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• How should I implement a command processing application?

  - by Nini Michaels

  I want to make a simple, proof-of-concept application (REPL) that takes a number and then processes commands on that number. Example: I start with 1. Then I write "add 2", it gives me 3. Then I write "multiply 7", it gives me 21. Then I want to know if it is prime, so I write "is prime" (on the current number - 21), it gives me false. "is odd" would give me true. And so on. Now, for a simple application with few commands, even a simple switch would do for processing the commands. But if I want extensibility, how would I need to implement the functionality? Do I use the command pattern? Do I build a simple parser/interpreter for the language? What if I want more complex commands, like "multiply 5 until >200" ? What would be an easy way to extend it (add new commands) without recompiling? Edit: to clarify a few things, my end goal would not be to make something similar to WolframAlpha, but rather a list (of numbers) processor. But I want to start slowly at first (on single numbers). I'm having in mind something similar to the way one would use Haskell to process lists, but a very simple version. I'm wondering if something like the command pattern (or equivalent) would suffice, or if I have to make a new mini-language and a parser for it to achieve my goals?

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• What are the consequences of immutable classes with references to mutable classes?

  - by glenviewjeff

  I've recently begun adopting the best practice of designing my classes to be immutable per Effective Java [Bloch2008]. I have a series of interrelated questions about degrees of mutability and their consequences. I have run into situations where a (Java) class I implemented is only "internally immutable" because it uses references to other mutable classes. In this case, the class under development appears from the external environment to have state. Do any of the benefits (see below) of immutable classes hold true even by only "internally immutable" classes? Is there an accepted term for the aforementioned "internal mutability"? Wikipedia's immutable object page uses the unsourced term "deep immutability" to describe an object whose references are also immutable. Is the distinction between mutability and side-effect-ness/state important? Josh Bloch lists the following benefits of immutable classes: are simple to construct, test, and use are automatically thread-safe and have no synchronization issues do not need a copy constructor do not need an implementation of clone allow hashCode to use lazy initialization, and to cache its return value do not need to be copied defensively when used as a field make good Map keys and Set elements (these objects must not change state while in the collection) have their class invariant established once upon construction, and it never needs to be checked again always have "failure atomicity" (a term used by Joshua Bloch) : if an immutable object throws an exception, it's never left in an undesirable or indeterminate state

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• Is there any reason not to go directly from client-side Javascript to a database?

  - by Chris Smith

  So, let's say I'm going to build a Stack Exchange clone and I decide to use something like CouchDB as my backend store. If I use their built-in authentication and database-level authorization, is there any reason not to allow the client-side Javascript to write directly to the publicly available CouchDB server? Since this is basically a CRUD application and the business logic consists of "Only the author can edit their post" I don't see much of a need to have a layer between the client-side stuff and the database. I would simply use validation on the CouchDB side to make sure someone isn't putting in garbage data and make sure that permissions are set properly so that users can only read their own _user data. The rendering would be done client-side by something like AngularJS. In essence you could just have a CouchDB server and a bunch of "static" pages and you're good to go. You wouldn't need any kind of server-side processing, just something that could serve up the HTML pages. Opening my database up to the world seems wrong, but in this scenario I can't think of why as long as permissions are set properly. It goes against my instinct as a web developer, but I can't think of a good reason. So, why is this a bad idea? EDIT: Looks like there is a similar discussion here: Writing Web "server less" applications EDIT: Awesome discussion so far, and I appreciate everyone's feedback! I feel like I should add a few generic assumptions instead of calling out CouchDB and AngularJS specifically. So let's assume that: The database can authenticate users directly from its hidden store All database communication would happen over SSL Data validation can (but maybe shouldn't?) be handled by the database The only authorization we care about other than admin functions is someone only being allowed to edit their own post We're perfectly fine with everyone being able to read all data (EXCEPT user records which may contain password hashes) Administrative functions would be restricted by database authorization No one can add themselves to an administrator role The database is relatively easy to scale There is little to no true business logic; this is a basic CRUD app

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• What can cause SQL 2008 Transaction Log Shipping to stop functioning?

  - by Rick

  I read somewhere that doing a backup or when Maintenance Plan runs can cause Log Shipping to stop functioning. Is this true? What should we watch out for once our Transaction Log Shipping is in place that could stop it? A Log Shipping test we were doing between two databases on the same SQL 2008 server appeared to stop working without any error. When we checked the History of the LSRestore_* job it was always ignoring the new *.trn files. Any suggestions? Thanks.

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• Conference networking for the socially awkward

  - by Melanie Townsend

  Do you approach a room full of strangers with excitement at all the new people you’re going to chat to over coffee and a muffin as you swap tales of how you convinced your manager to give you the day “off”? Or, do you find rooms full of strangers intimidating and begin by scouting out a place you can stand quietly and not be in someone’s way until the next session begins? If you’re on the train to extrovert city, that’s great, well done, move along. If, on the other hand, a room full of strangers who all seem to inexplicably know each other already is more challenge than opportunity, then making those connections with other professionals can be more difficult. So, here’s some advice, some gleaned from other things I’ve read online when trying to overcome my own discomfort in large groups (hopefully minus the infuriating condescension), others are just things I’ve found helpful over the years. Start small Smaller groups are less intimidating, and, now that you’ve taken the plunge to show up, it’s harder to remain inconspicuous. I find it’s easier to speak to new people once the option NOT to has been taken away. You’re there now, smile through the awkward and you’ll be forever grateful when the three people you’ve met and gotten to know here are also at that gigantic conference later on (ideally, introducing you to other people). Smile, or at the very least, stop scowling You probably don’t even know you’re doing it. If your resting face doesn’t come across as manically happy, tinge that with some social anxiety and you become one great ball of unapproachable. Normally, I wouldn’t suggest this as a problem that needs fixing, I have personally honed this face to use while travelling alone all the time. However, if you are indeed hoping to meet some useful people and get the most out of this conference, you may need to remind yourself to smile. Prepare some ice breakers This is going to sound stupid, like “no one does this right?” stupid, but, just, trust me a minute. It’s okay to prepare. You don’t need to write word-for-word questions to ask people and practice them in a mirror – that would be strange. I’m suggesting to just have an arsenal of questions to ask people if you get stuck, what session has been your favorite, which ones are you most looking forward to, have you heard X presenter speak before, what did you think of them? Even just thinking about these things in advance can help, and, as a bonus, while the other person is answering it gives you a moment to tamp down that panic, I mean breathe, I mean get to know them. You’re not alone (in the least creepy way possible) See that person in the corner clutching their phone with a mild deer in the headlights look?  That is potentially your new conference buddy. Starting with something along the lines of: I don’t know about you, the sessions here are great but I find the crowds a little tough to deal with. Mind if I park here for a second? is a decent opener. Just walking around and looking at exhibitors (if applicable) is fine, but it’s a little too easy to wander about and not actually speak to anyone if that’s all you’re doing. If joining a group of people talking is too much to start with, one-on-one can be easier. Have goals Are there people in particular you wanted to speak to? Did you have a personal goal of speaking to at least “x” new people? Are you trying to get a contact in a specific company because you want to work with them on something? Does the business have vague goals as well that you may or may not be judged on later? Making specific goals you can accomplish lets you know whether you’ve actually succeeded in your “networking pursuits” or what you need to work on more for next time. Everyone’s got their own coping technique. Some people are able to remind themselves that “humans are fundamentally social creatures” and somehow that helps them, others drink which is not really something I recommend for professional conferences but to each their own, and some focus on the fact that networking can play a big role in their career path. Just do what works for you, and if there’re any tricks you’ve found helpful over the years, please share em.

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• Is there such a concept as "dead thumbnails" in Windows?

  - by Pacerier

  I realised that in disk cleanup (cleanmgr.exe) there is an item "Thumbnails": Windows keeps a copy of all of your picture, video, and document thumbnails so they can be displayed quickly when you open a folder. If you delete these thumbnails, they will be automatically recreated as needed. I was pondering about why there is even an option to delete the thumbnails. Is it true that there will be "dead" thumbnails (for example if I delete a folder that has a thumbnail and the folder is deleted but the thumbnail still exists) so this option is used to clean "dead" thumbnails?

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• In Visio 2010, how can I create a mandatory, non-identifying relationship between two database tables

  - by Cam Jackson

  I'm working in MS Visio 2010. This is the relevant part of my ERD: The relationship between Event and Adventure is correct: there's a foreign key from Event to Adventure, and that FK is part of Event's primary key. However, what I can't figure out is how to make the relationship line from Adventure to AccomodationType be the same, without making that relationship part of the PK of adventure. When I look at the 'Miscellaneous' properties of that relationship line, I want it to be: Cardinality: Zero or more Relationship type: Non-identifying Child has parent: Not optional (mandatory) But the checkbox for the third property is greyed out, and toggles between True/False as I make the relationship Non-identifying/Identifying. The only way I could figure out was to disconnect the two columns, from the 'Definition' tab, which then un-grey's the 'Optional' checkbox, but then I lose the foreign key property on the accomType column, and while the relationship symbols are correct, the line remains dotted. Any ideas, anyone?

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• XNA - Error while rendering a texture to a 2D render target via SpriteBatch

  - by Jared B

  I've got this simple code that uses SpriteBatch to draw a texture onto a RenderTarget2D: private void drawScene(GameTime g) { GraphicsDevice.Clear(skyColor); GraphicsDevice.SetRenderTarget(targetScene); drawSunAndMoon(); effect.Fog = true; GraphicsDevice.SetVertexBuffer(line); effect.MainEffect.CurrentTechnique.Passes[0].Apply(); GraphicsDevice.DrawPrimitives(PrimitiveType.TriangleStrip, 0, 2); GraphicsDevice.SetRenderTarget(null); SceneTexture = targetScene; } private void drawPostProcessing(GameTime g) { effect.SceneTexture = SceneTexture; GraphicsDevice.SetRenderTarget(targetBloom); spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque, null, null, null); { if (Bloom) effect.BlurEffect.CurrentTechnique.Passes[0].Apply(); spriteBatch.Draw( targetScene, new Rectangle(0, 0, Window.ClientBounds.Width, Window.ClientBounds.Height), Color.White); } spriteBatch.End(); BloomTexture = targetBloom; GraphicsDevice.SetRenderTarget(null); } Both methods are called from my Draw(GameTime gameTime) function. First drawScene is called, then drawPostProcessing is called. The thing is, when I run this code I get an error on the spriteBatch.Draw call: The render target must not be set on the device when it is used as a texture. I already found the solution, which is to draw the actual render target (targetScene) to the texture so it doesn't create a reference to the loaded render target. However, to my knowledge, the only way of doing this is to write: GraphicsDevice.SetRenderTarget(outputTarget) SpriteBatch.Draw(inputTarget, ...) GraphicsDevice.SetRenderTarget(null) Which encounters the same exact problem I'm having right now. So, the question I'm asking is: how would I render inputTarget to outputTarget without reference issues?

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• Use netcat as a proxy to log traffic

  - by deephacks

  I want to use netcat as a proxy to log http requests and responses to files, then tail these to inspect traffic. Think wireshark. Tried the following where 'fifo' is a named pipe, 'in' and 'out' are files, netcat proxy on port 8080, server on port 8081. while true; do cat fifo | nc -l -p 8080 | tee -a in | nc localhost 8081 | tee -a out 1fifo; done Problems: Netcat stop responing after first request (while loop ignored?). Netcat fails with msg localhost [127.0.0.1] 8081 (tproxy) : Connection refused if server unavailable on 8081. Question: Is it possible to "lazily" connect to 8081 when request is made? I.e. I do not want to have 8081 running when netcat is started.

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• Oracle Java Cloud Service - Platform as a Service for Your Java Applications

  - by GeneEun

  Oracle Java Cloud Service is an enterprise grade Platform as a Service for developing, testing, and deploying business applications. For Java developers, Java Cloud Service provides the power, flexibility, and performance of a true Java EE container in the cloud. Java Cloud Service delivers one of the key advantages of the Java platform, the ability to “write once, run anywhere”. Because of the standards-based approach, there's no need to worry that applications you build and deploy are forever locked into the Oracle Cloud.  In fact, you can use Java Cloud Service just as you would an on-premise Java EE environment and deploy your Java applications on a Java Cloud Service instance as-is. Provisioning of Java Cloud Service instances is self-service and takes only minutes, making access to Java environments both quick and easy. Java Cloud Service instances are also automatically associated with Oracle Database Cloud Service instances, so there's no complex setup involved in order to get a complete application environment up and running.If you're attending Oracle OpenWorld in San Francisco this week, I'm sure you've seen that there are many sessions covering Oracle Cloud services, including Java Cloud Service. Each session will provide a wealth of information, so I highly recommend you consult your conference schedule and try to check them out. In the meantime, here's a short video about Java Cloud Service. Enjoy!

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• IIS7 FTP Setup - An error occured during the authentication process. 530 End Login failed

  - by robmzd

  I'm having a problem very similar to IIS 7.5 FTP IIS Manager Users Login Fail (530) on Windows Server 2008 R2 Standard. I have created an FTP site and IIS Manager user but am having trouble logging in. I could really do with getting this working with the IIS Manager user rather than by creating a new system user since I'm fairly restricted with those accounts. Here is the output when connecting locally through command prompt: C:\Windows\system32>ftp localhost Connected to MYSERVER. 220 Microsoft FTP Service User (MYSERVER:(none)): MyFtpLogin 331 Password required for MyFtpLogin. Password: *** 530-User cannot log in. Win32 error: Logon failure: unknown user name or bad password. Error details: An error occured during the authentication process. 530 End Login failed. I have followed the guide to configure ftp with iis manager authentication in iis 7 and Adding FTP Publishing to a Web Site in IIS 7 Things I have done and checked: The FTP Service is installed (along with FTP Extensibility). Local Service and Network Service have been given access to the site folder Permission has been given to the config files Granted read/write permissions to the FTP Root folder The Management Service is installed and running Enable remote connections is ticked with 'Windows credentials or IIS manager credentials' selected The IIS Manager User has been added to the server (root connection in the IIS connections branch) The new FTP site has been added IIS Manager Authentication has been added to the FTP authentication providers The IIS Manager user has been added to the IIS Manager Permissions list for the site Added Read/Write permissions for the user in the FTP Authorization Rules Here's a section of the applicationHost config file associated with the FTP site <site name="MySite" id="8"> <application path="/" applicationPool="MyAppPool"> <virtualDirectory path="/" physicalPath="D:\Websites\MySite" /> </application> <bindings> <binding protocol="http" bindingInformation="*:80:www.mydomain.co.uk" /> <binding protocol="ftp" bindingInformation="*:21:www.mydomain.co.uk" /> </bindings> <ftpServer> <security> <ssl controlChannelPolicy="SslAllow" dataChannelPolicy="SslAllow" /> <authentication> <basicAuthentication enabled="true" /> <customAuthentication> <providers> <add name="IisManagerAuth" enabled="true" /> </providers> </customAuthentication> </authentication> </security> </ftpServer> </site> ... <location path="MySite"> <system.ftpServer> <security> <authorization> <add accessType="Allow" users="MyFtpLogin" permissions="Read, Write" /> </authorization> </security> </system.ftpServer> </location> If I connect to the Site (not FTP) from my local IIS Manager using the same IIS Manager account details then it connects fine, I can browse files and change settings as I would locally (though I don't seem to have an option to upload files). Trying to connect via FTP though either through the browser or FileZilla etc... gives me: Status: Resolving address of www.mydomain.co.uk Status: Connecting to 123.456.12.123:21... Status: Connection established, waiting for welcome message... Response: 220 Microsoft FTP Service Command: USER MyFtpLogin Response: 331 Password required for MyFtpLogin. Command: PASS ********* Response: 530 User cannot log in. Error: Critical error Error: Could not connect to server I have tried collecting etw traces for ftp sessions, in the logs I get a FailBasicLogon followed by a FailCustomLogon, but no other info: FailBasicLogon SessionId={cad26a97-225d-45ba-ab1f-f6acd9046e55} | ErrorCode=0x8007052E StartCustomLogon SessionId={cad26a97-225d-45ba-ab1f-f6acd9046e55} | LogonProvider=IisManagerAuth StartCallProvider SessionId={cad26a97-225d-45ba-ab1f-f6acd9046e55} | provider=IisManagerAuth EndCallProvider SessionId={cad26a97-225d-45ba-ab1f-f6acd9046e55} EndCustomLogon SessionId={cad26a97-225d-45ba-ab1f-f6acd9046e55} FailCustomLogon SessionId={cad26a97-225d-45ba-ab1f-f6acd9046e55} | ErrorCode=0x8007052E FailFtpCommand SessionId={cad26a97-225d-45ba-ab1f-f6acd9046e55} | ReturnValue=0x8007052E | SubStatus=ERROR_DURING_AUTHENTICATION In the normal FTP logs I just get: 2012-10-23 16:13:11 123.456.12.123 - 123.456.12.123 21 ControlChannelOpened - - 0 0 e2d4e935-fb31-4f2c-af79-78d75d47c18e - 2012-10-23 16:13:11 123.456.12.123 - 123.456.12.123 21 USER MyFtpLogin 331 0 0 e2d4e935-fb31-4f2c-af79-78d75d47c18e - 2012-10-23 16:13:11 123.456.12.123 - 123.456.12.123 21 PASS *** 530 1326 41 e2d4e935-fb31-4f2c-af79-78d75d47c18e - 2012-10-23 16:13:11 123.456.12.123 - 123.456.12.123 21 ControlChannelClosed - - 0 0 e2d4e935-fb31-4f2c-af79-78d75d47c18e - If anyone has any ideas than I would be very grateful to hear them. Many thanks.

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• How to explain pointers to a Java/VB programmer

  - by Skeith

  I am writing a game and my friend has offered to help me as it is a RPG and will take a long time to do the "scripting" bit of the game. The problem is IMO he's not that good a programmer :( (add flame war here). He has only programmed in Java and VB and keeps saying really stupid things to me like "Why don't you drag and drop an onClick event" to design my UI when I'm using DirectX. I tried explaining pointers to him but his response was, if it's just a variable that holds a memory address, why don't you just use an int? I create an instance of an attack class and give the creature a pointer to it so if several creatures use the same attack there is only one instance of it. He keeps saying why not put if statements in the creature class for every attack class and set true for the ones that are there. He has programmed mainly in VB and a little in Java just to learn OOP. How can I explain advanced C++ concepts like pointers and memory management to him? He just doesn't understand there are no super functions like form.show in C++.

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• What do you think of this iterator syntax?

  - by ChaosPandion

  I've been working on an ECMAScript dialect for quite some time now and have reached a point where I am comfortable adding new language features. I would love to hear some thoughts and suggestions on the syntax. Example iterator Numbers { yield 1; yield 2; yield 3; if (true) { yield break; } yield continue iterator { yield 4; yield 5; yield 6; }; } Syntax IteratorDeclaration:     iterator  Identifier  {  IteratorBody  } IteratorExpression:     iterator  Identifieropt  {  IteratorBody  } IteratorBody:     IteratorStatementsopt IteratorStatements:     IteratorStatement IteratorStatementsopt IteratorStatement:     Statement but not one of BreakStatement ContinueStatement ReturnStatement     YieldStatement     YieldBreakStatement     YieldContinueStatement YieldStatement:     yield  Expression  ; YieldBreakStatement:     yield  break  ; YieldContinueStatement:     yield  continue  Expression  ;

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• Oracle licensing /pricing ?

  - by Quandary

  Question: I'd like to download Oracle 11g database for evaluation purposes. Now I found this link for downloads: http://www.oracle.com/technetwork/database/enterprise-edition/downloads/index.html But it says one must register 'for accessing premium contents'. But in the same time, it looks like one can download the full database for free. But surely, Oracle doesn't give it for free, but in the registration, there's no mention of any cost/fees, or any billing address. Is this registration free, or as 'premium' suggests, will you get a bill for it if you do (supposed you enter true data) ? Or how does Oracle handle licensing/payment ? I can not see any price tag there anywhere, nor any information on it on that registration page.

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• android game performance regarding timers

  - by iQue

  Im new to the game-dev world and I have a tendancy to over-simplify my code, and sometimes this costs me alot fo memory. Im using a custom TimerTask that looks like this: public class Task extends TimerTask { private MainGamePanel panel; public Task(MainGamePanel panel) { this.panel=panel; } /** * When the timer executes, this code is run. */ public void run() { panel.createEnemies(); } } this task calls this method from my view: public void createEnemies() { Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.female); if(enemyCounter < 24){ enemies.add(new Enemy(bmp, this)); } enemyCounter++; } Since I call this in the onCreate-method instead of in my views contructor (because My enemies need to get width and height of view). Im wondering if this will work when I have multiple levels in game (start a new intent). And if this kind of timer really is the best way to add a delay between the spawning-time of my enemies performance-wise. adding code for my timer if any1 came here cus they dont understand timers: private Timer timer1 = new Timer(); private long delay1 = 5*1000; // 5 sec delay public void surfaceCreated(SurfaceHolder holder) { timer1.schedule(new Task(this), 0, delay1); //I call my timer and add the delay thread.setRunning(true); thread.start(); }

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• python Velocity control of the player, why doesn't this work?

  - by Dominic Grenier

  I have the following code inside a while True loop: if abs(playerx) < MAXSPEED: if moveLeft: playerx -= 1 if moveRight: playerx += 1 if abs(playery) < MAXSPEED: if moveDown: playery += 1 if moveUp: playery -= 1 if moveLeft == False and abs(playerx) > 0: playerx += 1 if moveRight == False and abs(playerx) > 0: playerx -= 1 if moveUp == False and abs(playery) > 0: playery += 1 if moveDown == False and abs(playery) > 0: playery -= 1 player.x += playerx player.y += playery if player.left < 0 or player.right > 1000: player.x -= playerx if player.top < 0 or player.bottom > 600: player.y -= playery The intended result is that while an arrow key is pressed, playerx or y increments by one at every loop until it reaches MAXSPEED and stays at MAXSPEED. And that when the player stops pressing that arrow key, his speed decreases. Until it reaches 0. To me, this code explicitly says that... But what actually happens is that playerx or y keeps incrementing regardless of MAXSPEED and continues moving even after the player stops pressing the arrow key. I keep rereading but I'm completely baffled by this weird behavior. Any insights? Thanks.

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• rm on a directory with millions of files

  - by BMDan

  Background: physical server, about two years old, 7200-RPM SATA drives connected to a 3Ware RAID card, ext3 FS mounted noatime and data=ordered, not under crazy load, kernel 2.6.18-92.1.22.el5, uptime 545 days. Directory doesn't contain any subdirectories, just millions of small (~100 byte) files, with some larger (a few KB) ones. We have a server that has gone a bit cuckoo over the course of the last few months, but we only noticed it the other day when it started being unable to write to a directory due to it containing too many files. Specifically, it started throwing this error in /var/log/messages: ext3_dx_add_entry: Directory index full! The disk in question has plenty of inodes remaining: Filesystem Inodes IUsed IFree IUse% Mounted on /dev/sda3 60719104 3465660 57253444 6% / So I'm guessing that means we hit the limit of how many entries can be in the directory file itself. No idea how many files that would be, but it can't be more, as you can see, than three million or so. Not that that's good, mind you! But that's part one of my question: exactly what is that upper limit? Is it tunable? Before I get yelled at--I want to tune it down; this enormous directory caused all sorts of issues. Anyway, we tracked down the issue in the code that was generating all of those files, and we've corrected it. Now I'm stuck with deleting the directory. A few options here: rm -rf (dir)I tried this first. I gave up and killed it after it had run for a day and a half without any discernible impact. unlink(2) on the directory: Definitely worth consideration, but the question is whether it'd be faster to delete the files inside the directory via fsck than to delete via unlink(2). That is, one way or another, I've got to mark those inodes as unused. This assumes, of course, that I can tell fsck not to drop entries to the files in /lost+found; otherwise, I've just moved my problem. In addition to all the other concerns, after reading about this a bit more, it turns out I'd probably have to call some internal FS functions, as none of the unlink(2) variants I can find would allow me to just blithely delete a directory with entries in it. Pooh. while [ true ]; do ls -Uf | head -n 10000 | xargs rm -f 2/dev/null; done ) This is actually the shortened version; the real one I'm running, which just adds some progress-reporting and a clean stop when we run out of files to delete, is: export i=0; time ( while [ true ]; do ls -Uf | head -n 3 | grep -qF '.png' || break; ls -Uf | head -n 10000 | xargs rm -f 2/dev/null; export i=$(($i+10000)); echo "$i..."; done ) This seems to be working rather well. As I write this, it's deleted 260,000 files in the past thirty minutes or so. Now, for the questions: As mentioned above, is the per-directory entry limit tunable? Why did it take "real 7m9.561s / user 0m0.001s / sys 0m0.001s" to delete a single file which was the first one in the list returned by "ls -U", and it took perhaps ten minutes to delete the first 10,000 entries with the command in #3, but now it's hauling along quite happily? For that matter, it deleted 260,000 in about thirty minutes, but it's now taken another fifteen minutes to delete 60,000 more. Why the huge swings in speed? Is there a better way to do this sort of thing? Not store millions of files in a directory; I know that's silly, and it wouldn't have happened on my watch. Googling the problem and looking through SF and SO offers a lot of variations on "find" that obviously have the wrong idea; it's not going to be faster than my approach for several self-evident reasons. But does the delete-via-fsck idea have any legs? Or something else entirely? I'm eager to hear out-of-the-box (or inside-the-not-well-known-box) thinking. Thanks for reading the small novel; feel free to ask questions and I'll be sure to respond. I'll also update the question with the final number of files and how long the delete script ran once I have that. Final script output!: 2970000... 2980000... 2990000... 3000000... 3010000... real 253m59.331s user 0m6.061s sys 5m4.019s So, three million files deleted in a bit over four hours.

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• sending php mail from localhost

  - by SimplySimon

  I have installed php, mySQL, postfix and sendmail and have set up a simple email script on my local host server. mail() returns 1 (TRUE) when I send an e-mail, however the email does not arrive at the destination. Installation The mail functions are part of the PHP core. There is no installation needed to use these functions. Requirements For the mail functions to be available, PHP requires an installed and working email system. The program to be used is defined by the configuration settings in the php.ini file. Runtime Configuration The behavior of the mail functions is affected by settings in the php.ini file. Mail configuration options: Name Default Description Changeable sendmail_path NULL Unix systems only: Specifies where the sendmail program can be found (usually /usr/sbin/sendmail or /usr/lib/sendmail) PHP_INI_SYSTEM I found it at /usr/lib/sendmail however, I can not find the configuration file, which is where I assume my problem is, as I have not told anything which server I am using to send my mail through. If anyone can help me I would be grateful.

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• 7u45 Caller-Allowable-Codebase and Trusted-Library

  - by costlow

  Java 7 update 45 (October 2013) changed the interactions between JavaScript and Java Applets made through LiveConnect. The 7u45 update is a critical patch update that has also raised the security baseline and users are strongly recommended to upgrade. Versions below the security baseline used to apply the Trusted-Library Manifest attribute to call between sandboxed code and higher-privileged code. The Trusted-Library value was a Boolean true or false. Security changes for the current security baseline (7u45) introduced a different Caller-Allowable-Codebase that indicates precisely where these LiveConnect calls can originate. For example, LiveConnect calls should not necessarily originate from 3rd party components of a web page or other DOM-based browser manipulations (pdf). Additional information about these can be located at “JAR File Manifest Attributes for Security.” The workaround for end-user dialogs is described on the 7u45 release notes, which explains removing the Trusted-Library attribute for LiveConnect calls in favor of Caller-Allowable-Codebase. This provides necessary protections (without warnings) for all users at or above the security baseline. Client installations automatically detect updates to the secure baseline and prompt users to upgrade. Warning dialogs above or below Both of these attributes should work together to support the various versions of client installations. We are aware of the issue that modifying the Manifest to use the newer Caller-Allowable-Codebase causes warnings for users below the security baseline and that not doing it displays a warning for users above. Manifest Attribute 7u45 7u40 and below Only Caller-Allowable-Codebase No dialog Displays prompt Only Trusted-Library Displays prompt No dialog Both Displays prompt (*) No dialog This will be fixed in a future release so that both attributes can co-exist. The current work-around would be to favor using Caller-Allowable-Codebase over the old Trusted-Library call. For users who need to stay below the security baseline System Administrators that schedule software deployments across managed computers may consider applying a Deployment Rule Set as described in Option 1 of “What to do if your applet is blocked or warns of mixed code.” System Administrators may also sign up for email notifications of Critical Patch Updates.

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• Bash preexecute

  - by Alex_Bender

  I'm trying to write bash command wrapper, which will be patch bash current command on the fly. But i'm faced with the problem. As i'm not a good Shell user, i can't write right expression of variable assignment in string. See bellow: I'm set trap to preexecute, through this: alex@bender:~$ trap "caller >/dev/null || xxx \"\${BASH_COMMAND}"\" DEBUG; I want change variable BASH_COMMAND, do something like BASH_COMMAND=xxx ${BASH_COMMAND} but i don't know, how i need escaping variables in this string NOTE: xxx -- my custom function, which must return some value, if in end of command situated word teststr function xxx(){ # find by grep, if teststr in the end `echo "$1" | grep "teststr$" >/dev/null`; # if true ==> do if [ "$?" == "0" ]; then # cut last 6 chars (len('teststr')==6) var=`echo "$1" | sed 's/......$//'`; echo "$var"; fi } How can i do this stuff?: alex@bender:~$ trap "caller >/dev/null || ${BASH_COMMAND}=`xxx $BASH_COMMAND`" DEBUG;

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• Oracle Develop Newbies

  - by Cassandra Clark

  tweetmeme_url = 'http://blogs.oracle.com/develop/2010/06/oracle_develop_newbies.html'; Share .FBConnectButton_Small{background-position:-5px -232px !important;border-left:1px solid #1A356E;} .FBConnectButton_Text{margin-left:12px !important ;padding:2px 3px 3px !important;} There are a number of us in the Oracle Technology Network team that came over from the Sun acquisition so we are true Oracle Develop "newbies."  We are boning up on Oracle history and thought it would be fun to test your knowledge too.  Below are a few Oracle history questions.  Post your answers in the comment section of the blog and if you answer all questions correctly you will be listed in the next post as an "Oracle Genius".  Feel free to turn the tables on your fellow blog readers by posting your own Oracle history questions.  If you stump the community we'll add your question to our next post as well.  Oracle History Quiz - In 2003, what Applications rival company did Oracle acquire?In which year was JDeveloper first released?In what language was Oracle v 1.0 written?What Oracle program is designed to recognize and reward members of the Oracle Technology and Applications communities for their contributions back to the Oracle community?What party event draws in nearly 4,000 attendees every year during Oracle OpenWorld, Oracle Develop and now JavaOne?See you in September! 

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• XNA - Render texture to a rendertarget 2d via SpriteBatch error

  - by Jared B

  I got simple code that uses SpriteBatch to draw a texture onto a RenderTarget2D... private void drawScene(GameTime g) { GraphicsDevice.Clear(skyColor); GraphicsDevice.SetRenderTarget(targetScene); drawSunAndMoon(); effect.Fog = true; GraphicsDevice.SetVertexBuffer(line); effect.MainEffect.CurrentTechnique.Passes[0].Apply(); GraphicsDevice.DrawPrimitives(PrimitiveType.TriangleStrip, 0, 2); GraphicsDevice.SetRenderTarget(null); SceneTexture = targetScene; } private void drawPostProcessing(GameTime g) { effect.SceneTexture = SceneTexture; GraphicsDevice.SetRenderTarget(targetBloom); spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque, null, null, null); { if(Bloom) effect.BlurEffect.CurrentTechnique.Passes[0].Apply(); spriteBatch.Draw(targetScene, new Rectangle(0, 0, Window.ClientBounds.Width, Window.ClientBounds.Height), Color.White); } spriteBatch.End(); BloomTexture = targetBloom; GraphicsDevice.SetRenderTarget(null); } Both methods are called from Draw(GameTime gameTime). First drawScene is called, then drawPostProcessing is called. The thing is, I can't run the code because "the render target must not be set on the device when it is used as a texture." at line spriteBatch.Draw(targetScene, new Rectangle(0, 0, Window.ClientBounds.Width, Window.ClientBounds.Height), Color.White); I already found the solution, which is to draw the actual renderTarget (targetScene) to the texture so it doesn't create a reference to the loaded rendertarget. However, to my knowledge, the only way of doing this is to write: GraphicsDevice.SetRenderTarget(OutputTarget) SpriteBatch.Draw(InputTarget, ...) GraphicsDevice.SetRenderTarget(null) Which encounters the same exact problem I'm having right now. So, the question I'm asking is: how would I render InputTarget to OutputTarget without reference issues?

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• Static classes and/or singletons -- How many does it take to become a code smell?

  - by Earlz

  In my projects I use quite a lot of static classes. These are usually classes that naturally seem to fit into a single-instance type of thing. Many times I use static classes and recently I've started using some singletons. How many of these does it take to become a code smell? For instance, in my recent project which has a lot of static classes is an Authentication library for ASP.Net. I use a static class for a helper class that fixes ASP.Net error codes so it can be used like CustomErrorsFixer.Fix(Context); Or my authentication class itself is a static class //in global.asax's begin_application Authentication.SomeState="blah"; Authentication.SomeOption=true; //etc //in global.asax's begin_request Authentication.Authenticate(); When are static or singleton classes bad to use? Am I doing it wrong, or am I just in a project that by definition has very little per-instance state associated with it? The only per-instance state I have is stored in HttpContext.Current.Items like so: /// <summary> /// The current user logged in for the HTTP request. If there is not a user logged in, this will be null. /// </summary> public static UserData CurrentUser{ get{ return HttpContext.Current.Items["fscauth_currentuser"] as UserData; //use HttpContext.Current as a little place to persist static data for this request } private set{ HttpContext.Current.Items["fscauth_currentuser"]=value; } }

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• Read video from dvd in RAW filesystem

  - by kpinhack

  Hallo, i've got some dvds that were recorded on a dvd recorder. I can not read those dvds on windows PCs (i tried multiple PCs). The properties of the discs say that the filesystem of the disc is RAW and i think that is the reason why windows does not read the disc. If that is true, what can i do to read the dvds ? Or what else could be the problem ? EDIT: The windows PCs i tried play back regular DVDs without any problem, and the "RAW" dvds recorded with the dvd recorder will not play on a standalone dvd player. Thank you!

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• links for 2011-01-10

  - by Bob Rhubart

  Clusterware 11gR2: Setting up an Active/Passive failover configuration (Oracle Luxembourg XPS on Database) Some think that expensive third-party cluster systems are necessary when it comes to protecting a system with an Active/Passive architecture with failover capabilities. Not true, according to Gilles Haro. (tags: oracle otn database) Atul Kumar: Part IX : Install OAM Agent - 11g WebGate with OAM 11g Part 9 of Atul's step by step guide to the installation of Oracle Identity Management. (tags: oracle oam identitymanagement security otn) Michel Schildmeijer: Oracle Service Bus: enable / disable proxy service with WLST Amis Technology's Michel Schildmeijer shares a process he found for enabling / disabling a proxy service within Oracle Service Bus 11g with WLST (WebLogic Scripting tool). (tags: oracle soa servicebus weblogic) @andrejusb: SOA & E2.0 Partner Community Forum XIII - in Utrecht, The Netherlands Oracle ACE Director Andrejus Baranovskis shares a nice plug for the SOA & E2.0 Partner Community Forum XIII coming up in March in the Netherlands. (tags: oracle oracleace otn soa enterprise2.0) Oracle Magazine Architect Column: Enterprise Architecture in Interesting Times Oracle ACE Directors Lonneke Dikmans, Ronald van Luttikhuizen, Mike van Alst, and Floyd Teter and Oracle enterprise architect Mans Bhuller share their thoughts on the forces that are shaping enterprise architecture. (tags: oracle otn architect entarch oraclemag) InfoQ: Deriving Agility from SOA and BPM - Ten Things that Separate the Winners from the Losers In this presentation from SOA Symposium 2010, Manas Deb and Clemens Utschig-Utschig discuss how to derive business agility from SOA and BPM, motivations for agility, developing and nurturing agility, influencers and dependencies, how SOA and BPM enable agility, pitfalls and recommendations for organizational culture, and pitfalls and recommendations for business and technical architectures. (tags: ping.fm)

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