From 132aa8a77685ec92bc90c03f987650d275a7b639 Mon Sep 17 00:00:00 2001 From: lresende Date: Mon, 30 Sep 2013 06:59:11 +0000 Subject: 2.0.1 RC1 release tag git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1527464 13f79535-47bb-0310-9956-ffa450edef68 --- .../invocation/JavaAsyncResponseInvokerImpl.java | 122 +++++++++++++++++++++ 1 file changed, 122 insertions(+) create mode 100644 sca-java-2.x/tags/2.0.1-RC1/modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/invocation/JavaAsyncResponseInvokerImpl.java (limited to 'sca-java-2.x/tags/2.0.1-RC1/modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/invocation/JavaAsyncResponseInvokerImpl.java') diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/invocation/JavaAsyncResponseInvokerImpl.java b/sca-java-2.x/tags/2.0.1-RC1/modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/invocation/JavaAsyncResponseInvokerImpl.java new file mode 100644 index 0000000000..d3a7cfd3e6 --- /dev/null +++ b/sca-java-2.x/tags/2.0.1-RC1/modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/invocation/JavaAsyncResponseInvokerImpl.java @@ -0,0 +1,122 @@ +/* + * 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 asyncMessageMap; + + public JavaAsyncResponseInvokerImpl() { + + asyncMessageMap = new ConcurrentHashMap(); + } // 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 -- cgit v1.2.3