Fix race in JNIDDetector
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Key: JBREM-846
URL:
http://jira.jboss.com/jira/browse/JBREM-846
Project: JBoss Remoting
Issue Type: Bug
Security Level: Public (Everyone can see)
Affects Versions: 2.2.2.SP2, 2.2.2.GA_CP01, 2.4.0.Beta1 (Pinto)
Reporter: Ron Sigal
Assigned To: Ron Sigal
Fix For: 2.4.0.Beta1 (Pinto)
When the org.jboss.remoting.detection.jndi.JNDIDetector heartbeat thread does a clean
detect and discovers that a server is unreachable, it calls checkInvokerServer(), which,
among other things, tells its org.jboss.remoting.network.NetworkRegistry to inform
listeners of the loss of a server. It then calls
org.jboss.remoting.detection.AbstractDetector.detect(), passing the
org.jboss.remoting.detection.Detection representing the server that is no longer
available. However, detect() treats the Detection as a *new* server, and it tells its
org.jboss.remoting.network.NetworkRegistry to inform listeners of a new server.
This problem was turned up by the occasional failure of
org.jboss.test.remoting.detection.jndi.RestartTestCase. The test fails inconsistently
because NetworkRegistry sends its notifications in separate threads, and RestartTestCase
is expecting to hear that (1) the old server has died, and (2) a new server has replaced
it. If the notifications are received in order, than the test passes, and if they are
received out of order it fails.
The solution is simply to not call AbstractInvoker.detect() when a server has died.
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