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  • How do I keep a datastructure in sync across several servers in Java?

    - by sanity
    Have a Map which contains objects that I want to keep in sync across multiple servers, such that if objects in the map are created, deleted, or modified - this is reflected immediately (ie. within a second or two) across all servers, in a way that can potentially scale up to tens of servers. Is there a lightweight open source Java tool that can do something like this? I'm aware of Terracotta but it is rather heavy weight for what I need.

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  • iPhone 3G refuses to transfer purchased apps to iTunes

    - by andynormancx
    My iPhone 3G refuses to transfer purchased apps to iTunes. This is causing me major problems with syncing. Whenever I attempt to transfer apps from the iPhone to iTunes it goes through the motions, but never actually transfers anything. It displays the various apps in the info area at the top of the screen, but the progress bar never advances. In comparison when I sync other iPhones, using the same install of iTunes, the progress bar advances and apps are transferred. The same also happens on clean installs of iTunes on other computers, it seems to be my iPhone that is the common factor. I have tried restoring the phone from a backup, which makes no difference. This started happening months ago and the phone has since been upgraded to 3.0 and 3.1, but the problem still persists. Originally it was just a minor irritation, but I made and attempt to fix it which has made things worse. I deleted all the apps from with iTunes and then did "Transfer purchases" in the hope that it might fix something. It didn't fix anything. Also, I cannot now sync at all. If I do sync iTunes now does "transferring purchases", fails to transfer and then deletes all the apps (and data) from my iPhone. It also means I can't sync music, podcasts or anything else. I can't sync anything else, because I can't temporarily turn off app syncing because then iTunes warns that the apps on the iPhone will be deleted. I also tried de-authorising and re-authorising. What can I do to get app syncing working again ? P.S. I have considered deleting all the apps and reinstalling them one by one, in the hope that it will fix the problem. However I don't really want to embark on doing that for 55+ apps and re-entering login details etc for the apps that need them, especially as I might then find out it didn't solve the problem. Update: The latest update to iTunes 9 has improved things in one key aspect. If I let a sync run to completion iTunes no longer deletes all the apps from my phone. So I can now sync all my other data, even if I still can't sync my apps. Resolved: See my answer to the question for how I finally resolved the problem.

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  • Sync Framework - In order to evaluate an indexed property, the property must be qualified and the ar

    - by Khor
    I trying to do a snapshot between SQLCE 3.5 SP1 and SQL Server 2008 by using the sync framework. I received a inner exception stated that "{"Unable to enumerate changes at the DbServerSyncProvider for table 'ArInvoice' in synchronization group 'ArInvoiceSyncTableSyncGroup'."}". The inner text for the inner exception stated that "Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.". And the item for the inner exception indicated that "In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user.". What is going wrong? Any setting i miss out?

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  • How do you handle the deletion of your model working with ViewModels and keeping them in sync ?

    - by Lisa
    Hello, these could be my entity relations: 1 Pupil has 1 Chair 1 Pupil has N Documents 1 Pupil has N Marks 1 Pupil has N IncidentReports etc... So with that sample I get 4 IEnumerable from my database put each into an ObservableCollection. Now I have 4 different Views each bound to one of those 4 collections. Lets assume I delete a single PupilViewModel in the AdministrationController which is the only View where I can delete a PupilViewModel. Now I have to inform 3 other Controller and their ObservableCollections about the one deleted PupilViewModel to keep the whole application synchronized... thats stupid somehow. Do you have any good advice on that scenario? AND it gets even worse. If I delete a schoolclass I have to sync the pupils everywhere AND the documents or incidentreports or marks... gush... o_O

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  • Microsoft Sync Framework - Local DB and Remote DB have to have the same schema?

    - by Josh
    When using MSF, is it implied in the technology that the sync tables are supposed to be 1-1? The reason I'm wondering is that if I'm synching from a SQL2005 database to a SQLCE, I might want the CE one to be a little more flattened out so I can get data out with a simpler SELECT statement (as CE does not support sprocs). For example, I might have a tblCustomer, tblOrder, and tblCustomerOrder in the central database, but in the local databases one table with all the data might be preferred. Of course I'd still want the updates to reflect back and forth between the two databases. Does MSF make this possible, or does the local DB have to have the same tables as the central?

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  • iphone poll application to sync with myspace or facebook poll.

    - by Zach
    Hi, We are developing an iphone application, which requires us to add polling(survey) functionality in the app. We also have same poll in either MySpace or Facebook. We have to sync the polling data to our iphone application. How can we achieve this? We have found some third party polling service provider like Zoomerang, Poll Daddy polls, etc., but they don't have supporting API for iphone application or at least one we are not aware of. If anyone can shed light on this on how to proceed with this, it will be really very helpful. Thanks in advance. Zach.

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  • How do i keep my DB and lucene in sync?

    - by acidzombie24
    So i can have a transaction in sql. But i am sure its not a good idea to wait in the middle of a transaction for lucene to finish also i am unsure if lucene is permanently saved in the DB until i do something there. Whats the best way to keep my DB and lucene in sync? I am thinking of adding a lucene_queue in my sql db and everytime i make a change i add it into the queue (removing older queue if any) and delete it once it is done. Is this the best way? Also i am unsure how to make lucene permanently keep the changes i made and how frequent i can/should do it.

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  • How to keep statefull web clients in sync, when multiple clients are looking at the same data?

    - by Hilbrand
    In a RIA web client, created with GWT, the state is maintained in the web client, while the server is (almost) stateless (this is the preferred technique to keep the site scalable). However, if multiple users looking at the same data in their browser and one user changes something, which is send to the server and stored in the database, the other users still have the old data in their browser state. For example a tree is shown and one of the users adds/removes an item from the tree. Since there can be a lot of state in the client, what is the best technique to keep the state in the clients in sync? Are there any java frameworks that take care of this?

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  • Silverlight Cream for November 26, 2011 -- #1175

    - by Dave Campbell
    In this Issue: Michael Washington, Manas Patnaik, Jeff Blankenburg, Doug Mair, Jon Galloway, Richard Bartholomew, Peter Bromberg, Joel Reyes, Zeben Chen, Navneet Gupta, and Cathy Sullivan. Above the Fold: Silverlight: "Using ASP.NET PageMethods With Silverlight" Peter Bromberg WP7: "Leveraging Background Services and Agents in Windows Phone 7 (Mango)" Jon Galloway Metro/WinRT/Windows8: "Debugging Contracts using Windows Simulator" Cathy Sullivan LightSwitch: "LightSwitch: It Is About The Money (It Is Always About The Money)" Michael Washington Shoutouts: Michael Palermo's latest Desert Mountain Developers is up Michael Washington's latest Visual Studio #LightSwitch Daily is up From SilverlightCream.com:LightSwitch: It Is About The Money (It Is Always About The Money)Michael Washington has a very nice post up about LightSwitch apps in general and his opinion about the future use... based on what he and I have been up to, I tend to agree on all counts!Accessing Controls from DataGrid ColumnHeader – SilverlightManas Patnaik's latest post is about using the VisualTreeHelper class to iterate through the visual tree to find the controls you need ... including sample code31 Days of Mango | Day #18: Using Sample DataJeff Blankenburg's Day 18 in his 31-Day Mango quest is on Sample Data using Expression Blend, and he begins with great links to his other Blend posts followed by a nice sample data tutorial and source31 Days of Mango | Day #19: Tilt EffectsDoug Mair returns to the reigns of Jeff's 31-Days series with number 19 which is all about Tilt Effects ... as seen in the Phone application when you select a user... Doug shows how to add this effect to your appLeveraging Background Services and Agents in Windows Phone 7 (Mango)Jon Galloway has a WP7 post up discussing Background Services and how they all fit together... he's got a great diagram of that as an overview then really nice discussion of each followed up by his slides from DevConnections, and codeNetflix on Windows 8This one isn't C#/XAML, but Richard Bartholomew has a Netflix on Windows 8 app running that bears noticeUsing ASP.NET PageMethods With SilverlightPeter Bromberg has a post up demonstrating calling PageMethods from a Silverlight app using the ScriptManager controlAWESOME Windows Phone Power ToolJoel Reyes announced the release of a full-featured tool for side-loading apps to your WP7 device... available at codeplexMicrosoft Windows Simulator Rotation and Resolution EmulationZeben Chen discusses the Windows 8 Simulator a bit deeper with this code-laden post showing how to look at roation and orientation-aware apps and resolution.First look at Windows SimulatorNavneet Gupta has a great into post to using the simulator in VS2011 for Windows 8 apps. Four things you really need this for: Touch Emulation, Rotation, Different target resolutions, and ContractsDebugging Contracts using Windows SimulatorCathy Sullivan shows how to debug W8 Contracts in VS2011... why you ask? because when you hit one in the debugger, the target app disappears.. but enter the simulator... check it outStay in the 'Light!Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCreamJoin me @ SilverlightCream | Phoenix Silverlight User GroupTechnorati Tags:Silverlight    Silverlight 3    Silverlight 4    Windows PhoneMIX10

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  • Silverlight Cream for November 22, 2011 -- #1172

    - by Dave Campbell
    In this Issue: XAMLGeek, WindowsPhoneGeek, Nigel Sampson, Jesse Liberty, Sumit Dutta(-2-), Dave Bost, Jared Bienz, Joost van Schaik, and Michael Crump. Above the Fold: Silverlight: "10 Laps around Silverlight 5 (Part 7 of 10)" Michael Crump WP7: "Using MVVMLight, ItemsControl, Blend and behaviors to make a ‘heads up compass’" Joost van Schaik Metro/WinRT/W8: "“Badevand” for Windows 8" XAMLGeek Shoutouts: Michael Palermo's latest Desert Mountain Developers is up Michael Washington's latest Visual Studio #LightSwitch Daily is up From SilverlightCream.com:“Badevand” for Windows 8XAMLGeek posted a Metro app that shows water and air temperature and rain level for 5 beaches in Copenhagen, Denmark... no source, but good to see people posting appsGetting Started with Windows Phone RemindersWindowsPhoneGeek digs into Reminders in this WP7.1 post... the code you need, description, and a project to downloadHelp my app has been revoked!Nigel Sampson had a surprise when his latest app was revoked on his device, and then another... read what the solution wasA Dozen Windows Phone Videos… And CountingJesse Liberty posted his 12th WP7.1 video on Channel 9 - all about Reminders in MangoPart 23 - Windows Phone 7 - Detect Operator and Network InformationSumit Dutta has 2 more parts to his WP7 quest up... this part 23 is about getting mobile operator information and hot to get network capabilities using Microsoft.Phone.Net.DeviceNetworkInformationPart 24 - Windows Phone 7 - Microphone RepeaterIn part 24, Sumit Dutta uses the Microsoft.Xna.Framework Microphone class to record and play back voice.31 Days of Mango | Day #13: Marketplace Test KitDave Bost is at the helm of Jeff Blankenburg's Day 13 in his 31 day quest, discussing the Marketplace Test Kit and showing how to use it to determine if your app is ready for certification31 Days of Mango | Day #12; Beta DistributionJeff Blankenburg's Day 12 is written by guest author Jared Bienz, and shows how to submit an application for Beta testingUsing MVVMLight, ItemsControl, Blend and behaviors to make a ‘heads up compass’Joost van Schaik has a tutorial up showing how to make a WP7 Compass app using MVVMLight, Expression Blend, and then shows his thoughts on using the ItemsControl and Behaviors... code, descriptions and a project to download.... and I think I got your name right for the first time, Joost :)10 Laps around Silverlight 5 (Part 7 of 10)Michael Crump put out part 7 of his Silverlight 5 series at SilverlightShow... this is actually part 2 of OS Integration with Silverlight covering, among other things, 64-bit browser support and Power AwarenessStay in the 'Light!Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCreamJoin me @ SilverlightCream | Phoenix Silverlight User GroupTechnorati Tags:Silverlight    Silverlight 3    Silverlight 4    Windows PhoneMIX10

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  • How to implement a SIMPLE "You typed ACB, did you mean ABC?"

    - by marcgg
    I know this is not a straight up question, so if you need me to provide more information about the scope of it, let me know. There are a bunch of questions that address almost the same issue (they are linked here), but never the exact same one with the same kind of scope and objective - at least as far as I know. Context: I have a MP3 file with ID3 tags for artist name and song title. I have two tables Artists and Songs The ID3 tags might be slightly off (e.g. Mikaell Jacksonne) I'm using ASP.NET + C# and a MSSQL database I need to synchronize the MP3s with the database. Meaning: The user launches a script The script browses through all the MP3s The script says "Is 'Mikaell Jacksonne' 'Michael Jackson' YES/NO" The user pick and we start over Examples of what the system could find: In the database... SONGS = {"This is a great song title", "This is a song title"} ARTISTS = {"Michael Jackson"} Outputs... "This is a grt song title" did you mean "This is a great song title" ? "This is song title" did you mean "This is a song title" ? "This si a song title" did you mean "This is a song title" ? "This si song a title" did you mean "This is a song title" ? "Jackson, Michael" did you mean "Michael Jackson" ? "JacksonMichael" did you mean "Michael Jackson" ? "Michael Jacksno" did you mean "Michael Jackson" ? etc. I read some documentation from this /how-do-you-implement-a-did-you-mean and this is not exactly what I need since I don't want to check an entire dictionary. I also can't really use a web service since it's depending a lot on what I already have in my database. If possible I'd also like to avoid dealing with distances and other complicated things. I could use the google api (or something similar) to do this, meaning that the script will try spell checking and test it with the database, but I feel there could be a better solution since my database might end up being really specific with weird songs and artists, making spell checking useless. I could also try something like what has been explained on this post, using Soundex for c#. Using a regular spell checker won't work because I won't be using words but names and 'titles'. So my question is: is there a relatively simple way of doing this, and if so, what is it? Any kind of help would be appreciated. Thanks!

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  • Why is my WPF splash screen progress bar out of sync with the execution of the startup steps?

    - by denny_ch
    Hello, I've implemented a simple WPF splash screen window which informs the user about the progress of the application startup. The startup steps are defined this way: var bootSequence = new[] { new {Do = (Action) InitLogging, Message = "Init logging..."}, new {Do = (Action) InitNHibernate, Message = "Init NHibernate..."}, new {Do = (Action) SetupUnityContainer, Message = "Init Unity..."}, new {Do = (Action) UserLogOn, Message = "Logon..."}, new {Do = (Action) PrefetchData, Message = "Caching..."}, }; InitLogging etc. are methods defined elsewhere, which performs some time consuming tasks. The boot sequence gets executed this way: foreach (var step in bootSequence) { _status.Update(step.Message); step.Do(); } _status denotes an instance of my XAML splash screen window containing a progress bar and a label for status information. Its Update() method is defined as follows: public void Update(string status) { int value = ++_updateSteps; Update(status, value); } private void Update(string status, int value) { var dispatcherOperation = Dispatcher.BeginInvoke( DispatcherPriority.Background, (ThreadStart) delegate { lblStatus.Content = status; progressBar.Value = value; }); dispatcherOperation.Wait(); } In the main this works, the steps get executed and the splash screen shows the progress. But I observed that the splash screen for some reasons doesn't update its content for all steps. This is the reason I called the Dispatcher async and wait for its completion. But even this didn't help. Has anyone else experienced this or some similar behaviour and has some advice how to keep the splash screen's update in sync with the execution of the boot sequence steps? I know that the users will unlikely notice this behaviour, since the splash screen is doing something and the application starts after booting is completed. But myself isn't sleeping well, because I don't know why it is not working as expected... Thx for your help, Denny

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  • How do I get my ActivityUnitTestCases to sync with the MessageQueue thread and call my Handler?

    - by Ricardo Gladwell
    I'm writing unit tests for a ListActivity in Android that uses a handler to update a ListAdapter. While my activity works in the Android emulator, running the same code in a unit test doesn't update my adapter: calls to sendEmptyMessage do not call handleMessage in my activity's Handler. How do I get my ActivityUnitTestCase to sync with the MessageQueue thread and call my Handler? The code for the Activity is somewhat like this: public class SampleActivity extends ListActivity implements SampleListener { List samples = new ArrayList(); public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.sample_list); listView.setEmptyView(findViewById(R.id.empty)); } private final Handler handler = new Handler() { @Override public void handleMessage(Message msg) { // unit test never reaches here sharesAdapter = new SampleAdapter(SampleActivity.this, samples); setListAdapter(sharesAdapter); } }; public void handleSampleUpdate(SampleEvent event) { samples.add(event.getSample()); handler.sendEmptyMessage(0); } } The code for my unit test is somewhat like this: public class SampleActivityTest extends ActivityUnitTestCase<SampleActivity> { public SampleActivityTest() { super(SampleActivity.class); } @MediumTest public void test() throws Exception { final SampleActivity activity = startActivity(new Intent(Intent.ACTION_MAIN), null, null); final ListView listView = (ListView) activity.findViewById(android.R.id.list); activity.handleSampleUpdate(new SampleEvent(this)); // unit test assert fails on this line: assertTrue(listView.getCount() == 1); } }

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  • Flash video plays well, but time and time-remaining are out of sync.

    - by sparkyfied
    Hey guys, Could be a known issue, an issue with my code or an oversight on my part. I have created a video player in flash. I have got it playing progressive and streaming over rtmp/rtmpt so that is all fine. My only issue is that when the video's are playing, the time-codes for time played and time remaining are not synced. So, if my video is 20 secs long and 5 have been played, time played will be 5secs, time remaining will be 16secs until it updates about half a second later. So even though they are both being set with the same line of code, there are not changing at the same time. The time played changes, then a split second later the time remaining changes. Anyone got any idea what this could be. Maybe a miscalculation on my part. Maybe I need to round up or down the remaining time. How can I sync the two times. I understand this is probably an tough question to answer, I have done my best to explain it. Thanks in advance.

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  • Windows 7 - SyncToy alternative - Sync folder with Network drive...

    - by alex
    I have a Windows 7 laptop, which i want to back up to a network folder. There is a drive (partition) on my laptop machine that i want to backup to a network drive- if i delete a file in the folder on my laptop, it should also be deleted from the backup... I used to use syncToy, however i understand this does not work correctly with windows 7 - at least not with a large number of files. Are there any alternatives?

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  • Outlook and IMAP - Outlook doesn't allow the Drafts and Trash folders to sync with the respective IMAP folders

    - by Matt
    I'm using Outlook 2007 and Outlook 2010 against an IMAP server (the problem exists across many, like Gmail, you name it). Outlook lets you set your Outlook "Sent" folder to map to the IMAP server's Sent folder (the other choice is to map your Outlook Sent to your Personal Folders Sent) - this is good. When you send a message from Outlook and then look in the sent folder of the IMAP server (e.g. from a different client or from a browser), the messages are there. This is the behavior I want. Outlook does NOT support the same behavior for Drafts and Trash. In both cases, items deleted (or Drafts saved) in Outlook go in to Outlook's local folders and do NOT show on the IMAP server's Trash or Drafts folders. Same problem in reverse. Thunderbird on the other hand does support the proper mapping of Drafts, Sent and Trash. I expected this to be IMAP-specific but it appears to be client specific. What does Outlook implement it this way and is there a workaround?

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  • please explain my fio results - is O_SYNC|O_DIRECT misbehaving on linux?

    - by Zoltan
    I'm going mad over figuring out what the problem could be with one of our storage boxes. With a simple fio script I'm testing random writes using bs=1M and direct=1. The SSD is a Samsung 840pro attached to an LSI HBA (3Gbit/s ports). This is the result I'm getting under FreeBSD 9.1: WRITE: io=13169MB, aggrb=224743KB/s, minb=224743KB/s, maxb=224743KB/s, mint=60002msec, maxt=60002msec This is regardless of sync being set to 0 or 1. On linux, this is the result with sync=0: WRITE: io=14828MB, aggrb=253060KB/s, minb=253060KB/s, maxb=253060KB/s, mint=60001msec, maxt=60001msec and with sync=1: WRITE: io=6360.0MB, aggrb=108542KB/s, minb=108542KB/s, maxb=108542KB/s, mint=60001msec, maxt=60001msec My understanding is that since I'm operating on the raw block device, O_SYNC should not make any difference - there's no filesystem, any barrier, anything between the writes and the drive itself. Especially with O_DIRECT|O_SYNC set. Any ideas? For reference, here's the fio script I'm testing with: [global] bs=1M ioengine=sync iodepth=4 size=16g direct=1 runtime=60 filename=/dev/sdh sync=1 [rand-write] rw=randwrite stonewall

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  • Explaining the difference between OData & RDF by way of analogy

    - by jamiet
    A couple of months back I wrote a blog post entitled Microsoft, OData and RDF where I gave a high level view of the OData protocol and how it compares to RDF. I talked about linked data, triples and such like which may have been somewhat useful however jargon-heavy. Earlier today Dr Michael Hausenblas (blog | twitter) offered an analogy which I think is probably more useful and with Michael's permission I'm re-posting it here:Imagine a Web (a Web of Documents, if you wish), which is not based on HTML and hyperlinks, but on MS Word documents. The documents are all available on the Internet, so you can download them and consume the content. But after you’re done with a certain document that talks about a book, how do you learn more about it? For example, reviews about the book or where you can purchase it? Maybe the original document mentions that there is some more related information on another server. So you’d need to go there and look for the related bit of information yourself. You see? That’s what the Web is great at – you just click on a hyperlink and it takes you to the document (or section) you’re interested in. All the legwork is taken care of for you through HTML, URIs and HTTP.Hm, right, but how is this related to OData? Well, OData feels a bit like the above mentioned scenario, just concerning data. Of course you – well actually rather a software program I guess – can consume it (a single source), but that’s it.from Oh – it is data on the Web by Michael Hausenblas I believe that OData has loads of use cases but its important to understand its limitations as well and I think Michael has done a good job of explaining those limitations.@Jamiet   Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • How do you get SharePoint back in sync when you change a user's sAMAccountName?

    - by Kirk Liemohn
    I have observed on SharePoint 2010 that if you change the sAMAccountName of a user after the user has logged into a SharePoint site collection, the tp_Login field in the UserInfo table does not get updated. It still has the old user Id. While the user can log into SharePoint under the new account, these new logins do not update the table. I have code that looks at the SPUser.LoginName and this value appears to be the tp_Login field value which is now old. The fact that this value is old causes my code to fail. I suspect this behavior is identical in SharePoint 2007. Is there any way to force SharePoint to recognize the new sAMAccountName? I suspect that profile synchronization might help, but I would like for my solution to work with WSS 3.0 and SharePoint 2010 Foundation. I considered manually updating the database table, but I would like to stick with supported approaches.

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  • Need data on disk drive management by OS: getting base I/O unit size, "sync" option, Direct Memory A

    - by Richard T
    Hello All, I want to ensure I have done all I can to configure a system's disks for serious database use. The three areas I know of (any others?) to be concerned about are: I/O size: the database engine and disk's native size should either match, or the database's native I/O size should be a multiple of the disk's native I/O size. Disks that are capable of Direct Memory Access (eg. IDE) should be configured for it. When a disk says it has written data persistently, it must be so! No keeping it in cache and lying about it. I have been looking for information on how to ensure these are so for CENTOS and Ubuntu, but can't seem to find anything at all! I want to be able to check these things and change them if needed. Any and all input appreciated.

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  • Game works on netbeans but not outside netbeans in jar file?

    - by Michael Haywood
    I am creating a basic game of 'Pong'. I have finished the game apart from a few glitches I need to remove. The game runs perfectly in netbeans but if I create a jar file errors come up causing it to not work. I am quite new to java but I believe it is something to do with my code looking for the images but the images have not been loaded up yet. Here is the error. How can I get this to work outside of netbeans in a jar file? C:\Users\michael>java -jar "C:\Users\michael\Documents\NetBeansProjects\Pong\dis t\Pong.jar" Exception in thread "main" java.lang.NullPointerException at javax.swing.ImageIcon.<init>(Unknown Source) at pong.BallMainMenu.<init>(BallMainMenu.java:19) at pong.Board.gameInit(Board.java:93) at pong.Board.addNotify(Board.java:86) at java.awt.Container.addNotify(Unknown Source) at javax.swing.JComponent.addNotify(Unknown Source) at java.awt.Container.addNotify(Unknown Source) at javax.swing.JComponent.addNotify(Unknown Source) at java.awt.Container.addNotify(Unknown Source) at javax.swing.JComponent.addNotify(Unknown Source) at javax.swing.JRootPane.addNotify(Unknown Source) at java.awt.Container.addNotify(Unknown Source) at java.awt.Window.addNotify(Unknown Source) at java.awt.Frame.addNotify(Unknown Source) at java.awt.Window.show(Unknown Source) at java.awt.Component.show(Unknown Source) at java.awt.Component.setVisible(Unknown Source) at java.awt.Window.setVisible(Unknown Source) at pong.Pong.<init>(Pong.java:16) at pong.Pong.main(Pong.java:23)

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  • BizTalk: History of one project architecture

    - by Leonid Ganeline
    "In the beginning God made heaven and earth. Then he started to integrate." At the very start was the requirement: integrate two working systems. Small digging up: It was one system. It was good but IT guys want to change it to the new one, much better, chipper, more flexible, and more progressive in technologies, more suitable for the future, for the faster world and hungry competitors. One thing. One small, little thing. We cannot turn off the old system (call it A, because it was the first), turn on the new one (call it B, because it is second but not the last one). The A has a hundreds users all across a country, they must study B. A still has a lot nice custom features, home-made features that cannot disappear. These features have to be moved to the B and it is a long process, months and months of redevelopment. So, the decision was simple. Let’s move not jump, let’s both systems working side-by-side several months. In this time we could teach the users and move all custom A’s special functionality to B. That automatically means both systems should work side-by-side all these months and use the same data. Data in A and B must be in sync. That’s how the integration projects get birth. Moreover, the specific of the user tasks requires the both systems must be in sync in real-time. Nightly synchronization is not working, absolutely.   First draft The first draft seems simple. Both systems keep data in SQL databases. When data changes, the Create, Update, Delete operations performed on the data, and the sync process could be started. The obvious decision is to use triggers on tables. When we are talking about data, we are talking about several entities. For example, Orders and Items [in Orders]. We decided to use the BizTalk Server to synchronize systems. Why it was chosen is another story. Second draft   Let’s take an example how it works in more details. 1.       User creates a new entity in the A system. This fires an insert trigger on the entity table. Trigger has to pass the message “Entity created”. This message includes all attributes of the new entity, but I focused on the Id of this entity in the A system. Notation for this message is id.A. System A sends id.A to the BizTalk Server. 2.       BizTalk transforms id.A to the format of the system B. This is easiest part and I will not focus on this kind of transformations in the following text. The message on the picture is still id.A but it is in slightly different format, that’s why it is changing in color. BizTalk sends id.A to the system B. 3.       The system B creates the entity on its side. But it uses different id-s for entities, these id-s are id.B. System B saves id.A+id.B. System B sends the message id.A+id.B back to the BizTalk. 4.       BizTalk sends the message id.A+id.B to the system A. 5.       System A saves id.A+id.B. Why both id-s should be saved on both systems? It was one of the next requirements. Users of both systems have to know the systems are in sync or not in sync. Users working with the entity on the system A can see the id.B and use it to switch to the system B and work there with the copy of the same entity. The decision was to store the pairs of entity id-s on both sides. If there is only one id, the entities are not in sync yet (for the Create operation). Third draft Next problem was the reliability of the synchronization. The synchronizing process can be interrupted on each step, when message goes through the wires. It can be communication problem, timeout, temporary shutdown one of the systems, the second system cannot be synchronized by some internal reason. There were several potential problems that prevented from enclosing the whole synchronization process in one transaction. Decision was to restart the whole sync process if it was not finished (in case of the error). For this purpose was created an additional service. Let’s call it the Resync service. We still keep the id pairs in both systems, but only for the fast access not for the synchronization process. For the synchronizing these id-s now are kept in one main place, in the Resync service database. The Resync service keeps record as: ·       Id.A ·       Id.B ·       Entity.Type ·       Operation (Create, Update, Delete) ·       IsSyncStarted (true/false) ·       IsSyncFinished (true/false0 The example now looks like: 1.       System A creates id.A. id.A is saved on the A. Id.A is sent to the BizTalk. 2.       BizTalk sends id.A to the Resync and to the B. id.A is saved on the Resync. 3.       System B creates id.B. id.A+id.B are saved on the B. id.A+id.B are sent to the BizTalk. 4.       BizTalk sends id.A+id.B to the Resync and to the A. id.A+id.B are saved on the Resync. 5.       id.A+id.B are saved on the B. Resync changes the IsSyncStarted and IsSyncFinished flags accordingly. The Resync service implements three main methods: ·       Save (id.A, Entity.Type, Operation) ·       Save (id.A, id.B, Entity.Type, Operation) ·       Resync () Two Save() are used to save id-s to the service storage. See in the above example, in 2 and 4 steps. What about the Resync()? It is the method that finishes the interrupted synchronization processes. If Save() is started by the trigger event, the Resync() is working as an independent process. It periodically scans the Resync storage to find out “unfinished” records. Then it restarts the synchronization processes. It tries to synchronize them several times then gives up.     One more thing, both systems A and B must tolerate duplicates of one synchronizing process. Say on the step 3 the system B was not able to send id.A+id.B back. The Resync service must restart the synchronization process that will send the id.A to B second time. In this case system B must just send back again also created id.A+id.B pair without errors. That means “tolerate duplicates”. Fourth draft Next draft was created only because of the aesthetics. As it always happens, aesthetics gave significant performance gain to the whole system. First was the stupid question. Why do we need this additional service with special database? Can we just master the BizTalk to do something like this Resync() does? So the Resync orchestration is doing the same thing as the Resync service. It is started by the Id.A and finished by the id.A+id.B message. The first works as a Start message, the second works as a Finish message.     Here is a diagram the whole process without errors. It is pretty straightforward. The Resync orchestration is waiting for the Finish message specific period of time then resubmits the Id.A message. It resubmits the Id.A message specific number of times then gives up and gets suspended. It can be resubmitted then it starts the whole process again: waiting [, resubmitting [, get suspended]], finishing. Tuning up The Resync orchestration resubmits the id.A message with special “Resubmitted” flag. The subscription filter on the Resync orchestration includes predicate as (Resubmit_Flag != “Resubmitted”). That means only the first Sync orchestration starts the Resync orchestration. Other Sync orchestration instantiated by the resubmitting can finish this Resync orchestration but cannot start another instance of the Resync   Here is a diagram where system B was inaccessible for some period of time. The Resync orchestration resubmitted the id.A two times. Then system B got the response the id.A+id.B and this finished the Resync service execution. What is interesting about this, there were submitted several identical id.A messages and only one id.A+id.B message. Because of this, the system B and the Resync must tolerate the duplicate messages. We also told about this requirement for the system B. Now the same requirement is for the Resunc. Let’s assume the system B was very slow in the first response and the Resync service had time to resubmit two id.A messages. System B responded not, as it was in previous case, with one id.A+id.B but with two id.A+id.B messages. First of them finished the Resync execution for the id.A. What about the second id.A+id.B? Where it goes? So, we have to add one more internal requirement. The whole solution must tolerate many identical id.A+id.B messages. It is easy task with the BizTalk. I added the “SinkExtraMessages” subscriber (orchestration with one receive shape), that just get these messages and do nothing. Real design Real architecture is much more complex and interesting. In reality each system can submit several id.A almost simultaneously and completely unordered. There are not only the “Create entity” operation but the Update and Delete operations. And these operations relate each other. Say the Update operation after Delete means not the same as Update after Create. In reality there are entities related each other. Say the Order and Order Items. Change on one of it could start the series of the operations on another. Moreover, the system internals are the “black boxes” and we cannot predict the exact content and order of the operation series. It worth to say, I had to spend a time to manage the zombie message problems. The zombies are still here, but this is not a problem now. And this is another story. What is interesting in the last design? One orchestration works to help another to be more reliable. Why two orchestration design is more reliable, isn’t it something strange? The Synch orchestration takes all the message exchange between systems, here is the area where most of the errors could happen. The Resync orchestration sends and receives messages only within the BizTalk server. Is there another design? Sure. All Resync functionality could be implemented inside the Sync orchestration. Hey guys, some other ideas?

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  • Web deploy (msdeploy), syncing everything but sites and pools (but include siteDefaults)

    - by jishi
    Today I do the following to sync two webservers but skip all site configuration: msdeploy -verb:sync -source:webServer -dest:webServer,computerName=web25:8080 -skip:objectName=section,absolutePath=system.applicationHost/sites -skip:objectName=section,absolutePath=system.applicationHost/applicationPools However, this effectively also skip the siteDefaults, which I do like to sync (system.applicationHost/sites/siteDefaults) There doesn't seem to be a way to "include" a section, to override the skip directive. And there doesn't seem to be a way to sync only the siteDefaults section from applicationHost either, since source appHostConfig only seem to sync a specified site, and not siteDefaults. Maybe it is possible to "skip" using an Xpath expression or similar, to only skip the nodes, but include , but I find the documentation a bit confusing and my Xpath is rusty.

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