fcount = int(myXML.COUNT.text()); //grab the data as a string myStg = myXML.COUNT.text() //grab the data as an int fcount = int(myXML.COUNT.text()); trace("String: ", myString); trace("Int: ", count); trace(count - 1); //just to show you that it's a number that you can do math with (-77778) //TEXT var text:TextField = new TextField(); text.text = myString; addChild(text); } Ruby Server 'Snippet' msg1 = {"msg" => {"head" => {"type" => "frctl", "seq_no" => seq_no, "version" => 1.0}, "SESSION" => {"text" => "88888", "timer" => -1000, "count" => 10, "fcount" => "10"}}} XML <?xml version="1.0" encoding="utf-8"?> <SESSION> <TIMER TITLE="speed">100</TIMER> <COUNT TITLE="starting position">88888</COUNT> <FCOUNT TITLE="ramp">1000</FCOUNT> </SESSION> ENVIROMENT AS3 Ruby 186-25 PROBLEM Coding errors "coercion of value"

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  • How can I get SQL Server transactions to use record-level locks?

    - by Joe White
    We have an application that was originally written as a desktop app, lo these many years ago. It starts a transaction whenever you open an edit screen, and commits if you click OK, or rolls back if you click Cancel. This worked okay for a desktop app, but now we're trying to move to ADO.NET and SQL Server, and the long-running transactions are problematic. I found that we'll have a problem when multiple users are all trying to edit (different subsets of) the same table at the same time. In our old database, each user's transaction would acquire record-level locks to every record they modified during their transaction; since different users were editing different records, everyone gets their own locks and everything works. But in SQL Server, as soon as one user edits a record inside a transaction, SQL Server appears to get a lock on the entire table. When a second user tries to edit a different record in the same table, the second user's app simply locks up, because the SqlConnection blocks until the first user either commits or rolls back. I'm aware that long-running transactions are bad, and I know that the best solution would be to change these screens so that they no longer keep transactions open for a long time. But since that would mean some invasive and risky changes, I also want to research whether there's a way to get this code up and running as-is, just so I know what my options are. How can I get two different users' transactions in SQL Server to lock individual records instead of the entire table? Here's a quick-and-dirty console app that illustrates the issue. I've created a database called "test1", with one table called "Values" that just has ID (int) and Value (nvarchar) columns. If you run the app, it asks for an ID to modify, starts a transaction, modifies that record, and then leaves the transaction open until you press ENTER. I want to be able to start the program and tell it to update ID 1; let it get its transaction and modify the record; start a second copy of the program and tell it to update ID 2; have it able to update (and commit) while the first app's transaction is still open. Currently it freezes at step 4, until I go back to the first copy of the app and close it or press ENTER so it commits. The call to command.ExecuteNonQuery blocks until the first connection is closed. public static void Main() { Console.Write("ID to update: "); var id = int.Parse(Console.ReadLine()); Console.WriteLine("Starting transaction"); using (var scope = new TransactionScope()) using (var connection = new SqlConnection(@"Data Source=localhost\sqlexpress;Initial Catalog=test1;Integrated Security=True")) { connection.Open(); var command = connection.CreateCommand(); command.CommandText = "UPDATE [Values] SET Value = 'Value' WHERE ID = " + id; Console.WriteLine("Updating record"); command.ExecuteNonQuery(); Console.Write("Press ENTER to end transaction: "); Console.ReadLine(); scope.Complete(); } } Here are some things I've already tried, with no change in behavior: Changing the transaction isolation level to "read uncommitted" Specifying a "WITH (ROWLOCK)" on the UPDATE statement

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  • Why am I getting 'Argument count mismatch' error here?

    - by Leon
    I have a Document class, Intro class and Nav class. The Intro class runs first, then sends a custom dispatch event to run the Nav class, but I'm getting this error: removed Intro ArgumentError: Error #1063: Argument count mismatch on com.secrettowriting.StanPlayer.ui::Navigation/addNav(). Expected 0, got 1. at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at com.secrettowriting.StanPlayer.display::Intro/removeIntro() at flash.utils::Timer/_timerDispatch() at flash.utils::Timer/tick() The addNav function in the Navigation class should expect 0 arguments/variables and I'm not sending any arguments/variables to it, which is why I'm confused as to why it's saying I'm getting 1. My Document Class: public function HomePlayer():void { if (stage) init(); else addEventListener(Event.ADDED_TO_STAGE, init); } private function init(e:Event = null):void { removeEventListener(Event.ADDED_TO_STAGE, init); stage.scaleMode = StageScaleMode.NO_SCALE; stage.align = StageAlign.TOP_LEFT; // Use when Live //videoURL = this.loaderInfo.parameters.theVIDEO; // Get the Video URL from HTML // Remove when video testing ready videoURL = "videos/WhatDifferentiatesUs.flv"; drawNav(); drawIntro(); } private function drawIntro():void { intro = new Intro(); intro.drawIntro(); intro.addEventListener("onComplete", nav.addNav); stage.addChild(intro); } private function drawNav():void { nav = new Navigation(); nav.drawNav(); stage.addChild(nav); } Intro Class: Public function Intro():void { if (stage) init(); else addEventListener(Event.ADDED_TO_STAGE, init); } private function init(e:Event = null):void { removeEventListener(Event.ADDED_TO_STAGE, init); } public function drawIntro():void { introMov = new IntroMov(); introMov.alpha = 0; addChild(introMov); TweenLite.to(introMov, 3, {alpha:1}); // Timer introFader = new Timer(INTRO_DELAY); introFader.addEventListener(TimerEvent.TIMER, fadeIntro); introFader.start(); introRemover = new Timer(INTRO_DELAY); introRemover.addEventListener(TimerEvent.TIMER, removeIntro); } private function fadeIntro(e:TimerEvent):void { if (i < 30){ i++ } else if (i == 30){ TweenLite.to(introMov, 1.5, {alpha:0}); introFader.removeEventListener(TimerEvent.TIMER, fadeIntro); introRemover.start(); } } private function removeIntro(e:TimerEvent):void { if (n < 10){ n++ } else if (n == 10){ introRemover.removeEventListener(TimerEvent.TIMER, removeIntro); removeChild(introMov); trace("removed Intro"); dispatchEvent (new CustomEvent(CustomEvent.COMPLETE, {})); // ? Intro to Navigation } } Navigation Class functions: public function drawNav():void { weAreA = new WeAreA(); weAreA.alpha = 0; weAreA.x = 20; weAreA.y = 35; introText = new IntroText(); introText.alpha = 0; introText.x = 20; introText.y = 124; chooseAVideo = new ChooseAVideo(); chooseAVideo.alpha = 0; chooseAVideo.x = 20; chooseAVideo.y = 336; } public function addNav():void { addChild(weAreA); addChild(introText); addChild(chooseAVideo); TweenLite.to(weAreA, 2, {alpha:1}); TweenLite.to(introText, 3, {alpha:1}); TweenLite.to(introText, 3, {alpha:1}); }

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  • "Could not establish secure channel for SSL/TLS" in .NET CF application on smart phone

    - by Stefan Mohr
    I have a stubborn communications issue with an application running on the .NET Compact Framework 3.5 on Windows Mobile smartphones. I am constructing a web request using this code: UTF8Encoding encoding = new System.Text.UTF8Encoding(); byte[] Data = encoding.GetBytes(HttpUtility.ConstructQueryString(parameters)); httpRequest = WebRequest.Create((domain)) as HttpWebRequest; httpRequest.Timeout = 10000000; httpRequest.ReadWriteTimeout = 10000000; httpRequest.Credentials = CredentialCache.DefaultCredentials; httpRequest.Method = "POST"; httpRequest.ContentType = "application/x-www-form-urlencoded"; httpRequest.ContentLength = Data.Length; Stream SendReq = httpRequest.GetRequestStream(); SendReq.Write(Data, 0, Data.Length); SendReq.Close(); HttpWebResponse httpResponse = (HttpWebResponse)httpRequest.GetResponse(); return httpResponse.GetResponseStream(); The web service functions by receiving a JSON-encoded document as part of the URL (eg. https://site.com/ws/sync??document={"version":"1.0.0","items":[{"item_1":"item1"}]}&user=usr&password=pw), and as a response receives another JSON document as response data. This code runs fine on all emulators and PDAs running WM 5 and 6. We have seen an issue with a couple of customers running Treo smartphones (and only on the Sprint network). We have tested the code on an identical device on the AT&T network (via DeviceAnywhere) and once again the code worked as we expected. This has to be some sort of security policy on the phone, but we've been unable to determine a workaround or diagnose it thoroughly as we cannot reproduce it in house and have had to resort to getting users to assist with running test drivers for us. When this code executes, the user's device throws the following exception: System.Net.WebException Could not establish secure channel for SSL/TLS Stack trace: at System.Net.HttpWebRequest.finishGetRequestStream() at System.Net.HttpWebRequest.GetRequestStream() at OurApp.GetResponseStream(String domain, Hashtable parameters) inner exception: System.IO.IOException Authentication failed because the remote party has closed the transport stream. Stack trace: at System.Net.SslConnectionState.ClientSideHandshake() at System.Net.SslConnectionState.PerformClientHandShake() at System.Net.Connection.connect(Object ignored) at System.Threading.ThreadPool.WorkItem.doWork(Object o) at System.Threading.Timer.ring() Examining the server Apache logs shows no hits from the user's IP - I don't think the device is even attempting to send a packet before failing. If relevant, the server is running Apache on Linux and is written using the TurboGears Python framework. The server certificate is issued by a CA and is still valid. The test driver where this error was copied from was not code signed, however the same error (without the error messages) is signed with a GeoTrust certificate so we don't believe this is a code signing issue. The application installs and launches without issue on all phones - it's just establishing this SSL connection that is breaking for these users. One significant issue in troubleshooting is that there is a substantial inconvenience each time we try out a solution (need to find a "volunteer" customer), so we're really looking for a silver bullet or a better understanding of the handshaking process so we can be reasonably confident we only need to ask the user to test it one or two more times. One final mention: we have tried the sync both over ActiveSync and also over GPRS with identical results. Any thoughts would be greatly appreciated!

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  • Problem running oracle script from command line using sqlplus

    - by Charlie
    I'm having a problem trying to run my sql script into oracle using sqlplus. The script just populates some dummy data: DECLARE role1Id NUMBER; user1Id NUMBER; role2Id NUMBER; user2Id NUMBER; role3Id NUMBER; user3Id NUMBER; perm1Id NUMBER; perm2Id NUMBER; perm3Id NUMBER; perm4Id NUMBER; perm5Id NUMBER; BEGIN INSERT INTO PB_USER(USER_ID,USER_NAME, USER_EMAIL, USER_ACTIVEYN) VALUES(PB_USER_ID_SEQ.nextval, 'RoleDataManagerTests_Username', '[email protected]',' '); INSERT INTO ROLES(ROLE_ID, ROLE_NAME) VALUES(PB_ROLE_ID_SEQ.nextval, 'Test role 1'); INSERT INTO ROLES(ROLE_ID, ROLE_NAME) VALUES(PB_ROLE_ID_SEQ.nextval, 'Test role 2'); INSERT INTO ROLES(ROLE_ID, ROLE_NAME) VALUES(PB_ROLE_ID_SEQ.nextval, 'Test role 3'); SELECT ROLE_ID INTO role1Id FROM ROLES WHERE ROLE_NAME = 'Test role 1'; SELECT USER_ID INTO user1Id FROM PB_USER WHERE USER_NAME = 'RoleDataManagerTests_Username'; INSERT INTO USERS_ROLES(USER_ID, ROLE_ID) VALUES(user1Id, role1Id); SELECT ROLE_ID INTO role2Id FROM ROLES WHERE ROLE_NAME = 'Test role 2'; SELECT USER_ID INTO user2Id FROM PB_USER WHERE USER_NAME = 'RoleDataManagerTests_Username'; INSERT INTO USERS_ROLES(USER_ID, ROLE_ID) VALUES(user2Id, role2Id); SELECT ROLE_ID INTO role3Id FROM ROLES WHERE ROLE_NAME = 'Test role 3'; SELECT USER_ID INTO user3Id FROM PB_USER WHERE USER_NAME = 'RoleDataManagerTests_Username'; INSERT INTO USERS_ROLES(USER_ID, ROLE_ID) VALUES(user3Id, role3Id); INSERT INTO PERMISSIONS(PERMISSION_ID, KEY, DESCRIPTION) VALUES (PB_PERMISSION_ID_SEQ.nextval, 'perm1', 'permission 1'); INSERT INTO PERMISSIONS(PERMISSION_ID, KEY, DESCRIPTION) VALUES (PB_PERMISSION_ID_SEQ.nextval, 'perm2', 'permission 2'); INSERT INTO PERMISSIONS(PERMISSION_ID, KEY, DESCRIPTION) VALUES (PB_PERMISSION_ID_SEQ.nextval, 'perm3', 'permission 3'); INSERT INTO PERMISSIONS(PERMISSION_ID, KEY, DESCRIPTION) VALUES (PB_PERMISSION_ID_SEQ.nextval, 'perm4', 'permission 4'); INSERT INTO PERMISSIONS(PERMISSION_ID, KEY, DESCRIPTION) VALUES (PB_PERMISSION_ID_SEQ.nextval, 'perm5', 'permission 5'); SELECT PERMISSION_ID INTO perm1Id FROM PERMISSIONS WHERE KEY = 'perm1'; SELECT PERMISSION_ID INTO perm2Id FROM PERMISSIONS WHERE KEY = 'perm2'; SELECT PERMISSION_ID INTO perm3Id FROM PERMISSIONS WHERE KEY = 'perm3'; SELECT PERMISSION_ID INTO perm4Id FROM PERMISSIONS WHERE KEY = 'perm4'; SELECT PERMISSION_ID INTO perm5Id FROM PERMISSIONS WHERE KEY = 'perm5'; INSERT INTO ROLES_PERMISSIONS(ROLE_ID, PERMISSION_ID) VALUES(role1Id, perm1Id); INSERT INTO ROLES_PERMISSIONS(ROLE_ID, PERMISSION_ID) VALUES(role1Id, perm2Id); INSERT INTO ROLES_PERMISSIONS(ROLE_ID, PERMISSION_ID) VALUES(role1Id, perm3Id); INSERT INTO ROLES_PERMISSIONS(ROLE_ID, PERMISSION_ID) VALUES(role2Id, perm3Id); INSERT INTO ROLES_PERMISSIONS(ROLE_ID, PERMISSION_ID) VALUES(role3Id, perm4Id); INSERT INTO ROLES_PERMISSIONS(ROLE_ID, PERMISSION_ID) VALUES(role3Id, perm5Id); END; / My script works fine when I run it using Oracle SQL Developer but when I use the sqlplus command line tool this is what's outputted and then it just hangs: SQL*Plus: Release 11.1.0.7.0 - Production on Tue May 11 09:49:34 2010 Copyright (c) 1982, 2008, Oracle. All rights reserved. Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production With the Partitioning, Oracle Label Security, OLAP, Data Mining Scoring Engine and Real Application Testing options I'm running the tool using this command line, which works fine for other scripts: sqlplus username/password@server/dbname @Setup.sql Any ideas? Thanks.

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  • xsl:include fails after upgrading PHP version; is libxml/libxslt version mismatch the issue?

    - by Wiseguy
    I'm running Windows XP with the precompiled PHP binaries available from windows.php.net. I upgraded from PHP 5.2.5 to PHP 5.2.16, and now the xsl:includes in some of my stylesheets stopped working. Testing each version in succession, I discovered that it worked up through 5.2.8 and does not work in 5.2.9+. I now get the following three errors for each xsl:include. Warning: XSLTProcessor::importStylesheet() [xsltprocessor.importstylesheet]: I/O warning : failed to load external entity "file%3A/C%3A/path/to/included/stylesheet.xsl" in ... on line 227 Warning: XSLTProcessor::importStylesheet() [xsltprocessor.importstylesheet]: compilation error: file file%3A//C%3A/path/to/included/stylesheet.xsl line 36 element include in ... on line 227 Warning: XSLTProcessor::importStylesheet() [xsltprocessor.importstylesheet]: xsl:include : unable to load file%3A/C%3A/path/to/included/stylesheet.xsl in ... on line 227 I presume this is because it cannot find the specified file. Many of the includes are in the same directory as the stylesheet being transformed and have no directory in the path, i.e. <xsl:include href="fileInSameDir.xsl">. Interestingly, in the first and third errors, it is displaying the file:// protocol with only one slash instead of the correct two. I'm guessing that's the problem. (When I hard-code a full path using "file:/" it fails, but when I hard-code a full path with "file://" it works.) But what could cause that? A bug in libxslt/libxml? I also found an apparent version mismatch between libxml and the version of libxml that libxslt was compiled against. 5.2.5 libxml Version = 2.6.26 libxslt compiled against libxml Version = 2.6.26 5.2.8 libxml Version = 2.6.32 libxslt compiled against libxml Version = 2.6.32 === it breaks in versions starting at 5.2.9 === 5.2.9 libxml Version = 2.7.3 libxslt compiled against libxml Version = 2.6.32 5.2.16 libxml Version = 2.7.7 libxslt compiled against libxml Version = 2.6.32 Up until PHP 5.2.9, libxslt was compiled against the same version of libxml that was included with PHP. But starting with PHP 5.2.9, libxslt was compiled against an older version of libxml than that which was included with PHP. Is this a problem with the distributed binaries or just a coincidence? To test this, I imagine PHP could be built with different versions of libxml/libxslt to see which combinations work or don't. Unfortunately, I'm out of my element in a Windows world, and building PHP on Windows seems over my head. Regrettably, I've been thus far unable to reproduce this problem with an example outside my app, so I'm struggling to narrow it down and can't submit a specific bug. So, do you think it is caused by a version mismatch problem in the distributed binaries? a bug introduced in PHP 5.2.9? a bug introduced in libxml 2.7? something else? I'm stumped. Any thoughts that could point me in the right direction are greatly appreciated. Thanks.

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  • Better, simpler example of 'semantic conflict'?

    - by rhubbarb
    I like to distinguish three different types of conflict from a version control system (VCS): textual syntactic semantic A textual conflict is one that is detected by the merge or update process. This is flagged by the system. A commit of the result is not permitted by the VCS until the conflict is resolved. A syntactic conflict is not flagged by the VCS, but the result will not compile. Therefore this should also be picked up by even a slightly careful programmer. (A simple example might be a variable rename by Left and some added lines using that variable by Right. The merge will probably have an unresolved symbol. Alternatively, this might introduce a semantic conflict by variable hiding.) Finally, a semantic conflict is not flagged by the VCS, the result compiles, but the code may have problems running. In mild cases, incorrect results are produced. In severe cases, a crash could be introduced. Even these should be detected before commit by a very careful programmer, through either code review or unit testing. My example of a semantic conflict uses SVN (Subversion) and C++, but those choices are not really relevant to the essence of the question. The base code is: int i = 0; int odds = 0; while (i < 10) { if ((i & 1) != 0) { odds *= 10; odds += i; } // next ++ i; } assert (odds == 13579) The Left (L) and Right (R) changes are as follows. Left's 'optimisation' (changing the values the loop variable takes): int i = 1; // L int odds = 0; while (i < 10) { if ((i & 1) != 0) { odds *= 10; odds += i; } // next i += 2; // L } assert (odds == 13579) Right's 'optimisation' (changing how the loop variable is used): int i = 0; int odds = 0; while (i < 5) // R { odds *= 10; odds += 2 * i + 1; // R // next ++ i; } assert (odds == 13579) This is the result of a merge or update, and is not detected by SVN (which is correct behaviour for the VCS). int i = 1; // L int odds = 0; while (i < 5) // R { odds *= 10; odds += 2 * i + 1; // R // next i += 2; // L } assert (odds == 13579) The assert fails because odds is 37. So my question is as follows. Is there a simpler example than this? Is there a simple example where the compiled executable has a new crash? As a secondary question, are there cases of this that you have encountered in real code? Again, simple examples are especially welcome.

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  • Modern alternatives to Java

    - by Ralph
    I have been a Java developer for 14 years and have written an enterprise-level (~500 kloc) Swing application that uses most of the standard library APIs. Recently, I have become disappointed with the progress that the language has made to "modernize" itself, and am looking for an alternative for ongoing development. I have considered moving to the .NET platform, but I have issues with using something the only runs well in Windows (I know about Mono, but that is still far behind Microsoft). I also plan on buying a new Macbook Pro as soon as Apple releases their new rumored Arrandale-based machines and want to develop in an environment that will feel "at home" in Unix/Linux. I have considered using Python or Ruby, but the standard Java library is arguably the largest of any modern language. In JVM-based languages, I looked at Groovy, but am disappointed with its performance. Rumor has it that with the soon-to-be released JDK7, with its InvokeDynamic instruction, this will improve, but I don't know how much. Groovy is also not truly a functional language, although it provides closures and some of the "functional" features on collections. It does not embrace immutability. I have narrowed my search down to two JVM-based alternatives: Scala and Clojure. Each has its strengths and weaknesses. I am looking for opinions. I am not an expert at either of these languages; I have read 2 1/2 books on Scala and am currently reading Stu Halloway's book on Clojure. Scala is strongly statically typed. I know the dynamic language folks claim that static typing is a crutch for not doing unit testing, but it does provide a mechanism for compile-time location of a whole class of errors. Scala is more concise than Java, but not as much as Clojure. Scala's inter-operation with Java seems to be better than Clojure's, in that most Java operations are easier to do in Scala than in Clojure. For example, I can find no way in Clojure to create a non-static initialization block in a class derived from a Java superclass. For example, I like the Apache commons CLI library for command line argument parsing. In Java and Scala, I can create a new Options object and add Option items to it in an initialization block as follows (Java code): final Options options = new Options() { { addOption(new Option("?", "help", false, "Show this usage information"); // other options } }; I can't figure out how to the same thing in Clojure (except by using (doit...)), although that may reflect my lack of knowledge of the language. Clojure's collections are optimized for immutability. They rarely require copy-on-write semantics. I don't know if Scala's immutable collections are implemented using similar algorithms, but Rich Hickey (Clojure's inventor) goes out of his way to explain how that language's data structures are efficient. Clojure was designed from the beginning for concurrency (as was Scala) and with modern multi-core processors, concurrency takes on more importance, but I occasionally need to write simple non-concurrent utilities, and Scala code probably runs a little faster for these applications since it discourages, but does not prohibit, "simple" mutability. One could argue that one-off utilities do not have to be super-fast, but sometimes they do tasks that take hours or days to complete. I know that there is no right answer to this "question", but I thought I would open it up for discussion. Are there other JVM-based languages that can be used for enterprise level development?

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  • [C#] Not enough memory or not enough handles?

    - by Nayan
    I am working on a large scale project where a custom (pretty good and robust) framework has been provided and we have to use that for showing up forms and views. There is abstract class StrategyEditor (derived from some class in framework) which is instantiated whenever a new StrategyForm is opened. StrategyForm (a customized window frame) contains StrategyEditor. StrategyEditor contains StrategyTab. StrategyTab contains StrategyCanvas. This is a small portion of the big classes to clarify that there are many objects that will be created if one StrategyForm object is allocated in memory at run-time. My component owns all these classes mentioned above except StrategyForm whose code is not in my control. Now, at run-time, user opens up many strategy objects (which trigger creation of new StrategyForm object.) After creating approx. 44 strategy objects, we see that the USER OBJECT HANDLES (I'll use UOH from here onwards) created by the application reaches to about 20k+, while in registry the default amount for handles is 10k. Read more about User Objects here. Testing on different machines made it clear that the number of strategy objects opened is different for message to pop-up - on one m/c if it is 44, then it can be 40 on another. When we see the message pop-up, it means that the application is going to respond slowly. It gets worse with few more objects and then creation of window frames and subsequent objects fail. We first thought that it was not-enough-memory issue. But then reading more about new in C# helped in understanding that an exception would be thrown if app ran out of memory. This is not a memory issue then, I feel (task manager also showed 1.5GB+ available memory.) M/C specs Core 2 Duo 2GHz+ 4GB RAM 80GB+ free disk space for page file Virtual Memory set: 4000 - 6000 My questions Q1. Does this look like a memory issue and I am wrong that it is not? Q2. Does this point to exhaustion of free UOHs (as I'm thinking) and which is resulting in failure of creation of window handles? Q3. How can we avoid loading up of an StrategyEditor object (beyond a threshold, keeping an eye on the current usage of UOHs)? (we already know how to fetch number of UOHs in use, so don't go there.) Keep in mind that the call to new StrategyForm() is outside the control of my component. Q4. I am bit confused - what are Handles to user objects exactly? Is MSDN talking about any object that we create or only some specific objects like window handles, cursor handles, icon handles? Q5. What exactly cause to use up a UOH? (almost same as Q4) I would be really thankful to anyone who can give me some knowledgeable answers. Thanks much! :)

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  • [Flex 4 and .Net] Retrieving tables from SQL database

    - by mG
    Hi everyone, As the title says, I want to retrieve tables of data from a SQL database, using Flex 4 and .Net WebService. I'm new to both Flex and DotNet. Please tell me a proper way to do it. This is what I've done so far: Retrieving an array of string: (this works) .Net: [WebMethod] public String[] getTestArray() { String[] arStr = { "AAA", "BBB", "CCC", "DDD" }; return arStr; } Flex 4: <?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"> <fx:Script> <![CDATA[ import mx.collections.ArrayCollection; import mx.controls.Alert; import mx.rpc.events.ResultEvent; [Bindable] private var ac:ArrayCollection = new ArrayCollection(); protected function btn_clickHandler(event:MouseEvent):void { ws.getTestArray(); } protected function ws_resultHandler(event:ResultEvent):void { ac = event.result as ArrayCollection; Alert.show(ac.toString()); } ]]> </fx:Script> <fx:Declarations> <s:WebService id="ws" wsdl="http://localhost:50582/Service1.asmx?WSDL" result="ws_resultHandler(event)"/> </fx:Declarations> <s:Button x="10" y="30" label="Button" id="btn" click="btn_clickHandler(event)"/> </s:Application> Retrieving a DataTable: (this does not work) DotNet: [WebMethod] public DataTable getUsers() { DataTable dt = new DataTable("Users"); SqlConnection conn = new SqlConnection("server = 192.168.1.50; database = MyDatabase; user id = sa; password = 1234; integrated security = false"); SqlDataAdapter da = new SqlDataAdapter("select vFName, vLName, vEmail from Users", conn); da.Fill(dt); return dt; } Flex 4: <?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"> <fx:Script> <![CDATA[ import mx.collections.ArrayCollection; import mx.controls.Alert; import mx.rpc.events.ResultEvent; [Bindable] private var ac:ArrayCollection = new ArrayCollection(); protected function btn_clickHandler(event:MouseEvent):void { ws.getUsers(); } protected function ws_resultHandler(event:ResultEvent):void { ac = event.result as ArrayCollection; Alert.show(ac.toString()); } ]]> </fx:Script> <fx:Declarations> <s:WebService id="ws" wsdl="http://localhost:50582/Service1.asmx?WSDL" result="ws_resultHandler(event)"/> </fx:Declarations> <s:Button x="10" y="30" label="Button" id="btn" click="btn_clickHandler(event)"/> </s:Application>

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  • evaluating cost/benefits of using extension methods in C# => 3.0

    - by BillW
    Hi, In what circumstances (usage scenarios) would you choose to write an extension rather than sub-classing an object ? < full disclosure : I am not an MS employee; I do not know Mitsu Furota personally; I do know the author of the open-source Componax library mentioned here, but I have no business dealings with him whatsoever; I am not creating, or planning to create any commercial product using extensions : in sum : this post is from pure intellectal curiousity related to my trying to (continually) become aware of "best practices" I find the idea of extension methods "cool," and obviously you can do "far-out" things with them as in the many examples you can in Mitsu Furota's (MS) blog postslink text. A personal friend wrote the open-source Componax librarylink text, and there's some remarkable facilities in there; but he is in complete command of his small company with total control over code guidelines, and every line of code "passes through his hands." While this is speculation on my part : I think/guess other issues might come into play in a medium-to-large software team situation re use of Extensions. Looking at MS's guidelines at link text, you find : In general, you will probably be calling extension methods far more often than implementing your own. ... In general, we recommend that you implement extension methods sparingly and only when you have to. Whenever possible, client code that must extend an existing type should do so by creating a new type derived from the existing type. For more information, see Inheritance (C# Programming Guide). ... When the compiler encounters a method invocation, it first looks for a match in the type's instance methods. If no match is found, it will search for any extension methods that are defined for the type, and bind to the first extension method that it finds. And at Ms's link text : Extension methods present no specific security vulnerabilities. They can never be used to impersonate existing methods on a type, because all name collisions are resolved in favor of the instance or static method defined by the type itself. Extension methods cannot access any private data in the extended class. Factors that seem obvious to me would include : I assume you would not write an extension unless you expected it be used very generally and very frequently. On the other hand : couldn't you say the same thing about sub-classing ? Knowing we can compile them into a seperate dll, and add the compiled dll, and reference it, and then use the extensions : is "cool," but does that "balance out" the cost inherent in the compiler first having to check to see if instance methods are defined as described above. Or the cost, in case of a "name clash," of using the Static invocation methods to make sure your extension is invoked rather than the instance definition ? How frequent use of Extensions would affect run-time performance or memory use : I have no idea. So, I'd appreciate your thoughts, or knowing about how/when you do, or don't do, use Extensions, compared to sub-classing. thanks, Bill

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  • Problem with evaluating XPath expression in Java

    - by JSteve
    Can somebody help me find the mistake I am doing in evaluating following XPath expression? I want to get all "DataTable" nodes under the node "Model" in my xml through XPath. Here is my XML doc: <?xml version="1.0" encoding="UTF-8"?> <Root> <Application> <Model> <DataSet name="ds" primaryTable="Members" openRows="1"> <DataTable name="Members" openFor="write"> <DataColumn name="id" type="String" mandatory="true" primaryKey="true" valueBy="user"/> <DataColumn name="name" type="String" mandatory="true" valueBy="user"/> <DataColumn name="address" type="String" mandatory="false" valueBy="user"/> <DataColumn name="city" type="String" mandatory="false" valueBy="user"/> <DataColumn name="country" type="String" mandatory="false" valueBy="user"/> </DataTable> </DataSet> </Model> <View> <Composite> <Grid> <Label value="ID:" row="0" column="0" /> <Label value="Name:" row="1" column="0" /> <Label value="Address:" row="2" column="0" /> <Label value="City:" row="3" column="0" /> <Label value="Country:" row="4" column="0" /> <TextField name="txtId" row="0" column="1" /> <TextField name="txtName" row="1" column="1" /> <TextField name="txtAddress" row="2" column="1" /> <TextField name="txtCity" row="3" column="1" /> <TextField name="txtCountry" row="4" column="1" /> </Grid> </Composite> </View> </Application> </Root> Here the Java code to extract required node list: try { DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance(); domFactory.setNamespaceAware(true); domFactory.setIgnoringComments(true); domFactory.setIgnoringElementContentWhitespace(true); DocumentBuilder builder = domFactory.newDocumentBuilder(); Document dDoc = builder.parse("D:\TEST\myFile.xml"); XPath xpath = XPathFactory.newInstance().newXPath(); NodeList nl = (NodeList) xpath.evaluate("//Model//DataTable", dDoc, XPathConstants.NODESET); System.out.println(nl.getLength()); }catch (Exception ex) { System.out.println(ex.getMessage()); } There is no problem in loading and parsing xml file and I can see correct nodes in dDoc. Problem is with xpath that returns nothing on evaluating my expression. I tried many other expressions for testing purpose but every time resulting NodeList "nl" does not have any item

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  • Change ListView background - strage behaviour

    - by Beasly
    Hi again, I have a problem with changing the background of a view in a ListView. What I need: Change the background image of a row onClick() What actually happens: The background gets changed (selected) after pressing e.g. the first entry. But after scrolling down the 8th entry is selected too. Scroll back to the top the first isn't selected anymore. The second entry is selected now. Continue scrolling and it continues jumping... What i'm dong in the Code: I have channels, and onClick() I toggle an attribute of channel boolean selected and then I change the background. I'm doing this only onClick() thats why I don't get why it's actuelly happening on other entries too. One thing I notices is: It seems to be only the "drawing"-part because the item which get selected "by it self" has still the selected value on false I think it seems to have something to do with the reuse of the views in the custom ListAdapters getView(...) Code of onClick() in ListActivity: @Override protected ViewHolder createHolder(View v) { // createHolder will be called only as long, as the ListView is not // filled TextView title = (TextView) v .findViewById(R.id.tv_title_channel_list_adapter); TextView content = (TextView) v .findViewById(R.id.tv_content_channel_list_adapter); ImageView icon = (ImageView) v .findViewById(R.id.icon_channel_list_adapter); if (title == null || content == null || icon == null) { Log.e("ERROR on findViewById", "Couldn't find Title, Content or Icon"); } ViewHolder mvh = new MyViewHolder(title, content, icon); // We make the views become clickable // so, it is not necessary to use the android:clickable attribute in // XML v.setOnClickListener(new ChannelListAdapter.OnClickListener(mvh) { public void onClick(View v, ViewHolder viewHolder) { // we toggle the enabled state and also switch the the // background MyViewHolder mvh = (MyViewHolder) viewHolder; Channel ch = (Channel) mvh.data; ch.setSelected(!ch.getSelected()); // toggle if (ch.getSelected()) { v.setBackgroundResource(R.drawable.row_blue_selected); } else { v.setBackgroundResource(R.drawable.row_blue); } // TESTING Log.d("onClick() Channel", "onClick() Channel: " + ch.getTitle() + " selected: " + ch.getSelected()); } }); return mvh; } Code of getView(...): @Override public View getView(int position, View view, ViewGroup parent) { ViewHolder holder; // When view is not null, we can reuse it directly, there is no need // to reinflate it. // We only inflate a new View when the view supplied by ListView is // null. if (view == null) { view = mInflater.inflate(mViewId, null); // call own implementation holder = createHolder(view); // TEST // we set the holder as tag view.setTag(holder); } else { // get holder back...much faster than inflate holder = (ViewHolder) view.getTag(); } // we must update the object's reference holder.data = getItem(position); // call the own implementation bindHolder(holder); return view; } I really would appreciate any idea how to solve this! :) If more information is needed please tell me. Thanks in advance!

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  • What can I do to improve a project if there is a no-listening situation. Developers vs Management

    - by NazGul
    Hi all, I hope that I'm not the only one and I can get a answer from someone with more experience than me, so I can think cleaner and I don't get depressed with this developer's life. I'm working as developer for a small company three years now. In that three years I'm working in the same project and sincerely, I think this project could be used as a CASE STUDY because it has all the situations that cannot happen in a project and that makes a project fails. To begin with, and I believe you've already noticed, the project has 3 years already (develoment only) and is still unfinished, because in every meeting there is a "new priority" ,or a "new problem" to be solve or a "new feature" to be add. So, first problem is no target set. How can you know when something is finished if you don't know what you want? I understand Management, because they see an oportunity and try to get that, but I don't understand how can they not see (or hear us) that they'll lose all they already have and what they'll eventually get. Second, there is no team group. My team consists of three people, a Senior Developer, a DBA and, finally, I for all the work (support, testing, new features, bug fixing, meeting, projet management of clients, etc) aka Junior Developer. The first (senior developer), does not perform any tests on his changes, so, most of the time, his changes give us problems (us = me, since I'm the one who will fix it). The second (DBA) is an uncompromising person and you can not talk to him, believe me, I tried! In his view, everything he does is fantastic... even if it is the most complicated to make it... And he does everything he wants, even if we need that only for 5 months later and would help some extra-hand to do the things we have to do for now. As you can see, there is very hard to work with no help... Third, there is no testings. Every... I repeat, Every release of the project, the customers wants to kill us, because there is a lot of bugs. Management? They say that they want tests before the release. Us? We say the same. Time? No time. Management? There is always some time to open the application and click in some buttons. Us? Try to explain that it is not so simple. Management doesn't care... end of story. Actually, must of the bugs could be avoid with a rigorous work... Some people just want to do the show to the Management. "Did you ask for this? Cool, it's done. Bugs? The Do-all-the-work guy will solve." Unfortunally for me, sometimes the Do-all-the-work also has to finish it. And to makes this all better, I'm the person who will listen the complaints from the customers. Cool, huh? I know, everyone makes mistakes. But there is mistakes and mistakes... To complete, in the Management view, "the problem is the lack of an individual project management", because we cannot do all the stuff they ask, even if there is no PM for the project itself. And ask us to work overtime without any reward... I do say all this stuff to the management and others members, but by telling this, the I'm the bad guy, the guy who is complain when everything is going well... but we need to work overtime... sigh What can I do to make it works? Anyone has a situation like this, what did you do? I hope you could understand my problem, my English is a little rusty. Thanks.

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  • AES encryption/decryption java bouncy castle explanation?

    - by Programmer0
    Can someone please explain what this program is doing pointing out some of the major points? I'm looking at the code and I'm completely lost. I just need explanation on the encryption/decryption phases. I think it generates an AES 192 key at one point but I'm not 100% sure. I'm not sure what the byte/ivBytes are used for either. import java.security.Key; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.spec.IvParameterSpec; public class RandomKey { public static void main(String[] args) throws Exception { byte[] input = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 }; byte[] ivBytes = new byte[] { 0x00, 0x00, 0x00, 0x01, 0x04, 0x05, 0x06, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 }; //initializing a new initialization vector IvParameterSpec ivSpec = new IvParameterSpec(ivBytes); //what does this actually do? Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC"); //what does this do? KeyGenerator generator = KeyGenerator.getInstance("AES","BC"); //I assume this generates a key size of 192 bits generator.init(192); //does this generate a random key? Key encryptKey = generator.generateKey(); System.out.println("input: " +toHex(input)); //encryption phase cipher.init(Cipher.ENCRYPT_MODE, encryptKey, ivSpec); //what is this doing? byte[] cipherText = new byte[cipher.getOutputSize(input.length)]; //what is this doing? int ctLength = cipher.update(input, 0, input.length, cipherText,0); //getting the cipher text length i assume? ctLength += cipher.doFinal (cipherText, ctLength ); System.out.println ("Cipher: " +toHex(cipherText) + " bytes: " + ctLength); //decryption phase cipher.init(Cipher.DECRYPT_MODE, encryptKey, ivSpec); //storing the ciphertext in plaintext i'm assuming? byte[] plainText = new byte[cipher.getOutputSize(ctLength)]; int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0); //getting plaintextLength i think? ptLength= cipher.doFinal (plainText, ptLength); System.out.println("plain: " + toHex(plainText, ptLength)); } private static String digits = "0123456789abcdef"; public static String toHex(byte[] data, int length) { StringBuffer buf = new StringBuffer(); for (int i=0; i!= length; i++) { int v = data[i] & 0xff; buf.append(digits.charAt(v >>4)); buf.append(digits.charAt(v & 0xf)); } return buf.toString(); } public static String toHex(byte[] data) { return toHex(data, data.length); } }

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  • Entity Framework RC1 DbContext query issue

    - by Steve
    I'm trying to implement the repository pattern using entity framework code first rc 1. The problem I am running into is with creating the DbContext. I have an ioc container resolving the IRepository and it has a contextprovider which just news up a new DbContext with a connection string in a windsor.config file. With linq2sql this part was no problem but EF seems to be choking. I'll describe the problem below with an example. I've pulled out the code to simplify things a bit so that is why you don't see any repository pattern stuff here. just sorta what is happening without all the extra code and classes. using (var context = new PlssContext()) { var x = context.Set<User>(); var y = x.Where(u => u.UserName == LogOnModel.UserName).FirstOrDefault(); } using (var context2 = new DbContext(@"Data Source=.\SQLEXPRESS;Initial Catalog=PLSS.Models.PlssContext;Integrated Security=True;MultipleActiveResultSets=True")) { var x = context2.Set<User>(); var y = x.Where(u => u.UserName == LogOnModel.UserName).FirstOrDefault(); } PlssContext is where I am creating my DbContext class. The repository pattern doesn't know anything about PlssContext. The best I thought I could do was create a DbContext with the connection string to the sqlexpress database and query the data that way. The connection string in the var context2 was grabbed from the context after newing up the PlssContext object. So they are pointing at the same sqlexpress database. The first query works. The second query fails miserably with this error: The model backing the 'DbContext' context has changed since the database was created. Either manually delete/update the database, or call Database.SetInitializer with an IDatabaseInitializer instance. For example, the DropCreateDatabaseIfModelChanges strategy will automatically delete and recreate the database, and optionally seed it with new data. on this line var y = x.Where(u => u.UserName == LogOnModel.UserName).FirstOrDefault(); Here is my DbContext namespace PLSS.Models { public class PlssContext : DbContext { public DbSet<User> Users { get; set; } public DbSet<Corner> Corners { get; set; } public DbSet<Lookup_County> Lookup_County { get; set; } public DbSet<Lookup_Accuracy> Lookup_Accuracy { get; set; } public DbSet<Lookup_MonumentStatus> Lookup_MonumentStatus { get; set; } public DbSet<Lookup_CoordinateSystem> Lookup_CoordinateSystem { get; set; } public class Initializer : DropCreateDatabaseAlways<PlssContext> { protected override void Seed(PlssContext context) { I've tried all of the Initializer strategies with the same errors. I don't think the database is changing. If I remove the modelBuilder.Conventions.Remove<IncludeMetadataConvention>(); Then the error returns is The entity type User is not part of the model for the current context. Which sort of makes sense. But how do you bring this all together?

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  • Yet another bug of JSF?

    - by Nitesh Panchal
    Hello, Again i see that the @PostConstruct is firing every time even though no binding attribute is used. See this code :- <?xml version='1.0' encoding='UTF-8' ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:c="http://java.sun.com/jsp/jstl/core"> <h:head> <title>Facelet Title</title> </h:head> <h:body> <h:form> <c:forEach var="item" items="#{TestBean.listItems}"> <h:outputText value="#{item}"/> </c:forEach> <h:commandButton value="Click" actionListener="#{TestBean.actionListener}"/> </h:form> </h:body> </html> And this is the simplest possible bean in JSF :- package managedBeans; import java.io.Serializable; import java.util.ArrayList; import java.util.List; import javax.annotation.PostConstruct; import javax.faces.bean.ManagedBean; import javax.faces.bean.ViewScoped; @ManagedBean(name="TestBean") @ViewScoped public class TestBean implements Serializable { private List<String> listItems; public List<String> getListItems() { return listItems; } public void setListItems(List<String> listItems) { this.listItems = listItems; } public TestBean() { } @PostConstruct public void init(){ System.out.println("Post Construct fired!"); listItems = new ArrayList<String>(); listItems.add("Mango"); listItems.add("Apple"); listItems.add("Banana"); } public void actionListener(){ System.out.println("Action Listener fired!"); } } Do you see any behaviour that should cause postconstruct callback to fire each time? I think JSF 2.0 is highly unstable. If it has to fire PostConstruct each and every time what purpose does @ViewScoped serve. Why not to use @RequestScoped only? I thought i have made some mistake in my application. But when i created this simplest possible in JSF, i still get this error. Am i not understanding the scopes of JSF? or are they not testing it properly? Further, if you remove c:forEach and replace it with ui:repeat, then it works fine. Waiting for replies to confirm whether it is bug or it is intentional to stop the programmers from using jstl?

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  • How can I tell the size of my app during development?

    - by Newbyman
    My programming decissions are directly related to how much room I have left, or worse perhaps how much I need to shave off in order to get up the 10mb limit. I have read that Apple has quietly increased the 3G & Edge download limit from 10mb up to 20mb in preparation for the iPad in April. Either way, my real question is how can I gauge a rough estimate of how large my app will end while I'm still in the development phase? Is the file size of my development folder roughly 1 to 1 ratio? Is the compressed file size of my development a better approximation? My .xcodeproj file is only a couple hundred kB, but the size of my folder is 11.8 MB. I have a .sqlite database, less than 20 small png images and a Settings.Bundle. The rest are unknown Xcode files related to build, build for iphoneOS, simulator etc.... My source code is rather large with around 1000 lines in most of the major controllers, all in all around 48 .h&.m files. But my classes folder inside my development folder is less than 800kb. Digging around inside my Build file, there is lots of iphone simulator files and debugging files which I don't think will contribute to the final product. The Application file states that it is around 2.3 MB. However, this is such a large difference from the 11.8 MB, I have to wonder if this is just another piece of the equation. I have the app on the my device, I'm in the testing phase. Therefore, I though that I would try to see how large the working version was on the device by checking in iTunes, however my development app is visible on the right-hand the application's iphone screen, but no information about the app most importantly its size. I also checked in Organizer, I used the lower portion of the screen-(Applications), found my application and selected the drop down arrow which gave my "Application Data" and a download arrow button to the right to save a file on my desktop, named with the unique AppleID. Inside the folder it had three folders-(documents, library, tmp) the documents had a copy of my .sqlite database, the library a few more files but not anything obvious or of size, and the tmp was empty. All in all the entire folder was only 164kb-which tells me that this is not the right place to find the size either. I understand that the size is considered to be the size of my binary plus all the additional files and images that I have add. Does anyone have a effective way of guaging how large the binary is or the relating the development folder size to what the final App Store application size will end up. I know that questions have been posted with similar aspects, but I could not find any answered post that really described...what files, or how to determine size specifically. I know that this question looks like a book, but I just wanted to be specific in conveying exactly what I'm looking for and the attempts thus far. *Note all files are unzipped and still in regular working Xcode order of a single app with no brought-in builds or referenced projects. I'm sure that this is straight forward, I just don't know where to look?

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  • RSA encryption/ Decryption in a client server application

    - by user308806
    Hi guys, probably missing something very straight forward on this, but please forgive me, I'm very naive! Have a client server application where the client identifies its self with an RSA encrypted username & password. Unfortunately I'm getting a "bad padding exception: data must start with zero" when i try to decrypt with the public key on the client side. I'm fairly sure the key is correct as I have tested encrypting with public key then decrypting with private key on the client side with no problems at all. Just seems when I transfer it over the connection it messses it up somehow?! Using PrintWriter & BufferedReader on the sockets if thats of importance. EncodeBASE64 & DecodeBASE64 encode byte[] to 64base and vice versa respectively. Any ideas guys?? Client side: Socket connectionToServer = new Socket("127.0.0.1", 7050); InputStream in = connectionToServer.getInputStream(); DataInputStream dis = new DataInputStream(in); int length = dis.readInt(); byte[] data = new byte[length]; // dis.readFully(data); dis.read(data); System.out.println("The received Data*****************************************"); System.out.println("The length of bits "+ length); System.out.println(data); System.out.println("***********************************************************"); Decryption d = new Decryption(); byte [] ttt = d.decrypt(data); System.out.print(data); String ss = new String(ttt); System.out.println("***********************"); System.out.println(ss); System.out.println("************************"); Server Side: in = connectionFromClient.getInputStream(); OutputStream out = connectionFromClient.getOutputStream(); DataOutputStream dataOut = new DataOutputStream(out); LicenseList licenses = new LicenseList(); String ValidIDs = licenses.getAllIDs(); System.out.println(ValidIDs); Encryption enc = new Encryption(); byte[] encrypted = enc.encrypt(ValidIDs); byte[] dd = enc.encrypt(ValidIDs); String tobesent = new String(dd); //byte[] rsult = enc.decrypt(dd); //String tt = String(rsult); System.out.println("The sent data**********************************************"); System.out.println(dd); String temp = new String(dd); System.out.println(temp); System.out.println("*************************************************************"); //BufferedWriter bf = new BufferedWriter(OutputStreamWriter(out)); //dataOut.write(ValidIDs.getBytes().length); dataOut.writeInt(ValidIDs.getBytes().length); dataOut.flush(); dataOut.write(encrypted); dataOut.flush(); System.out.println("********Testing**************"); System.out.println("Here are the ids:::"); System.out.println(licenses.getAllIDs()); System.out.println("**********************"); //bw.write("it is working well\n");

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  • MVC using ODP.NET getting ORA-01840

    - by sse
    I am writing a simple MVC Application using ODP.NET. I am trying to call a Pl/Sql proc that inserts a record. Here is the simple Pl/Sql: procedure spAddCountry(pGisRecid in country.GISRECID%type, pCountryCode in country.COUNTRYCODE%type, pCountryName in country.COUNTRYNAME%type, pCurrencyCode in country.CURRENCYCODE%type, pEUTerritory in country.EUTERRITORY%type, pFatCAStatus in country.FATCASTATUS%type, pFATF in country.FATF%type, pFSCountryCode in country.COUNTRYCODE%type, pInsertedBy in country.INSERTEDBY%type, pInsertedOn in country.INSERTEDON%type, pLanguages in country.LANGUAGES%type, pNCCT in country.NCCT%type) is PRAGMA AUTONOMOUS_TRANSACTION; begin INSERT INTO COUNTRY (GISRECID, COUNTRYCODE, COUNTRYNAME, CURRENCYCODE, EUTERRITORY, FATCASTATUS, FATF, FSCOUNTRYCODE, INSERTEDBY, INSERTEDON, LANGUAGES, NCCT) VALUES(pGISRECID, pCOUNTRYCODE, pCOUNTRYNAME, pCURRENCYCODE, pEUTERRITORY, pFATCASTATUS, pFATF, pFSCOUNTRYCODE, pINSERTEDBY, pINSERTEDON, pLANGUAGES, pNCCT); Commit; end; I am having difficulty passing the date parameter, pInsertedOn, to the Stored Proc. I have verified that the web form retrieves the form data successfully and calls the AddCountry method below, which in turns calls the stored proc, spAddCountry, after populating all of the parms. Here is a snippet of the MVC C# code. I get the following exception: "ORA-01840 input value not long enough for date format". public void AddCountry(Country aCountry) //because the country object field names match the form field names they automatically get bound!! { string oradb = "Data Source=XYZ;User Id=XYZ;Password=xyz;"; OracleConnection conn = new OracleConnection(oradb); OracleCommand cmd = conn.CreateCommand(); cmd.CommandText = "tstpack.spAddCountry"; cmd.CommandType = CommandType.StoredProcedure; ... OracleParameter paramInsertedBy = new OracleParameter(); paramInsertedBy.ParameterName = "pInsertedBy"; paramInsertedBy.Value = aCountry.InsertedBy; cmd.Parameters.Add(paramInsertedBy); // CultureInfo ci = new CultureInfo("en-US"); OracleParameter paramInsertedOn = new OracleParameter(); paramInsertedOn.ParameterName = "pInsertedOn"; // paramInsertedOn.Value = DateTime.Now; //just testing to see if it's WebForm issue // paramInsertedOn.Value = Convert.ToDateTime(DateTime.Now.ToString(), ci); //flail! paramInsertedOn.Value = aCountry.InsertedOn; cmd.Parameters.Add(paramInsertedOn); ... conn.Open(); cmd.ExecuteNonQuery(); //CRASH! ORA-01840 conn.Close(); } Just to verify that the flow of the program is working, I tried removing the date parm "pInsertedOn" from the pl/sql and from the parm list above, and everything worked fine. I know I am going off of the rails with the date. Can someone tell me how to pass a date to Oracle from an MVC WebForm? Is there some sort of type cast needed? I would really appreciate an example too. Thanks so much! ps, I did try changing the parm type to Varchar2 in the Pl/Sql and doing some conversions myself in the Pl/Sql, the automatic MVC binder was getting in my way, forcing the property of paramInsertedOn.OracleType to DateTime. I tried forcing it to Varchar2, but no luck there either...

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  • JPA @Version behaviour

    - by Albert Kam
    Hello, im using JPA2 with Hibernate 3.6.x I have made a simple testing on the @Version. Let's say we have 2 entities, Entity Team has a List of Player Entities, bidirectional relationship, lazy fetchtype, cascade-type All Both entities have @Version And here are the scenarios : Whenever a modification is made to one of the team/player entity, the team/player's version will be increased when flushed/commited (version on the modified record is increased). Adding a new player entity to team's collection using persist, the entity the team's version will be assigned after persist (adding a new entity, that new entity will got it's version). Whenever an addition/modification/removal is made to one of the player entity, the team's version will be increased when flushed/commited. (add/modify/remove child record, parent's version got increased also) I can understand the number 1 and 2, but the number 3, i dont understand, why the team's version got increased ? And that makes me think of other questions : What if i got Parent <- child <- granchildren relation ship. Will an addition or modification on the grandchildren increase the version of child and parent ? In scenario number 2, how can i get the version on the team before it's commited, like perhaps by using flush ? Is it a recommended way to get the parent's version after we do something to the child[s] ? Here's a code sample from my experiment, proving that when ReceivingGoodDetail is the owning side, and the version got increased in the ReceivingGood after flushing. Sorry that this use other entities, but ReceivingGood is like the Team, ReceivingGoodDetail is like the Player. 1 ReceivingGood/Team, many ReceivingGoodDetail/Player. /* Hibernate: select receivingg0_.id as id9_14_, receivingg0_.creationDate as creation2_9_14_, .. too long Hibernate: select product0_.id as id0_4_, product0_.creationDate as creation2_0_4_, .. too long before persisting the new detail, version of header is : 14 persisting the detail 1c9f81e1-8a49-4189-83f5-4484508e71a7 printing the size of the header : Hibernate: select details0_.receivinggood_id as receivi13_9_8_, details0_.id as id8_, details0_.id as id10_7_, .. too long 7 after persisting the new detail, version of header is : 14 Hibernate: insert into ReceivingGoodDetail (creationDate, modificationDate, usercreate_id, usermodify_id, version, buyQuantity, buyUnit, internalQuantity, internalUnit, product_id, receivinggood_id, supplierLotNumber, id) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) Hibernate: update ReceivingGood set creationDate=?, modificationDate=?, usercreate_id=?, usermodify_id=?, version=?, purchaseorder_id=?, supplier_id=?, transactionDate=?, transactionNumber=?, transactionType=?, transactionYearMonth=?, warehouse_id=? where id=? and version=? after flushing, version of header is now : 15 */ public void addDetailWithoutTouchingCollection() { String headerId = "3b373f6a-9cd1-4c9c-9d46-240de37f6b0f"; ReceivingGood receivingGood = em.find(ReceivingGood.class, headerId); // create a new detail ReceivingGoodDetail receivingGoodDetailCumi = new ReceivingGoodDetail(); receivingGoodDetailCumi.setBuyUnit("Drum"); receivingGoodDetailCumi.setBuyQuantity(1L); receivingGoodDetailCumi.setInternalUnit("Liter"); receivingGoodDetailCumi.setInternalQuantity(10L); receivingGoodDetailCumi.setProduct(getProduct("b3e83b2c-d27b-4572-bf8d-ac32f6de5eaa")); receivingGoodDetailCumi.setSupplierLotNumber("Supplier Lot 1"); decorateEntity(receivingGoodDetailCumi, getUser("3978fee3-9690-4377-84bd-9fb05928a6fc")); receivingGoodDetailCumi.setReceivingGood(receivingGood); System.out.println("before persisting the new detail, version of header is : " + receivingGood.getVersion()); // persist it System.out.println("persisting the detail " + receivingGoodDetailCumi.getId()); em.persist(receivingGoodDetailCumi); System.out.println("printing the size of the header : "); System.out.println(receivingGood.getDetails().size()); System.out.println("after persisting the new detail, version of header is : " + receivingGood.getVersion()); em.flush(); System.out.println("after flushing, version of header is now : " + receivingGood.getVersion()); }

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  • How to design a high-level application protocol for metadata syncing between devices and server?

    - by Jaanus
    I am looking for guidance on how to best think about designing a high-level application protocol to sync metadata between end-user devices and a server. My goal: the user can interact with the application data on any device, or on the web. The purpose of this protocol is to communicate changes made on one endpoint to other endpoints through the server, and ensure all devices maintain a consistent picture of the application data. If user makes changes on one device or on the web, the protocol will push data to the central repository, from where other devices can pull it. Some other design thoughts: I call it "metadata syncing" because the payloads will be quite small, in the form of object IDs and small metadata about those ID-s. When client endpoints retrieve new metadata over this protocol, they will fetch actual object data from an external source based on this metadata. Fetching the "real" object data is out of scope, I'm only talking about metadata syncing here. Using HTTP for transport and JSON for payload container. The question is basically about how to best design the JSON payload schema. I want this to be easy to implement and maintain on the web and across desktop and mobile devices. The best approach feels to be simple timer- or event-based HTTP request/response without any persistent channels. Also, you should not have a PhD to read it, and I want my spec to fit on 2 pages, not 200. Authentication and security are out of scope for this question: assume that the requests are secure and authenticated. The goal is eventual consistency of data on devices, it is not entirely realtime. For example, user can make changes on one device while being offline. When going online again, user would perform "sync" operation to push local changes and retrieve remote changes. Having said that, the protocol should support both of these modes of operation: Starting from scratch on a device, should be able to pull the whole metadata picture "sync as you go". When looking at the data on two devices side by side and making changes, should be easy to push those changes as short individual messages which the other device can receive near-realtime (subject to when it decides to contact server for sync). As a concrete example, you can think of Dropbox (it is not what I'm working on, but it helps to understand the model): on a range of devices, the user can manage a files and folders—move them around, create new ones, remove old ones etc. And in my context the "metadata" would be the file and folder structure, but not the actual file contents. And metadata fields would be something like file/folder name and time of modification (all devices should see the same time of modification). Another example is IMAP. I have not read the protocol, but my goals (minus actual message bodies) are the same. Feels like there are two grand approaches how this is done: transactional messages. Each change in the system is expressed as delta and endpoints communicate with those deltas. Example: DVCS changesets. REST: communicating the object graph as a whole or in part, without worrying so much about the individual atomic changes. What I would like in the answers: Is there anything important I left out above? Constraints, goals? What is some good background reading on this? (I realize this is what many computer science courses talk about at great length and detail... I am hoping to short-circuit it by looking at some crash course or nuggets.) What are some good examples of such protocols that I could model after, or even use out of box? (I mention Dropbox and IMAP above... I should probably read the IMAP RFC.)

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  • How to close a JFrame in the middle of a program

    - by Nick Gibson
    public class JFrameWithPanel extends JFrame implements ActionListener, ItemListener { int packageIndex; double price; double[] prices = {49.99, 39.99, 34.99, 99.99}; DecimalFormat money = new DecimalFormat("$0.00"); JLabel priceLabel = new JLabel("Total Price: "+price); JButton button = new JButton("Check Price"); JComboBox packageChoice = new JComboBox(); JPanel pane = new JPanel(); TextField text = new TextField(5); JButton accept = new JButton("Accept"); JButton decline = new JButton("Decline"); JCheckBox serviceTerms = new JCheckBox("I Agree to the Terms of Service.", false); JTextArea termsOfService = new JTextArea("This is a text area", 5, 10); public JFrameWithPanel() { super("JFrame with Panel"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); pane.add(packageChoice); setContentPane(pane); setSize(250,250); setVisible(true); packageChoice.addItem("A+ Certification"); packageChoice.addItem("Network+ Certification "); packageChoice.addItem("Security+ Certifictation"); packageChoice.addItem("CIT Full Test Package"); pane.add(button); button.addActionListener(this); pane.add(text); text.setEditable(false); text.setBackground(Color.WHITE); text.addActionListener(this); pane.add(termsOfService); termsOfService.setEditable(false); termsOfService.setBackground(Color.lightGray); pane.add(serviceTerms); serviceTerms.addItemListener(this); pane.add(accept); accept.addActionListener(this); pane.add(decline); decline.addActionListener(this); } public void actionPerformed(ActionEvent e) { packageIndex = packageChoice.getSelectedIndex(); price = prices[packageIndex]; text.setText("$"+price); Object source = e.getSource(); if(source == accept) { if(serviceTerms.isSelected() == false) { JOptionPane.showMessageDialog(null,"Please accept the terms of service.", "Terms of Service", JOptionPane.ERROR_MESSAGE); } else { JOptionPane.showMessageDialog(null,"Thank you. We will now move on to registering your product."); pane.dispose(); } } else if(source == decline) { System.exit(0); } } public void itemStateChanged(ItemEvent e) { int select = e.getStateChange(); } public static void main(String[] args) { String value1; int constant = 1, invalidNum = 0, answerParse, packNum, packPrice; JOptionPane.showMessageDialog(null,"Hello!"+"\nWelcome to the CIT Test Program."); JOptionPane.showMessageDialog(null,"IT WORKS!"); } }//class How do I get this frame to close so that my JOptionPane Message Dialogs can continue in the program without me exiting the program completely. EDIT: I tried .dispose() but I get this: cannot find symbol symbol : method dispose() location: class javax.swing.JPanel pane.dispose(); ^

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  • html button elemenents and onserverclick attribute in asp.net

    - by Adrian Adkison
    I have been experiencing some very strange behavior using html buttons with the onserverclick attribute. What I am trying to do is use jQuery to designate the default button on the page. By default button I mean the button that is "clicked" when a user hits enter. In testing, I would hit enter while in an input field and sometimes the intended "default" button was clicked and the server side method defined in the corresponding onserverclick attribute was hit. Other times a post back was made without hitting the server method. In order to isolate the issue I created a minimal test case and found some very interesting results. client side: <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>Untitled Page</title> <script type="text/javascript" src="/scripts/jquery-1.4.min.js"></script> </head> <body> <form id="form1" runat="server"> <asp:Label ID="_response" runat="server"></asp:Label> <input id="input1" type="text" /> <input id="input2" type="text" /> <button id="first" type="button" class="defaultBtn" runat="server" onserverclick="ServerMethod1">test1</button> <button id="second" type="button" runat="server" onserverclick="ServerMethod2">test2</button> </form> <script type="text/javascript"> jQuery('form input').keyup( function(e) { if ((e.which && e.which == 13) || (e.keyCode && e.keyCode == 13)) { $('button.defaultBtn').click(); return true; } } ); </script> </body> </html> server side: public partial class admin_spikes_ButtonSubmitTest : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void ServerMethod1(object sender, EventArgs e) { _response.Text = "server method1 was hit"; } protected void ServerMethod2(object sender, EventArgs e) { _response.Text = "server method2 was hit"; } } What I found was that everything worked as expected with this code except when I removed one of the input elements. In Firefox 3.6 and IE 8 when only one input exists on the page, hitting enter does not trigger the onserverclick, it makes a post back without even being jQuery "clicked" or actually "clicked". You can test this by starting with two inputs and clicking "test2". This will output "server method2 was hit". Then just hit enter and the output will be "server method1 was hit. Now take away an input and run the same test. Click "test2" see the results, then hit enter and you will see that nothing will change because the "test1" method was never hit. Does anyone know what is going on? Thanks p.s. Chrome worked as expected

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  • Php template caching design

    - by Thomas
    Hello to all, I want to include caching in my app design. Caching templates for starters. The design I have used so far is very modular. I have created an ORM implementation for all my tables and each table is represented by the corresponding class. All the requests are handled by one controller which routes them to the appropriate webmethod functions. I am using a template class for handling UI parts. What I have in mind for caching includes the implementation of a separate Cache class for handling caching with the flexibility to either store in files, apc or memcache. Right now I am testing with file caching. Some thoughts Should I include the logic of checking for cached versions in the Template class or in the webmethods which handle the incoming requests and which eventually call the Template class. In the first case, things are pretty simple as I will not have to change anything more than pass the template class an extra argument (whether to load from cache or not). In the second case however, I am thinking of checking for a cached version immediately in the webmethod and if found return it. This will save all the processing done until the logic reaches the template (first case senario). Both senarios however, rely on an accurate mechanism of invalidating caches, which brings as to Invalidating caches As I see it (and you can add your input freely) a template cached file, becomes invalidate if: a. the expiration set, is reached. b. the template file itself is updated (ie by the developer when adding a new line) c. the webmethod that handles the request changes (ie the developer adds/deletes something in the code) d. content coming from the db and ending in the template file is modified I am thinking of storing a json encoded array inside the cached file. The first value will be the expiration timestamp of the cache. The second value will be the modification time of the php file with the code handling the request (to cope with option c above) The third will be the content itself The validation process I am considering, according to the above senarios, is: a. If the expiration of the cached file (stored in the array) is reached, delete the cache file b. if the cached file's mod time is smaller than the template's skeleton file mod time, delete the cached file c. if the mod time of the php file is greated than the one stored in the cache, delete the cached file. d. This is tricky. In the ORM implementation I ahve added event handlers (which fire when adding, updating, deleting objects). I could delete the cache file every time an object thatprovides content to the template, is modified. The problem is how to keep track which cached files correpond to each schema object. Take this example, a user has his shortprofile page and a full profile page (2 templates) These templates can be cached. Now, every time the user modifies his profile, the event handler would need to know which templates or cached files correspond to the User, so that these files can be deleted. I could store them in the db but I am looking for a beter approach

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