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From "Emmanuel Lecharny (JIRA)" <j...@apache.org>
Subject [jira] Closed: (DIRMINA-419) about the Proxy example
Date Sun, 07 Jun 2009 07:46:08 GMT

     [ https://issues.apache.org/jira/browse/DIRMINA-419?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Emmanuel Lecharny closed DIRMINA-419.
-------------------------------------

    Resolution: Fixed

2 years old issue, 5 versions ago... Let's close it.

> about the Proxy example
> -----------------------
>
>                 Key: DIRMINA-419
>                 URL: https://issues.apache.org/jira/browse/DIRMINA-419
>             Project: MINA
>          Issue Type: Bug
>          Components: Example
>    Affects Versions: 1.1.2
>            Reporter: im-james
>
> I've been using the proxy example and I've discovered a bug.
> The IOHandler that handles the communication with the server (proxy <---->server)
I've found a situation where the handler receives a messageReceived event and then a sessionClosed
event in a very short time period. The result is that the bytes received in the proxy are
not sent to the client. The connection to the client is closed before the message had a chance
to be written.
> It is hard to explain the problem so here is a log trace showing what happens when everything
goes well:
> 12:36:05,429 DEBUG [SocketAcceptorIoProcessor-0.0] connectionProxy.ClientToProxyIoHandler
- [/127.0.0.1:14784] sessionOpened
> 12:36:05,461 DEBUG [SocketAcceptorIoProcessor-0.0] connectionProxy.ClientToProxyIoHandler
- [/127.0.0.1:14784] messageReceived 8
> 12:36:05,461 DEBUG [Thread-1] connectionProxy.test.TestAppServer - server has received
and sent data back
> 12:36:05,461 DEBUG [AnonymousIoService-7] connectionProxy.ServerToProxyIoHandler - [/127.0.0.1:80]
messageSent 8
> 12:36:05,461 DEBUG [AnonymousIoService-7] connectionProxy.ServerToProxyIoHandler - [/127.0.0.1:80]
messageReceived 8
> 12:36:05,461 DEBUG [SocketAcceptorIoProcessor-0.0] connectionProxy.ClientToProxyIoHandler
- [/127.0.0.1:14784] messageSent 8
> 12:36:05,461 DEBUG [AnonymousIoService-7] connectionProxy.ServerToProxyIoHandler - [/127.0.0.1:80]
sessionClosed   0
> 12:36:05,461 DEBUG [SocketAcceptorIoProcessor-0.0] connectionProxy.ClientToProxyIoHandler
- [/127.0.0.1:14784] sessionClosed
> 12:36:05,461 DEBUG [Thread-5] connectionProxy.test.TestClient - client has received the
data
> And this is a log trace that shows the problem:
> 12:38:00,554 DEBUG [SocketAcceptorIoProcessor-0.0] connectionProxy.ClientToProxyIoHandler
- [/127.0.0.1:14904] sessionOpened
> 12:38:00,570 DEBUG [SocketAcceptorIoProcessor-0.0] connectionProxy.ClientToProxyIoHandler
- [/127.0.0.1:14904] messageReceived 8
> 12:38:00,586 DEBUG [Thread-1] connectionProxy.test.TestAppServer - server has received
and sent data back
> 12:38:00,586 DEBUG [AnonymousIoService-12] connectionProxy.ServerToProxyIoHandler - [/127.0.0.1:80]
messageSent 8
> 12:38:00,586 DEBUG [AnonymousIoService-12] connectionProxy.ServerToProxyIoHandler - [/127.0.0.1:80]
messageReceived 8
> 12:38:00,586 DEBUG [AnonymousIoService-12] connectionProxy.ServerToProxyIoHandler - [/127.0.0.1:80]
sessionClosed   0
> 12:38:00,586 DEBUG [SocketAcceptorIoProcessor-0.0] connectionProxy.ClientToProxyIoHandler
- [/127.0.0.1:14904] sessionClosed
> java.io.EOFException
> 	at java.io.DataInputStream.readFully(DataInputStream.java:178)
> 	at java.io.DataInputStream.readLong(DataInputStream.java:380)
> 	at com.indeos.connectionProxy.test.TestClient.run(TestClient.java:58)
> 	at java.lang.Thread.run(Thread.java:595)	
> The EOFException says that the client has not be able to read the data before the connection
was closed.
> The conclusion is that the close can happen before the write. Thus to solve the issue
I had to add a join() in the messageReceived method such as:
> ((IoSession) session.getAttachment()).write(wb).join();
> Of course with this solution I break the asynchronous nature of the proxy. If you know
a better solution I'd like to hear it!

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