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Date: Tue, 12 Dec 2017 14:42:00 +0000 (UTC)
From: "Lukasz Lenart (JIRA)" <jira@apache.org>
To: issues@struts.apache.org
Message-ID: <JIRA.13110655.1508416322000.439573.1513089720283@Atlassian.JIRA>
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Subject: [jira] [Commented] (WW-4874) Asynchronous action method
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archived-at: Tue, 12 Dec 2017 14:42:06 -0000


    [ https://issues.apache.org/jira/browse/WW-4874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16287695#comment-16287695 ] 

Lukasz Lenart commented on WW-4874:
-----------------------------------

I would wait till 2.6 - this change can impact users. I have created 2.5.15 just to cover the latest discovered issues but it should be a small release (in case of number of fixed issues). We can work on both releases the same time - we can create a branch off of the latest 2.5.14.1 tag.

> 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
>              Labels: action, asynchronous
>             Fix For: 2.5.x
>
>   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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