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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.binding.local;
import java.util.logging.Logger;
import org.apache.tuscany.sca.core.invocation.AsyncResponseInvoker;
import org.apache.tuscany.sca.core.invocation.InterceptorAsyncImpl;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.InvokerAsyncResponse;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.runtime.RuntimeEndpointReference;
/**
* Interceptor used by the SCA Binding on the service side chain to provide a mechanism for optimising
* invocations when the reference and the service involved are both in the same JVM, and thus the need
* to use a transport of any kind is unnecessary.
*
*/
public class LocalSCABindingInvocationInterceptor extends InterceptorAsyncImpl {
private static final Logger logger = Logger.getLogger(LocalSCABindingInvocationInterceptor.class.getName());
private Invoker next;
private boolean skipPrevious;
public LocalSCABindingInvocationInterceptor() {
super();
} // end constructor
public Message invoke(Message msg) {
return next.invoke(msg);
} // end method invoke
public Invoker getNext() {
return next;
} // end method getNext
public void setNext(Invoker next) {
this.next = next;
} // end method setNext
/**
* Process request method is simply a passthrough
*/
public Message processRequest(Message msg) {
return msg ;
} // end method processRequest
/**
* Handle an async response
* - deals with the local SCA binding case only (at present)
* - in this case, extract the async response invoker from the message header and call the EPR
* that is present in the invoker, which is in fact the local EPR from which the original forward
* request came
*/
public void invokeAsyncResponse(Message msg) {
@SuppressWarnings("unchecked")
AsyncResponseInvoker<?> respInvoker =
(AsyncResponseInvoker<?>)msg.getHeaders().get("ASYNC_RESPONSE_INVOKER");
if( respInvoker != null && "SCA_LOCAL".equals(respInvoker.getBindingType()) ) {
// Handle the locally optimised case
RuntimeEndpointReference responseEPR = (RuntimeEndpointReference)respInvoker.getResponseTargetAddress();
msg.setFrom(responseEPR);
// Handle async response Relates_To message ID value
String msgID = respInvoker.getRelatesToMsgID();
msg.getHeaders().put("RELATES_TO", msgID);
// Call the processing on the reference chain directly
responseEPR.invokeAsyncResponse(msg);
// Prevent the response being processed by the rest of the service chain
return;
} else {
// Carry on processing the response by the rest of the service chain
InvokerAsyncResponse thePrevious = (InvokerAsyncResponse)getPrevious();
if (thePrevious != null ) thePrevious.invokeAsyncResponse(msg);
return;
} // end if
} // end method invokeAsyncResponse
/**
* processResponse is not called during async response handling (all handled by invokeAsyncResponse)
* - this version is a dummy which does nothing.
*/
public Message processResponse(Message msg) {
return msg;
} // end method processResponse
} // end class
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