[jira] Issue Comment Edited: (HTTPCLIENT-854) RFE: Provide mechanism to allow request transmission and response reception to be performed independently

["Mike Cumings (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12721633#action_12721633 ] 

Mike Cumings edited comment on HTTPCLIENT-854 at 6/18/09 8:29 PM:
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The difference is that the request is not flushed to the server before the arbitrary work is performed.  The execute() method performs *both* the request transmission and the response processing.  Thus, there is no way to flush the request without blocking to wait for the response.

I should elaborate a bit more, perhaps.  It is technically possible to do what you suggest.  However, doing so would mean that I would employ N (dynamically allocated) threads for N requests (plus the originalting thread), whereas the asynchronous code I've added allows for efficient processing using just 1 thread (plus the originating thread).  In my use case, the requests for all outstanding connections must be flushed immediately.  The responses must be processed in the order in which the connections are made.  This is important for my application.

      was (Author: mcumings):
    The difference is that the request is not flushed to the server before the arbitrary work is performed.  The execute() methos performs *both* the request transmission and the response processing.  Thus, there is no way to flush the request without blocking to wait for the response.
  
> RFE: Provide mechanism to allow request transmission and response reception to be performed independently
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HTTPCLIENT-854
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-854
>             Project: HttpComponents HttpClient
>          Issue Type: Improvement
>          Components: HttpClient
>    Affects Versions: 4.0 Final
>         Environment: All
>            Reporter: Mike Cumings
>            Priority: Minor
>             Fix For: Future
>
>         Attachments: HTTPCLIENT-854_httpclient_2009-06-18_1.patch, HTTPCLIENT-854_httpcore_2009-06-18_1.patch
>
>
> The HttpClient API currently provides for the execution of a request via the HttpClient.execute(...) methods.  These methods all send the request and then block until the response has been received.  This precludes the user of the API from being able to send the request, perform some additional work, then come back and block on the request.  This style of processing is very desirable for implementation of HTTP-based protocols such as Bidirectional-streams Over Synchronous HTTP (BOSH).   This capability is also closely related to HTTPCLIENT-258, support for HTTP 1.1 pipelining.
> The current code base (4.0) currently utilizes org.apache.http.impl.client.DefaultRequestDirector.execute(...) to transmit requests.  This method contains a retry loop which blocks on and then examines the response from the remote server.  When success is detected, it cleans up and returns the response instance.  Requests are sent using an HttpResponseExecutor instance.  These classes support the ability to separately doSendRequest()  and doReceiveResponse().
> Please expose the ability to leverage this functionality outwith the retry loop but including the existing routing and authorization capabilities, where possible.

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