org.mule.transport.polling.watermark
Class UpdateExpressionWatermark

java.lang.Object
  org.mule.transport.polling.MessageProcessorPollingOverride
      org.mule.transport.polling.watermark.Watermark
          org.mule.transport.polling.watermark.UpdateExpressionWatermark

All Implemented Interfaces:

MuleContextAware, Initialisable

public class UpdateExpressionWatermark
extends Watermark
implements Initialisable, MuleContextAware

Implementation of Watermark in which the value is updated through a MEL expression

Field Summary

Fields inherited from class org.mule.transport.polling.watermark.Watermark

annotations

Fields inherited from interface org.mule.api.lifecycle.Initialisable

PHASE_NAME

Constructor Summary

UpdateExpressionWatermark(ObjectStore<Serializable> objectStore, String variable, String defaultExpression, String updateExpression)

Method Summary

protected Object	getUpdatedValue(MuleEvent event) Returns the new watermark value by evaluating updateExpression on the flowVar of the given name
void	initialise() Method used to perform any initialisation work.
MessageProcessorPollingInterceptor	interceptor() Returns an interceptor instance.
void	setMuleContext(MuleContext muleContext)

Methods inherited from class org.mule.transport.polling.watermark.Watermark

putInto, resolveVariable, updateFrom, updateWith

Methods inherited from class java.lang.Object

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

Constructor Detail

UpdateExpressionWatermark

public UpdateExpressionWatermark(ObjectStore<Serializable> objectStore,
                                 String variable,
                                 String defaultExpression,
                                 String updateExpression)

Method Detail

initialise

public void initialise()
                throws InitialisationException

Description copied from interface: Initialisable

Method used to perform any initialisation work. If a fatal error occurs during initialisation an InitialisationException should be thrown, causing the Mule instance to shutdown. If the error is recoverable, say by retrying to connect, a RecoverableException should be thrown. There is no guarantee that by throwing a Recoverable exception that the Mule instance will not shut down.

Specified by:

initialise in interface Initialisable

Throws:

InitialisationException - if a fatal error occurs causing the Mule instance to shutdown

RecoverableException - if an error occurs that can be recovered from

getUpdatedValue

protected Object getUpdatedValue(MuleEvent event)

Returns the new watermark value by evaluating updateExpression on the flowVar of the given name

Specified by:

getUpdatedValue in class Watermark

Parameters:

event - the @{link MuleEvent in which the watermark is being evaluated

Returns:

a Serializable value

interceptor

public MessageProcessorPollingInterceptor interceptor()

Description copied from class: MessageProcessorPollingOverride

Returns an interceptor instance. This method will be called on every poll, and may return a new instance every time or always the same instance (the latter case requires the instance to be threadsafe). Interceptor's are scoped for each poll and flow execution and will be discarded after the scope ends.

Specified by:

interceptor in class MessageProcessorPollingOverride

Returns:

a new interceptor instance that cn be used to alter the functionality of a message processor polling component

setMuleContext

public void setMuleContext(MuleContext muleContext)

Specified by:

setMuleContext in interface MuleContextAware