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https://issues.apache.org/jira/browse/WW-4874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16406366#comment-16406366
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ASF subversion and git services commented on WW-4874:
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Commit fb8f139b069dd32ccecf9abe6b4c110a666ca860 in struts's branch
refs/heads/master from [~yasser.zamani]
[ https://gitbox.apache.org/repos/asf?p=struts.git;h=fb8f139 ]
WW-4874 Renames local variable inv to invocation
> Asynchronous action method
> --------------------------
>
> Key: WW-4874
> URL: https://issues.apache.org/jira/browse/WW-4874
> Project: Struts 2
> Issue Type: New Feature
> Components: Core Actions, Dispatch Filter
> Reporter: Yasser Zamani
> Priority: Major
> Labels: action, asynchronous
> Fix For: 2.6
>
> Original Estimate: 1,344h
> Remaining Estimate: 1,344h
>
> User will be able to return {{java.util.concurrent.Callable<String>}} in
> their actions. Struts when sees such result, runs {{resultCode =
> result.call();}} in it's own managed thread pool but exits from servlet's
> main thread with a null result, i.e. gives back main thread to container and
> leaves response open for concurrent processing. When {{resultCode =
> result.call();}} returned, Struts calls
> {{javax.servlet.AsyncContext.dispatch()}} and {{resumes request processing}}
> within a container's thread servlet to generate the appropriate result for
> user according to {{resultCode}}.
> This adds better support for SLS (Short request processing, Long action
> execution, Short response processing) via Servlet 3's Async API.
> Support of other cases like SSL (e.g. a download server) or LLL(e.g. a video
> converter server) is still open.
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