org.deepsymmetry.beatlink

Class LifecycleParticipant

java.lang.Object

org.deepsymmetry.beatlink.LifecycleParticipant

Direct Known Subclasses:

ArtFinder, BeatFinder, BeatGridFinder, ConnectionManager, DeviceFinder, MetadataFinder, TimeFinder, VirtualCdj, WaveformFinder

public abstract class LifecycleParticipant
extends Object

Provides the abstract skeleton for all the classes that can be started and stopped in Beat Link, and for which other classes may have a need to know when they start or stop.

Constructor Summary

Constructors

Constructor and Description
LifecycleParticipant()

Method Summary

Modifier and Type	Method and Description
void	addLifecycleListener(LifecycleListener listener) Adds the specified life cycle listener to receive announcements when the component starts and stops.
protected void	deliverLifecycleAnnouncement(org.slf4j.Logger logger, boolean starting) Send a lifecycle announcement to all registered listeners.
protected void	ensureRunning() Helper method to throw an IllegalStateException if we are not currently running.
Set<LifecycleListener>	getLifecycleListeners() Get the set of lifecycle listeners that are currently registered.
abstract boolean	isRunning() Check whether this component has been started.
void	removeLifecycleListener(LifecycleListener listener) Removes the specified life cycle listener so that it no longer receives announcements when the component starts or stops.

Methods inherited from class java.lang.Object

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

Constructor Detail

LifecycleParticipant

public LifecycleParticipant()

Method Detail

addLifecycleListener

public void addLifecycleListener(LifecycleListener listener)

Adds the specified life cycle listener to receive announcements when the component starts and stops. If listener is null or already present in the list of registered listeners, no exception is thrown and no action is performed.

Lifecycle announcements are delivered to listeners on a separate thread to avoid worries about deadlock in synchronized start and stop methods. The called function should still be fast, or delegate long operations to its own separate thread.

Parameters:

listener - the device announcement listener to add

removeLifecycleListener

public void removeLifecycleListener(LifecycleListener listener)

Removes the specified life cycle listener so that it no longer receives announcements when the component starts or stops. If listener is null or not present in the list of registered listeners, no exception is thrown and no action is performed.

Parameters:

listener - the life cycle listener to remove

getLifecycleListeners

public Set<LifecycleListener> getLifecycleListeners()

Get the set of lifecycle listeners that are currently registered.

Returns:

the currently registered lifecycle listeners

deliverLifecycleAnnouncement

protected void deliverLifecycleAnnouncement(org.slf4j.Logger logger,
                                            boolean starting)

Send a lifecycle announcement to all registered listeners.

Parameters:

logger - the logger to use, so the log entry shows as belonging to the proper subclass.

starting - will be true if the DeviceFinder is starting, false if it is stopping.

isRunning

public abstract boolean isRunning()

Check whether this component has been started.

Returns:

the component has started successfully and is ready to perform any service it offers.

ensureRunning

protected void ensureRunning()

Helper method to throw an IllegalStateException if we are not currently running.

Throws:

IllegalStateException - if the component is not running