sk.baka.webvm.misc
Class BackgroundService

java.lang.Object
  sk.baka.webvm.misc.BackgroundService

Direct Known Subclasses:

HistorySampler, NotificationDelivery

public abstract class BackgroundService
extends Object

Executes various tasks in background thread.

Author:

Martin Vysny

Field Summary

protected int	maxThreads Maximum thread pool size.
protected String	name A short name of the service - used in thread names.

Constructor Summary

protected

BackgroundService(String name, int maxThreads) Creates new service instance.

Method Summary

protected ScheduledExecutorService	getExecutor() Returns the executor.
static ThreadFactory	newDaemonFactory(String name) Creates a new factory which creates daemon threads using the Executors.defaultThreadFactory().
void	start() Starts the sampling process in a background thread.
protected abstract void	started(ScheduledExecutorService executor) Invoked when the service is started.
void	stop() Disposes of this sampler.
protected abstract void	stopped() Invoked after the service has been stopped.

Methods inherited from class java.lang.Object

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

Field Detail

name

protected final String name

A short name of the service - used in thread names.

maxThreads

protected final int maxThreads

Maximum thread pool size.

Constructor Detail

BackgroundService

protected BackgroundService(String name,
                            int maxThreads)

Creates new service instance.

Parameters:

name - A short name of the service - used in thread names.

maxThreads - Maximum thread pool size.

Method Detail

start

public void start()

Starts the sampling process in a background thread.

started

protected abstract void started(ScheduledExecutorService executor)

Invoked when the service is started.

Parameters:

executor - executes tasks.

getExecutor

protected final ScheduledExecutorService getExecutor()

Returns the executor.

Returns:

the executor. null if not started.

stop

public final void stop()

Disposes of this sampler. This instance is no longer usable and cannot be started again.

stopped

protected abstract void stopped()

Invoked after the service has been stopped.

newDaemonFactory

public static ThreadFactory newDaemonFactory(String name)

Creates a new factory which creates daemon threads using the Executors.defaultThreadFactory().

Parameters:

name - create threads marked with this name.

Returns:

a daemon thread factory.