livespace.services.osgi
Class SingleEntityDependency

java.lang.Object
  livespace.osgi.Dependency
      livespace.services.osgi.SingleEntityDependency

All Implemented Interfaces:

PropertyListener, EventListener

Direct Known Subclasses:

ParticularEntityDependency

public class SingleEntityDependency
extends Dependency
implements PropertyListener

A dependency on a single Livespace entity being available.

Author:

Matthew Phillips

Field Summary

protected EntityClient	client
protected Dependencies	dependencies
protected String	entityType

Fields inherited from class livespace.osgi.Dependency

notReadyListeners, readyListeners

Constructor Summary

SingleEntityDependency(org.osgi.framework.BundleContext context, String entityType)
Create a new dependency on an entity of a given type being available in the local room.

Method Summary

protected void	elvinOrRoomNotReady() If either the elvin or room service is not available then dispose the client and call Dependency.updateReady()
boolean	isReady() True if the dependency is ready to be used.
void	propertyValueChanged(PropertyEvent e)
void	start() Start the dependency looking for its required resources.
void	stop() Stop the dependency looking for its required resources.
Object	value() Convenience method to get the resource acquired by this dependency.

Methods inherited from class livespace.osgi.Dependency

setReady, updateReady

Methods inherited from class java.lang.Object

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

Field Detail

entityType

protected String entityType

client

protected EntityClient client

dependencies

protected Dependencies dependencies

Constructor Detail

SingleEntityDependency

public SingleEntityDependency(org.osgi.framework.BundleContext context,
                              String entityType)

Create a new dependency on an entity of a given type being available in the local room.

Method Detail

start

public void start()
           throws Exception

Description copied from class: Dependency

Start the dependency looking for its required resources. The ready state will change when it is (which may be immediately as part of this call).

Specified by:

start in class Dependency

Throws:

Exception

stop

public void stop()
          throws Exception

Description copied from class: Dependency

Stop the dependency looking for its required resources. The ready state may change, perhaps immediately as part of this call.

Specified by:

stop in class Dependency

Throws:

Exception

value

public Object value()

Description copied from class: Dependency

Convenience method to get the resource acquired by this dependency. Null if dependency is not ready.

Specified by:

value in class Dependency

isReady

public boolean isReady()

Description copied from class: Dependency

True if the dependency is ready to be used.

Specified by:

isReady in class Dependency

elvinOrRoomNotReady

protected void elvinOrRoomNotReady()

If either the elvin or room service is not available then dispose the client and call Dependency.updateReady()

propertyValueChanged

public void propertyValueChanged(PropertyEvent e)

Specified by:

propertyValueChanged in interface PropertyListener