[jboss-user] [Remoting] - Re: JBREM-877: New Socket Connection is being Created for Ev

[ron.sigal@jboss.com]

Hi Dave,

"ImmortAlex" wrote : 
  | I think, you forgot isParam="true".
  | 

Alex is right.  "invokerDestructionDelay" affects the creation of invokers on the client side, and setting "isParam" to "true" causes the "invokerDestructionDelay" parameter to be included in the InvokerLocator, which means it can be seen by the client.

I should tell you, though, that the use of "invokerDestructionDelay" may not help you when you're using the http transport.  See the thread "Socket keep alive with client EJB and RMI over HTTP" (http://www.jboss.org/index.html?module=bb&op=viewtopic&t=137758&postdays=0&postorder=asc&start=0) in this forum.  Unfortunately, I don't have any good answers right now.

"Dave Schneider" wrote : 
  | What also has me confused is that I've already upped the callbackPollPeriod attribute from its default of 102 (ms) to 5003, so I would be expecting connections from the clients only every 5 seconds or so. 
  | 

You're using an old version of JBossMessaging which, prior to versions  	 1.4.1.GA,  1.4.0.SP3.CP04, and 1.4.2.GA, didn't know about blocking/nonblocking mode, so you're seeing the default, nonblocking, behavior.  I'm not sure why increasing "callbackPollPeriod" didn't have an effect, but you probably don't want to be using nonblocking mode anyway, and "callbackPollPeriod" is ignored in blocking mode.  For that reason, I would suggest upgrading JBM.

Until recently it was necessary for the client code (JBM in this case) to specify the blocking mode when calling org.jboss.remoting.Client.addListener(), but JBREM-1084 "Allow CallbackPoller to access Client and InvokerLocator parameters" will allow org.jboss.remoting.callback.CallbackPoller to get the blocking mode directly from the InvokerLocator if you add the parameter "useAllParams" to the InvokerLocator with the value set to "true"; i.e., add


  | <attribute name="useAllParams" isParam="true">true</attribute>
  | 

to remoting-http-service.xml.  That feature doesn't exist in a released version of Remoting yet, but, if you're interested, I could attach a preview jboss-remoting.jar to JBREM-1084.

By the way, here's remoting-http-service.xml from JBossMessaging 1.4.0.SP3_CP07:


  | <?xml version="1.0" encoding="UTF-8"?>
  | 
  | <!--
  |      HTTP-based Remoting service deployment descriptor.
  | 
  |      $Id: remoting-http-service.xml 3222 2007-10-20 12:13:57Z timfox $
  |  -->
  | 
  | <server>
  | 
  |    <mbean code="org.jboss.remoting.transport.Connector"
  |           name="jboss.messaging:service=Connector,transport=http"
  |           display-name="HTTP Transport Connector">
  |       <attribute name="Configuration">
  |          <config>
  |             <invoker transport="http">
  |                <!-- There should be no reason to change these parameters - warning!
  |                     Changing them may stop JBoss Messaging working correctly -->
  |                <attribute name="marshaller" isParam="true">org.jboss.jms.wireformat.JMSWireFormat</attribute>
  |                <attribute name="unmarshaller" isParam="true">org.jboss.jms.wireformat.JMSWireFormat</attribute>               
  |                <attribute name="dataType" isParam="true">jms</attribute>
  |                <attribute name="serverBindAddress">${jboss.bind.address}</attribute>
  |                <attribute name="serverBindPort">4458</attribute>               
  |                <attribute name="callbackStore">org.jboss.remoting.callback.BlockingCallbackStore</attribute>    
  |                <!-- End immutable parameters -->
  |                                          
  |                <!-- The period of sending pings to the server -->
  |                <attribute name="clientLeasePeriod" isParam="true">10000</attribute>
  |                       
  |                <!-- Set this to true if you want the HTTP transport to block waiting for server->client traffic.
  |                Or false if you want it to poll for new traffic periodically. Recommended is true -->                       
  |                <attribute name="blockingMode" isParam="true">blocking</attribute>
  |                
  |                <!-- Timeout for blocking. Only has relevance if blockingMode = true -->
  |                <attribute name="blockingTimeout" isParam="true">30000</attribute>
  |                 
  |                <!-- The periodicity of polling. Only has relevance if blockingMode = false -->               
  |                <attribute name="callbackPollPeriod" isParam="true">10000</attribute>  
  |             </invoker>
  |             <handlers>
  |                <handler subsystem="JMS">org.jboss.jms.server.remoting.JMSServerInvocationHandler</handler>
  |             </handlers>
  |          </config>
  |       </attribute>
  |    </mbean>
  | 
  | </server>
  | 

Using blocking mode should reduce the number of invocations, and therefore reduce the number of open sockets.

-Ron

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