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https://issues.apache.org/jira/browse/WINK-175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12753607#action_12753607
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Bryant Luk commented on WINK-175:
---------------------------------
Yes, Doug has multiple threads running (4-CPU machine and 15 concurrent client
threads).
ConcurrentHashMap is able to perform the get()s without needing to acquire a
lock. The (what I believe) common usage scenario that we're looking at is an
application that reads/writes the same type of data repeatedly.
> Change ProvidersRegistry MediaTypeMap to allow gets to be faster
> ----------------------------------------------------------------
>
> Key: WINK-175
> URL: https://issues.apache.org/jira/browse/WINK-175
> Project: Wink
> Issue Type: Improvement
> Components: Common
> Affects Versions: 0.2
> Reporter: Bryant Luk
> Fix For: 0.2
>
>
> Doug Larson did some more profiling and pointed out that on the
> ProvidersRegistry MediaTypeMap, using a ConcurrentHashMap over
> SimpleConcurrentMap actually improves performance by a few percentage points.
> {code}
> private final SimpleMap<Class<?>, SoftReference<SimpleMap<MediaType,
> List<ObjectFactory<T>>>>> providersCache =
>
> new SimpleConcurrentMap<Class<?>,
> SoftReference<SimpleMap<MediaType, List<ObjectFactory<T>>>>>(); ;
> {code}
> While the cache keys (Class<?>) would not be WeakReferences, the values would
> still be SoftReferences.
> Thoughts?
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