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/*
* Copyright (c) OSGi Alliance (2008, 2009). 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.osgi.service.discovery;
/**
* Interface of trackers for discovered remote services.
* <p>
* When a service implementing this interface is registered with the framework,
* then <code>Discovery</code> will notify it about remote services matching one
* of the provided criteria and will keep notifying it on changes of information
* known to Discovery regarding this services.
*
* <code>Discovery</code> may deliver notifications on discovered services to a
* <code>DiscoveredServiceTracker</code> out of order and may concurrently call
* and/or reenter a <code>DiscoveredServiceTracker</code>.
*
* @ThreadSafe
*/
public interface DiscoveredServiceTracker {
/**
* Optional ServiceRegistration property which contains service interfaces
* this tracker is interested in.
* <p>
* Value of this property is of type
* <code>Collection (<? extends String>)</code>. May be
* <code>null</code> or empty.
*/
public static final String INTERFACE_MATCH_CRITERIA = "osgi.remote.discovery.interest.interfaces";
/**
* Optional ServiceRegistration property which contains filters for services
* this tracker is interested in.
* <p>
* Note that these filters need to take into account service publication
* properties which are not necessarily the same as properties under which a
* service is registered. See {@link ServicePublication} for some standard
* properties used to publish service metadata.
* <p>
* The following sample filter will make <code>Discovery</code> notify the
* <code>DiscoveredServiceTracker</code> about services providing interface
* 'my.company.foo' of version '1.0.1.3':
* <code>"(&(service.interface=my.company.foo)(service.interface.version=my.company.foo|1.0.1.3))"</code>.
* <p>
* Value of this property is of type
* <code>Collection (<? extends String>)</code>. May be
* <code>null</code>. or empty
*/
public static final String FILTER_MATCH_CRITERIA = "osgi.remote.discovery.interest.filters";
/**
* Receives notification that information known to <code>Discovery</code>
* regarding a remote service has changed.
* <p>
* The tracker is only notified about remote services which fulfill the
* matching criteria, either one of the interfaces or one of the filters,
* provided as properties of this service.
* <p>
* If multiple criteria match, then the tracker is notified about each of
* them. This can be done either by a single notification callback or by
* multiple subsequent ones.
*
* @param notification the <code>DiscoveredServiceNotification</code> object
* describing the change. Is never <code>null</code>.
*/
void serviceChanged(DiscoveredServiceNotification notification);
}
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