[jbossts-issues] [JBoss JIRA] Created: (JBTM-503) Shutdown the ExpiredEntryMonitor when stopping the RecoveryManager

[Mauro Molinari (JIRA)]

Shutdown the ExpiredEntryMonitor when stopping the RecoveryManager
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                 Key: JBTM-503
                 URL: https://jira.jboss.org/jira/browse/JBTM-503
             Project: JBoss Transaction Manager
          Issue Type: Feature Request
      Security Level: Public (Everyone can see)
          Components: Recovery
    Affects Versions: 4.5
         Environment: Tomcat + Spring + DBCP + JBossJTA
            Reporter: Mauro Molinari


When the recovery manager is started, the implementation RecoveryManagerImple starts the ExpiredEntryMonitor.
When you stop the recovery manager, however, the ExpiredEntryMonitor is not shut down.

On line 250 of com.arjuna.ats.internal.arjuna.recovery.RecoveryManagerImple there's the line ExpiredEntryMonitor.shutdown() commented out, with a "TODO why?" comment immediately before.

I don't know exactly what should be the lifecylce of ExpiredEntryMonitor versus that of RecoveryManagerImple, however I think that one of the following should happen:
- ExpiredEntryMonitor is started when RecoveryManagerImple is started (rather than constructed), so that it is shut down when the RecoveryManagerImple is stopped
OTHERWISE
- RecoveryManagerImple provides a way to "dispose" or "disable" it and this includes the shutdown of ExpiredEntryMonitor
OTHERWISE
- it is documented that stopping the recovery manager needs the ExpiredEntryMonitor to be stopped too: however, please consider that com.arjuna.ats.internal.arjuna.recovery.ExpiredEntryMonitor.shutdown() throws a NullPointerException if called while the ExpiredEntryMonitor has not been started before and there is no public method to test if it has been started or not; so if I need to write some code that stops the ExpiredEntryMonitor (without knowing if it has been started or not) I have to write some ugly code like:

{code:java}
try
{
  ExpiredEntryMonitor.shutdown();
}
catch(final NullPointerException e)
{
  // ExpiredEntryMonitor had not been started
}
{code}

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