AMQStateManager issue during connection close
---------------------------------------------
Key: QPID-378
URL: https://issues.apache.org/jira/browse/QPID-378
Project: Qpid
Issue Type: Bug
Components: Dot Net Client
Environment: .NET 2.0
Reporter: Tomas Restrepo
Occasionally, while testing the .NET client against the Java Broker, an error
will be raised during connection shutdown:
failed: Qpid.Messaging.QpidException : Error closing connection:
Qpid.AMQException: Error: System.InvalidOperationException: Collection was
modified; enumeration operation may not execute.
at System.Collections.ArrayList.ArrayListEnumeratorSimple.MoveNext()
at Qpid.Client.State.AMQStateManager.ChangeState(AMQState newState) in
E:\Opensource\qpid\dotnet\Qpid.Client\Client\State\AMQStateManager.cs:line 131
at
Qpid.Client.Handler.ConnectionOpenOkMethodHandler.MethodReceived(AMQStateManager
stateManager, AMQMethodEvent evt) in
E:\Opensource\qpid\dotnet\Qpid.Client\Client\Handler\ConnectionOpenOkMethodHandler.cs:line
30
at Qpid.Client.State.AMQStateManager.MethodReceived(AMQMethodEvent evt) in
E:\Opensource\qpid\dotnet\Qpid.Client\Client\State\AMQStateManager.cs:line 152
at Qpid.Client.Protocol.AMQProtocolListener.OnMessage(IDataBlock message) in
E:\Opensource\qpid\dotnet\Qpid.Client\Client\Protocol\AMQProtocolListener.cs:line
111 ---> System.InvalidOperationException: Collection was modified;
enumeration operation may not execute.
at System.Collections.ArrayList.ArrayListEnumeratorSimple.MoveNext()
at Qpid.Client.State.AMQStateManager.ChangeState(AMQState newState) in
E:\Opensource\qpid\dotnet\Qpid.Client\Client\State\AMQStateManager.cs:line 131
at
Qpid.Client.Handler.ConnectionOpenOkMethodHandler.MethodReceived(AMQStateManager
stateManager, AMQMethodEvent evt) in
E:\Opensource\qpid\dotnet\Qpid.Client\Client\Handler\ConnectionOpenOkMethodHandler.cs:line
30
at Qpid.Client.State.AMQStateManager.MethodReceived(AMQMethodEvent evt) in
E:\Opensource\qpid\dotnet\Qpid.Client\Client\State\AMQStateManager.cs:line 152
at Qpid.Client.Protocol.AMQProtocolListener.OnMessage(IDataBlock message) in
E:\Opensource\qpid\dotnet\Qpid.Client\Client\Protocol\AMQProtocolListener.cs:line
111
--- End of inner exception stack trace ---
at Qpid.Client.State.StateWaiter.WaituntilStateHasChanged() in
E:\Opensource\qpid\dotnet\Qpid.Client\Client\State\StateWaiter.cs:line 94
at Qpid.Client.State.AMQStateManager.AttainState(AMQState s) in
E:\Opensource\qpid\dotnet\Qpid.Client\Client\State\AMQStateManager.cs:line 220
at Qpid.Client.AMQConnection.CloseConnection() in
E:\Opensource\qpid\dotnet\Qpid.Client\Client\AMQConnection.cs:line 263
at Qpid.Client.AMQConnection.Close() in
E:\Opensource\qpid\dotnet\Qpid.Client\Client\AMQConnection.cs:line 242
E:\Opensource\qpid\dotnet\Qpid.Client\Client\AMQConnection.cs(246,0):
at Qpid.Client.AMQConnection.Close()
E:\Opensource\qpid\dotnet\Qpid.Client\Client\AMQConnection.cs(428,0):
at Qpid.Client.AMQConnection.Dispose()
The code that's causing the exception is this:
foreach (IStateListener l in _stateListeners)
{
l.StateChanged(oldState, newState);
}
I think it might be a raise condition of sorts or likely that the state manager
is not thread safe and is something is modifying the list of state listeners
during shutdown.
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