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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.implementation.java.invocation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.apache.tuscany.sca.core.context.InstanceWrapper;
import org.apache.tuscany.sca.core.scope.Scope;
import org.apache.tuscany.sca.core.scope.ScopeContainer;
import org.apache.tuscany.sca.core.scope.ScopedRuntimeComponent;
import org.apache.tuscany.sca.implementation.java.JavaImplementation;
import org.apache.tuscany.sca.interfacedef.ConversationSequence;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.invocation.DataExchangeSemantics;
import org.apache.tuscany.sca.runtime.EndpointReference;
import org.apache.tuscany.sca.runtime.ReferenceParameters;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
/**
* Responsible for synchronously dispatching an invocation to a Java component
* implementation instance
*
* @version $Rev: 634778 $ $Date: 2008-03-07 10:58:16 -0800 (Fri, 07 Mar 2008) $
*/
public class JavaImplementationInvoker implements Invoker, DataExchangeSemantics {
protected Operation operation;
protected Method method;
protected boolean allowsPBR;
@SuppressWarnings("unchecked")
protected final ScopeContainer scopeContainer;
public JavaImplementationInvoker(Operation operation, Method method, RuntimeComponent component) {
assert method != null : "Operation method cannot be null";
this.method = method;
this.operation = operation;
this.scopeContainer = ((ScopedRuntimeComponent)component).getScopeContainer();
this.allowsPBR = ((JavaImplementation)component.getImplementation()).isAllowsPassByReference(method);
}
@SuppressWarnings("unchecked")
public Message invoke(Message msg) {
Operation op = msg.getOperation();
if (op == null) {
op = this.operation;
}
ConversationSequence sequence = op.getConversationSequence();
Object payload = msg.getBody();
Object contextId = null;
EndpointReference from = msg.getFrom();
ReferenceParameters parameters = null;
if (from != null) {
parameters = from.getReferenceParameters();
}
// check what sort of context is required
if (scopeContainer != null) {
Scope scope = scopeContainer.getScope();
if (scope == Scope.REQUEST) {
contextId = Thread.currentThread();
} else if (scope == Scope.CONVERSATION && parameters != null) {
contextId = parameters.getConversationID();
}
}
try {
// The following call might create a new conversation, as a result, the msg.getConversationID() might
// return a new value
InstanceWrapper wrapper = scopeContainer.getWrapper(contextId);
// detects whether the scope container has created a conversation Id. This will
// happen in the case that the component has conversational scope but only the
// callback interface is conversational. Or in the callback case if the service interface
// is conversational and the callback interface isn't. If we are in this situation we need
// to get the contextId of this component and remove it after we have invoked the method on
// it. It is possible that the component instance will not go away when it is removed below
// because a callback conversation will still be holding a reference to it
boolean removeTemporaryConversationalComponentAfterCall = false;
if (parameters != null && (contextId == null) && (parameters.getConversationID() != null)) {
contextId = parameters.getConversationID();
removeTemporaryConversationalComponentAfterCall = true;
}
Object instance = wrapper.getInstance();
Object ret;
if (payload != null && !payload.getClass().isArray()) {
ret = method.invoke(instance, payload);
} else {
ret = method.invoke(instance, (Object[])payload);
}
scopeContainer.returnWrapper(wrapper, contextId);
if ((sequence == ConversationSequence.CONVERSATION_END) || (removeTemporaryConversationalComponentAfterCall)) {
// if end conversation, or we have the special case where a conversational
// object was created to service the stateless half of a stateful component
scopeContainer.remove(contextId);
parameters.setConversationID(null);
}
msg.setBody(ret);
} catch (InvocationTargetException e) {
msg.setFaultBody(e.getCause());
} catch (Exception e) {
msg.setFaultBody(e);
}
return msg;
}
public boolean allowsPassByReference() {
return allowsPBR;
}
}
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