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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.spi.services.discovery;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamReader;
import org.apache.tuscany.host.RuntimeInfo;
import org.apache.tuscany.spi.annotation.Autowire;
import org.osoa.sca.annotations.Destroy;
import org.osoa.sca.annotations.EagerInit;
import org.osoa.sca.annotations.Init;
/**
* Abstract implementation of the discovery service.
*
* @version $Revision$ $Date$
*
*/
@EagerInit
public abstract class AbstractDiscoveryService implements DiscoveryService {
/** Runtime info. */
private RuntimeInfo runtimeInfo;
/** Request listeners. */
private Map<QName, RequestListener> requestListenerMap = new ConcurrentHashMap<QName, RequestListener>();
/** Response listeners. */
private Map<QName, ResponseListener> responseListenerMap = new ConcurrentHashMap<QName, ResponseListener>();
/**
* Registers a request listener for async messages.
*
* @param messageType Message type that can be handled by the listener.
* @param listener Recipient of the async message.
*/
public void registerRequestListener(QName messageType, RequestListener listener) {
requestListenerMap.put(messageType, listener);
}
/**
* Registers a response listener for async messages.
*
* @param messageType Message type that can be handled by the listener.
* @param listener Recipient of the async message.
*/
public void registerResponseListener(QName messageType, ResponseListener listener) {
responseListenerMap.put(messageType, listener);
}
/**
* Sets the runtime info for the runtime using the discovery service.
*
* @param runtimeInfo Runtime info for the runtime using the discovery service.
*/
@Autowire
public final void setRuntimeInfo(RuntimeInfo runtimeInfo) {
this.runtimeInfo = runtimeInfo;
}
/**
* Starts the discovery service.
*/
@Init
public final void start() throws DiscoveryException {
onStart();
}
/**
* Stops the discovery service.
*/
@Destroy
public final void stop() throws DiscoveryException {
onStop();
}
/**
* Gets the runtime info for the runtime using the discovery service.
*
* @return Runtime info for the runtime using the discovery service.
*/
protected final RuntimeInfo getRuntimeInfo() {
return runtimeInfo;
}
/**
* Returns the request listener for the specified message type.
*
* @param messageType Message type for the incoming message.
* @return Listener interested in the message type.
*/
public final RequestListener getRequestListener(QName messageType) {
return requestListenerMap.get(messageType);
}
/**
* Returns the request listener for the specified message type.
*
* @param messageType Message type for the incoming message.
* @return Listener interested in the message type.
*/
public final ResponseListener getResponseListener(QName messageType) {
return responseListenerMap.get(messageType);
}
/**
* Broadcasts the messages to all runtimes in the domain.
*
* @param content Message content.
* @return The message id.
* @throws DiscoveryException In case of discovery errors.
*/
public int broadcastMessage(XMLStreamReader content) throws DiscoveryException {
return sendMessage(null, content);
}
/**
* Required to be overridden by sub-classes.
*
*/
protected abstract void onStart() throws DiscoveryException;
/**
* Required to be overridden by sub-classes.
*
*/
protected abstract void onStop() throws DiscoveryException;
}
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