JMSFlow routes to components before they're started
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Key: SM-337
URL: http://jira.activemq.org/jira//browse/SM-337
Project: ServiceMix
Type: Bug
Components: servicemix-core
Versions: 3.0, 2.0.2
Environment: Windows XP, SM 2.0.2
Reporter: Michael Studman
I'm currently developing against 2.0.2 but my inspection of SVN seems to show
this problem is in 3.0 too.
So I have three ServiceMix containers each using JMSFlow. There are two
networked ActiveMQ brokers (tcp:server1 tcp:server2) and the containers'
jmsURL pointing to them both via "reliable:(tcp:server1,tcp:server2).
I'm trying to simulate one of the containers leaving the cluster (killing the
JVM with Ctrl-C) and then rejoining it to see how the cluster handles
clustering and load balancing under this scenario. What I'm seeing is generally
good but my MessageExchangeListener implementing-component in the rejoining
container is receiving messages before its init() or start() methods are called.
I think I've tracked down the problem and it seems to be one of ordering
between the registry, flow and auto-deployer. When the auto-deployer calls
JBIContainer.activateComponent(...) for my component this causes
Registry.registerComponent(...) to fire an event which is handled by
JMSFlow.onEvent(ComponentEventPacket). onEvent here notifies the cluster of the
new component which gives the green light for others in the cluster to deliver
messages for the named component to this container.
The problem is when Registry.registerComponent(...) is called the component
hasn't yet been started but it is already added to the registry's map and
subsequently found when JMSFlow receives a request from elsewhere in the
cluster. A cursory glance at the SVN repository indicates to me this is still a
problem with 3.0.
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