5 Replies Latest reply on Apr 23, 2010 6:22 AM by Edward Pilipczuk

    My Action gets constructed twice

    Quinton Anderson Newbie

      Hi,

       

      I am running ESB 4.7 inside JBoss AS 5.1. In our production system there is a strange effect where each of the actions configured in the ESB as constructed twice. Obviously this creates quite a few downstream issues with duplicate resources.

       

      Can anyone think of any reason why the ESB would be creating two instances of each of my action classes?

       

      Thanks!

        • 1. Re: My Action gets constructed twice
          Tom Fennelly Master

          My guess would be that the actions are actually configured twice in the system somewhere e.g. you have something deployed that shouldn't and it contains a config of these actions too.

           

          Things to try:

          1. Check your system and make sure you don't have additional .esbs or services deployed, that shouldn't be.
          2. I think the monitoring tools would give you a visual of your running system... what deployments are there... what services are on those deployments... what actions are on the services etc.
          • 2. Re: My Action gets constructed twice
            Quinton Anderson Newbie

            Hi Tom,

             

            Thanks for the prompt response. Much appreciated.

             

            I have verified that there are no extra esbs deployed. I have performed the same test with smaller sandbox applications (some I created for ESB articles I have posted to the forums) and they all behave correctly. It only happens with my production system. So the problem must lie between the keyboard and the chair, but I can't seem to figure out what I am doing wrong.

             

            Here is my esb definition:

             

             

            <?xml version="1.0"?>
            <jbossesb parameterReloadSecs="5000"
                 xmlns="http://anonsvn.labs.jboss.com/labs/jbossesb/trunk/product/etc/schemas/xml/jbossesb-1.0.1.xsd"
                 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                 xsi:schemaLocation="http://anonsvn.labs.jboss.com/labs/jbossesb/trunk/product/etc/schemas/xml/jbossesb-1.0.1.xsd http://anonsvn.labs.jboss.com/labs/jbossesb/trunk/product/etc/schemas/xml/jbossesb-1.0.1.xsd">
                 <providers>
                      <schedule-provider name="scheduler">
                           <property name="org.quartz.scheduler.wrapJobExecutionInUserTransaction" value="false"/>
                           <simple-schedule scheduleid="rlog-trigger" frequency="60"/>
                      </schedule-provider>
                      
                 </providers>
                 <services>
                      <service category="RlogActions" description="Extracts messages from DB" invmScope="GLOBAL" invmTransacted="false" name="ExtractorActions">
                           <property name="maxThreads" value="1" />
                           <listeners>
                                <scheduled-listener name="rlog-extractor-listener"
                                     scheduleidref="rlog-trigger"
                                     event-processor="za.co.fnb.corp.cit.cash.rlog2sbsvr.actions.RlogScheduler" />
                           </listeners>
                           <actions mep="OneWay">
                                <action class="za.co.fnb.corp.cit.cash.rlog2sbsvr.actions.RlogExtractorAction" name="RlogExtractAction" process="process">
                                     <property name="skipFirst" value="2"/>
                                </action>
                           </actions>
                      </service>
                      
                      <service category="RlogActions" description="Processes RLog messages in the message store"
                           invmScope="GLOBAL" invmTransacted="false" name="ProcessorAction">
                           <property name="maxThreads" value="1" />
                           <listeners>
                                <scheduled-listener name="rlog-processor-listener"
                                     scheduleidref="rlog-trigger"
                                     event-processor="za.co.fnb.corp.cit.cash.rlog2sbsvr.actions.RlogScheduler" />
                           </listeners>
                           <actions mep="OneWay">
                                <action class="za.co.fnb.corp.cit.cash.rlog2sbsvr.actions.RlogProcessorAction" name="RlogProcessAction" process="process">
                                     <property name="skipFirst" value="2"/>
                                     <property name="maxProcessCalls" value="100"/>
                                </action>
                           </actions>
                      </service> 
                 </services>
            </jbossesb>
            
            

             

             

            The admin console confirms this:

            Untitled.jpg

             

            Anything else I could be doing wrong that you know of?

            • 3. Re: My Action gets constructed twice
              Tom Fennelly Master

              So in the case you identified there, 2 instances of the RlogProcessorAction will be in existance for each of those services because each service has 2 message aware listeners (invm and scheduled) i.e. an action pipeline instance is created for each message aware listener, with 1 instance of each action on each pipeline.

               

              What are you expecting to see?  How are you verifying that multiple instances are being created?

              • 4. Re: My Action gets constructed twice
                Quinton Anderson Newbie

                I was under the impression that a single instance of the pipeline existed regardless of how many listeners there were. I thought the action was basically a singleton.

                 

                It was verified by simply logging the number of calls into the constructor of each action.

                 

                Ok, so that was a lack of understanding on my side, thanks.

                • 5. Re: My Action gets constructed twice
                  Edward Pilipczuk Newbie

                  Hello,

                  my observation of the number of action instances is that for the each instance of the listener (thread) there is an allocation of separate action pipeline.

                  The action is not a singleton - it does not serve the execution context for the each listener thread.

                  Edward