ExternalizerTable not detecting cache manager shutdown for provided channels

During clean shutdown of AS7, we occasionally see log messages like the below stack trace. To detect that the cache manager is being shutdown, ExternalizerTable checks both a "started" boolean flag and the interrupted status of the up handler thread. In the AS, however, the cache manager does not control the lifecycle of the channel - a channel does not stop until its dependent services (e.g. the cache manager) have already stopped. So, the incoming message handling thread won't be interrupted. Objects like ExternalizerTable need to use some other mechanism to distinguish "shutting down" from "not yet started".

[JBossINF] 12:28:22,463 WARN [org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher] Problems unmarshalling remote command from byte buffer: org.infinispan.CacheException: Cache manager is either starting up or shutting down but it's not interrupted, so type (id=74) cannot be resolved.
[JBossINF] at org.infinispan.marshall.jboss.ExternalizerTable.readObject(ExternalizerTable.java:257) [infinispan-core-5.1.0.CR1.jar:5.1.0.CR1]
[JBossINF] at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:351)
[JBossINF] at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:209)
[JBossINF] at org.jboss.marshalling.AbstractObjectInput.readObject(AbstractObjectInput.java:37) [jboss-marshalling-1.3.4.GA.jar:1.3.4.GA]
[JBossINF] at org.infinispan.marshall.jboss.AbstractJBossMarshaller.objectFromObjectStream(AbstractJBossMarshaller.java:120) [infinispan-core-5.1.0.CR1.jar:5.1.0.CR1]
[JBossINF] at org.infinispan.marshall.VersionAwareMarshaller.objectFromByteBuffer(VersionAwareMarshaller.java:115) [infinispan-core-5.1.0.CR1.jar:5.1.0.CR1]
[JBossINF] at org.infinispan.marshall.AbstractDelegatingMarshaller.objectFromByteBuffer(AbstractDelegatingMarshaller.java:79) [infinispan-core-5.1.0.CR1.jar:5.1.0.CR1]
[JBossINF] at org.infinispan.remoting.transport.jgroups.MarshallerAdapter.objectFromBuffer(MarshallerAdapter.java:50) [infinispan-core-5.1.0.CR1.jar:5.1.0.CR1]
[JBossINF] at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.handle(CommandAwareRpcDispatcher.java:139) [infinispan-core-5.1.0.CR1.jar:5.1.0.CR1]
[JBossINF] at org.jgroups.blocks.RequestCorrelator.handleRequest(RequestCorrelator.java:447) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.blocks.RequestCorrelator.receiveMessage(RequestCorrelator.java:354) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.blocks.RequestCorrelator.receive(RequestCorrelator.java:230) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.up(MessageDispatcher.java:556) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jboss.as.clustering.jgroups.ClassLoaderAwareUpHandler.up(ClassLoaderAwareUpHandler.java:56) [jboss-as-clustering-jgroups-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
[JBossINF] at org.jgroups.blocks.mux.MuxUpHandler.up(MuxUpHandler.java:130) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jboss.as.clustering.jgroups.MuxChannel$ClassLoaderAwareMuxUpHandler.up(MuxChannel.java:64) [jboss-as-clustering-jgroups-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT]
[JBossINF] at org.jgroups.JChannel.up(JChannel.java:716) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:1026) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.pbcast.FLUSH.up(FLUSH.java:481) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.pbcast.STATE_TRANSFER.up(STATE_TRANSFER.java:178) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.FRAG2.up(FRAG2.java:181) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.FlowControl.up(FlowControl.java:400) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.FlowControl.up(FlowControl.java:418) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.pbcast.GMS.up(GMS.java:881) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:244) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.UNICAST2.up(UNICAST2.java:383) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.pbcast.NAKACK.handleMessage(NAKACK.java:733) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.pbcast.NAKACK.up(NAKACK.java:561) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.BARRIER.up(BARRIER.java:126) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:140) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.FD.up(FD.java:273) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:284) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.MERGE2.up(MERGE2.java:205) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.Discovery.up(Discovery.java:354) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.stack.Protocol.up(Protocol.java:358) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.TP.passMessageUp(TP.java:1174) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.TP$IncomingPacket.handleMyMessage(TP.java:1709) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at org.jgroups.protocols.TP$IncomingPacket.run(TP.java:1691) [jgroups-3.0.1.Final.jar:3.0.1.Final]
[JBossINF] at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_29]
[JBossINF] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_29]
[JBossINF] at java.lang.Thread.run(Thread.java:662) [:1.6.0_29]