org.mule.transport.polling.watermark.selector

Class SelectorWatermark

java.lang.Object

org.mule.transport.polling.MessageProcessorPollingOverride

org.mule.transport.polling.watermark.Watermark

org.mule.transport.polling.watermark.selector.SelectorWatermark

All Implemented Interfaces:

MuleContextAware, Initialisable

public class SelectorWatermark
extends Watermark
implements Initialisable, MuleContextAware

Implementation of Watermark that relies on a WatermarkSelector to update its values

Since:

3.5.0

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

Constructors

Constructor and Description
SelectorWatermark(ObjectStore<Serializable> objectStore, String variable, String defaultExpression, WatermarkSelectorBroker selectorBroker, String selectorExpression)

Method Summary

Methods

Modifier and Type	Method and Description
protected Object	getUpdatedValue(MuleEvent event) Returns the selectorBroker value and resets it so that its reusable.
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

SelectorWatermark

public SelectorWatermark(ObjectStore<Serializable> objectStore,
                 String variable,
                 String defaultExpression,
                 WatermarkSelectorBroker selectorBroker,
                 String selectorExpression)

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 selectorBroker value and resets it so that its reusable. Notice that the selectorBroker is reusable without risk of concurrency issues because watermark only works on synchronous flows

Specified by:

getUpdatedValue in class Watermark

Parameters:

event - the MuleEvent that was returned by the owning flow

Returns:

the new watermark value

interceptor

public MessageProcessorPollingInterceptor interceptor()

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 SelectorWatermarkPollingInterceptor

setMuleContext

public void setMuleContext(MuleContext muleContext)

Specified by:

setMuleContext in interface MuleContextAware