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From "Yasser Zamani (JIRA)" <j...@apache.org>
Subject [jira] [Created] (WW-4874) Asynchronous action method
Date Thu, 19 Oct 2017 12:33:00 GMT
Yasser Zamani created WW-4874:
---------------------------------

             Summary: 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
             Fix For: 2.5.x


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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