Concurrency level provided by the mail and VFS transports listeners is
insufficient
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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
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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