com.groiss.event
Class EventHandler

java.lang.Object
  com.groiss.event.EventHandler

All Implemented Interfaces:

IEventHandler

Direct Known Subclasses:

ExceptionHandlingCompletedHandler

public class EventHandler
extends java.lang.Object
implements IEventHandler

The base class for an event handler.

Constructor Summary

EventHandler()

Method Summary

boolean	handle(Event e, ProcessInstance handlerProc, EventRegistry reg) The handle method is called when an event is raised and a handler has been registered.
boolean	onRegister(ProcessInstance handlerProc) This method is called when you register this handler.
void	onUnregister(EventRegistry reg) This method is called when the handler is unregistered.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EventHandler

public EventHandler()

Method Detail

handle

public boolean handle(Event e,
                      ProcessInstance handlerProc,
                      EventRegistry reg)

The handle method is called when an event is raised and a handler has been registered. This method only writes a message to the log (log level >= 2) and returns true. The return value is used only in "sync" event handlers, where returning true immediatly finishs the activity and ungegisters the handler.

Specified by:

handle in interface IEventHandler

Parameters:

e - the raised event

handlerProc - the process instance which has registered for the event.

reg - the event registry entry

Returns:

this implementation returns true

onRegister

public boolean onRegister(ProcessInstance handlerProc)

This method is called when you register this handler. It does nothing. If the method returns false, the event is not registered. In sync event handlers returning false finishes the step.

Specified by:

onRegister in interface IEventHandler

Parameters:

handlerProc - the process instance which is registring

Returns:

This implementation returns true.

onUnregister

public void onUnregister(EventRegistry reg)

Description copied from interface: IEventHandler

This method is called when the handler is unregistered.

Specified by:

onUnregister in interface IEventHandler