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diff --git a/branches/sca-java-integration/sca/kernel/spi/src/main/java/org/apache/tuscany/spi/services/discovery/AbstractDiscoveryService.java b/branches/sca-java-integration/sca/kernel/spi/src/main/java/org/apache/tuscany/spi/services/discovery/AbstractDiscoveryService.java
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+++ b/branches/sca-java-integration/sca/kernel/spi/src/main/java/org/apache/tuscany/spi/services/discovery/AbstractDiscoveryService.java
@@ -0,0 +1,149 @@
+/*
+ * 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;
+
+}