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From Marek.Cy...@equifax.com
Subject Proposed changes in JCS cache to shutdown gracefully
Date Mon, 09 Oct 2006 14:46:45 GMT




Aaron, all,

Here is my proposal of what needs to be changed in JCS cache to gracefully
handle remote cache shutdown when using TCP lateral cache & UDP Discovery
mechanism.

Issue:
When shutting down one JVM, all other JVMs start reporting lateral cache
errors because they cannot connect to the cache that was just shut down.

Proposed solution:
- add a new message type to UDPDiscoveryMessage.java:
    /*
     * Added to handle graceful shutdowns of remote caches
     */
    public static final int SHUTDOWN_BROADCAST = 2;

- modify UDPDiscoveryService to send this message when instance is shutting
down (in the ShutdownObserver#shutdown() method)
- modify code to handle shutdown messages correctly (remove
LateralCacheNoWait from noWaits in the LateralCacheNoWaitFacade)

Attached is source code of all files that I had to modify to get this to
work:
(See attached file: LateralCacheNoWaitFacade.java)
(
added   public boolean removeNoWait( LateralCacheNoWait noWait ) method
)

(See attached file: LateralTCPCacheManager.java)
(
added   public static LateralTCPCacheManager removeInstance(
ITCPLateralCacheAttributes lca, ICompositeCacheManager cacheMgr ) method,
)

(See attached file: UDPDiscoveryMessage.java)
(
added new message type:
    /*
     * Added to handle graceful shutdowns of remote caches
     */
    public static final int SHUTDOWN_BROADCAST = 2;
)

(See attached file: UDPDiscoveryService.java)
(
modified the   public void shutdown() method,
added   protected void serviceShutdownBroadcast() method,
added   protected void removeNoWait( LateralCacheNoWait noWait )
)
(See attached file: UDPDiscoverySender.java)
(
added   public void shutdownBroadcast( String host, int port, ArrayList
cacheNames ) throws IOException method
)

(See attached file: UDPDiscoveryReceiver.java)
(
modified         public void run() method of MessageHandler
)

Is there any way I can get these changes incorporated into "official" JCS
cache source code?

Thanks,

Marek Cyzio
Equifax
(770)740-6610
Marek.Cyzio@equifax.com



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