Cache results in Topic exchange from routingkey lookup.
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                 Key: QPID-770
                 URL: https://issues.apache.org/jira/browse/QPID-770
             Project: Qpid
          Issue Type: Improvement
          Components: Java Broker
    Affects Versions: M2.1
            Reporter: Martin Ritchie


The current naive topic exchange in the java broker creates a lot of garbage 
for every message. In a production system that will have very small number of 
changes to the subscriptions it would be more efficient to cache the results of 
the routingkey lookup and so not have the garbage over head from parsing the 
routingkey.

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