Package org.elasticsearch.common.util.concurrent

Class AbstractAsyncTask

java.lang.Object

org.elasticsearch.common.util.concurrent.AbstractAsyncTask

All Implemented Interfaces:

Closeable, AutoCloseable, Runnable

public abstract class AbstractAsyncTask
extends Object
implements Runnable, Closeable

A base class for tasks that need to repeat.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractAsyncTask(org.apache.logging.log4j.Logger logger, ThreadPool threadPool, TimeValue interval, boolean autoReschedule)

Method Summary

Modifier and Type	Method	Description
void	cancel()	Cancel any scheduled run, but do not prevent subsequent restarts.
void	close()	Cancel any scheduled run
TimeValue	getInterval()
protected String	getThreadPool()	Use the same threadpool by default.
boolean	isClosed()
boolean	isScheduled()
protected abstract boolean	mustReschedule()	Test any external conditions that determine whether the task should be scheduled.
void	rescheduleIfNecessary()	Schedule the task to run after the configured interval if it is not closed and any further conditions imposed by derived classes are met.
void	run()
protected abstract void	runInternal()
void	setInterval(TimeValue interval)	Change the interval between runs.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractAsyncTask

protected AbstractAsyncTask(org.apache.logging.log4j.Logger logger,
                            ThreadPool threadPool,
                            TimeValue interval,
                            boolean autoReschedule)

Method Detail

setInterval

public void setInterval(TimeValue interval)

Change the interval between runs. If a future run is scheduled then this will reschedule it.

Parameters:

interval - The new interval between runs.

getInterval

public TimeValue getInterval()

mustReschedule

protected abstract boolean mustReschedule()

Test any external conditions that determine whether the task should be scheduled. This method does *not* need to test if the task is closed, as being closed automatically prevents scheduling.

Returns:

Should the task be scheduled to run?

rescheduleIfNecessary

public void rescheduleIfNecessary()

Schedule the task to run after the configured interval if it is not closed and any further conditions imposed by derived classes are met. Any previously scheduled invocation is cancelled.

isScheduled

public boolean isScheduled()

cancel

public void cancel()

Cancel any scheduled run, but do not prevent subsequent restarts.

close

public void close()

Cancel any scheduled run

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

isClosed

public boolean isClosed()

run

public final void run()

Specified by:

run in interface Runnable

runInternal

protected abstract void runInternal()

getThreadPool

protected String getThreadPool()

Use the same threadpool by default. Derived classes can change this if required.