cache WMS GetMapProducers to void expensive lookup specially under high 
concurrency
-----------------------------------------------------------------------------------

                 Key: GEOS-3678
                 URL: http://jira.codehaus.org/browse/GEOS-3678
             Project: GeoServer
          Issue Type: Improvement
          Components: WMS
    Affects Versions: 2.0.0
            Reporter: Gabriel Roldán
            Assignee: Gabriel Roldán
             Fix For: 2.0.1, 2.0.x


{{WMSExtensions.findMapProducers}} is used for each and every GetMap request 
and the lookup might be quite expensive. Cache the producers with a 
SoftReference to minimize the performance penalty under load

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