[jboss-jira] [JBoss JIRA] Closed: (JBRULES-313) Add halt/run commands

[Edson Tirelli (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBRULES-313?page=all ]

Edson Tirelli closed JBRULES-313.
---------------------------------

    Resolution: Done

Halt command is implemented.

Just call from a rule consequence:

drools.halt();

Or from your application:

workingMemory.halt();

It will finish the execution of the current rule (in case it is executing one) and stop firing. To restart firing, just call fireAllRules() again.

Test case here:

http://anonsvn.labs.jboss.com/labs/jbossrules/trunk/drools-compiler/src/test/resources/org/drools/integrationtests/test_halt.drl

> Add halt/run commands
> ---------------------
>
>                 Key: JBRULES-313
>                 URL: http://jira.jboss.com/jira/browse/JBRULES-313
>             Project: JBoss Rules
>          Issue Type: Feature Request
>      Security Level: Public(Everyone can see) 
>         Environment: any
>            Reporter: Jacek Jarmulak
>         Assigned To: Edson Tirelli
>             Fix For:  4.0.0.MR4
>
>
> I have made a small modification to WorkingMemory and AbstractWorkingMemory that allows me to pause and the restart rule firing.
> The change consists of adding a boolean isPaused flag (plus gettter and setter methods) which is then inspected in the  while loop of the fireAllRules method as follows
>     public synchronized void fireAllRules(final AgendaFilter agendaFilter) throws FactException {
>         if ( !this.firing ) {
>             try {
>                 this.firing = true;
>                 while ( !this.isPaused() && this.agenda.fireNextItem( agendaFilter ) ) { 
>                     ;
>                 }
>             } finally {
>                 this.firing = false;
>             }
>         }
>     }
> What is this good for? 
> It lets me stop rule firing from within some rule, e.g. when I want to execute an external call.
> The rule sets up the call and then calls setPaused(true) on WorkingMemory.
> Once fireAllRules exits, an external process executes the call, possibly asserting some facts into WorkingMemory
> and then calls setPaused(false) and calls fireAllRules again.
> Why not execute the call directly from the rule?
> Because in my application the execution might take long time, and I want to have an option to move the WorkingMemory out of RAM,
> possibly moving it to another app server to continue firing after the externall call processing has completed.

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