[jboss-dev-forums] [Design of Messaging on JBoss (Messaging/JBoss)] - Re: Incorporating Remoting http transport into Messaging

Thu Nov 23 00:28:49 EST 2006

I have merged Ron's HTTP branch into the trunk (http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossMessagingMergingActivity). All functional tests were passing on the branch, prior to merging. The smoke tests (including the http test) were also passing. The branch should be considered dead, no changes must be applied to it. I will delete it soon.

After the merge, the trunk uses a new Remoting version (2.2.0.Alpha4), and the Remoting Callback API to send messages from server to client.

The latest trunk version uses asynchronous push callbacks (and polling under the hood for HTTP).  The pre-merge trunk relied on synchronous calls to send messages from server to client and expected synchronous delivery confirmation (not to be mistaken with client acknowledgment). Such a behavior cannot be expected from asynchronous callbacks, so I modified MessageCallbackHandler to asynchronously send delivery confirmations back to server, and the ServerConsumerEndpoint to manage those delivery confirmations sent by the client.

One case in which delivery confirmation management is necessary is when the consumer is closed. The ServerConsumerEndpoint cannot be closed if there are messages in transit from server to client, and the delivery confirmation count mechanism is used to confirm that there are no in-flight messages.

New configuration parameters for HTTP

The polling period (in ms) can be configured, in this order:

1. By setting "jboss.messaging.callback.pollPeriod" system property on the client. This overrides any other configuration.
2. By specifying it as value of the "callbackPollPeriod" attribute, in the HTTP Connector configuration on the server (remoting-service.xml).
3. By relying on the hardcoded JMSRemotingConnection.CALLBACK_POLL_PERIOD_DEFAULT value (100 ms), if no value is explicitly specified.

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