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  • What are modern and old compilers written in?

    - by ulum
    As a compiler, other than an interpreter, only needs to translate the input and not run it the performance of itself should be not that problematic as with an interpreter. Therefore, you wouldn't write an interpreter in, let's say Ruby or PHP because it would be far too slow. However, what about compilers? If you would write a compiler in a scripting language maybe even featuring rapid development you could possibly cut the source code and initial development time by halv, at least I think so. To be sure: With scripting language I mean interpreted languages having typical features that make programming faster, easier and more enjoyable for the programmer, usually at least. Examples: PHP, Ruby, Python, maybe JavaScript though that may be an odd choice for a compiler What are compilers normally written in? As I suppose you will respond with something low-level like C, C++ or even Assembler, why? Are there compilers written in scripting languages? What are the (dis)advantages of using low or high level programming languages for compiler writing?

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  • Firebug not breaking on errors

    - by stormdrain
    Hi. I reinstalled Firefox today, because... whatever. I reinstalled firebug, therefully, and now when I try to use it, it's all different. I believe it is the same version I had before. In fact, I even went digging through my trash and replaced the new firebug with the one I removed with the old Firefox. They ended up being the same version (1.5.3). My issue is, when I have an error in my script somewhere, it used to be that if on the script pane of firebug, the script would break on the error, and the script page would go to the offending line, highlighted, and all was right with the world. Now, it logs the error in the console, and that's it. I've spent the better part of the last hour trying to convince myself this isn't worth an ulcer; I am losing the battle, though. I've searched Google, put ads on Craigslist, even thought about becoming a cop. There were some examples on the Firebug dox, but none of them helped. A bunch of old references to a mysterious (break on all errors) option; an option which I think I might have set by accident--there is a little red circle-slash on my pause button (that's what she said), but there the script continues, all on its own. There was a guide somewhere on the firebug pages that spoke of setting the breakpoint next to the error in the console. I, however, don't have this option for some reason. The line of code is there in the console, but no breakpoint button next to it. This, however, would not be ideal even if it worked. I liked it when I could have the script page open, and if there were errors it would jump to that line. I could try to fix it, and re-load the page. If that line was fixed, GREAT, on to the next error on the page -- which would be highlighted and ready. I would like to offer a solicitation of help. Help.

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  • DRM for videos bundled with a desktop app?

    - by onekidney
    Hey everybody, So, I have this desktop app built using WPF and C#. It's basically an offline course system that has videos, quizzes, and other assorted content. My dilemma is that I don't know how to protect the videos once they are downloaded and installed on the users machine? Are there any DRM systems out there that I can look into? I thought about storing them in a local encrypted database but I don't even know where to start with that (or if there is something else out there that I'm totally missing...) Don't even know where to start looking on this one - any ideas?

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  • Why is my Tomcat 6 executor thread pool not being used by the connector?

    - by jwegan
    My server.xml looks like the following: <!--The connectors can use a shared executor, you can define one or more named thread pools--> <Executor name="tomcatThreadPool" namePrefix="catalina-exec-" maxThreads="200" minSpareThreads="4"/> <Connector executor="tomcatThreadPool" port="8080" protocol="HTTP/1.1" connectionTimeout="10000" maxKeepAliveRequests="1" redirectPort="8443" /> <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" /> However, in the Tomcat manager (http://localhost/manager/status) it shows to following http-8080: Max threads: -1 Current thread count: -1 Current thread busy: -1 jk-8009: Max threads: 200 Current thread count: 4 Current thread busy: 1 For some reason it looks like http-8080 isn't using the executor even though it is directed too and jk-8009 is using the executor even though it isn't instructed to. Is the manager just misreporting or have I not setup the thread pool correctly?

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  • Memory leak in xbap application

    - by Arvind
    Hi, We are using many custom controls by inheriting form the WPFcontrols as the base and customizing it for our need. However, the memory used by these controls are not released, even after pages using the controls are closed, until the whole application is closed. As these application has to work for a whole day performance decreases as more and more memory gets held up. When we profiled our page we found that the controls where not getting collected as there where some binding reference or some borders or brushes etc not getting cleared from that control. We tried to use the Unload event of the controls to remove the events and some references from the control. This reduced the leak to some extent but this was slowing down closing of the page also the unload event was getting triggered when the control was even collapsed. Is there any other ways to overcome the leak? Are there any best practices to prevent memory leaks? Thanks Arvind

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  • 24 hours per day and freelance programming jobs

    - by Luca
    I'm working on stimulanting projects at my job. I like it. I like programming! I have accumulated several years of experience now. Sometime happens I develop other projects (even more stimulant of my main job). Some more money cannot hurts! The problem is that my free time has decreased a lot, leading me to develop until late evening. I usually program each day (I like to develop my own projects, even if only a few lines at a time). But it is one thing to plan for my pleasure, it is one thing to plan for business. So, my question is how to balance free time with these additional jobs? What experiences do you have? How much you can develop for long time (in a medium interval, say, weeks)? Every thought is welcome!

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  • Bug Running Android Tutorial HelloTabWidget under SDK 1.5: "setCurrentTag(getIntent())"

    - by Matt J.
    does not compile. Indeed: even in 1.5, this api, getIntent(), is already listed as deprecated. The error message I get complains that getIntent() does not return a String, but setCurrentTab() expects a string. If I guess and change the line to read: "tabHost.setCurrentTab(1); // was setCurrentTab(getIntent())", then it compiles, builds, but does not run. I get the "stopped unexpectedly" error message from the emulator. I cannot even get Log.d to output, so it seems that it stops 'unexpectedly' very early. So the first and main question is: what is the correct fix to "tabHost.setCurrentTab(getIntent())" in the final line of OnCreate() in http://developer.android.com/resources/tutorials/views/hello-tabwidget.html? The second and simpler question is: did I guess right in replacing 'mTabHost' with tabHost in the one place where that occurs?

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  • Tool to aid Code Review

    - by Prakash
    For our small team of 20 developers, we used do code review like: Make a label in svn and publish the label to the reviewers Reviewers checkout the code and add comments in line (with marker like: // REVIEWER_NAME::REVIEW COMMENT:) After all comments are in, reviewer checks in the code, preferably with new label. Developer checks the comments and makes changes (if appropriate) Developer keeps an excel sheet report for considered changes and reasons for ignored comments Problem: Developer needs to keep track of multiple labels which might have same comments Sometimes we even do One on One review and if we really have time, even do Table review (team of reviewers looks at the code on projector, on the fly, and pass comment) I was wondering: Are you guys using any specific tool which helps to do code reviews smoother? I have heard of Code Collaborator. But have anyone used that? Is it worth the money?

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  • How to detect non-graceful disconnect of Twisted on Linux?

    - by Victor Lin
    I wrote a server based on Twisted, and I encountered a problem, some of the clients are disconnected not gracefully. For example, the user pulls out the network cable. For a while, the client on Windows is disconnected (the connectionLost is called, and it is also written in Twisted). And on the Linux server side, my connectionLost of twisted is never triggered. Even it try to writes data to client, but the connection is lost. Why Twisted can't detect those non-graceful disconnection (even write data to client) on Linux? How to makes Twisted detect non-graceful disconnections? Because the feature Twisted can't detect non-graceful, I have lots of zombie user on my server. Thanks. Victor Lin.

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  • BroadCast Messages to multiple client on the same machine

    - by Christopher Chase
    I need to have a server on one machine that broadcasts a message sever second or so, Kind of like a service discovery. The message needs to be received by multiple client processes that could be on the same machine or different machines. Im using delphi7, with indy 9.0.18 where im stuck is if i should be using UDP or IP MultiCast or if its even possible... Ive managed to get it to work with IP Multi Cast with one client per machine, but even after many trys with different bindings.. max/min ports etc, i cant seem to find a solution.

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  • MathML or OMML to PNG w/ .NET?

    - by charliedigital
    Are there any libraries which take MathML (or, even more preferably, OMML) and outputs a .PNG file? I am putting together an export process for .docx files and, as a part of this process, I'd like to extract equations and render them as .PNG files. Word 2007 does this natively when you save a document for the web, but so far, I have not been able to find a way to do this programmatically (if anyone has an answer for that, it would be even better). So the next best thing is to take the OMML and use the Microsoft provided XSL stylesheets and transform them to MathML. Unfortunately, I haven't been able to find any (working) rendering libraries for either MathML or OMML. If there aren't any pure .NET libraries for this, I'll settle for just about anything that I can call from a commandline to output a .PNG from either MathML or OMML.

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  • Path for Delphi libraries

    - by Wouter van Nifterick
    Where do you guys store 3rd party (and your own) components? Do you keep separate copies per Delphi version? For years I've been using c:\program files\borland\delphi7\lib\, even for Delphi 2006, 2007, 2009 and 2010, like this: c:\program files\borland\delphi7\lib\AggPas\ c:\program files\borland\delphi7\lib\DeHL\ c:\program files\borland\delphi7\lib\DevExpress\ c:\program files\borland\delphi7\lib\FastCode\ c:\program files\borland\delphi7\lib\FastMM\ c:\program files\borland\delphi7\lib\Fundamentals\ c:\program files\borland\delphi7\lib\Graphics32\ c:\program files\borland\delphi7\lib\JCL\ c:\program files\borland\delphi7\lib\JVCL\ c:\program files\borland\delphi7\lib\OmniThread\ c:\program files\borland\delphi7\lib\Raize\ c:\program files\borland\delphi7\lib\TeeChartPro\ c:\program files\borland\delphi7\lib\TurboPower\ c:\program files\borland\delphi7\lib\VirtualTreeView\ c:\program files\borland\delphi7\lib\Zeos\ However, nowadays I don't even use Delphi7 anymore (what can it do that 2010 can't?), so this path doesn't make much sense anymore. I'm about to install windows7 on my home machine, so I'm thinking on something like this: c:\src\DelphiLib\ Any better ideas?

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  • Java webapp: adding a content-disposition header to force browsers "save as" behavior

    - by WizardOfOdds
    Even though it's not part of HTTP 1.1/RFC2616 webapps that wish to force a resource to be downloaded (rather than displayed) in a browser can use the Content-Disposition header like this: Content-Disposition: attachment; filename=FILENAME Even tough it's only defined in RFC2183 and not part of HTTP 1.1 it works in most web browsers as wanted. So from the client side, everything is good enough. However on the server-side, in my case, I've got a Java webapp and I don't know how I'm supposed to set that header, especially in the following case... I'll have a file (say called "bigfile") hosted on an Amazon S3 instance (my S3 bucket shall be accessible using a partial address like: files.mycompany.com/) so users will be able to access this file at files.mycompany.com/bigfile. Now is there a way to craft a servlet (or a .jsp) so that the Content-Disposition header is always added when the user wants to download that file? What would the code look like and what are the gotchas, if any?

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  • Running a Java daemon with a GWT front-end served by embedded Jetty

    - by BinaryMuse
    Greetings, coders, Background Info and Code I am trying to create a daemon-type program (e.g., it runs constantly, polling for things to do) that is managed by a GWT application (servlets in a WAR) which is in turn served by an embedded Jetty server (using a WebAppContext). I'm having problems making the GWT application aware of the daemon object. For testing things, I currently have two projects: The daemon and embedded Jetty server in one (EmbJetTest), and the GWT application in another (DefaultApp). This is the current state of the code: First, EmbJetTest creates an embedded Jetty server like so, using a ServletContextListener to inject the daemon object into the web application context: EmbJetTest.server = new Server(8080); // Create and start the daemon Daemon daemon = new Daemon(); Thread thread = new Thread(daemon); thread.start(); // war handler WebAppContext waContext = new WebAppContext(); waContext.setContextPath("/webapp"); waContext.setWar("./apps/DefaultApp.war"); waContext.addEventListener(new DaemonLoader(daemon)); // Add it to the server EmbJetTest.server.setHandler(waContext); EmbJetTest.server.setThreadPool(new QueuedThreadPool(10)); // Start the server; join() blocks until we shut down EmbJetTest.server.start(); EmbJetTest.server.join(); // Stop the daemon thread daemon.stopLoop(); Daemon is a very simple object with a couple properties, at the moment. DaemonLoader is the following ServletContextListener implementation: private Daemon daemon; public DaemonLoader(Daemon daemon) { this.daemon = daemon; } @Override public void contextDestroyed(ServletContextEvent arg0) { } @Override public void contextInitialized(ServletContextEvent arg0) { arg0.getServletContext().setAttribute("daemon", this.daemon); } Then, in one of my servlets in the GWT application, I have the following code: Daemon daemon = (Daemon) this.getServletContext().getAttribute("daemon"); However, when I visit localhost:8080/webapp/* and invoke the servlet, this code throws a ClassCastException, even though the classes are of the same type. This StackOverflow answer indicates that this is because the two classes are loaded with different classloaders. Question My question is twofold. Am I even on the right track here? Am I going about this completely the wrong way? Something tells me I am, but I can't think of another way to make the daemon available to both applications. Is there a better way to communicate with the daemon from the GWT application? Should the GWT app own the daemon and somehow start the daemon itself? The daemon needs to run even if no one visits the one of the GWT app's servlets--how could I do this? If I am on the right track, how can I get around the classloader issue? Thanks in advance.

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  • Managing data charts

    - by Tom Gullen
    My dbml file is just getting bigger and bigger and more unwieldy: I favoured an all-in-one approach as supposed to multiple data contexts because when I tried that it was near impossible to manage in code. I was advised it was better to have them all in one chart and the difficulty will be simply in managing this chart and not in code. The chart I've got is becoming a pain to manage, if I want to even remove a table and re-add it it sometimes takes a little while to manually find it! There isn't even a list I can find in VS2010 of the objects you have in that chart! Is there a better way of doing this?

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  • How to limit JTextArea max Rows and Coloums?

    - by Billbo bug
    I am using JTextArea in JScrollPane I want to limit the maximum number of lines possible and the maximum chars in each line. I need that the string will be exactly like on the screen, each line will end with '\n' (if there another line after it) and the user will be able to insert only X lines and Y chars in each line. I tried to limit the lines but i don't know exactly how many lines do i have because of the line wrapping, The line wrapping is starting new line visualy on the screen(because of the width of the JTextArea) but in the string of the component it is really the same line with no '\n' to indicate new line. I do not have an idea how to limit the max chars in each line while typing. There are 2 stages: The typing of the string- keep that the user will not be able to type more then X lines and Y chars in each line. (even if the line wrap only visualy or the user typed '/n') Insert the string to the DB- after cliking 'OK' convert the string that every line will end with "/n" even if the user did not typed it and the line was wrapped only visualy. There are few problems if i will count the chars in the line and insert '/n' in the end of the line, thats why i decided to do it in two stages. In the first stage ehile the user is typing i would rather only limit it visualy and force line wrpping or something similar. Only in the second stage when i save string i will add the '/n' even if the user did not typed it in the end of the lines! Does anyone have an idea? I know that i will have to use DocumentFilter OR StyledDocument. Here is sample code that limit only the lines to 3:(but not the chars in row to 19) private JTextArea textArea ; textArea = new JTextArea(3,19); textArea .setLineWrap(true); textArea .setDocument(new LimitedStyledDocument(3)); JScrollPane scrollPane = new JScrollPane(textArea public class LimitedStyledDocument extends DefaultStyledDocument /** Field maxCharacters */ int maxLines; public LimitedStyledDocument(int maxLines) { maxCharacters = maxLines; } public void insertString(int offs, String str, AttributeSet attribute) throws BadLocationException { Element root = this.getDefaultRootElement(); int lineCount = getLineCount(str); if (lineCount + root.getElementCount() <= maxLines){ super.insertString(offs, str, attribute); } else { Toolkit.getDefaultToolkit().beep(); } } /** * get Line Count * * @param str * @return the count of '\n' in the String */ private int getLineCount(String str){ String tempStr = new String(str); int index; int lineCount = 0; while (tempStr.length() > 0){ index = tempStr.indexOf("\n"); if(index != -1){ lineCount++; tempStr = tempStr.substring(index+1); } else{ break; } } return lineCount; } }

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  • Setting session timezone with spring jdbc oracle

    - by user337620
    Hello I have a spring/jdbc/oracle 10g application. The Oracle server database timezone is set to GMT + 2 JVM timezone is GMT + 2 (even though it doesn't matter in my case). I have a stored procedure that performs some date operations. The problem is that session timezone is different(GMT) than database timezone even though I do not set session timezone explicit in my code/configuration. As far as I know the session timezone is by default equal to database timezone. Any idea why is the session timezone different than database timezone or how can I configure it in spring configuration (org.apache.commons.dbcp.BasicDataSource) ? Thank you.

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  • Does .net calling COM which in turn calls other .net COM object works when using SxS and manifest fi

    - by Alex Shnayder
    I have a .net application calling to a COM component (C++) which in turn calls to another COM object implemented in .NET. This application is using Windows SxS capabilities and does not register any of it's COM components. Not the one written in C++, and not the one written in .net. This first call to the C++ COM component works fine. But when the C++ COM component calls to the .net one, it fails with class not registered. I have tried creating a small C++ app with a manifest file which calls the .net component and it works. It seems that when the flow is .net - COM NATIVE - .NET COM. Then SxS breaks and does not work. When looking at Fusion Logs (assembly loading logs) I see that no one is even attempting to resolve the .NET COM assembly. Is this SxS scenario even supposed to work (I think it does supposed to work)? If yes, then what can I be doing wrong ?

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  • Why can't WordPress create directories when uploading themes?

    - by Arman
    I can't workout how to solve this problem so wordpress would let me upload themes. I have a fresh copy of Fedora 17 installed on my dev machine. I then installed mysql using: yum install mysql mysql-server. Next I installed WordPress which also installs apache and php: yum install wordpress I can go to http://localhost/wordpress and see WordPress working. But when I try tried to install my theme it asked for ftp credentials. I then updated the wp-config.php file and set the FS_METHOD constant to direct. Now it doesn't ask for ftp credentials but it gives me this error: Could not create directory. /usr/share/wordpress/wp-content/themes/my-theme-name/ httpd service is running under 'apache' user and 'apache' group. The /usr/share/wordpress/ directory is recursively own by 'apache' user and 'apache' group too. I've even set the permissions to 777 (also recursively) and even then I keep getting the same error as above. How can I solve this problem?

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  • Anyone successfully using Commission Junction API ?

    - by Mauricio Scheffer
    Is anyone successfully using the CJ web services? I just keep getting java.lang.NullPointerExceptions even though my app is .net (clearly their errors). CJ support doesn't even know what a web service is. I googled and found many people getting this or other errors. Question is: is it a temporary problem or am I doomed to parse manually downloaded reports for eternity? The specific API I'm trying to use is the daily publisher commission service. Here is the WSDL. Links: CJ web services home API Reference

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  • SQlite: Column format for unix timestamp; Integer types

    - by SF.
    Original problem: What is the right column format for a unix timestamp? The net is full of confusion: some posts claim SQLite has no unsigned types - either whatsoever, or with exception of the 64bit int type (but there are (counter-)examples that invoke UNSIGNED INTEGER). The data types page mentions it only in a bigint example. It also claims there is a 6-byte integer but doesn't give a name for it. Of course standard INTEGER being 4-byte signed signed stores unix timestamps as negative numbers. I've heard that some systems return 64-bit timestamps too. OTOH I'm not too fond of wasting 4 bytes to store 1 extra bit (top bit of timestamp), and even if I have to pick a bigger data format, I'd rather go for the 6-byte one. I've even seen a post that claims SQLite unix timestamp is of type REAL... Complete problem: Could someone please clarify that mess?

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  • XML: Process large data

    - by Atmocreations
    Hello What XML-parser do you recommend for the following purpose: The XML-file (formatted, containing whitespaces) is around 800 MB. It mostly contains three types of tag (let's call them n, w and r). They have an attribute called id which i'd have to search for, as fast as possible. Removing attributes I don't need could save around 30%, maybe a bit more. First part for optimizing the second part: Is there any good tool (command line linux and windows if possible) to easily remove unused attributes in certain tags? I know that XSLT could be used. Or are there any easy alternatives? Also, I could split it into three files, one for each tag to gain speed for later parsing... Speed is not too important for this preparation of the data, of course it would be nice when it took rather minutes than hours. Second part: Once I have the data prepared, be it shortened or not, I should be able to search for the ID-attribute I was mentioning, this being time-critical. Estimations using wc -l tell me that there are around 3M N-tags and around 418K W-tags. The latter ones can contain up to approximately 20 subtags each. W-Tags also contain some, but they would be stripped away. "All I have to do" is navigating between tags containing certain id-attributes. Some tags have references to other id's, therefore giving me a tree, maybe even a graph. The original data is big (as mentioned), but the resultset shouldn't be too big as I only have to pick out certain elements. Now the question: What XML parsing library should I use for this kind of processing? I would use Java 6 in a first instance, with having in mind to be porting it to BlackBerry. Might it be useful to just create a flat file indexing the id's and pointing to an offset in the file? Is it even necessary to do the optimizations mentioned in the upper part? Or are there parser known to be quite as fast with the original data? Little note: To test, I took the id being on the very last line on the file and searching for the id using grep. This took around a minute on a Core 2 Duo. What happens if the file grows even bigger, let's say 5 GB? I appreciate any notice or recommendation. Thank you all very much in advance and regards

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