com.haley.haleyrules
Interface ExecutionListener

All Superinterfaces:

java.util.EventListener

public interface ExecutionListener

extends java.util.EventListener

The ExecutionListener interface allows an object to receive a message from Eclipse immediately before a rule is executed. An implementation of ExecutionListener can be added to a KnowledgeBase to receive these messages, see
The following code demonstrates the use of an ExecutionListener.

 class MyExecutionListener implements ExecutionListener {
   KnowledgeBase kb;
   MyExecutionListener(KnowledgeBase kb) {
	this.kb=kb;
    // constructor

    public void onExecutionActivation(WorkingMemory wm, Activation activation) {
	Rule rule = null;
	try {
	    rule = activation.getRule();
          System.err.println("Rule " + rule.getName() +
                             " fired, with label " + rule.getLabel() +
                             ", id = " + rule.getId() +
                             ", salience = " + rule.getSalience());
	} catch (EclipseException ee) {
	    ee.printStackTrace();
	    return;
	} finally {
	    rule.release();
	}
   }
} // class MyExecutionListener

Then, your initialization code can use the listener as follows:

     kb.setExecutionListener(new MyExecutionListener(kb));
 

Author:

The Haley Enterprise Copyright © 1998-2004, all rights reserved. Questions, comments or to report a problem contact support@haley.com

See Also:

KnowledgeBaseFactory.newKnowledgeBase(boolean, ErrorListener,Object), KnowledgeBase.setExecutionListener(ExecutionListener)

Method Summary

void	onExecuteActivation(WorkingMemory wm, Activation activation) This method is called immediately before executing a rule.

Method Detail

onExecuteActivation

public void onExecuteActivation(WorkingMemory wm,
                                Activation activation)
                         throws EclipseException

This method is called immediately before executing a rule.

Parameters:

wm - the WorkingMemory executing this rule

activation - the address of the activation (which will not survive after the listener(s) return)

Throws:

EclipseException

See Also:

Activation.getRule()