org.apache.camel.impl
Class ScheduledPollConsumer

java.lang.Object
  org.apache.camel.impl.ServiceSupport
      org.apache.camel.impl.DefaultConsumer
          org.apache.camel.impl.ScheduledPollConsumer

All Implemented Interfaces:

Runnable, Consumer, PollingConsumerPollingStrategy, Service, ShutdownableService, SuspendableService

Direct Known Subclasses:

DefaultScheduledPollConsumer, GenericFileConsumer

public abstract class ScheduledPollConsumer
extends DefaultConsumer
implements Runnable, SuspendableService, PollingConsumerPollingStrategy

A useful base class for any consumer which is polling based

Version:

Field Summary

Fields inherited from class org.apache.camel.impl.DefaultConsumer

log

Constructor Summary

ScheduledPollConsumer(Endpoint endpoint, Processor processor)

ScheduledPollConsumer(Endpoint endpoint, Processor processor, ScheduledExecutorService executor)

Method Summary

void	afterPoll() Callback invoked after the poll.
long	beforePoll(long timeout) Callback invoked before the poll.
protected void	doStart()
protected void	doStop()
protected void	doSuspend() Implementations override this method to support customized suspend/resume.
long	getDelay()
long	getInitialDelay()
PollingConsumerPollStrategy	getPollStrategy()
LoggingLevel	getRunLoggingLevel()
TimeUnit	getTimeUnit()
protected boolean	isPollAllowed()
boolean	isStartScheduler()
boolean	isUseFixedDelay()
void	onInit() Callback invoked when the consumer is initialized such as when the PollingConsumer starts.
protected abstract int	poll() The polling method which is invoked periodically to poll this consumer
void	run() Invoked whenever we should be polled
void	setDelay(long delay)
void	setInitialDelay(long initialDelay)
void	setPollStrategy(PollingConsumerPollStrategy pollStrategy)
void	setRunLoggingLevel(LoggingLevel runLoggingLevel)
void	setStartScheduler(boolean startScheduler) Sets whether the scheduler should be started when this consumer starts.
void	setTimeUnit(TimeUnit timeUnit) Sets the time unit to use.
void	setUseFixedDelay(boolean useFixedDelay)
protected void	startScheduler()

Methods inherited from class org.apache.camel.impl.DefaultConsumer

getAsyncProcessor, getEndpoint, getExceptionHandler, getProcessor, handleException, setExceptionHandler, toString

Methods inherited from class org.apache.camel.impl.ServiceSupport

addChildService, doResume, doShutdown, getStatus, getVersion, isRunAllowed, isStarted, isStarting, isStopped, isStopping, isSuspended, isSuspending, removeChildService, resume, shutdown, start, start, stop, suspend

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.camel.SuspendableService

isSuspended, resume, suspend

Methods inherited from interface org.apache.camel.Service

start, stop

Constructor Detail

ScheduledPollConsumer

public ScheduledPollConsumer(Endpoint endpoint,
                             Processor processor)

ScheduledPollConsumer

public ScheduledPollConsumer(Endpoint endpoint,
                             Processor processor,
                             ScheduledExecutorService executor)

Method Detail

run

public void run()

Invoked whenever we should be polled

Specified by:

run in interface Runnable

isPollAllowed

protected boolean isPollAllowed()

getInitialDelay

public long getInitialDelay()

setInitialDelay

public void setInitialDelay(long initialDelay)

getDelay

public long getDelay()

setDelay

public void setDelay(long delay)

getTimeUnit

public TimeUnit getTimeUnit()

setTimeUnit

public void setTimeUnit(TimeUnit timeUnit)

Sets the time unit to use.

Notice that both getDelay() and getInitialDelay() are using the same time unit. So if you change this value, then take into account that the default value of getInitialDelay() is 1000. So you may to adjust this value accordingly.

Parameters:

timeUnit - the time unit.

isUseFixedDelay

public boolean isUseFixedDelay()

setUseFixedDelay

public void setUseFixedDelay(boolean useFixedDelay)

getRunLoggingLevel

public LoggingLevel getRunLoggingLevel()

setRunLoggingLevel

public void setRunLoggingLevel(LoggingLevel runLoggingLevel)

getPollStrategy

public PollingConsumerPollStrategy getPollStrategy()

setPollStrategy

public void setPollStrategy(PollingConsumerPollStrategy pollStrategy)

isStartScheduler

public boolean isStartScheduler()

setStartScheduler

public void setStartScheduler(boolean startScheduler)

Sets whether the scheduler should be started when this consumer starts.

This option is default true.

Parameters:

startScheduler - whether to start scheduler

poll

protected abstract int poll()
                     throws Exception

The polling method which is invoked periodically to poll this consumer

Returns:

number of messages polled, will be 0 if no message was polled at all.

Throws:

Exception - can be thrown if an exception occurred during polling

doStart

protected void doStart()
                throws Exception

Overrides:

doStart in class DefaultConsumer

Throws:

Exception

startScheduler

protected void startScheduler()

doStop

protected void doStop()
               throws Exception

Overrides:

doStop in class DefaultConsumer

Throws:

Exception

doSuspend

protected void doSuspend()
                  throws Exception

Description copied from class: ServiceSupport

Implementations override this method to support customized suspend/resume.

Overrides:

doSuspend in class ServiceSupport

Throws:

Exception

onInit

public void onInit()
            throws Exception

Description copied from interface: PollingConsumerPollingStrategy

Callback invoked when the consumer is initialized such as when the PollingConsumer starts.

Specified by:

onInit in interface PollingConsumerPollingStrategy

Throws:

Exception - can be thrown if error initializing.

beforePoll

public long beforePoll(long timeout)
                throws Exception

Description copied from interface: PollingConsumerPollingStrategy

Callback invoked before the poll.

Specified by:

beforePoll in interface PollingConsumerPollingStrategy

Parameters:

timeout - the timeout

Returns:

timeout to be used, this allows returning a higher timeout value to ensure at least one poll is being performed

Throws:

Exception - can be thrown if error occurred

afterPoll

public void afterPoll()
               throws Exception

Description copied from interface: PollingConsumerPollingStrategy

Callback invoked after the poll.

Specified by:

afterPoll in interface PollingConsumerPollingStrategy

Throws:

Exception - can be thrown if error occurred