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  * Copyright (c) OSGi Alliance (2002, 2010). All Rights Reserved.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.osgi.service.upnp;
UPnP Events are mapped and delivered to applications according to the OSGi whiteboard model. An application that wishes to be notified of events generated by a particular UPnP Device registers a service extending this interface.

The notification call from the UPnP Service to any UPnPEventListener object must be done asynchronous with respect to the originator (in a separate thread).

Upon registration of the UPnP Event Listener service with the Framework, the service is notified for each variable which it listens for with an initial event containing the current value of the variable. Subsequent notifications only happen on changes of the value of the variable.

A UPnP Event Listener service filter the events it receives. This event set is limited using a standard framework filter expression which is specified when the listener service is registered.

The filter is specified in a property named "upnp.filter" and has as a value an object of type org.osgi.framework.Filter.

When the Filter is evaluated, the folowing keywords are recognized as defined as literal constants in the UPnPDevice class.

The valid subset of properties for the registration of UPnP Event Listener services are:

  • UPnPDevice.TYPE-- Which type of device to listen for events.
  • UPnPDevice.ID-- The ID of a specific device to listen for events.
  • UPnPService.TYPE-- The type of a specific service to listen for events.
  • UPnPService.ID-- The ID of a specific service to listen for events.

$Id: 9b3521a5da0f062c4bcbd6ffb4039c140c093ea5 $
public interface UPnPEventListener {
Key for a service property having a value that is an object of type org.osgi.framework.Filter and that is used to limit received events.
	static final String	UPNP_FILTER"upnp.filter";

Callback method that is invoked for received events. The events are collected in a Dictionary object. Each entry has a String key representing the event name (= state variable name) and the new value of the state variable. The class of the value object must match the class specified by the UPnP State Variable associated with the event. This method must be called asynchronously

deviceId ID of the device sending the events
serviceId ID of the service sending the events
events Dictionary object containing the new values for the state variables that have changed.
	void notifyUPnPEvent(String deviceIdString serviceIdDictionary events);
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