dk.netarkivet.harvester.distribute
Class HarvesterMessageHandler

java.lang.Object
  dk.netarkivet.harvester.distribute.HarvesterMessageHandler

All Implemented Interfaces:

HarvesterMessageVisitor, javax.jms.MessageListener

Direct Known Subclasses:

HarvestControllerServer, HarvestDispatcher, HarvestMonitor, HarvestSchedulerMonitorServer

public abstract class HarvesterMessageHandler
extends java.lang.Object
implements HarvesterMessageVisitor, javax.jms.MessageListener

This default message handler shields of all unimplemented methods from the HarvesterMessageVisitor interface. Classes should not implement HarvesterMessageVisitor but extend this class.

See Also:

HarvesterMessageVisitor

Constructor Summary

HarvesterMessageHandler()
Creates a HarvesterMessageHandler object.

Method Summary

void	onMessage(javax.jms.Message msg) Unpacks and calls accept() on the message object.
void	visit(CrawlProgressMessage msg) This method should be overridden and implemented by a sub class if message handling is wanted.
void	visit(CrawlStatusMessage msg) This method should be overridden and implemented by a sub class if message handling is wanted.
void	visit(DoOneCrawlMessage msg) This method should be overridden and implemented by a sub class if message handling is wanted.
void	visit(FrontierReportMessage msg) This method should be overridden and implemented by a sub class if message handling is wanted.
void	visit(HarvesterStatusMessage msg) This method should be overridden and implemented by a sub class if message handling is wanted.
void	visit(IndexReadyMessage msg) This method should be overridden and implemented by a sub class if message handling is wanted.
void	visit(JobEndedMessage msg) This method should be overridden and implemented by a sub class if message handling is wanted.

Methods inherited from class java.lang.Object

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

Constructor Detail

HarvesterMessageHandler

public HarvesterMessageHandler()

Creates a HarvesterMessageHandler object.

Method Detail

onMessage

public void onMessage(javax.jms.Message msg)

Unpacks and calls accept() on the message object. This method catches all exceptions and logs them.

Specified by:

onMessage in interface javax.jms.MessageListener

Parameters:

msg - an ObjectMessage

visit

public void visit(CrawlStatusMessage msg)
           throws PermissionDenied

This method should be overridden and implemented by a sub class if message handling is wanted.

Specified by:

visit in interface HarvesterMessageVisitor

Parameters:

msg - a CrawlStatusMessage

Throws:

PermissionDenied - when invoked

visit

public void visit(DoOneCrawlMessage msg)
           throws PermissionDenied

This method should be overridden and implemented by a sub class if message handling is wanted.

Specified by:

visit in interface HarvesterMessageVisitor

Parameters:

msg - a DoOneCrawlMessage

Throws:

PermissionDenied - when invoked

visit

public void visit(CrawlProgressMessage msg)

This method should be overridden and implemented by a sub class if message handling is wanted.

Specified by:

visit in interface HarvesterMessageVisitor

Parameters:

msg - a CrawlProgressMessage

Throws:

PermissionDenied - when invoked

visit

public void visit(FrontierReportMessage msg)

This method should be overridden and implemented by a sub class if message handling is wanted.

Specified by:

visit in interface HarvesterMessageVisitor

Parameters:

msg - a FrontierReportMessage

Throws:

PermissionDenied - when invoked

visit

public void visit(JobEndedMessage msg)

This method should be overridden and implemented by a sub class if message handling is wanted.

Specified by:

visit in interface HarvesterMessageVisitor

Parameters:

msg - a JobEndedMessage

Throws:

PermissionDenied - when invoked

visit

public void visit(HarvesterStatusMessage msg)

This method should be overridden and implemented by a sub class if message handling is wanted.

Specified by:

visit in interface HarvesterMessageVisitor

Parameters:

msg - a HarvesterStatusMessage

Throws:

PermissionDenied - when invoked

visit

public void visit(IndexReadyMessage msg)

This method should be overridden and implemented by a sub class if message handling is wanted.

Specified by:

visit in interface HarvesterMessageVisitor

Parameters:

msg - a IndexReadyMessage

Throws:

PermissionDenied - when invoked