Replace WeakReference use with SoftReference for enhanced message caching
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                 Key: QPID-2466
                 URL: https://issues.apache.org/jira/browse/QPID-2466
             Project: Qpid
          Issue Type: Improvement
          Components: Java Broker
    Affects Versions: 0.6
         Environment: JVM 1.6.0_18
            Reporter: Andrew Kennedy
             Fix For: 0.7


Replace use of WeakReference with SoftReference in the message handles in the 
broker to improve message cache performance when using a persistent store. Also 
tuning the eviction policy for soft references and evaluation of other GC 
settings.

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