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• Service Level Loggin/Tracing

  - by Ahsan Alam

  We all love to develop services, right? First timers want to learn technologies like WCF and Web Services. Some simply want to build services; whereas, others may find services as natural architectural decision for particular systems. Whatever the reason might be, services are commonly used in building wide range of systems. Developers often encapsulates various functionality (small or big) within one or more services, and expose them for multiple applications. Sometimes from day one (and definitely over time) these services may evolve into a set of black boxes. Services or not, black boxes or not, issues and exceptions are sometimes hard to avoid, especially in highly evolving and transactional systems. We can try to be methodical with our unit testing, QA and overall process; but we may not be able to avoid some type of system issues. When issues arise from one or more highly transactional services, it becomes necessary to resolve them very quickly. When systems handle thousands of transaction in matter of hours, some issues may not surface immediately. That is when service level logging becomes very useful. Technologies such as WCF, allow us to enable service level tracing with minimal effort; but that may not provide us with complete picture. Developers may need to add tracing within critical areas of the code with various degrees of verbosity. Programmer can always utilize some logging framework such as the 'Logging Application Block' to get the job done. It may seem overkill sometimes; but I have noticed from my experience that service level logging helps programmer trace many issues very quickly.

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• Level Creating Help

  - by Brandon oubiub

  I am making a little 2d overhead RPG type game just for fun. I have almost all the basic stuff set up, but I just need a little help on level creation. I can already make a level and place each tile how I want it, but having to place each tile gets annoying after a while. I noticed that in a lot of games, even extremely simple ones, they have LOTS of levels with LOTS of tiles in each. Creating all that in this fashion would take forever. So I guess my question is, as a game developer, am I supposed to do all that, or maybe make a little level editor so I can see things as I create it? What do game developers do? I'm using Java. EDIT: Okay, say if I had an image for a map, that I made in MS paint or photoshop, and each pixel represent a tile value, could I somehow in Java detect what color an individual pixel is? If so, that would be perfect. If so, how?

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• @staticmethod vs module-level function

  - by darkfeline

  This is not about @staticmethod and @classmethod! I know how staticmethod works. What I want to know is the proper use cases for @staticmethod vs. a module-level function. I've googled this question, and it seems there's some general agreement that module-level functions are preferred over static methods because it's more pythonic. Static methods have the advantage of being bound to its class, which may make sense if only that class uses it. However, in Python functionality is usually organized by module not class, so usually making it a module function makes sense too. Static methods can also be overridden by subclasses, which is an advantage or disadvantage depending on how you look at it. Although, static methods are usually "functionally pure" so overriding it may not be smart, but it may be convenient sometimes (though this may be one of those "convenient, but NEVER DO IT" kind of things only experience can teach you). Are there any general rule-of-thumbs for using either staticmethod or module-level functions? What concrete advantages or disadvantages do they have (e.g. future extension, external extension, readability)? If possible, also provide a case example.

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• How do you handle browser cache with login/logout?

  - by Julien

  To improve performances, I'd like to add a fairly long Cache-Control (up to 30 minutes) to each page since they do not change often. However, each page also displays the name of the user logged in (like this website). The problem is when the user logs in or logs out: the user name must change. How can I change the user name after each login/logout action while keeping a long Cache-Control? Here are the solutions I can think of: Ajax request (not cached) to retrieve and display the user name. If I have 2 requests (/user?registered and /user?new), they could be cached as well. But I am afraid this extra request would nullify my caching performance-wise Add a unique URL variable (?time=) to make the URL different, and cancel the cache. However, I would have to add this variable to all links on my webpage, not very convenient code-wise This problems becomes greater if I actually have more content that is not the same for registered users and new users.

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• Google Chrome does not honor cache-policy in page header if the page is displayed in a FRAME

  - by Tim

  No matter what I do: <meta http-equiv="Cache-Control" content="no-cache" /> <meta http-equiv="Expires" content="Fri, 30 Apr 2010 11:12:01 GMT" /> <meta http-equiv="Expires" content="0" /> <HTTP-EQUIV="PRAGMA" CONTENT="NO-STORE" /> Google Chrome does not reload any page according to the page's internal cache policy if the page is displayed in a frame. It is as though the meta tags are not even there. Google Chrome seems to be ignoring these tags. Since I've gotten answers to this question on other forums where the person responding has ignored the operative condition, I will repeat it: this behavior occurs when the page is displayed in a frame. I was using the latest released version and have since upgraded to 5.0.375.29 beta but the behavior is the same in both versions. Would someone please care to confirm one way or another the behavior you are seeing with framesets and the caching/expiration policies given in meta tags? Thanks

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• Optimal ASP.Net cache duration for a large site?

  - by HeroicLife

  I've read lots of material on how to do ASP.Net caching but little on the optimal duration that pages should be cached for. Let's say that I have a popular site with 50,000 pages. The content does not change frequently, so I could cache pages for up to an hour if I wanted. The server has 16 GB of RAM, but database connections are limited. How long should pages be cached for? My thinking is that if I set the cache duration too high (let's say 60 minutes), I will fill up memory with a fraction of the total content, which will continually be shuffled in and out of memory. Furthermore, let's say that 10% of the pages are responsible for 90% of traffic. If the popular pages are hit every second, and the unpopular ones every hour, then a 60 second cache would only keep the load-intensive content cached without sacrificing freshness. Should numerous but rarely-accessed content be cached at all?

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• How can I cache a Subversion password on a server, without storing it in unencrypted form?

  - by Zilk

  My Subversion server only provides access via HTTPS; support for svn+ssh has been dropped because we wanted to avoid creating system users on that machine just for SVN access. Now I'm trying to provide a way for users to cache their passwords for a while, without leaving them stored on the filesystem in unencrypted form. This is no problem for Gnome or KDE users, because they can use gnome-keyring and kwallet, respectively. IIRC, TortoiseSVN has a similar caching mechanism, too. But what about users on a non-GUI system? Some context: in this case, we have a development/testing server where one project has been checked out into the Apache htdocs directory. Development for this project is almost complete, and only minor text/layout changes are performed directly on this server. Nevertheless, the changes should be checked into the repository. There's no kwallet and no gnome-keyring on this system, and the ssh-agent can't help because the repository is accessed via https instead of svn+ssh. As far as I know, that leaves them the choice of entering the password every time they talk to the SVN server, or storing it in an insecure way. Is there any way to get something like what gnome-keyring and kwallet provide in a non-GUI environment?

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• Entity Framework Code First: Get Entities From Local Cache or the Database

  - by Ricardo Peres

  Entity Framework Code First makes it very easy to access local (first level) cache: you just access the DbSet<T>.Local property. This way, no query is sent to the database, only performed in already loaded entities. If you want to first search local cache, then the database, if no entries are found, you can use this extension method: 1: public static class DbContextExtensions 2: { 3: public static IQueryable<T> LocalOrDatabase<T>(this DbContext context, Expression<Func<T, Boolean>> expression) where T : class 4: { 5: IEnumerable<T> localResults = context.Set<T>().Local.Where(expression.Compile()); 6:  7: if (localResults.Any() == true) 8: { 9: return (localResults.AsQueryable()); 10: } 11:  12: IQueryable<T> databaseResults = context.Set<T>().Where(expression); 13:  14: return (databaseResults); 15: } 16: }

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• Des chercheurs découvrent le premier malware à pratiquer l'overwrite, caché sous la forme d'un Adobe

  Des chercheurs découvrent le premier malware à pratiquer l'overwrite, caché sous la forme d'un Adobe Updater Un code malicieux vient d'être repéré pour la première fois par des spécialistes en sécurité informatique. En effet, des chercheurs viennent de découvrir un malware qui se substitue aux mises à jour de certaines applications. Habituellement, ce type de programmes ne pratique pas l'overwrite. Seuls les ordinateurs tournant sous Windows sont touchés. Le malware se cache sous la forme d'un updater pour les produits Adobe ou Java. Une variante imite Adobe Reader v.9 et overwrite AdobeUpdater.exe, lequel a pour mission de se connecter régulièrement auprès des serveurs d'Adobe pour vérifier si une nouvelle version ...

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• How do I speed up and cache mmap file access over NFS on Linux?

  - by Zan Lynx

  The server and client are both 64-bit Ubuntu 10.04 LTS. The application in question is a custom app that uses mmap() for fast random file access. Its ideal state is when the entire file is cached in RAM. The network connections are really fast 10Gb Ethernet. It is a virtual server blade setup. It isn't the network connections slowing things down because everything performs superbly when using a virtual disk (iSCSI to the SAN). But when we run the application on a NFS home directory mount, performance goes to the dogs. It appears that the Linux kernel isn't caching anything. So it is reading every single disk block needed by mmap() accesses over and over and over again. The NFS mount is done through autofs, which has only default settings. /proc/mounts shows the NFS mount is done with the following options: rw,relatime,vers=3,rsize=131072,wsize=131072,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.11.52,mountvers=3,mountproto=tcp,addr=192.168.11.52 How can I make Ubuntu 10.04 cache the file instead of reloading it all the time?

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• Tagging Objects in the AppFabric Cache

  In two of my previous entries I outlined functionality and patterns used in the AppFabric Cache.  In this entry I wanted to expand and look at another area of functionality that people have come to expect when working with cache technology.  This expectation is the ability to tag content with more information than just the key.  As you start to examine this expectation you will soon find yourself asking if the tagged data can be related to each other and finally if it is possible...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Skipping nginx PHP cache for certain areas of a site?

  - by DisgruntledGoat

  I have just set up a new server with nginx (which I am new to) and PHP. On my site there are essentially 3 different types of files: static content like CSS, JS, and some images (most images are on an external CDN) main PHP/MySQL database-driven website which essentially acts like a static site dynamic PHP/MySQL forum It is my understanding from this question and this page that the static files need no special treatment and will be served as fast as possible. I followed the answer from the above question to set up caching for PHP files and now I have a config like this: location ~ \.php$ { try_files $uri =404; fastcgi_cache one; fastcgi_cache_key $scheme$host$request_uri; fastcgi_cache_valid 200 302 304 30m; fastcgi_cache_valid 301 1h; include /etc/nginx/fastcgi_params; fastcgi_pass unix:/var/run/php-fastcgi/php-fastcgi.socket; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /srv/www/example$fastcgi_script_name; fastcgi_param HTTPS off; } However, now I want to prevent caching on the forum (either for everyone or only for logged-in users - haven't checked if the latter is feasible with the forum software). I've heard that "if is evil" inside location blocks, so I am unsure how to proceed. With the if inside the location block I would probably add this in the middle: if ($request_uri ~* "^/forum/") { fastcgi_cache_bypass 1; } # or possible this, if I'm able to cache pages for anonymous visitors if ($request_uri ~* "^/forum/" && $http_cookie ~* "loggedincookie") { fastcgi_cache_bypass 1; } Will that work fine, or is there a better way to achieve this?

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• "Cache Payback"

  Put performance in your pocket with the client result cache.

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• How to delete Chrome temp data (history, cookies, cache) using command line

  - by Dio Phung

  On Windows 7, I tried running this script but still cannot clear Chrome temp data. Can someone figure out what's wrong with the script? Where do Chrome store history and cache ? Thanks ECHO -------------------------------------- ECHO **** Clearing Chrome cache taskkill /F /IM "chrome.exe">nul 2>&1 set ChromeDataDir=C:\Users\%USERNAME%\AppData\Local\Google\Chrome\User Data\Default set ChromeCache=%ChromeDataDir%\Cache>nul 2>&1 del /q /s /f "%ChromeCache%\*.*">nul 2>&1 del /q /f "%ChromeDataDir%\*Cookies*.*">nul 2>&1 del /q /f "%ChromeDataDir%\*History*.*">nul 2>&1 set ChromeDataDir=C:\Users\%USERNAME%\Local Settings\Application Data\Google\Chrome\User Data\Default set ChromeCache=%ChromeDataDir%\Cache>nul 2>&1 del /q /s /f "%ChromeCache%\*.*">nul 2>&1 del /q /f "%ChromeDataDir%\*Cookies*.*">nul 2>&1 del /q /f "%ChromeDataDir%\*History*.*">nul 2>&1 ECHO **** Clearing Chrome cache DONE

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• AppFabric named cache, what happens if you lose a cache host?

  - by Liam

  I'm getting my head around how app fabric clustering works and there's something I'm not sure about. Given a structure where we have one named cache, with two lead hosts and (say) three cache hosts and high availability turned off and the lead host(s) performing the management role. When one cache host goes down do you loose the data that was on that cache host? In this MSDN article it states: Data on the non-lead hosts would be lost (assuming high availability was not enabled), but the rest of the cluster could continue serving and storing data But I was unsure if redundancy is built into the system. Would you loose x amount of data or would one of the other cache hosts store this data also and pick up the slack?

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• How to detect page zoom level in all modern browsers?

  - by understack

  How can I detect page zoom level in all modern browsers? While this thread tells how to do it in IE7 and IE8, I can't find good solution for FF, Safari and Chrome. For FF one of the suggested solution FF stores page zoom level for future. So on first page load would I be able to get zoom level? Somewhere I read it works if you're changing zoom level on that page after its loaded. Is there a way to trap 'zoom' event? I need this because some of my calculations are based on no of pixels and they get changed on Zoom. Thanks. Modified sample given by tfl. This would alert different height based on zoom level. <html> <head> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.1/jquery.min.js" type="text/javascript"/></script> <title></title> </head> <body> <div id="xy" style="border:1px solid #f00; width:100px;"> Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque sollicitudin tortor in lacus tincidunt volutpat. Integer dignissim imperdiet mollis. Suspendisse quis tortor velit, placerat tempor neque. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Praesent bibendum auctor lorem vitae tempor. Nullam condimentum aliquam elementum. Nullam egestas gravida elementum. Maecenas mattis molestie nisl sit amet vehicula. Donec semper tristique blandit. Vestibulum adipiscing placerat mollis. </div> <div> <button onclick="alert($('#xy').height());">Show</button> </div> </body> </html>

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• Infinispan equivalent to ehcache's copyOnRead and copyOnWrite

  - by waxwing

  Hi, I am planning to implement a cache solution into an existing web app. Nothing complicated: basically a concurrent map that supports overflowing to disk and automatic eviction. Clustering the cache could be requirement in the future, but not now. I like ehcache's copyOnRead and copyOnWrite features, because it means that I don't have to manually clone things before modifying something I take out of the cache. Now I have started to look at Infinispan, but I have not found anything equivalent there. Does it exist? I.e., the following unit tests should pass: @Test public void testCopyOnWrite() { Date date = new Date(0); cache.put(0, date); date.setTime(1000); date = cache.get(0); assertEquals(0, date.getTime()); } @Test public void testCopyOnRead() { Date date = new Date(0); cache.put(0, date); assertNotSame(cache.get(0), cache.get(0)); }

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• Java Caching on distributed environment

  - by Naren

  Hi, I am supposed to create a simple replicated cache using java for internal purpose which will be used in a distributed environment. I have seen oracle has implemented Replicated Cache Service. http://wiki.tangosol.com/display/COH32UG/Replicated+Cache+Service The problem I am facing is while doing an update or remove, I acquire lock on other cache's to the point the cache get's updated and notifies others of the change. This is eventually going into a dead lock situation, while removing. Is there any strategy I should follow while updating or removing from cache's. Can I implement a replicated cache without having a primary cache?? Thanks, Naren

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• wanting a good memory + disk caching solution

  - by brofield

  I'm currently storing generated HTML pages in a memcached in-memory cache. This works great, however I am wanting to increase the storage capacity of the cache beyond available memory. What I would really like is: memcached semantics (i.e. not reliable, just a cache) memcached api preferred (but not required) large in-memory first level cache (MRU) huge on-disk second level cache (main) evicted from on-disk cache at maximum storage using LRU or LFU proven implementation In searching for a solution I've found the following solutions but they all miss my marks in some way. Does anyone know of either: other options that I haven't considered a way to make memcachedb do evictions Already considered are: memcachedb best fit but doesn't do evictions: explicitly "not a cache" can't see any way to do evictions (either manual or automatic) tugela cache abandoned, no support don't want to recommend it to customers nmdb doesn't use memcache api new and unproven don't want to recommend it to customers

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• Create Second Web Application using the Default port 80 In SharePoint2010

  - by ybbest

  As a SharePoint developer, one of the common tasks is to create SharePoint Web Application. In this post I will show you how to create second Web Application using the default port 80 in SharePoint2010.You need to follow the steps below. 1. Go to Central Admin => Application Management =>Manage web applications and click new Web Application 2. I choose YBBEST as my IIS site name and host header name, change the port number to 80 and leave the rest settings as default. 3. After the web application creation wizard completes, add an entry in the host file located at C:\Windows\System32\Drivers\etc\hosts . 4. Create a root site collection for the new web application. After the site collection is created , you can browse to the site collection using URL http://ybbest.

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• Pyglet: How to use second screen's vsync

  - by BaldDude

  does anybody know if it's possible to use the vsync of the second monitor instead of the first one with pyglet? I have 2 monitors, one running at 60Hz and the other at 120Hz. I want to be able to set my application on whatever monitors I have, and have the application use the monitor's rate to swap the buffers. This needs to be cross platform. I found this information... pyglet.window But I was wondering if anybody knows a way... Thanks for your help.

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• USB install from second internal hard drive in a MacBook Pro

  - by aaron.anderson

  I am trying to install Ubuntu (among others) on a second internal hard drive on my MacBook Pro. I have an 80 GB internal SSD with OS X on it, along with a 750 GB internal HD with a few partitions, one of which being for Ubuntu. I currently have rEFInd installed for switching between the OS's. I was wondering how one would go about installing Ubuntu from the USB install stick. I have followed the instructions on creating a bootable USB. Once this is bootable, could I just hold the Option key on startup, and it should appear in the menu? Or am I missing something?

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• Switching from Java/Java EE career path to C POS path?

  - by Muhammad

  I am a Java/Java EE Developer with about 3 years in this field. I like low-level programming so much... I favor back-end code over front-end. I've a knowledge in C and know little about C++. I got an offer to work with C in Point-of-Sale Payment terminals. I don't know much about how POS works (IDE/toolsets, etc). although I have a payment experience (ISO8583, etc...) I need you own opinion from Switching from the Java's High-level world to POS low-level world Although I love low-level world, but I am afraid from not being found what I seek.. I know programmers are not measured by the tools they use (including prog. langs.) but with their minds. I need your opinions of: Is programming POS terminals in C is an interesting thing, or I'll find myself doing usual code-writing job? (especially I am about to switch my whole career path). I find myself writing an elegant code in Java (like: Sobat http://code.google.com/p/sobat/) a code where I find myself in... So do I'll find the same thing in POS C? or It will all about Libraries that I'll call to finish my work?! Lastly, does this thing worse adventure with my current career (stability, conference, etc.. )? (as I currently don't think to move to a new job) Thanks.

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• Intel graphics Ubuntu 12.04.3 LTS: does not detect second monitor

  - by user206551

  I have some problems to get the second monitor working on my Ubuntu 12.04.3 LTS. If I click on the detect button it does not work. Info about my system: $uname -a Linux LabTop2 3.8.0-32-generic #47~precise1-Ubuntu SMP Wed Oct 2 16:22:28 UTC 2013 i686 i686 i386 GNU/Linux $cat /etc/*-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=12.04 DISTRIB_CODENAME=precise DISTRIB_DESCRIPTION="Ubuntu 12.04.3 LTS" NAME="Ubuntu" VERSION="12.04.3 LTS, Precise Pangolin" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu precise (12.04.3 LTS)" VERSION_ID="12.04" $lspci |grep VGA 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) $lsmod | grep video uvcvideo 72250 0 videobuf2_core 39385 1 uvcvideo videodev 96131 2 uvcvideo,videobuf2_core videobuf2_vmalloc 12920 1 uvcvideo videobuf2_memops 13042 1 videobuf2_vmalloc video 19116 1 i915 $xrandr -q xrandr: Failed to get size of gamma for output default Screen 0: minimum 1366 x 768, current 1368 x 768, maximum 1368 x 768 default connected 1368x768+0+0 0mm x 0mm 1366x768 0.0 1368x768 0.0* Before upgrading the system, xrand -q showed my much more resolution options and the other monitor. I have tried to install intel-linux-graphics-installer but this version of ubuntu is not supported Any help will be apreciated!!

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• How to take a screenshot every n second?

  - by Seppo Erviälä

  What software can I use to take screenshots with a set interval? I'd like to take screenshots every 2 second or so. Command-line and GUI are both ok. I'd prefer software that can also resize and compress each screenshot. EDIT: What I realized I really wanted to do was take a screenshot and a picture with webcam at the same time. I ended up doing some python: import threading import os def capture(i): i += 1 threading.Timer(2.0, printit, [i]).start() fill = str(i).zfill(5) os.system("scrot scrot-%s.jpg" % fill) os.system("streamer -o streamer-%s.jpeg -s 320x240 -j 100" % fill) capture(0)

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