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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.notification;
import java.util.ArrayList;
import java.util.List;
import org.apache.tuscany.sca.assembly.ComponentReference;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.InvocationChain;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.apache.tuscany.sca.runtime.RuntimeComponentReference;
import org.apache.tuscany.sca.runtime.RuntimeWire;
/**
* Turns invoke into remote message fan-out
*
* @version $Rev$ $Date$
*/
public class NotificationComponentInvoker implements Invoker {
private static final Message RESPONSE = new ImmutableMessage();
private List<InvocationChain> subscriberInvocationChains;
private Operation operation;
private RuntimeComponent component;
public NotificationComponentInvoker(Operation operation, RuntimeComponent component) {
this.subscriberInvocationChains = null;
this.operation = operation;
this.component = component;
}
public Message invoke(Message msg) {
addSubscriberInvocationChains();
// REVIEW Should this be done in separate thread(s)?
// REVIEW Should separate copies of message be used?
Object msgBody = msg.getBody();
for (InvocationChain subscriberInvocationChain : subscriberInvocationChains) {
Invoker chainInvoker = subscriberInvocationChain.getHeadInvoker();
msg.setBody(msgBody);
chainInvoker.invoke(msg);
}
return RESPONSE;
}
private void addSubscriberInvocationChains() {
if (subscriberInvocationChains == null) {
subscriberInvocationChains = new ArrayList<InvocationChain>();
for (ComponentReference reference : component.getReferences()) {
if (reference.getName().indexOf("$self$") >= 0) {
continue;
}
RuntimeComponentReference rtCompRef = null;
if (reference instanceof RuntimeComponentReference) {
rtCompRef = (RuntimeComponentReference)reference;
}
else {
throw new RuntimeException("Need a runtime component reference");
}
for(RuntimeWire wire : rtCompRef.getRuntimeWires()) {
// This is much less efficient now !!
List<InvocationChain> chains = wire.getInvocationChains();
InvocationChain chain = getInvocationChain(chains, operation);
subscriberInvocationChains.add(chain);
}
}
}
}
private InvocationChain getInvocationChain(List<InvocationChain> chains, Operation operation) {
InvocationChain chain = null;
for (InvocationChain ch : chains) {
if (ch.getTargetOperation().equals(operation)) {
chain = ch;
break;
}
}
if (chain == null) {
for (InvocationChain ch : chains) {
if (ch.getTargetOperation().getName().equals(operation.getName())) {
chain = ch;
break;
}
}
if (chain == null) {
throw new RuntimeException("Can't find a compatible chain");
}
}
return chain;
}
}
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