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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.apache.tuscany.sca.osgi.remoteserviceadmin;
-
-/**
- * A white board service that represents a listener for endpoints.
- *
- * An Endpoint Listener represents a participant in the distributed model that
- * is interested in Endpoint Descriptions.
- *
- * This white board service can be used in many different scenarios. However, the
- * primary use case is to allow a remote manager to be informed of End Point
- * Descriptions available in the network and inform the network about available
- * End Point Descriptions.
- *
- * Both the network bundle and the manager bundle register an Endpoint
- * Listener service. The manager informs the network bundle about End Points
- * that it creates. The network bundles then uses a protocol like
- * SLP to announce these local end-points to the network.
- *
- * If the network bundle discovers a new Endpoint through its discovery
- * protocol, then it sends an End Point Description to all the End Point
- * Listener services that are registered (except its own) that have specified an
- * interest in that endpoint.
- *
- * Endpoint Listener services can express their <i>scope</i> with the service
- * property {@link #ENDPOINT_LISTENER_SCOPE}. This service property is a list
- * of filters. An Endpoint Description should only be given to a Endpoint
- * Listener when there is at least one filter that matches the Endpoint
- * Description properties. given to it.
- *
- * This filter model is quite flexible. For example, a discovery bundle is only
- * interested in locally originating Endpoint Descriptions. The following filter
- * ensure that it only sees local endpoints.
- *
- * <pre>
- * (org.osgi.framework.uuid=72dc5fd9-5f8f-4f8f-9821-9ebb433a5b72)
- * </pre>
- *
- * In the same vein, a manager that is only interested in remote Endpoint
- * Descriptions can use a filter like:
- *
- * <pre>
- * (!(org.osgi.framework.uuid=72dc5fd9-5f8f-4f8f-9821-9ebb433a5b72))
- * </pre>
- *
- * Where in both cases, the given UUID is the UUID of the local framework that
- * can be found in the Framework properties.
- *
- * The Endpoint Listener's scope maps very well to the service hooks. A
- * manager can just register all filters found from the Listener Hook as its
- * scope. This will automatically provide it with all known endpoints that match
- * the given scope, without having to inspect the filter string.
- *
- * In general, when an Endpoint Description is discovered, it should be
- * dispatched to all registered Endpoint Listener services. If a new Endpoint
- * Listener is registered, it should be informed about all currently known
- * Endpoints that match its scope. If a getter of the Endpoint Listener service
- * is unregistered, then all its registered Endpoint Description objects must be
- * removed.
- *
- * The Endpoint Listener models a <i>best effort</i> approach. Participating
- * bundles should do their utmost to keep the listeners up to date, but
- * implementers should realize that many endpoints come through unreliable
- * discovery processes.
- *
- *
- * @ThreadSafe
- */
-public interface EndpointListener {
- /**
- * Specifies the interest of this listener with filters. This listener is
- * only interested in Endpoint Descriptions where its properties match the
- * given filter. The type of this property must be <code>String+</code>.
- */
- String ENDPOINT_LISTENER_SCOPE = "endpoint.listener.scope";
-
- /**
- * Register an endpoint with this listener.
- *
- * If the endpoint matches one of the filters registered with the
- * {@link #ENDPOINT_LISTENER_SCOPE} service property then this filter should
- * be given as the <code>matchedFilter</code> parameter.
- *
- * When this service is first registered or it is modified, it should
- * receive all known endpoints matching the filter.
- *
- * @param endpoint
- * The Endpoint Description to be published
- * @param matchedFilter
- * The filter from the {@link #ENDPOINT_LISTENER_SCOPE} that
- * matched the endpoint, must not be <code>null</code>.
- */
- void endpointAdded(EndpointDescription endpoint, String matchedFilter);
-
- /**
- * Remove the registration of an endpoint.
- *
- * If an endpoint that was registered with the {@link #endpointAdded(EndpointDescription, String)}
- * method is no longer available then this method should be called. This
- * will remove the endpoint from the listener.
- *
- * It is not necessary to remove endpoints when the service is unregistered
- * or modified in such a way that not all endpoints match the interest
- * filter anymore.
- *
- * @param endpoint
- * The Endpoint Description that is no longer valid.
- * @param matchedFilter
- * The filter from the {@link #ENDPOINT_LISTENER_SCOPE} that
- * matched the endpoint, must not be <code>null</code>.
- */
- void endpointRemoved(EndpointDescription endpoint, String matchedFilter);
-}