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https://issues.apache.org/jira/browse/COLLECTIONS-520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14289033#comment-14289033
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Thomas Neidhart commented on COLLECTIONS-520:
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An existing CopyOnWrite map implementation is available here:
https://bitbucket.org/atlassian/atlassian-util-concurrent/wiki/CopyOnWrite%20Maps
They are released with an Apache 2.0 license.
> Add a CopyOnWrite implementation of Map
> ---------------------------------------
>
> Key: COLLECTIONS-520
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-520
> Project: Commons Collections
> Issue Type: New Feature
> Components: Map
> Affects Versions: 4.0
> Reporter: Daniel Feist
> Fix For: 4.x
>
>
> Java provides implementations for List's and Set's but Map is missing.
> Jersey uses an implementation
> ([com.sun.jersey.client.impl.CopyOnWriteHashMap|https://java.net/projects/jersey/sources/svn/content/trunk/jersey/jersey-client/src/main/java/com/sun/jersey/client/impl/CopyOnWriteHashMap.java])
> but it doesn't fully implement Map because entrySet/keySet/values are not
> mutable.
> I implemented a CaseInsensitiveCopyOnWriteMap in Mule and while it serves our
> purposes it's not 100% complete and isn't thread-safe, and it would be good
> to see an implementation in commons. (BTW: I plan to extend from
> AsbtractHashedMap once we moved to 4.0/4.1).
> See:
> [org.mule.util.CopyOnWriteCaseInsensitiveMap|https://github.com/mulesoft/mule/blob/716893e6231be47dccd3cfba9619762e146b4b84/core/src/main/java/org/mule/util/CopyOnWriteCaseInsensitiveMap.java]
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