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• ASP.NET Web Service

  - by Sreerag

  Why doesn't a ASP.NET web method allow default parameters ?

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• How many WCF connections can a single host handle?

  - by mafutrct

  I'll try to explain this with an example. I'm writing a chat application. There are users that can join chat rooms. A user has to log in before he can join any room. Currently, there is a single service. A user logs in using this service. Then, the user sends and receives messages for all joined rooms via this single service. channel.Login("Hans Moleman", "password"); channel.JoinRoom("name of room"); channel.SendChat("name of room", "hello"); I'm thinking about changing the design so there is a new WCF connection for each joined room. In the actual app, the number of connections is likely going to be in the range of 10-100, possibly more. Is this a good idea? Or are ~100 connections per client too much? The server should be able to handle many clients (range 100-1000, later up to 10k). In case it matters, I'm using NetTcpBinding.

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• How do I design a .NET (C#) for a program that needs to run as a Windows service but also have a web

  - by hjoelr

  I am designing a piece of software that needs to operate different pieces of hardware based mainly on a schedule but it also needs to have a web interface for configuring settings, configuring the schedule, and possibly even manually controlling the hardware. I'm not sure how to design the architecture of software like this. One thought that I have had was to create a Windows service that does the communication with the hardware as well as "publishing" web services through WCF and then having an ASP.NET application that then controls the Windows service through WCF. This approach seems to be a lot of work for what I'm trying to accomplish. Could someone please give me some direction whether or not this is a good approach, and even give me a better way to do it if one exists? Thanks! Joel

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• populate CoreData data model from JSON files prior to app start

  - by johannes_d

  I am creating an iPad App that displays data I got from an API in JSON format. My Core Data model has several entities(Countries, Events, Talks, ...). For each entity I have one .json file that contains all instances of the entity and its attributes as well as its relationships. I would like to populate my Core Data data model with these entities before the start of the App (otherwise it takes about 15 minutes for the iPad to create all the instances of the entities from the several JSON files using factory methods). I am currently importing the data into CoreData like this: -(void)fetchDataIntoDocument:(UIManagedDocument *)document { dispatch_queue_t dataQ = dispatch_queue_create("Data import", NULL); dispatch_async(dataQ, ^{ //Fetching data from application bundle NSURL *tedxgroupsurl = [[NSBundle mainBundle] URLForResource:@"contries" withExtension:@"json"]; NSURL *tedxeventsurl = [[NSBundle mainBundle] URLForResource:@"events" withExtension:@"json"]; //converting the JSON files to NSDictionaries NSError *error = nil; NSDictionary *countries = [NSJSONSerialization JSONObjectWithData:[NSData dataWithContentsOfURL:countriesurl] options:kNilOptions error:&error]; countries = [countries objectForKey:@"countries"]; NSDictionary *events = [NSJSONSerialization JSONObjectWithData:[NSData dataWithContentsOfURL:eventsurl] options:kNilOptions error:&error]; events = [events objectForKey:@"events"]; //creating entities using factory methods in NSManagedObject Subclasses (Country / Event) [document.managedObjectContext performBlock:^{ NSLog(@"creating countries"); for (NSDictionary *country in countries) { [Country countryWithCountryInfo:country inManagedObjectContext:document.managedObjectContext]; //creating Country entities } NSLog(@"creating events"); for (NSDictionary *event in events) { [Event eventWithEventInfo:event inManagedObjectContext:document.managedObjectContext]; // creating Event entities } NSLog(@"done creating, saving document"); [document saveToURL:document.fileURL forSaveOperation:UIDocumentSaveForOverwriting completionHandler:NULL]; }]; }); dispatch_release(dataQ); } This combines the different JSON files into one UIManagedDocument which i can then perform fetchRequests on to populate tableViews, mapView, etc. I'm looking for a way to create this document outside my application & add it to the mainBundle. Then I could copy it once to the apps DocumentsDirectory and be able I use it (instead of creating the Document within the app from the original JSON files). Any help is appreciated!

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• grails question (sample 1 of Grails To Action book) problem with Controller and Service

  - by fegloff

  Hi, I'm doing Grails To Action sample for chapter one. Every was just fine until I started to work with Services. When I run the app I have the following error: groovy.lang.MissingPropertyException: No such property: quoteService for class: qotd.QuoteController at qotd.QuoteController$_closure3.doCall(QuoteController.groovy:14) at qotd.QuoteController$_closure3.doCall(QuoteController.groovy) at java.lang.Thread.run(Thread.java:619) Here is my groovie QuoteService class, which has an error within the definition of GetStaticQuote (ERROR: Groovy:unable to resolve class Quote) package qotd class QuoteService { boolean transactional = false def getRandomQuote() { def allQuotes = Quote.list() def randomQuote = null if (allQuotes.size() > 0) { def randomIdx = new Random().nextInt(allQuotes.size()) randomQuote = allQuotes[randomIdx] } else { randomQuote = getStaticQuote() } return randomQuote } def getStaticQuote() { return new Quote(author: "Anonymous",content: "Real Programmers Don't eat quiche") } } Controller groovie class package qotd class QuoteController { def index = { redirect(action: random) } def home = { render "<h1>Real Programmers do not each quiche!</h1>" } def random = { def randomQuote = quoteService.getRandomQuote() [ quote : randomQuote ] } def ajaxRandom = { def randomQuote = quoteService.getRandomQuote() render "<q>${randomQuote.content}</q>" + "<p>${randomQuote.author}</p>" } } Quote Class: package qotd class Quote { String content String author Date created = new Date() static constraints = { author(blank:false) content(maxSize:1000, blank:false) } } I'm doing the samples using Eclipse with grails addin. Any advice? Regards, Francisco

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• Should Service Depend on Many Repositories, or Break Them Up?

  - by Josh Pollard

  I'm using a repository pattern for my data access. So I basically have a repository per table/class. My UI currently uses service classes to actually get things done, and these service classes wrap, and therefore depend on repositories. In many cases my services are only dependent upon one or two repositories, so things aren't too crazy. Unfortunately, one of my forms in the UI expects the user to enter data that will span five different tables. For this form I made a single service class that depends upon five repositories. Then the methods within the service for saving and loading the data call the appropriate methods on all of the corresponding repositories. As you can imagine, the save and load methods in this service are really big. Also, unit testing this service is getting really difficult because I have to setup so many fake repositories. Would it have been a better choice to break this single service apart into a few smaller services? It would put more code at the UI layer, but would make the services smaller and more testable.

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• Android - How to decide wether to run a Service in a separate Process?

  - by pableu

  I am working on an Android application that collects sensor data over the course of multiple hours. For that, we have a Service that collects the Sensor Data (e.g. Acceleration, GPS, ..), does some processing and stores them remotely on a server. Currently, this Service runs in a separate process (using android:service=":background" in the manifest). This complicates the communication between the Activities and the Service, but my predecessors created the Application this way because they thought that separating the Service from the Activities would make it more stable. I would like some more factual reasons for the effort of running a separate process. What are the advantages? Does it really run more stable? Is the Service less likely to be killed by the OS (to free up resources) if it's in a separate process? Our Application uses startForeground() and friends to minimize the chance of getting killed by the OS. The Android docs are not very specific about this, the mostly state that it depends on the Application's purpose ;-) TL;DR What are objective reasons to put a long-running Service in a separate process (in Android)?

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• VMWare server host agent service won't start

  - by Bimo Arioseno

  I'm using VMWare Server 2.0 on Windows Server 2003 R2. Sometimes after restarting the host machine, the VMWare host agent service won't start due to an error. This is the error messages from Event Viewer: [Service control manager] Timeout (30000 milliseconds) waiting for the VMware Host Agent service to connect. [Service control manager] The VMware Host Agent service failed to start due to the following error: The service did not respond to the start or control request in a timely fashion. I've set the service to automatically restart after subsequent failure using services.msc (using a 10 min. delay), but it still won't start. Only starting the service manually seems to work. Has anyone experienced this before? What workarounds or fixes are there?

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• Lost all data on Windows XP after blue screen

  - by Barb

  I got a blue screen and was trying to boot with my OS disk. Frankly, I was unsure exactly how to do this. I was trying everything and booted in partition mode. Finally, I booted with disk and ran chkdsk /r and was able to log into Windows. But, all of my files and pictures are gone. I have no backup and all I'm sick to think that I lost the last seven years of pictures of my kids. What can I do?

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• Server hang - data loss on reboot, post mortem analysis

  - by rovangju

  A development server I'm responsible for (ext3 on raid 5 w/Debian Squeeze) froze up over the weekend and I was forced to reset it, as in unresponsive from KVM/physical keyboard access, no eth devices responding, etc. Not even the backup process ran (Figures, the one time I don't check for confirmation) So after the reset, it turns out that every trace of disk IO activity that should have happened for a period of ~24H is completely gone. The log files have a big gap in the dates and times. As if the writes were never committed to disk, no processes seemed to have run. Luckily it was a weekend and nothing of value would have been lost and I don't suspect a hack. What can I do in post mortem to this event - to prevent it from ever happening again? I've seen this happen before on a completely different machine running FreeBSD. I am rounding up the disk checking tools right now - but there must be more going on! Mount options: /dev/sda1 on / type ext3 (rw,errors=remount-ro) Kernel: Linux dev 2.6.32-5-686-bigmem Disk/Inodes: 13%/3%

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• SMF restarting service whenever there's output?

  - by Phillip Oldham

  I'm trying to add a custom service to SMF's configuration, which seems successful in that the service starts and there is a log file, but therein lies the problem; the service, on start-up, prints some logging messages to the stderr. It seems that SMF is seeing those messages and, believing them to be errors, restarts the service, giving up after a number of tries and leaving the service off. What would be the best way to manage this service with SMF? The logging is needed for diagnosing problems, and would be problematic to disable. Is it possible to configure this service to only restart if the service exists?

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• tomcat start service NoClassDefFoundError?

  - by mobibob

  I am trying to redeploy my server on a new server with a different DNS and IP address. Therefore, I think my problem is in the configuration to find JAR files. Is there a way to get more detail as to which class is being requested so I can narrow down my problem. Does anyone have any suggested troubleshooting guidance for such problem? BTW - the configuration was working on the original server, and I tried to find all the locations in the files: conf/, worker.properties, server.xml, catalina.policy, web.xml. The jarkarta.log repeats the starting... error initializing ... forever. Very boring, therefore, the problem has to be fundamental. Apparently, the error message is recorded in the log across more than one line and would be this: Error occurred during initialization of VM java/lang/NoClassDefFoundError : java/lang/Object [2012-05-21 18:20:33] [info] Procrun (2.0.4.0) started [2012-05-21 18:20:33] [info] Running Service... [2012-05-21 18:20:33] [info] Starting service... [2012-05-21 18:20:33] [info] Error occurred during initialization of VM [2012-05-21 18:20:33] [info] java/lang/NoClassDefFoundError [2012-05-21 18:20:33] [info] : java/lang/Object [2012-05-21 18:21:59] [info] Procrun (2.0.4.0) started [2012-05-21 18:21:59] [info] Running Service... [2012-05-21 18:21:59] [info] Starting service... [2012-05-21 18:21:59] [info] Error occurred during initialization of VM [2012-05-21 18:21:59] [info] java/lang/NoClassDefFoundError [2012-05-21 18:21:59] [info] : java/lang/Object [2012-05-21 18:35:16] [info] Procrun (2.0.4.0) started [2012-05-21 18:35:16] [info] Running Service... [2012-05-21 18:35:16] [info] Starting service... [2012-05-21 18:35:16] [info] Error occurred during initialization of VM [2012-05-21 18:35:16] [info] java/lang/NoClassDefFoundError [2012-05-21 18:35:16] [info] : java/lang/Object [2012-05-21 18:45:25] [info] Procrun (2.0.4.0) started [2012-05-21 18:45:25] [info] Running Service... [2012-05-21 18:45:25] [info] Starting service... [2012-05-21 18:45:25] [info] Error occurred during initialization of VM [2012-05-21 18:45:25] [info] java/lang/NoClassDefFoundError [2012-05-21 18:45:25] [info] : java/lang/Object [2012-05-21 18:46:29] [info] Procrun (2.0.4.0) started [2012-05-21 18:46:29] [info] Running Service... [2012-05-21 18:46:29] [info] Starting service... [2012-05-21 18:46:29] [info] Error occurred during initialization of VM [2012-05-21 18:46:29] [info] java/lang/NoClassDefFoundError

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• How to avoid damage to ISO archives?

  - by TMRW

  So had a problem where a 16GB ISO was damaged(likely my own fault using standard windows copy dialog instead of proper copy tool like robocopy with verification turned on). It took several hours but i managed to restore the ISO(basicly i rebuilt the damaged parts and recompiled).Namely some .rar archives inside it were unreadable but the ISO itself was readable. So im wondering how can i further protect something like this from happening again?.Obviously proper copy tool but mayble something else?.Perhaps set as "read only" could help?.I generally don't move these files a lot and if i need to acces them then it's only for opening/extracting.

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• Recover data from a corrupted virtualbox vmdk file?

  - by Neth

  The power went out while I was doing a build on a VirtualBox machine, when I restarted the vmdk for the disk the vm was using was corrupted, apparently irrecoverably. I have been able to grep the 66GB vmdk file and it finds strings from the code I was working on that hadn't gotten in to subversion yet (yeah, yeah I know). But the strings are either in the shell history or what look to be strings inside object files. Any ideas for finding/recovering the source code? If it helps the vm was Linux, Fedora Core 10 on an ext3 filesystem. The host is an ubuntu 10.04_amd64 and has an ext4 filesystem.

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• Recover data from physically damaged harddrive. What are my options?

  - by Michael Kniskern

  I was trying to replace the power supply in my desktop PC and ended up physically damaging the data connection from the hard drive to the motherboard. The plastic shelf for the copper prongs on the hard drive broke into the cable. Here is a picture of my handy work: I went to Best Buy Geek Squad to discuss my options and they said that they will need to send it to the recover center it could cost anywhere between $250 to $1600 USD to recover the data out the hard drive Is this reasonable for data recovery from a physically damaged hard drive? Are there any other options I can explore? I am going to talk to the data doctors to see what my options are. Update I took the HD to Data Doctors, and they told me that the SATA connection was broken to they would need to replaced the data connector and then copy the data to a brand new hard drive. So, with the initial analysis, cost of replacement parts, and data recovery fee it came out to $865.00 USD. The technician specifically stated if this was an older hard drive that would just need to replace the data connector. But because there is specific information related to the individual hard drive in the flash ROM, they need to transfer the data to a brand new hard drive.

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• Merely chainloading an Acer Recovery Partition deleted all data

  - by WindowsEscapist

  I was starting a backup of Acer's factory restore partition located inside of an extended partition to determine whether or not it still worked. I clicked "take no action" once I saw that it had, in fact, successfully started up. However, when I rebooted, I got an "error: no such partition" and was dropped to a GRUB recovery prompt. Upon further investigation, I discovered that all partitions inside the extended partition were gone except for the recovery partition! What happened? How can I fix this? testdisk doesn't find the deleted partitions!

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• Ways to recover data from external hard drive

  - by Howard Benson

  I use an external hard disk for backup of my mac with time machine (OS 10.5.8). I have made something wrong and I have found important folders in the recycler bin. These folders come from external hd. They are backup folders (backups.backupdb) and others. I have tried to restore them draggin and dropping. Some of them came back in the external hd in a while. For the others it takes hours to "preparing to copy" and then it has said "there's no space to copy" on ext hd. It's strange. Files are now in the recycle bin (180gb), and the ext had should have lot of free space. But it isn't really so. Ext hd is not free of space even if these files are in the bin. I ask for advices. I'm not also able to use time machine now (and i have "lost" old backups) for the same reason. Ext hd says that it has not free space.. Thanks

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• Migrating Linux user data to Windows profiles automatically

  - by scott ryan

  I have what seems to be an incredibly simple problem with a very simple solution but I'm having some trouble connecting dots. I have an aging server running Ubuntu Server which hosts roaming profiles. I am switching to a Windows Server 2012 DS shortly. Users used to be named firstinitial.lastname and we are switching to firstname.lastname. I need to transfer things like favorites, documents, etc. from the roaming Linux profile to the user's local Windows profile. So, the way I think it'd work is by using a login script. I think I'd use a script to mount the Linux server's /home for each user, then do copy to various paths (documents, pictures, etc.). But, how do I automate this for each user that logs in? I'm working with a nonprofit, so doing this by hand would probably be out of their budget. I'm open to suggestions, though. What I want is basically Windows Easy Migration, but I'm fairly certain that won't work under Wine... (Kidding, I promise). Thanks!

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• Recover deleted data

  - by atapimp24

  Hi, A user deleted his documents from his laptop somehow and has no backup available. How would one go on his way to recover these deleted files. I have zero experience on this issue. Are there any open source or freeware tools that I can use to attempt a recovery of these files. Thanks

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• "service"-command and environment variables

  - by varesa

  I am trying to start a service that requires a env. variable to be set to certain path. I set this variable in "/etc/profile.d/". However when I start this service using the service command, it doesn't work. man service: service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working directory set to /. So it seems that service is removing my variables. How should I set the variables up to keep them from being removed. Or is that something i should not do. I could start the service manually using the init-scripts, or even hardcode the path into the script, but I'd like to know how to use it with the service command.

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• Rescue data from damaged hard disk

  - by Lexsys

  Hello. I have a 500 GB hard drive with one NTFS-partition on it. I can mount it with Ubuntu and view the contents. But when I try to copy something, I get an I/O error. Ok, I tried to make its image with dd. I/O error as soon as it starts. I have installed ddrescue, but its manual page says not to use it with drives, failing on I/O. Can I manage to get some information from this drive and how to do this?

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• SQL SERVER – Configure Management Data Collection in Quick Steps – T-SQL Tuesday #005

  - by pinaldave

  This article was written as a response to T-SQL Tuesday #005 – Reporting. The three most important components of any computer and server are the CPU, Memory, and Hard disk specification. This post talks about  how to get more details about these three most important components using the Management Data Collection. Management Data Collection generates the reports for the three said components by default. Configuring Data Collection is a very easy task and can be done very quickly. Please note: There are many different ways to get reports generated for CPU, Memory and IO. You can use DMVs, Extended Events as well Perfmon to trace the data. Keeping the T-SQL Tuesday subject of reporting this post is created to give visual tutorial to quickly configure Data Collection and generate Reports. From Book On-Line: The data collector is a core component of the Data Collection platform for SQL Server 2008 and the tools that are provided by SQL Server. The data collector provides one central point for data collection across your database servers and applications. This collection point can obtain data from a variety of sources and is not limited to performance data, unlike SQL Trace. Let us go over the visual tutorial on how quickly Data Collection can be configured. Expand the management node under the main server node and follow the direction in the pictures. This reports can be exported to PDF as well Excel by writing clicking on reports. Now let us see more additional screenshots of the reports. The reports are very self-explanatory  but can be drilled down to get further details. Click on the image to make it larger. Well, as we can see, it is very easy to configure and utilize this tool. Do you use this tool in your organization? Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, SQL, SQL Authority, SQL Performance, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology Tagged: SQL Reporting, SQL Reports

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• Allen for Umbraco with location EXIF meta data

  - by Vizioz Limited

  The latest version of Allen for Umbraco has now hit the Apple App store, we have managed to add some nice improvements to this version that include:Storing location and direction information when photos are taken within the AppEmbedding EXIF data into the images when they are uploadBackground UploadingPull to refresh the media tree Location and DirectionBy default when the camera is used within an application the location and direction that the camera is pointing is not stored within the image meta data. We have now added full support so that this data is now added. We have added a setting which allows you to prevent this data from being uploaded to your website if you do not want the location data to be sent you can turn it off within Allen, Note: Please don't forget that location services do need to be turned on to allow the app to access the images in the phone's asset library.We have had quite a few ideas from users already for using this location data, including logging free parking in Denmark to geo-tagging holiday photos and linking the photos to Google street view. Embedding EXIF dataWe now embed all the meta data available on the iPhone into the image when it is uploaded to your server, this allows you to pull the data out and use it within your site. Have a look at Cultiv's Photo Meta Data package for great example code that allows you to automatically pull this data out and populate properties on your Umbraco media item.We slightly modified the source code of this package to allow the package to always extract the image data, as the default package requires a property to allow the data to be extracted, it's an easy change, if you get stuck add a comment to this post. Background UploadingIf you try to upload multiple images and need to start doing something else on your phone, you can now click the home button and the application will continue to upload your images in the background. As soon as it has finished you will receive a standard Apple notification. Pull to RefreshOur final enhancement has been to add "Pull to refresh" to the media trees, just pull the tree downwards with your finger and it will refresh, this is useful if you are adding items to your media tree while testing your site with Allen for Umbraco. Future enhancements.. your ideas?If you have any ideas for future enhancement feel free to add a comment below!

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• Book Review: Programming Windows Identity Foundation

  - by DigiMortal

  Programming Windows Identity Foundation by Vittorio Bertocci is right now the only serious book about Windows Identity Foundation available. I started using Windows Identity Foundation when I made my first experiments on Windows Azure AppFabric Access Control Service. I wanted to generalize the way how people authenticate theirselves to my systems and AppFabric ACS seemed to me like good point where to start. My first steps trying to get things work opened the door to whole new authentication world for me. As I went through different blog postings and articles to get more information I discovered that the thing I am trying to use is the one I am looking for. As best security API for .NET was found I wanted to know more about it and this is how I found Programming Windows Identity Foundation. What’s inside? Programming WIF focuses on architecture, design and implementation of WIF. I think Vittorio is very good at teaching people because you find no too complex topics from the book. You learn more and more as you read and as a good thing you will find that you can also try out your new knowledge on WIF immediately. After giving good overview about WIF author moves on and introduces how to use WIF in ASP.NET applications. You will get complete picture how WIF integrates to ASP.NET request processing pipeline and how you can control the process by yourself. There are two chapters about ASP.NET. First one is more like introduction and the second one goes deeper and deeper until you have very good idea about how to use ASP.NET and WIF together, what issues you may face and how you can configure and extend WIF. Other two chapters cover using WIF with Windows Communication Foundation (WCF) band   Windows Azure. WCF chapter expects that you know WCF very well. This is not introductory chapter for beginners, this is heavy reading if you are not familiar with WCF. The chapter about Windows Azure describes how to use WIF in cloud applications. Last chapter talks about some future developments of WIF and describer some problems and their solutions. Most interesting part of this chapter is section about Silverlight. Who should read this book? Programming WIF is targeted to developers. It does not matter if you are beginner or old bullet-proof professional – every developer should be able to be read this book with no difficulties. I don’t recommend this book to administrators and project managers because they find almost nothing that is related to their work. I strongly recommend this book to all developers who are interested in modern authentication methods on Microsoft platform. The book is written so well that I almost forgot all things around me when I was reading the book. All additional tools you need are free. There is also Azure AppFabric ACS test version available and you can try it out for free. Table of contents Foreword Acknowledgments Introduction Part I Windows Identity Foundation for Everybody 1 Claims-Based Identity 2 Core ASP.NET Programming Part II Windows Identity Foundation for Identity Developers 3 WIF Processing Pipeline in ASP.NET 4 Advanced ASP.NET Programming 5 WIF and WCF 6 WIF and Windows Azure 7 The Road Ahead Index

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• Which data structure should I use for dynamically generated platforms?

  - by Joey Green

  I'm creating a platform type of game with various types of platforms. Platforms that move, shake, rotate, etc. Multiple types and multiple of each type can be on the screen at once. The platforms will be procedural generated. I'm trying to figure out which of the following would be a better platform system: Pre-allocate all platforms when the scene loads, storing each platform type into different platform type arrays( i.e. regPlatformArray ), and just getting one when I need one. The other option is to allocate and load what I need when my code needs it. The problem with 1 is keeping up with the indices that are in use on screen and which aren't. The problem with 2 is I'm having a hard time wrapping my head around how I would store these platforms so that I can call the update/draw methods on them and managing that data structure that holds them. The data structure would constantly be growing and shrinking. It seems there could be too much complexity. I'm using the cocos2d iPhone game engine. Anyways, which option would be best or is there a better option?

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