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From "Oleg Kalnichevski (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HTTPCORE-246) ThrottlingHttpClientHandler triggers EventListener.connectionClosed twice
Date Fri, 10 Dec 2010 11:40:02 GMT

     [ https://issues.apache.org/jira/browse/HTTPCORE-246?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Oleg Kalnichevski resolved HTTPCORE-246.

       Resolution: Fixed
    Fix Version/s: 4.1.1


I fixed the bug in SVN trunk. Please review.

Actually EventListener was never intended for anything other than injecting basic HTTP connection
lifecycle logging as HttpCore does not use any logging toolkit internally. One ought to have
all protocol specific logic in the HttpRequestExecutionHandler implementation. HttpRequestExecutionHandler#finalizeContext
is a better place for handling on connection close events than EventListener.


> ThrottlingHttpClientHandler triggers EventListener.connectionClosed twice
> -------------------------------------------------------------------------
>                 Key: HTTPCORE-246
>                 URL: https://issues.apache.org/jira/browse/HTTPCORE-246
>             Project: HttpComponents HttpCore
>          Issue Type: Bug
>          Components: HttpCore NIO
>    Affects Versions: 4.1
>         Environment: Linux 2.6.32-26-generic #47-Ubuntu
>            Reporter: Bryan Pon
>            Priority: Minor
>             Fix For: 4.1.1
> In ThrottlingHttpClientHandler.closed(NHttpClientConnection), connectionClosed() is called
twice on the event listener:
>         if (this.eventListener != null) {
>             this.eventListener.connectionClosed(conn);
>         }
>         this.execHandler.finalizeContext(context);
>         if (this.eventListener != null) {
>             this.eventListener.connectionClosed(conn);
>         }
> I'm not sure if this is intentional (looks unlikely), but I have a use case where this
causes problems.  I want to start a new connection whenever one is closed, so in the EventListener.connectionClosed()
method I am invoking ConnectingIOReactor.connect().  Since connectionClosed() is triggered
twice, this is opening two new connections.  I can work around the issue by checking if connectionClosed()
has already been called.

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