[jboss-jira] [JBoss JIRA] Updated: (JBMESSAGING-1132) Use blocking mode for callbacks with Remoting http transport

[Tim Fox (JIRA)]

     [ https://jira.jboss.org/jira/browse/JBMESSAGING-1132?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Fox updated JBMESSAGING-1132:
---------------------------------

    Fix Version/s: Unscheduled
                       (was: Stable branch)


> Use blocking mode for callbacks with Remoting http transport
> ------------------------------------------------------------
>
>                 Key: JBMESSAGING-1132
>                 URL: https://jira.jboss.org/jira/browse/JBMESSAGING-1132
>             Project: JBoss Messaging
>          Issue Type: Task
>            Reporter: Ron Sigal
>            Assignee: Tim Fox
>            Priority: Minor
>             Fix For: Unscheduled
>
>
> In response to JBREM-641 "re-implement the callback polling for http transport to reduce latency", an alternative way of handling callbacks was introduced in Remoting.  In particular, instead of the client periodically polling for callbacks, in "blocking" mode, the request to download callbacks blocks on the server until either (1) a callback is available, or (2) the timeout period has expired.  The advantage is reduced latency in retrieving callbacks.  In fact, some JBM http transport stress tests which fail in "nonblocking" mode now pass in "blocking" mode.
> 1. The default mode is "nonblocking", so it is necessary to explicitly configure "blocking" mode.  One way to do so is to add the appropriate parameter to the metadata map when installing the callback listener.  E.g., add the following line to org.jboss.jms.client.remoting.JMSRemotingConnection.createCallbackMetadata():
>          if (reportPollingStatistics != null)
>          {
>             metadata.put(CallbackPoller.REPORT_STATISTICS, reportPollingStatistics);
>          }
>          metadata.put(ServerInvoker.BLOCKING_MODE, ServerInvoker.BLOCKING);  //  <<=== add this line
>          metadata.put(ServerInvoker.BLOCKING_TIMEOUT, "7777");                              // optional: default is 5000 milliseconds
> 2. The line
>    <attribute name="callbackPollPeriod" isParam="true">102</attribute>
> may be removed from remoting-http-service.xml, since it's no longer relevant.

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