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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.spi.wire;
import java.lang.reflect.InvocationTargetException;
import java.net.URI;
import java.util.LinkedList;
import org.apache.tuscany.spi.model.Operation;
import org.apache.tuscany.spi.model.ServiceContract;
/**
* Base class for performing invocations on a wire. Subclasses are responsible for retrieving and supplying the
* appropriate chain, target invoker, and invocation arguments.
*
* @version $Rev$ $Date$
*/
public abstract class AbstractInvocationHandler {
private boolean conversationStarted;
protected Object invoke(InvocationChain chain,
TargetInvoker invoker,
Object[] args,
Object correlationId,
LinkedList<URI> callbackUris)
throws Throwable {
Interceptor headInterceptor = chain.getHeadInterceptor();
if (headInterceptor == null) {
try {
// short-circuit the dispatch and invoke the target directly
TargetInvoker targetInvoker = chain.getTargetInvoker();
if (targetInvoker == null) {
String name = chain.getOperation().getName();
throw new AssertionError("No target invoker [" + name + "]");
}
return targetInvoker.invokeTarget(args, TargetInvoker.NONE);
} catch (InvocationTargetException e) {
// the cause was thrown by the target so throw it
throw e.getCause();
}
} else {
Message msg = new MessageImpl();
msg.setTargetInvoker(invoker);
if (correlationId != null) {
msg.setCorrelationId(correlationId);
}
if (callbackUris != null) {
msg.setCallbackUris(callbackUris);
}
Operation operation = chain.getOperation();
ServiceContract contract = operation.getServiceContract();
if (contract.isConversational()) {
int sequence = chain.getOperation().getConversationSequence();
if (sequence == Operation.CONVERSATION_END) {
msg.setConversationSequence(TargetInvoker.END);
conversationStarted = false;
} else if (sequence == Operation.CONVERSATION_CONTINUE) {
if (conversationStarted) {
msg.setConversationSequence(TargetInvoker.CONTINUE);
} else {
conversationStarted = true;
msg.setConversationSequence(TargetInvoker.START);
}
}
}
msg.setBody(args);
// dispatch the wire down the chain and get the response
Message resp = headInterceptor.invoke(msg);
Object body = resp.getBody();
if (resp.isFault()) {
throw (Throwable) body;
}
return body;
}
}
}
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