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From "Asankha C. Perera (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SYNAPSE-434) Concurrency level provided by the mail and VFS transports listeners is insufficient
Date Sat, 21 Mar 2009 05:08:50 GMT

    [ https://issues.apache.org/jira/browse/SYNAPSE-434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12685418#action_12685418
] 

Asankha C. Perera commented on SYNAPSE-434:
-------------------------------------------

The reason I did this was to actually prevent concurrent processing by Mail, VFS etc., where
we do not want to say process the same file/email by two threads concurrently.. Do you have
a proposed solution to prevent that?

> Concurrency level provided by the mail and VFS transports listeners is insufficient
> -----------------------------------------------------------------------------------
>
>                 Key: SYNAPSE-434
>                 URL: https://issues.apache.org/jira/browse/SYNAPSE-434
>             Project: Synapse
>          Issue Type: Bug
>          Components: Transports
>    Affects Versions: 1.2
>            Reporter: Andreas Veithen
>            Assignee: Andreas Veithen
>            Priority: Minor
>
> Scenario:
> * Two services are configured to use the (mail or VFS) transport.
> * Two messages are sent two each of these services.
> In this case, one would expect that the transport listener will be able to process at
least 2 (better 4) messages concurrently. However the listener currently only processes one
message at a time, i.e. the listener behaves as if it was single-threaded.
> There are two reasons for this:
> 1. AbstractPollingTransportListener contains the following code:
> workerPool.execute(new Runnable() {
>     public void run() {
>         synchronized (pollLock) {
>             pollInProgress = true;
>             try {
>                 onPoll();
>             } finally {
>                 pollInProgress = false;
>             }
>         }
>     }
> });
> Since pollLock is a member of AbstractPollingTransportListener, there can only be one
poll in progress at a time, even if several services are configured to use the transport (in
which case nothing would prevent the transport from executing the polls for the different
services in parallel).
> 2. Both MailTransportListener and VFSTransportListener process incoming messages sequentially.
Here again, the transport could process several messages in parallel during the execution
of the onPoll method.

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