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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.sca.implementation.java.invocation;
+
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+import org.apache.tuscany.sca.core.invocation.AsyncFaultWrapper;
+import org.apache.tuscany.sca.core.invocation.AsyncResponseHandler;
+import org.apache.tuscany.sca.core.invocation.JDKAsyncResponseInvoker;
+import org.apache.tuscany.sca.invocation.Message;
+import org.oasisopen.sca.ServiceRuntimeException;
+
+/**
+ * Class which handles the asynchronous response message from an async service back to the client Java component
+ *
+ * This class provides a registration function which permits the reference invoking code to register the Future
+ * which is used to return the response to the Java component code
+ */
+public class JavaAsyncResponseInvokerImpl implements JDKAsyncResponseInvoker {
+
+ // Map used to link between async requests and async responses
+ private ConcurrentMap<String, Object> asyncMessageMap;
+
+ public JavaAsyncResponseInvokerImpl() {
+
+ asyncMessageMap = new ConcurrentHashMap<String, Object>();
+ } // end constructor
+
+ /**
+ * Deal with the asynchronous response message
+ * @param msg - the response message
+ *
+ * The response message must contain a RELATES_TO id, which is used to identify the Future that represents
+ * the operation yet to complete. The Future is then completed with the content of the message.
+ * The Future either calls back to the application code, or it is expected that the application is polling
+ * the Future for its completion.
+ */
+ @SuppressWarnings({ "rawtypes", "unchecked" })
+ public void invokeAsyncResponse(Message msg) {
+ // Obtain the Message ID for this message
+ String relatesID = getMessageRelatesID( msg );
+ if( relatesID == null )
+ throw new ServiceRuntimeException("JavaAsyncResponseInvoker - response message has no RELATES_TO id");
+
+ // Look up the response object & remove it from the Map
+ Object responseHandler = asyncMessageMap.remove(relatesID);
+
+ if( responseHandler == null )
+ throw new ServiceRuntimeException("JavaAsyncResponseInvoker - no Future matches the RELATES_TO id: " + relatesID);
+
+ // Invoke the response handler with the content of the message
+ // - in the case of a Java implementation, the response handler is a Future...
+ AsyncResponseHandler future = (AsyncResponseHandler) responseHandler;
+
+ Object payload = msg.getBody();
+ Object response;
+ if( payload == null ) {
+ System.out.println("Returned response message was null");
+ } else {
+ if (payload.getClass().isArray()) {
+ response = ((Object[])payload)[0];
+ } else {
+ response = payload;
+ } // end if
+ if( response.getClass().equals(AsyncFaultWrapper.class)) {
+ future.setWrappedFault((AsyncFaultWrapper) response );
+ } else if ( response instanceof Throwable ) {
+ future.setFault( (Throwable)response );
+ } else {
+ future.setResponse(response);
+ } // end if
+ } // end if
+
+ } // end method invokeAsyncResponse
+
+ /**
+ * Registers an Async response, which provides an ID which identifies a given response
+ * and an object which can handle the response
+ * @param id - the ID
+ * @param responseHandler - the response handler object
+ */
+ public void registerAsyncResponse( String id, Object responseHandler ) {
+ // Add the ID/response handler mapping into the table
+ if( id != null && responseHandler != null ) asyncMessageMap.put(id, responseHandler);
+ } // end method registerAsyncResponse
+
+ /**
+ * Returns the registered async response for a given ID
+ * @param id - the ID
+ * @return responseHandler - the response handler object
+ */
+ public Object getAsyncResponse( String id ) {
+ return asyncMessageMap.get(id);
+ }
+
+ /**
+ * Extracts the RELATES_TO header from the message
+ * @param msg - the Tuscany message
+ * @return - the value of the RELATES_TO header as a String
+ */
+ private String getMessageRelatesID( Message msg ) {
+ return (String)msg.getHeaders().get("RELATES_TO");
+ } // end method getMessageRelatesID
+
+} // end class JavaAsyncResponseInvoker