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  • Alternatives to Java bytecode instrumentation

    - by Rafael Regis
    I'm starting a project that will have to instrument java applications for coverage purposes (definition-usage of variables, etc). It has to add trace statements and some logic to the application and maybe remove statements. I have searched for ways of instrument Java code and what I always find is about bytecode instrumentation. My question is: It's the only way to instrument Java applications? There is any other way to do that? What are the advantages of bytecode instrumentation over the others? I'll probably use the bytecode solution, but I want to know what are the problems with the other approaches (if any) to decide precisely. Thanks!

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  • Why do VMs need to be "stack machines" or "register machines" etc.?

    - by Prog
    (This is an extremely newbie-ish question). I've been studying a little about Virtual Machines. Turns out a lot of them are designed very similarly to physical or theoretical computers. I read that the JVM for example, is a 'stack machine'. What that means (and correct me if I'm wrong) is that it stores all of it's 'temporary memory' on a stack, and makes operations on this stack for all of it's opcodes. For example, the source code 2 + 3 will be translated to bytecode similar to: push 2 push 3 add My question is this: JVMs are probably written using C/C++ and such. If so, why doesn't the JVM execute the following C code: 2 + 3..? I mean, why does it need a stack, or in other VMs 'registers' - like in a physical computer? The underlying physical CPU takes care of all of this. Why don't VM writers simply execute the interpreted bytecode with 'usual' instructions in the language the VM is programmed with? Why do VMs need to emulate hardware, when the actual hardware already does this for us? Again, very newbie-ish questions. Thanks for your help

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  • Mysql ninja tricks

    - by alexn
    Hi, what are your mysql ninja tricks? What features are extra special? I'm starting with ORDER BY FIELD which enables you to sort in a particular order, like this: SELECT url FROM customer ORDER BY FIELD(customer.priority, 1, 2, 3, 0) Features like this is hard to find in the mysql documentation. Bring it!

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  • [MINI HOW-TO] Create Keyboard Shortcuts to Applications in Windows

    - by Asian Angel
    Do you need just one or a few special keyboard shortcuts for your favorite program(s)? A quick modification to program shortcuts will get you up and running without installing additional software. Creating New Keyboard Shortcuts Go to the start menu shortcut for the program, right-click on it, and select properties. When the properties window opens click in the shortcut key text area. All that you need to do is choose an appropriate letter for the program (i.e. O for Opera, E for Editra, etc.) and type it in the blank. You will not need to type any other keys or combination in…the “Ctrl + Alt +” will be automatically entered for you as soon as you type the letter in. Click OK to finish creating the new keyboard shortcut. Those new keyboard shortcuts will speed up access to your favorite software. Another example from our system using “I” for Iron Browser. Certainly much quicker than using the start menu. Conclusion If you only need one or just a few special keyboard shortcuts then this method provides a quick and simple solution. Similar Articles Productive Geek Tips Show Keyboard Shortcut Access Keys in Windows VistaUse the Windows Key for the "Start" Menu in Ubuntu LinuxCreate Custom Windows Key Keyboard Shortcuts in WindowsHow-To Geek on Lifehacker: Control Your Computer with Shortcuts & Speed Up Vista SetupKeyboard Ninja: 21 Keyboard Shortcut Articles TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips CloudBerry Online Backup 1.5 for Windows Home Server Snagit 10 VMware Workstation 7 Acronis Online Backup Windows Firewall with Advanced Security – How To Guides Sculptris 1.0, 3D Drawing app AceStock, a Tiny Desktop Quote Monitor Gmail Button Addon (Firefox) Hyperwords addon (Firefox) Backup Outlook 2010

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  • Eclipse + Django: How to get bytecode output when python source files change?

    - by Sean Ochoa
    Whenever I change my python source files in my Django project, the .pyc files become out of date. Of course that's because I need to recompile them in order to test them through my local Apache web server. I would like to get around this manual process by employing some automatic means of compiling them on save, or on build through Eclipse, or something like that. What's the best and proper way to do this?

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  • Change Desktop Resolution With a Keyboard Shortcut

    - by Matthew Guay
    Do you find yourself changing your monitor resolution several times a day?  If so, you might like this handy way to set a keyboard shortcut for your most-used resolutions. Most users rarely have to change their screen resolution often, as LCD monitors usually only look best at their native resolution.  But netbooks present a unique situation, as their native resolution is usually only 1024×600.  Some newer netbooks offer higher resolutions which may not looks as crisp as the native resolution but can be handy for using a program that expects a higher resolution.  This is the perfect situation for a keyboard shortcut to help you change the resolution without having to hassle with dialogs and menus each time, and HRC – HotKey Resolution Changer makes it easy to do. Create Keyboard Shortcuts Download the HRC – HotKey Resolution Changer (link below), unzip, and then run HRC.exe in the folder. This will start a tray icon, and will not automatically open the HRC window.  You don’t have to install HRC.  Double-click the tray icon to open it.  Note: Windows 7 automatically hides new tray icons, so if you can’t see it, click the arrow to see the hidden tray icons. By default, HRC will show two entries with your default resolutions, color depth, and refresh rate. Add a keyboard shortcut by clicking the Change button over the resolution.  Press the keyboard shortcut you want to press to switch to that resolution; we entered Ctrl+Alt+1 for our default resolution.  Make sure not to use a keyboard shortcut you use in another application, as this will override it.  Click Set when you’ve entered the hotkey(s) you want. Now, on the second entry, select the resolution you want for your alternate resolution.  The drop-down list will only show your monitor’s supported resolutions, so you don’t have to worry about choosing an incorrect resolution.  You can also set a different color depth or refresh rate for this resolution.  Now add a keyboard shortcut for this resolution as well. You can set keyboard shortcuts for up to 9 different resolutions with HRC.  Click the Select number of HotKeys button on the left, and choose the number of resolutions you want to set.  Here we have unique keyboard shortcuts for our three most-used resolutions on our netbook. HRC must be kept running to use the keyboard shortcuts, so click the Minimize to tray icon which is the second icon to the right.  This will keep it running in the tray. If you want to be able to change your resolution anytime, you’ll want HRC to automatically start with Windows.  Create a shortcut to HRC, and paste it into your Windows startup folder.  You can easily open this folder by entering the following in the Run command or in the address bar in Explorer: %appdata%\Microsoft\Windows\Start Menu\Programs\Startup   Conclusion HRC- HotKey Resolution Changer gives you a great way to quickly change your screen resolution with a keyboard shortcut.  Whether or not you love keyboard shortcuts, this is still a much easier way to switch between your most commonly used resolutions. Download HRC – HotKey Resolution Changer Similar Articles Productive Geek Tips Create a Keyboard Shortcut to Access Hidden Desktop Icons and FilesGet Mac’s Hide Others (cmd+opt+H) Keyboard Shortcut for WindowsHide Desktop Icon Text on Windows 7 or VistaShow Keyboard Shortcut Access Keys in Windows VistaKeyboard Ninja: 21 Keyboard Shortcut Articles TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips VMware Workstation 7 Acronis Online Backup DVDFab 6 Revo Uninstaller Pro Use Flixtime To Create Video Slideshows Creating a Password Reset Disk in Windows Bypass Waiting Time On Customer Service Calls With Lucyphone MELTUP – "The Beginning Of US Currency Crisis And Hyperinflation" Enable or Disable the Task Manager Using TaskMgrED Explorer++ is a Worthy Windows Explorer Alternative

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  • Create Custom Windows Key Keyboard Shortcuts in Windows

    - by Asian Angel
    Nearly everyone uses keyboard shortcuts of some sort on their Windows system but what if you could create new ones for your favorite apps or folders? You might just be amazed at how simple it can be with just a few clicks and no programming using WinKey. WinKey in Action During the installation process you will see this window that gives you a good basic idea of just what can be accomplished with this wonderful little app. As soon as the installation process has finished you will see the “Main App Window”. It provides a simple straightforward listing of all the keyboard shortcuts that it is currently managing. Note: WinKey will automatically add an entry to the “Startup Listing” in your “Start Menu” during installation. To see the regular built-in Windows keyboard shortcuts that it is managing click “Standard Shortcuts” to select it and then click on “Properties”. For those who are curious WinKey does have a “System Tray Icon” that can be disabled if desired. Now onto creating those new keyboard shortcuts… For our example we decided to create a keyboard shortcut for an app rather than a folder. To create a shortcut for an app click on the small “Paper Icon” as shown here. Once you have done that browse to the appropriate folder and select the exe file. The second step will be choosing which keyboard shortcut you would like to associate with that particular app. You can use the drop-down list to choose from a listing of available keyboard combinations. For our example we chose “Windows Key + A”. The final step is choosing the “Run Mode”. There are three options available in the drop-down list…choose the one that best suits your needs. Here is what our example looked like once finished. All that is left to do at this point is click “OK” to finish the process. And just like that your new keyboard shortcut is now listed in the “Main App Window”. Time to try out your new keyboard shortcut! One quick use of our new keyboard shortcut and Iron Browser opened right up. WinKey really does make creating new keyboard shortcuts as simple as possible. Conclusion If you have been wanting to create new keyboard shortcuts for your favorite apps and folders then it really does not get any simpler than with WinKey. This is definitely a recommended app for anyone who loves “get it done” software. Links Download WinKey at Softpedia Similar Articles Productive Geek Tips Show Keyboard Shortcut Access Keys in Windows VistaCreate a Keyboard Shortcut to Access Hidden Desktop Icons and FilesKeyboard Ninja: 21 Keyboard Shortcut ArticlesAnother Desktop Cube for Windows XP/VistaHow-To Geek on Lifehacker: Control Your Computer with Shortcuts & Speed Up Vista Setup TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips DVDFab 6 Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 Recycle ! Find That Elusive Icon with FindIcons Looking for Good Windows Media Player 12 Plug-ins? Find Out the Celebrity You Resemble With FaceDouble Whoa ! Use Printflush to Solve Printing Problems

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  • Java bytecode compiler benchmarks

    - by Dave Jarvis
    Q.1. What free compiler produces the fastest executable Java bytecode? Q.2. What free virtual machine executes Java bytecode the fastest (on 64-bit multi-core CPUs)? Q.3. What other (currently active) compiler projects are missing from this list: http://www.ibm.com/developerworks/java/jdk/ http://gcc.gnu.org/java/ http://openjdk.java.net/groups/compiler/ http://java.sun.com/javase/downloads/ http://download.eclipse.org/eclipse/downloads/ Q.4. What performance improvements can compilers do that JITs cannot (or do not)? Q.5. Where are some recent benchmarks, comparisons, or shoot-outs (for Q1 or Q2)? Thank you!

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  • Writing a VM - well formed bytecode?

    - by David Titarenco
    Hi, I'm writing a virtual machine in C just for fun. Lame, I know, but luckily I'm on SO so hopefully no one will make fun :) I wrote a really quick'n'dirty VM that reads lines of (my own) ASM and does stuff. Right now, I only have 3 instructions: add, jmp, end. All is well and it's actually pretty cool being able to feed lines (doing it something like write_line(&prog[1], "jmp", regA, regB, 0); and then running the program: while (machine.code_pointer <= BOUNDS && DONE != true) { run_line(&prog[machine.cp]); } I'm using an opcode lookup table (which may not be efficient but it's elegant) in C and everything seems to be working OK. My question is more of a "best practices" question but I do think there's a correct answer to it. I'm making the VM able to read binary files (storing bytes in unsigned char[]) and execute bytecode. My question is: is it the VM's job to make sure the bytecode is well formed or is it just the compiler's job to make sure the binary file it spits out is well formed? I only ask this because what would happen if someone would edit a binary file and screw stuff up (delete arbitrary parts of it, etc). Clearly, the program would be buggy and probably not functional. Is this even the VM's problem? I'm sure that people much smarter than me have figured out solutions to these problems, I'm just curious what they are!

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  • Windows 8 RTM ‘Keyboard Shortcuts’ Super List

    - by Asian Angel
    Now that Windows 8 RTM has been out for a bit you may be wondering about all of the new keyboard shortcuts associated with the system. Yash Tolia from the MSDN blog has put together a super list of all the keyboard shortcuts you could ever want into one awesome post. A quick copy, paste, and save/print using your favorite word processing program will help keep this terrific list on hand for easy reference whenever you need it! List of Windows 8 Shortcuts [Nirmal TV] HTG Explains: What The Windows Event Viewer Is and How You Can Use It HTG Explains: How Windows Uses The Task Scheduler for System Tasks HTG Explains: Why Do Hard Drives Show the Wrong Capacity in Windows?

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  • Use Those Extra Mouse Buttons to Increase Efficiency

    - by Mark Virtue
    Did you know that the most commonly used mouse actions are clicking a window’s “Close” button (the X in the top-right corner), and clicking the “Back” button (in a browser and various other programs)?  How much time do you spend every day locating the Close button or the Back button with your mouse so that you can click on them?  And what about that mouse you’re using – how many buttons does it have, besides the two main ones?  Most mouses these days have at least four (including the scroll-wheel, which a lot of people don’t realize is also a button as well).  Why not assign those extra buttons to your most common mouse actions, and save yourself a bundle of mousing-around time every day? If your mouse was manufactured by one of the “premium” mouse manufacturers (Microsoft, Logitech, etc), it almost certain came with driver software to allow you to customize your mouse’s controls and take advantage of your mouse’s special features.  Microsoft, for example, provides driver software called IntelliPoint (link below), while Logitech provides SetPoint.  It’s possible that your mouse has some extra buttons but doesn’t come with its own driver software (the author is using a Microsoft Bluetooth Notebook Mouse 5000, which amazingly is not supported by the Microsoft IntelliPoint software!).  If your mouse falls into this category, you can use a marvelous free product called X-Mouse Button Control, from Highresolution Enterprises (link below).  It provides a truly amazing array of mouse configuration options, including assigning actions to buttons on a per-application basis. Once X-Mouse Button Control is downloaded, its setup process is quite straightforward. Once downloaded, you can start the program via Start / Highresolution Enterprises / X-Mouse Button Control.  You will find the program’s icon in the system tray: Right-click on the icon and select Setup from the pop-up menu.  The program’s configuration window appears: It’s extremely unlikely that we will want to change the functionality of our mouse’s two main buttons (left and right), so instead we’ll look at the rest of the options on the right side of the window.  The Middle Button refers to either the third, middle button (found on some old mouses), or the pressing of the wheel itself, as a button (if you didn’t know you could press your wheel like a button, try it out now).  Mouse Button 4 and Mouse Button 5 usually refer to the extra buttons found on the side of the mouse, often near your thumb. So what can we use these extra mouse buttons for?  Well, clearly Close and Back are two obvious candidates.  Each of these can be found by selecting them from the drop-down menu next to each button field: Once the two options are chosen, the window will look something like this: If you’re not interested in choosing Back or Close, you may like to try some of the other options in the list, including: Cut, Copy and Paste Undo Show the Desktop Next/Previous track (for media playback) Open any program Simulate any keystroke or combination of keystrokes ….and many other options.  Explore the drop-down list to see them all. You may decide, for example, that closing the current document (as opposed to the current program) would be a good use for Mouse Button 5.  In other words, we need to simulate the keypress of Ctrl-F4.  Let’s see how we achieve this. First we select Simulated Keystrokes from the drop-down list: The Simulated Keystrokes window opens: The instructions on the page are pretty comprehensive.  If you want to simulate the Ctrl-F4 keystroke, you need to type {CTRL}{F4} into the box: …and then click OK. Assigning Actions to Buttons on a Per-Application Basis One of the most powerful features of X-Mouse Button Control is the ability to assign actions to buttons on a per-application basis.  This means that if we have a particular program open, then our mouse will behave differently – our buttons will do different things. For example, when we have Windows Media Player open, for example, we may wish to have buttons assigned to Play/Pause, Next track and Previous track, as well as changing the volume with the mouse!  This is easy with X-Mouse Button Control.  We start by opening Windows Media Player.  This makes the next step easier.  Then we return to X-Mouse Button Control and add a new “configuration”.  This is done by clicking the Add button: A window opens containing a list of all running programs, including our recently opened Windows Media Player: We select Windows Media Player and click OK.  A new, blank “configuration” is created: We repeat the earlier steps to assign buttons to Play/Pause, Next track and Previous track, and assign scrolling the wheel to alter the volume:   To save all our changes and close the window, we click Apply. Now spend a few minutes thinking of all the applications you use the most, and what are the most common simple tasks you perform in each of those applications.  Those tasks are then perfect candidates for per-application button assignments. There are many more configuration options and capabilities of X-Mouse Button Control – too many to list here.  We encourage you to spend a bit of time exploring the Setup window.  Then, most important of all, don’t forget to use your new mouse buttons!  Get into the habit of using them, and then after a while you’ll start to wonder how you ever tolerated the laborious, tedious, time-consuming process of actually locating each window’s Close button… Download X-Mouse Button Control Highresolution Enterprise Similar Articles Productive Geek Tips Add Specialized Toolbar Buttons to Firefox the Easy WayBoost Your Mouse Pointing Accuracy in WindowsMake Mouse Navigation Faster in WindowsVista Style Popup Previews for Firefox TabsStupid Geek Tricks: Using the Quick Zoom Feature in Outlook TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips DVDFab 6 Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 Download Videos from Hulu Pixels invade Manhattan Convert PDF files to ePub to read on your iPad Hide Your Confidential Files Inside Images Get Wildlife Photography Tips at BBC’s PhotoMasterClasses Mashpedia is a Real-time Encyclopedia

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  • Help Prevent Carpal Tunnel Problems with Workrave

    - by Matthew Guay
    Whether for work or leisure, many of us spend entirely too much time on the computer everyday.  This puts us at risk of having or aggravating Carpal Tunnel problems, but thanks to Workrave you can help to divert these problems. Workrave helps Carpal Tunnel problems by reminding you to get away from your computer periodically.  Breaking up your computer time with movement can help alleviate many computer and office related health problems.  Workrave helps by reminding you to take short pauses after several minutes of computer use, and longer breaks after continued use.  You can also use it to keep from using the computer for too much You time in a day.  Since you can change the settings to suit you, this can be a great way to make sure you’re getting the breaks you need. Install Workrave on Windows If you’re using Workrave on Windows, download (link below) and install it with the default settings. One installation setting you may wish to change is the startup.  By default Workrave will run automatically when you start your computer; if you don’t want this, you can simply uncheck the box and proceed with the installation. Once setup is finished, you can run Workrave directly from the installer. Or you can open it from your start menu by entering “workrave” in the search box. Install Workrave in Ubuntu If you wish to use it in Ubuntu, you can install it directly from the Ubuntu Software Center.  Click the Applications menu, and select Ubuntu Software Center. Enter “workrave” into the search box in the top right corner of the Software Center, and it will automatically find it.  Click the arrow to proceed to Workrave’s page. This will give you information about Workrave; simply click Install to install Workrave on your system. Enter your password when prompted. Workrave will automatically download and install.   When finished, you can find Workrave in your Applications menu under Universal Access. Using Workrave Workrave by default shows a small counter on your desktop, showing the length of time until your next Micro break (30 second break), Rest break (10 minute break), and max amount of computer usage for the day. When it’s time for a micro break, Workrave will popup a reminder on your desktop. If you continue working, it will disappear at the end of the timer.  If you stop, it will start a micro-break which will freeze most on-screen activities until the timer is over.  You can click Skip or Postpone if you do not want to take a break right then. After an hour of work, Workrave will give you a 10 minute rest break.  During this it will show you some exercises that can help eliminate eyestrain, muscle tension, and other problems from prolonged computer usage.  You can click through the exercises, or can skip or postpone the break if you wish.   Preferences You can change your Workrave preferences by right-clicking on its icon in your system tray and selecting Preferences. Here you can customize the time between your breaks, and the length of your breaks.  You can also change your daily computer usage limit, and can even turn off the postpone and skip buttons on notifications if you want to make sure you follow Workrave and take your rests! From the context menu, you can also choose Statistics.  This gives you an overview of how many breaks, prompts, and more were shown on a given day.  It also shows a total Overdue time, which is the total length of the breaks you skipped or postponed.  You can view your Workrave history as well by simply selecting a date on the calendar.   Additionally, the Activity tab in the Statics pane shows more info about your computer usage, including total mouse movement, mouse button clicks, and keystrokes. Conclusion Whether you’re suffering with Carpal Tunnel or trying to prevent it, Workrave is a great solution to help remind you to get away from your computer periodically and rest.  Of course, since you can simply postpone or skip the prompts, you’ve still got to make an effort to help your own health.  But it does give you a great way to remind yourself to get away from the computer, and especially for geeks, this may be something that we really need! Download Workrave Similar Articles Productive Geek Tips Switch to the Dvorak Keyboard Layout in XPAccess Your MySQL Server Remotely Over SSHHow to Secure Gaim Instant Messenger traffic at Work with SecureCRT and SSHConnect to VMware Server Console Over SSHDisclaimers TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 PCmover Professional StockFox puts a Lightweight Stock Ticker in your Statusbar Explore Google Public Data Visually The Ultimate Excel Cheatsheet Convert the Quick Launch Bar into a Super Application Launcher Automate Tasks in Linux with Crontab Discover New Bundled Feeds in Google Reader

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  • 42+ Text-Editing Keyboard Shortcuts That Work Almost Everywhere

    - by Chris Hoffman
    Whether you’re typing an email in your browser or writing in a word processor, there are convenient keyboard shortcuts usable in almost every application. You can copy, select, or delete entire words or paragraphs with just a few key presses. Some applications may not support a few of these shortcuts, but most applications support the majority of them. Many are built into the standard text-editing fields on Windows and other operating systems. Image Credit: Kenny Louie on Flickr HTG Explains: Why You Only Have to Wipe a Disk Once to Erase It HTG Explains: Learn How Websites Are Tracking You Online Here’s How to Download Windows 8 Release Preview Right Now

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  • Nhibernate.Bytecode.Castle Trust Level on IIS

    - by jack london
    Trying to deploy the wcf service, depended on nhibernate. And getting the following exception On Reflection activator. [SecurityException: That assembly does not allow partially trusted callers.] System.Security.CodeAccessSecurityEngine.ThrowSecurityException(Assembly asm, PermissionSet granted, PermissionSet refused, RuntimeMethodHandle rmh, SecurityAction action, Object demand, IPermission permThatFailed) +150 System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck) +0 System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache) +86 System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache) +230 System.Activator.CreateInstance(Type type, Boolean nonPublic) +67 NHibernate.Bytecode.ActivatorObjectsFactory.CreateInstance(Type type) +8 NHibernate.Driver.ReflectionBasedDriver.CreateConnection() +28 NHibernate.Connection.DriverConnectionProvider.GetConnection() +56 NHibernate.Tool.hbm2ddl.SchemaExport.Execute(Action`1 scriptAction, Boolean export, Boolean justDrop) +376 in IIS configuration service's trust level is Full-trust also application's web config's trust level is full. how could i make this service in working state?

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  • Should I amortize scripting cost via bytecode analysis or multithreading?

    - by user18983
    I'm working on a game sort of thing where users can write arbitrary code for individual agents, and I'm trying to decide the best way to divide up computation time. The simplest option would be to give each agent a set amount of time and skip their turn if it elapses without an action being decided upon, but I would like people to be able to write their agents decision functions without having to think too much about how long its taking unless they really want to. The two approaches I'm considering are giving each agent a set number of bytecode instructions (taking cost into account) each timestep, and making players deal with the consequences of the game state changing between blocks of computation (as with Battlecode) or giving each agent it's own thread and giving each thread equal time on the processor. I'm about equally knowledgeable on both concurrency and bytecode stuff, which is to say not very, so I'm wondering which approach would be best. I have a clearer idea of how I'd structure things if I used bytecode, but less certainty about how to actually implement the analysis. I'm pretty sure I can work up a concurrency based system without much trouble, but I worry it will be messier with more overhead and will add unnecessary complexity to the project.

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  • How does Google App Engine precompile Java ?

    - by Thilo
    App Engine uses a "precompilation" process with the Java bytecode of an app to enhance the performance of the app in the Java runtime environment. Precompiled code functions identically to the original bytecode. Is there any detailed information what this does?

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  • C++ to bytecode compiler for CLR?

    - by paleozogt
    I'd like to be able to compile a C++ library so that it runs within a managed runtime in the CLR. There are several tools for doing this with the JVM (NestedVM, LLJVM, etc) but I can't seem to find any for the CLR. Has anyone tried doing this?

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  • C++ to bytecode compiler for Silverlight CLR?

    - by paleozogt
    I'd like to be able to compile a C/C++ library so that it runs within a safe managed runtime in the Silverlight CLR. There are several tools for doing this with the JVM that allows C++ code to run within a CRT emulation layer (see NestedVM, LLJVM, etc), which effectively allows C++ code to be run within a Java Applet. There's even a tool for this for the Adobe Flash VM (see Alchemy). However, I can't seem to find any tools like this for the CLR. fyi, the MSVC tools don't seem to allow for this: The /clr:pure flag will create C++ code that runs in the CLR, but it isn't safe (because the CRT isn't safe) and /clr:safe requires massive code changes (no native types, etc).

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  • JAVA bytecode optimization

    - by Idob
    This is a basic question. I have code which shouldn't run on metadata beans. All metadata beans are located under metadata package. Now, I use reflection API to find out whether a class is located in the the metadata package. if (newEntity.getClass().getPackage().getName().contains("metadata")) I use this If in several places within this code. The question is: Should I do this once with: boolean isMetadata = false if (newEntity.getClass().getPackage().getName().contains("metadata")) { isMetadata = true; } C++ makes optimizations and knows that this code was already called and it won't call it again. Does JAVA makes optimization? I know reflection API is a beat heavy and I prefer not to lose expensive runtime.

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  • Does Java support dynamic method invocation?

    - by eSKay
    class A { void F() { System.out.println("a"); }} class B extends A { void F() { System.out.println("b"); }} public class X { public static void main(String[] args) { A objA = new B(); objA.F(); } } Here, F() is being invoked dynamically, isn't it? This article says ... the Java bytecode doesn’t support dynamic method invocation. There are three supported invocations modes : invokestatic, invokespecial, invokeinterface or invokevirtual. These modes allows to call methods with known signature. We talk of strongly typed language. This allows to to make some checks directly at compile time. On the other side, the dynamic languages use dynamic types. So we can call a method unknown at the compile time, but that’s completely impossible with the Java bytecode. What am I missing?

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  • Statically checking a Java app for link errors

    - by monorailkitty
    I have a scenario where I have code written against version 1 of a library but I want to ship version 2 of the library instead. The code has shipped and is therefore not changeable. I'm concerned that it might try to access classes or members of the library that existed in v1 but have been removed in v2. I figured it would be possible to write a tool to do a simple check to see if the code will link against the newer version of the library. I appreciate that the code may still be very broken even if the code links. I am thinking about this from the other side - if the code won't link then I can be sure there is a problem. As far as I can see, I need to run through the bytecode checking for references, method calls and field accesses to library classes then use reflection to check whether the class/member exists. I have three-fold question: (1) Does such a tool exist already? (2) I have a niggling feeling it is much more complicated that I imagine and that I have missed something major - is that the case? (3) Do you know of a handy library that would allow me to inspect the bytecode such that I can find the method calls, references etc.? Thanks!

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