/*
* 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.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;
import org.apache.tuscany.sca.core.invocation.ThreadMessageContext;
import org.apache.tuscany.sca.interfacedef.ConversationSequence;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.InvocationChain;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.apache.tuscany.sca.scope.InstanceWrapper;
import org.apache.tuscany.sca.scope.Scope;
import org.apache.tuscany.sca.scope.ScopeContainer;
import org.apache.tuscany.sca.scope.ScopedRuntimeComponent;
import org.apache.tuscany.sca.scope.TargetResolutionException;
/**
* Responsible for synchronously dispatching an invocation to a Java component
* implementation instance
*
* @version $Rev: 538423 $ $Date: 2007-05-16 05:11:06 +0100 (Wed, 16 May 2007) $
*/
public class JavaTargetInvoker implements TargetInvoker {
protected Method operation;
protected boolean stateless;
protected InstanceWrapper target;
protected boolean cacheable;
private final RuntimeComponent component;
private final ScopeContainer scopeContainer;
public JavaTargetInvoker(Method operation, RuntimeComponent component) {
assert operation != null : "Operation method cannot be null";
this.operation = operation;
this.component = component;
this.scopeContainer = ((ScopedRuntimeComponent) component).getScopeContainer();
stateless = Scope.STATELESS == this.scopeContainer.getScope();
}
@Override
public JavaTargetInvoker clone() throws CloneNotSupportedException {
try {
JavaTargetInvoker invoker = (JavaTargetInvoker)super.clone();
invoker.target = null;
return invoker;
} catch (CloneNotSupportedException e) {
return null; // will not happen
}
}
/**
* Resolves the target service instance or returns a cached one
*/
protected InstanceWrapper getInstance(ConversationSequence sequence, Object contextId)
throws TargetResolutionException, InvalidConversationSequenceException {
if (sequence == null) {
if (cacheable) {
if (target == null) {
target = scopeContainer.getWrapper(contextId);
}
return target;
} else {
return scopeContainer.getWrapper(contextId);
}
} else {
switch (sequence) {
case CONVERSATION_START:
assert !cacheable;
return scopeContainer.getWrapper(contextId);
case CONVERSATION_CONTINUE:
case CONVERSATION_END:
assert !cacheable;
return scopeContainer.getAssociatedWrapper(contextId);
default:
throw new InvalidConversationSequenceException("Unknown sequence type: " + String.valueOf(sequence));
}
}
}
public Object invokeTarget(final Object payload, final ConversationSequence sequence)
throws InvocationTargetException {
// FIXME: How to deal with other scopes
Object contextId = ThreadMessageContext.getMessageContext().getConversationID();
try {
InstanceWrapper wrapper = getInstance(sequence, contextId);
Object instance = wrapper.getInstance();
Object ret;
if (payload != null && !payload.getClass().isArray()) {
ret = operation.invoke(instance, payload);
} else {
ret = operation.invoke(instance, (Object[])payload);
}
scopeContainer.returnWrapper(wrapper, contextId);
if (sequence == ConversationSequence.CONVERSATION_END) {
// if end conversation, remove resource
scopeContainer.remove();
}
return ret;
} catch (InvocationTargetException e) {
throw e;
} catch (Exception e) {
throw new InvocationTargetException(e);
}
}
public Message invoke(Message msg) {
try {
Object messageId = msg.getMessageID();
Message workContext = ThreadMessageContext.getMessageContext();
if (messageId != null) {
workContext.setCorrelationID(messageId);
}
Object resp = invokeTarget(msg.getBody(), msg.getConversationSequence());
msg.setBody(resp);
} catch (InvocationTargetException e) {
msg.setFaultBody(e.getCause());
}
return msg;
}
public boolean isCacheable() {
return cacheable;
}
public void setCacheable(boolean cacheable) {
this.cacheable = cacheable;
}
protected InvocationChain getInvocationChain(List<InvocationChain> chains, Operation targetOperation) {
for (InvocationChain chain : chains) {
if (chain.getTargetOperation().equals(targetOperation)) {
return chain;
}
}
return null;
}
}