Improve Shutdown

[jfarcand]

22:35:57.470 [main] DEBUG o.a.cpr.DefaultBroadcasterFactory - Removing Broadcaster / factory size now 0 
22:35:57.478 [New I/O worker #68] DEBUG o.a.n.NettyAtmosphereHandler - Exception
java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@5bafcc2c rejected from java.util.concurrent.ScheduledThreadPoolExecutor@72858bba[Shutting down, pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 0]
    at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2048) ~[na:1.7.0_21]
    at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:821) [na:1.7.0_21]
    at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:325) ~[na:1.7.0_21]
    at java.util.concurrent.ScheduledThreadPoolExecutor.scheduleAtFixedRate(ScheduledThreadPoolExecutor.java:570) ~[na:1.7.0_21]
    at org.atmosphere.websocket.DefaultWebSocketProcessor.open(DefaultWebSocketProcessor.java:197) ~[atmosphere-runtime-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
    at org.atmosphere.nettosphere.NettyAtmosphereHandler.handleWebSocketHandshake(NettyAtmosphereHandler.java:256) ~[nettosphere-2.0.0.RC4.jar:na]
    at org.atmosphere.nettosphere.NettyAtmosphereHandler.messageReceived(NettyAtmosphereHandler.java:224) ~[nettosphere-2.0.0.RC4.jar:na]
    at org.jboss.netty.handler.stream.ChunkedWriteHandler.handleUpstream(ChunkedWriteHandler.java:142) ~[netty-3.6.6.Final.jar:na]
    at org.jboss.netty.handler.codec.http.HttpChunkAggregator.messageReceived(HttpChunkAggregator.java:145) ~[netty-3.6.6.Final.jar:na]
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296) ~[netty-3.6.6.Final.jar:na]
    at org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:459) ~[netty-3.6.6.Final.jar:na]
    at org.jboss.netty.handler.codec.replay.ReplayingDecoder.callDecode(ReplayingDecoder.java:536) ~[netty-3.6.6.Final.jar:na]
    at org.jboss.netty.handler.codec.replay.ReplayingDecoder.messageReceived(ReplayingDecoder.java:435) ~[netty-3.6.6.Final.jar:na]
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268) ~[netty-3.6.6.Final.jar:na]
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255) ~[netty-3.6.6.Final.jar:na]
    at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88) ~[netty-3.6.6.Final.jar:na]
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:109) ~[netty-3.6.6.Final.jar:na]
    at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:312) ~[netty-3.6.6.Final.jar:na]
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:90) ~[netty-3.6.6.Final.jar:na]
    at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178) ~[netty-3.6.6.Final.jar:na]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_21]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_21]
    at java.lang.Thread.run(Thread.java:722) [na:1.7.0_21]
22:35:57.482 [New I/O worker #68] DEBUG o.a.n.NettyAtmosphereHandler - null
22:35:57.488 [New I/O worker #71] DEBUG c.n.h.c.p.n.NettyAsyncHttpProvider - Channel Closed: [id: 0x2ce0d472, /127.0.0.1:35570 :> /127.0.0.1:55061] with attachment NettyResponseFuture{currentRetry=5,
    isDone=true,
    isCancelled=false,
    asyncHandler=org.atmosphere.wasync.transport.WebSocketTransport@1b67a39b,
    requestTimeoutInMs=-1,
    nettyRequest=DefaultHttpRequest(chunked: false)
``

[jfarcand]

Unable to reproduce