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From "Asankha C. Perera (JIRA)" <j...@apache.org>
Subject [jira] Created: (HTTPCORE-23) Threading issue with NIO extensions for client side code
Date Fri, 12 Jan 2007 18:23:27 GMT
Threading issue with NIO extensions for client side code
--------------------------------------------------------

                 Key: HTTPCORE-23
                 URL: https://issues.apache.org/jira/browse/HTTPCORE-23
             Project: HttpComponents Core
          Issue Type: Bug
          Components: HttpCore NIO
    Affects Versions: 4.0-alpha3
            Reporter: Asankha C. Perera


I would like to write a non-blocking client based on the NIO extensions, but encounter an
issue, which could be reproduced with a modified NHttpClient example code as follows:

I want to start off a ConnectingIOReactor, and leave it running continuously. Now, whenever
I want to send a request through this reactor, I would want to execute something like
   ioReactor.connect(
           new InetSocketAddress("www.yahoo.com", 80),
           null,
           new HttpHost("www.yahoo.com"));

However, if I execute the above before I execute ioReactor.execute(ioEventDispatch), i.e position
1, then everything works fine. If I try it after (i.e. position 2) the outcome is unpredictable
- i.e. works sometimes, NPE, etc..

It is not clear to me why connecting to the reactor after its execute() method is invoked
should be any different..?

public static void main(String[] args) throws Exception {
       HttpParams params = new DefaultHttpParams(null);
       .....
       NHttpClientHandler handler = new MyNHttpClientHandler(params);
       final IOEventDispatch ioEventDispatch = new DefaultClientIOEventDispatch(handler, params);

       // position 1                    Thread t = new Thread(new Runnable() {
           public void run() {
               try {
                   ioReactor.execute(ioEventDispatch);
               } catch (Exception e) {
                   e.printStackTrace();
               }
           }
       }
       );
       t.start();

       // position 2
   } 

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