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  • Please suggest other ways of communicating between server & client.

    - by Geo
    I'm writing a TCP chat server ( programming language does not mather ). It's a school project for my nephew, so it won't be released, and all questions I'm asking are just for my knowledge :). . Some of the things it will support: chatting between users ( doh ), it will be multithreaded sending each other files I know I could easily get away with all the stuff above if I go with serialization, and just send objects from client to server and back. But, if I do that, it will be limited to a specific programming language ( meaning clients written in other programming languages may not be able to deserialize the objects ). What would be the way to go so that other clients written in other languages could be supported? One way to go, off the top of my head, would be to go in this direction: the server & the client communicate by sending messages & chunks ( in lieu of other names ). Here's what I mean by this: every time the client/server wants to send something ( text message or file ) it will first send a simple text message ( newline terminated ) with the number of the chunks it will send. Example: command 4,20,30,40,50 Where command would be something like instant-message or file,4 would be the number of chunks to be sent, 20 would be the size in bytes of the first chunk, 30 of the 2nd, and so forth. after the message was sent, the client/server will start sending chunks ( of sizes mentioned in the sent message ). What do you think about implementing the client/server communication this way? What better options are there?

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  • Jersey non blocking client

    - by Pavel Bucek
    Although Jersey already have support for making asynchronous requests, it is implemented by standard blocking way - every asynchronous request is handled by one thread and that thread is released only after request is completely processed. That is OK for lots of cases, but imagine how that will work when you need to do lots of parallel requests. Of course you can limit (and its really wise thing to do, you do want control your resources) number of threads used for asynchronous requests, but you'll get another maybe not pleasant consequence - obviously processing time will incerase. There are few projects which are trying to deal with that problem, commonly named as async http clients. I didn't want to "re-implement a wheel" and I decided I'll use AHC - Async Http Client made by Jeanfrancois Arcand. There is also interesting implementation from Apache - HttpAsyncClient, but it is still in "very early stages of development" and others haven't been in similar or better shape as AHC. How this works? Non-blocking clients allow users to make same asynchronous requests as we can do with standard approach but implementation is different - threads are better utilized, they don't spend most of time in idle state. Simply described - when you make a request (send it over the network), you are waiting for reply from other side. And there comes main advantage of non-blocking approach - it uses these threads for further work, like making other requests or processing responses etc.. Idle time is minimized and your resources (threads) will be far better used. Who should consider using this? Everyone who is making lots of asynchronous requests. I haven't done proper benchmark yet, but some simple dumb tests are showing huge improvement in cases where lots of concurrent asynchronous requests are made in short period. Last but not least - this module is still experimental, so if you don't like something or if you have ideas for improvements/any feedback, feel free to comment this blog post, send mail to [email protected] or contact me personally. All feedback is greatly appreciated! maven dependency (will be present in java.net maven 2 repo by the end of the day): link: http://download.java.net/maven/2/com/sun/jersey/experimental/jersey-non-blocking-client <dependency> <groupId>com.sun.jersey.experimental</groupId> <artifactId>jersey-non-blocking-client</artifactId> <version>1.9-SNAPSHOT</version> </dependency> code snippet: ClientConfig cc = new DefaultNonBlockingClientConfig(); cc.getProperties().put(NonBlockingClientConfig.PROPERTY_THREADPOOL_SIZE, 10); // default value, feel free to change Client c = NonBlockingClient.create(cc); AsyncWebResource awr = c.asyncResource("http://oracle.com"); Future<ClientResponse> responseFuture = awr.get(ClientResponse.class); // or awr.get(new TypeListener<ClientResponse>(ClientResponse.class) { @Override public void onComplete(Future<ClientResponse> f) throws InterruptedException { ... } }); javadoc (temporary location, won't be updated): http://anise.cz/~paja/jersey-non-blocking-client/

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  • When Installing Oracle Client 11.1.0.7 can I use a common directory for Oracle Base?

    - by Anders
    I am trying to install Oracle Client 11.1.0.7 on a Windows Server 2008 64-bit. To some this might not be rocket science but I can't understand what the options under the install screen "Specify Home Details" mean. The defaults given suggest that I use Oracle Base and install software under my own account name. It also suggests that each user should have a separate Oracle Base. This seems counter intuitive to me. I am doing a server install after all. All I want to use the installation for is to connect to an Oracle Database from Reporting Services. Can I safely ignore this and just accept the defaults? What are the implications if I change the location to a common directory?

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  • Why does terminal prompt text becomes black when connecting to Ubuntu with Nomachine NX client?

    - by David B
    I'm using Nomachine NX client for Windows to remotely connect to my Ubuntu. Every now and then I experience a strange phenomena: the text in the prompt of all open terminal windows becomes black, so it can't be viewed over the black background. Typed commands are also black, but the results are in normal colors. So I can run stuff, but can't see what I'm typing... After I close all open terminal windows and start a new terminal window, everything goes back to normal. This is rerally annoying and happens quite often. Any idea why?

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  • Is there a BitTorrent client that can download files "in sequence"?

    - by Bob M
    Is there a BitTorrent client that can download files "in sequence"? For example, download clip 01.avi (high priority) clip 02.avi (normal priority) clip 03.avi (low priority) clip 04.avi (low) clip 05.avi (low) then when clip 01.avi is done, it will automatically make it: clip 01.avi (high priority) clip 02.avi (high priority) clip 03.avi (normal priority) clip 04.avi (low priority) clip 05.avi (low) this can be useful when download *.rar as well, since download clip.rar, and then clip.r00, r01, r02, in sequence can allow previewing the file by using RAR to recompose the file (even though incomplete file, but will allow previewing). Update: will making all files active still considered a bad use of BT?

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  • Backup Client/Server Software that Syncs only the Delta?

    - by Urda
    I have a co-located server, and a desktop computer. I push small things and large ammounts of small files (like my iTunes) into a JungleDisk cloud. If a few files change there, no big deal, the file gets re-uped. For larger files JungleDisk backup isn't helpful. Things like movies and VMware images that change a lot, but I want backed up. Just not to JungleDisk since that would cost me even more money. I am looking for a product, closed or open source (preferably open source) that will sync the change, or delta, to my personal server on a schedule. That way I can keep a copy of my larger things, without paying JungleDisk a ton more since they are in the range of many Gigabytes. Right now these few items are backed up over FTP, and take forever. Both the client and server are windows environments.

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  • Installing Oracle Client 11.1.0.7 on Windows Server 2008 64-bit. What does "Install Location" and "S

    - by Anders
    I am trying to install Oracle Client 11.1.0.7 on a Windows Server 2008 64-bit. To some this might not be rocket science but I can't understand what the options under the install screen "Specify Home Details" mean. The defaults given suggest that I use Oracle Base and install software under my own account name. It also suggests that each user should have a separate Oracle Base. This seems counter intuitive to me. I am doing a server install after all. All I want to use the installation for is to connect to an Oracle Database from Reporting Services. Can I safely ignore this and just accept the defaults? What are the implications if I change the location to a common directory?

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  • Client PC not booting when certain TFT plugged in - TFT or graphics card failure?

    - by Chake
    here comes something quite strange: On a client machine (DELL Vostro 420) we experienced problems when booting: when turning on the machine beeps normal but doesn't display anything and doesn't boot. After some testing I found out, that this only happens if one (of the two) monitors (Iiyama ProLite E2472HDD) is plugged in while booting. If the other monitor (TFT 2) is plugged in everything is fine. Here a small illustration, TFT 1 is the bad guy: TFT 1 | TFT 2 | failure x | x | x x | | x | x | After BIOS-Phase I can safely plug in TFT 1 and everything works just fine. The question is, what can be done to avoide this behavior: Change monitor? (Iiyama ProLite E2472HDD) Change graphics card? (GeForce 9800 GT) Other suggestions?

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  • Java, server client TCP communication ends with RST

    - by Senne
    I'm trying to figure out if this is normal. Because without errors, a connection should be terminated by: FIN -> <- ACK <- FIN ACK -> I get this at the end of a TCP connection (over SSL, but i also get it with non-encrypted): From To 1494 server client TCP search-agent > 59185 [PSH, ACK] Seq=25974 Ack=49460 Win=63784 Len=50 1495 client server TCP 59185 > search-agent [ACK] Seq=49460 Ack=26024 Win=63565 Len=0 1496 client server TCP 59185 > search-agent [PSH, ACK] Seq=49460 Ack=26024 Win=63565 Len=23 1497 client server TCP 59185 > search-agent [FIN, ACK] Seq=49483 Ack=26024 Win=63565 Len=0 1498 server client TCP search-agent > 59185 [PSH, ACK] Seq=26024 Ack=49484 Win=63784 Len=23 1499 client server TCP 59185 > search-agent [RST, ACK] Seq=49484 Ack=26047 Win=0 Len=0 The client exits normally and reaches socket.close, shouldn't then the connection be shut down normally, without a reset? I can't find anything about the TCP streams of java on google... Here is my code: Server: package Security; import java.io.*; import java.net.*; import javax.net.ServerSocketFactory; import javax.net.ssl.*; import java.util.*; public class SSLDemoServer { private static ServerSocket serverSocket; private static final int PORT = 1234; public static void main(String[] args) throws IOException { int received = 0; String returned; ObjectInputStream input = null; PrintWriter output = null; Socket client; System.setProperty("javax.net.ssl.keyStore", "key.keystore"); System.setProperty("javax.net.ssl.keyStorePassword", "vwpolo"); System.setProperty("javax.net.ssl.trustStore", "key.keystore"); System.setProperty("javax.net.ssl.trustStorePassword", "vwpolo"); try { System.out.println("Trying to set up server ..."); ServerSocketFactory factory = SSLServerSocketFactory.getDefault(); serverSocket = factory.createServerSocket(PORT); System.out.println("Server started!\n"); } catch (IOException ioEx) { System.out.println("Unable to set up port!"); ioEx.printStackTrace(); System.exit(1); } while(true) { client = serverSocket.accept(); System.out.println("Client trying to connect..."); try { System.out.println("Trying to create inputstream..."); input = new ObjectInputStream(client.getInputStream()); System.out.println("Trying to create outputstream..."); output = new PrintWriter(client.getOutputStream(), true); System.out.println("Client successfully connected!"); while( true ) { received = input.readInt(); returned = Integer.toHexString(received); System.out.print(" " + received); output.println(returned.toUpperCase()); } } catch(SSLException sslEx) { System.out.println("Connection failed! (non-SSL connection?)\n"); client.close(); continue; } catch(EOFException eofEx) { System.out.println("\nEnd of client data.\n"); } catch(IOException ioEx) { System.out.println("I/O problem! (correct inputstream?)"); } try { input.close(); output.close(); } catch (Exception e) { } client.close(); System.out.println("Client closed.\n"); } } } Client: package Security; import java.io.*; import java.net.*; import javax.net.ssl.*; import java.util.*; public class SSLDemoClient { private static InetAddress host; private static final int PORT = 1234; public static void main(String[] args) { System.setProperty("javax.net.ssl.keyStore", "key.keystore"); System.setProperty("javax.net.ssl.keyStorePassword", "vwpolo"); System.setProperty("javax.net.ssl.trustStore", "key.keystore"); System.setProperty("javax.net.ssl.trustStorePassword", "vwpolo"); System.out.println("\nCreating SSL socket ..."); SSLSocket socket = null; try { host = InetAddress.getByName("192.168.56.101"); SSLSocketFactory factory = (SSLSocketFactory) SSLSocketFactory.getDefault(); socket = (SSLSocket) factory.createSocket(host, PORT); socket.startHandshake(); } catch(UnknownHostException uhEx) { System.out.println("\nHost ID not found!\n"); System.exit(1); } catch(SSLException sslEx) { System.out.println("\nHandshaking unsuccessful ..."); System.exit(1); } catch (IOException e) { e.printStackTrace(); } System.out.println("\nHandshaking succeeded ...\n"); SSLClientThread client = new SSLClientThread(socket); SSLReceiverThread receiver = new SSLReceiverThread(socket); client.start(); receiver.start(); try { client.join(); receiver.join(); System.out.println("Trying to close..."); socket.close(); } catch(InterruptedException iEx) { iEx.printStackTrace(); } catch(IOException ioEx) { ioEx.printStackTrace(); } System.out.println("\nClient finished."); } } class SSLClientThread extends Thread { private SSLSocket socket; public SSLClientThread(SSLSocket s) { socket = s; } public void run() { try { ObjectOutputStream output = new ObjectOutputStream(socket.getOutputStream()); for( int i = 1; i < 1025; i++) { output.writeInt(i); sleep(10); output.flush(); } output.flush(); sleep(1000); output.close(); } catch(IOException ioEx) { System.out.println("Socket closed or unable to open socket."); } catch(InterruptedException iEx) { iEx.printStackTrace(); } } } class SSLReceiverThread extends Thread { private SSLSocket socket; public SSLReceiverThread(SSLSocket s) { socket = s; } public void run() { String response = null; BufferedReader input = null; try { input = new BufferedReader( new InputStreamReader(socket.getInputStream())); try { response = input.readLine(); while(!response.equals(null)) { System.out.print(response + " "); response = input.readLine(); } } catch(Exception e) { System.out.println("\nEnd of server data.\n"); } input.close(); } catch(IOException ioEx) { ioEx.printStackTrace(); } } }

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  • Google I/O 2012 - Building Web Applications using Google APIs and JavaScript Client for Google APIs

    Google I/O 2012 - Building Web Applications using Google APIs and JavaScript Client for Google APIs Brendan O'Brien In this session, you will learn how to use the features of the Google API client for JavaScript to build rich web applications. Some of the features we will demonstrate include authentication and CORS. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 866 8 ratings Time: 52:00 More in Science & Technology

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  • Security aspects of an ASP.NET that can be pointed out to the client

    - by Maxim V. Pavlov
    I need to write several passages of text in an offer to the client about the security layer in ASP.NET MVC web solution. I am aware of security that comes along with MVC 3 and an improvements in MVC 4. But all of them are non conceptual, except for AntiForgeryToken (AntiXSS) and built-in SQL Injection immunity (with a little of encoding needed by hand). What would be the main point of ASP.NET security I can "show off" in an offer to the client?

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  • Client Centric Approach of AJAX using Toolkit

    In this article, the author discusses the client-centric approach for AJAX using the ASP.NET AJAX Toolkit. In general, server-centric (use of Update panel) is very popular in this field. But when it comes to performance, the client-centric approach is preferred. Sandeep also demonstrates how to call a webservice using javascript.

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  • Which email client works best with GMail IMAP?

    - by Ivan
    I use GMail (and I use labels intensively) and because of having to use a very slow Internet connection now I've came to the idea that I should try using a desktop email client. What application (Thunderbird, Evolution, Claws, or some another) works best with GMail via IMAP? First of all I want correct GMail labels support (for example an email client shouldn't think of GMail labels as of independent folders, treating messages with multiple labels as multiple different identical messages in different folders), incl. special GMail labels-folders like bin, spam, drafts and sent.

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  • More on PHP and Oracle 11gR2 Improvements to Client Result Caching

    - by christopher.jones
    Oracle 11.2 brought several improvements to Client Result Caching. CRC is way for the results of queries to be cached in the database client process for reuse.  In an Oracle OpenWorld presentation "Best Practices for Developing Performant Application" my colleague Luxi Chidambaran had a (non-PHP generated) graph for the Niles benchmark that shows a DB CPU reduction up to 600% and response times up to 22% faster when using CRC. Sometimes CRC is called the "Consistent Client Cache" because Oracle automatically invalidates the cache if table data is changed.  This makes it easy to use without needing application logic rewrites. There are a few simple database settings to turn on and tune CRC, so management is also easy. PHP OCI8 as a "client" of the database can use CRC.  The cache is per-process, so plan carefully before caching large data sets.  Tables that are candidates for caching are look-up tables where the network transfer cost dominates. CRC is really easy in 11.2 - I'll get to that in a moment.  It was also pretty easy in Oracle 11.1 but it needed some tiny application changes.  In PHP it was used like: $s = oci_parse($c, "select /*+ result_cache */ * from employees"); oci_execute($s, OCI_NO_AUTO_COMMIT); // Use OCI_DEFAULT in OCI8 <= 1.3 oci_fetch_all($s, $res); I blogged about this in the past.  The query had to include a specific hint that you wanted the results cached, and you needed to turn off auto committing during execution either with the OCI_DEFAULT flag or its new, better-named alias OCI_NO_AUTO_COMMIT.  The no-commit flag rule didn't seem reasonable to me because most people wouldn't be specific about the commit state for a query. Now in Oracle 11.2, DBAs can now nominate tables for caching, either with CREATE TABLE or ALTER TABLE.  That means you don't need the query hint anymore.  As well, the no-commit flag requirement has been lifted.  Your code can now look like: $s = oci_parse($c, "select * from employees"); oci_execute($s); oci_fetch_all($s, $res); Since your code probably already looks like this, your DBA can find the top queries in the database and simply tune the system by turning on CRC in the database and issuing an ALTER TABLE statement for candidate tables.  Voila. Another CRC improvement in Oracle 11.2 is that it works with DRCP connection pooling. There is some fine print about what is and isn't cached, check the Oracle manuals for details.  If you're using 11.1 or non-DRCP "dedicated servers" then make sure you use oci_pconnect() persistent connections.  Also in PHP don't bind strings in the query, although binding as SQLT_INT is OK.

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  • Google I/O 2010 - Android REST client applications

    Google I/O 2010 - Android REST client applications Google I/O 2010 - Developing Android REST client applications Android 301 Virgil Dobjanschi This session will present architectural considerations for developing RESTful applications on the Android platform. It focuses on design patterns, platform integration and performance issues specific to the Android platform. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 3 0 ratings Time: 59:42 More in Science & Technology

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  • Tweeting through the Genesis Smart Client Framework

    This article demonstrates a basic Twitter client as a Genesis Hosted Application for the Genesis Smart Client Framework...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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  • Ubuntu One Client 3.02 for windows - Authentication Failure signing in with existing account

    - by steigerj
    I have logged into ubuntu one using a browser successfully. But using the very same login email address and password in the windows client 3.02 gets me an 'authentication failed' message. I am 100% sure I used the same email address and password. My password does not contain any non-ascii characters. Someone suggested to use an older version of the client. Where could i possibly download a complete installer?

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