org.universAAL.middleware.context

Class ContextPublisher

java.lang.Object

org.universAAL.middleware.bus.member.BusMember

org.universAAL.middleware.bus.member.Publisher

org.universAAL.middleware.context.ContextPublisher

Direct Known Subclasses:

AuthenticationPublisher, CPublisher, DefaultContextPublisher, ProxyContextPublisher, PublisherWrapper, ReliabilityReasonerPublisher, SessionPublisher

public abstract class ContextPublisher
extends Publisher

Provides the interface to be implemented by context publishers together with shared code. Only instances of this class can publish context events. The convention of the context bus regarding the registration parameters is the following:

• ContextPublishers provide only at the registration time info about themselves using ContextProvider.
• ContextSubscribers may pass an array of ContextEventPatterns as their initial subscriptions and can always add new (and remove old) subscriptions dynamically.

Author:

mtazari - Saied Tazari

Field Summary

Fields inherited from class org.universAAL.middleware.bus.member.BusMember

busResourceURI, owner, theBus

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ContextPublisher(ModuleContext context, ContextProvider providerInfo) Creates a Context Publisher with the associated Context Provider Information

Method Summary

Modifier and Type	Method and Description
void	busDyingOut(AbstractBus b) This method is called when the bus is stopped to announce this to the bus members.
abstract void	communicationChannelBroken() Method to be called when the communication of the Publisher with the Context Bus is lost.
String	getMyID()
void	publish(ContextEvent e) Forward a Context Event through the Context Bus

Methods inherited from class org.universAAL.middleware.bus.member.BusMember

close, getComment, getLabel, getType, getURI, setComment, setLabel

Methods inherited from class java.lang.Object

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

Constructor Detail

ContextPublisher

protected ContextPublisher(ModuleContext context,
                           ContextProvider providerInfo)

Creates a Context Publisher with the associated Context Provider Information

Parameters:

context - The context of the Bundle creating the Publisher

providerInfo - The Information describing the Publisher

Method Detail

communicationChannelBroken

public abstract void communicationChannelBroken()

Method to be called when the communication of the Publisher with the Context Bus is lost.

busDyingOut

public final void busDyingOut(AbstractBus b)

Description copied from class: BusMember

This method is called when the bus is stopped to announce this to the bus members.

Specified by:

busDyingOut in class BusMember

Parameters:

b - bus on which this member has been registered

See Also:

AbstractBus

publish

public final void publish(ContextEvent e)

Forward a Context Event through the Context Bus

Parameters:

e - The Context Event to forward

Throws:

NullPointerException - if the event is null

getMyID

public String getMyID()