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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.core.context.impl;
import java.util.List;
import org.apache.tuscany.sca.assembly.Endpoint;
import org.apache.tuscany.sca.assembly.EndpointReference;
import org.apache.tuscany.sca.context.CompositeContext;
import org.apache.tuscany.sca.context.ThreadMessageContext;
import org.apache.tuscany.sca.core.invocation.Constants;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.runtime.RuntimeEndpointReference;
import org.oasisopen.sca.ServiceRuntimeException;
public class CallbackServiceReferenceImpl<B> extends ServiceReferenceImpl<B> {
private RuntimeEndpointReference callbackEPR;
private List<? extends EndpointReference> callbackEPRs;
private Endpoint resolvedEndpoint;
// Holds the ID of the Message that caused the creation of this CallbackServiceReference
private String msgID;
/**
* Gets the message ID associated with this callback reference
* @return the message ID
*/
public String getMsgID() {
return msgID;
}
/*
* Public constructor for Externalizable serialization/deserialization
*/
public CallbackServiceReferenceImpl() {
super();
}
public CallbackServiceReferenceImpl(Class<B> interfaze,
List<? extends EndpointReference> callbackEPRs) {
super(interfaze, null, getCompositeContext(callbackEPRs));
this.callbackEPRs = callbackEPRs;
init();
}
private static CompositeContext getCompositeContext(List<? extends EndpointReference> callbackEPRs) {
if(!callbackEPRs.isEmpty()) {
RuntimeEndpointReference epr = (RuntimeEndpointReference) callbackEPRs.get(0);
return epr.getCompositeContext();
}
return null;
}
public void init() {
Message msgContext = ThreadMessageContext.getMessageContext();
callbackEPR = selectCallbackEPR(msgContext);
if (callbackEPR == null) {
throw new ServiceRuntimeException("No callback binding found for " + msgContext.getTo().toString());
}
resolvedEndpoint = msgContext.getFrom().getCallbackEndpoint();
// Capture the Message ID from the message which caused the creation of this CallBackServiceReference
this.msgID = (String) msgContext.getHeaders().get(Constants.MESSAGE_ID);
}
@Override
protected B createProxy() throws Exception {
return proxyFactory.createCallbackProxy(this);
}
public RuntimeEndpointReference getCallbackEPR() {
if (resolvedEndpoint == null) {
return null;
} else {
return cloneAndBind(callbackEPR);
}
}
public Endpoint getResolvedEndpoint() {
return resolvedEndpoint;
}
private RuntimeEndpointReference selectCallbackEPR(Message msgContext) {
// look for callback binding with same name as service binding
Endpoint to = msgContext.getTo();
if (to == null) {
//FIXME: need better exception
throw new ServiceRuntimeException("Destination for forward call is not available");
}
for (EndpointReference epr : callbackEPRs) {
if (epr.getBinding().getName().equals(to.getBinding().getName())) {
return (RuntimeEndpointReference) epr;
}
}
// if no match, look for callback binding with same type as service binding
for (EndpointReference epr : callbackEPRs) {
if (epr.getBinding().getType().equals(to.getBinding().getType())) {
return (RuntimeEndpointReference) epr;
}
}
// no suitable callback wire was found
return null;
}
private RuntimeEndpointReference cloneAndBind(RuntimeEndpointReference endpointReference) {
if (resolvedEndpoint != null) {
try {
RuntimeEndpointReference epr = (RuntimeEndpointReference)endpointReference.clone();
epr.setTargetEndpoint(resolvedEndpoint);
return epr;
} catch (CloneNotSupportedException e) {
// will not happen
throw new ServiceRuntimeException(e);
}
} else {
return null;
}
}
}
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