/*
* 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.core.implementation.composite;
import java.util.Map;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import org.w3c.dom.Document;
import org.apache.tuscany.spi.builder.Connector;
import org.apache.tuscany.spi.component.CompositeComponent;
import org.apache.tuscany.spi.component.ObjectRegistrationException;
import org.apache.tuscany.spi.component.SCAObject;
import org.apache.tuscany.spi.component.ScopeContainer;
import org.apache.tuscany.spi.event.Event;
import org.apache.tuscany.spi.extension.CompositeComponentExtension;
import org.apache.tuscany.spi.model.Operation;
import org.apache.tuscany.spi.wire.InboundWire;
import org.apache.tuscany.spi.wire.TargetInvoker;
import org.apache.tuscany.core.component.ComponentInitException;
import org.apache.tuscany.core.component.event.CompositeStart;
import org.apache.tuscany.core.component.event.CompositeStop;
import org.apache.tuscany.core.implementation.system.component.SystemSingletonAtomicComponent;
/**
* The base implementation of a composite context
*
* @version $Rev: 453798 $ $Date: 2006-10-06 15:51:51 -0700 (Fri, 06 Oct 2006) $
*/
public abstract class AbstractCompositeComponent extends CompositeComponentExtension {
public static final int DEFAULT_WAIT = 1000 * 60;
// Blocking latch to ensure the module is initialized exactly once prior to servicing requests
protected CountDownLatch initializeLatch = new CountDownLatch(1);
protected final Object lock = new Object();
// Indicates whether the module context has been initialized
protected boolean initialized;
protected ScopeContainer scopeContainer;
/**
* @param name the name of the SCA composite
* @param parent the SCA composite parent
* @param connector
* @param propertyValues the values of this composite's Properties
*/
public AbstractCompositeComponent(String name,
CompositeComponent parent,
Connector connector,
Map<String, Document> propertyValues) {
super(name, parent, connector, propertyValues);
}
public void setScopeContainer(ScopeContainer scopeContainer) {
assert this.scopeContainer == null;
this.scopeContainer = scopeContainer;
addListener(scopeContainer);
}
public <S, I extends S> void registerJavaObject(String name, Class<S> service, I instance)
throws ObjectRegistrationException {
register(new SystemSingletonAtomicComponent<S, I>(name, this, service, instance));
}
public void start() {
synchronized (lock) {
if (lifecycleState != UNINITIALIZED && lifecycleState != STOPPED) {
throw new IllegalStateException("Composite not in UNINITIALIZED state");
}
if (scopeContainer != null) {
scopeContainer.start();
}
for (SCAObject child : systemChildren.values()) {
child.start();
}
for (SCAObject child : children.values()) {
child.start();
}
initializeLatch.countDown();
initialized = true;
lifecycleState = INITIALIZED;
}
publish(new CompositeStart(this, this));
}
public void stop() {
if (lifecycleState == STOPPED) {
return;
}
publish(new CompositeStop(this, this));
for (SCAObject child : children.values()) {
child.stop();
}
for (SCAObject child : systemChildren.values()) {
child.stop();
}
if (scopeContainer != null) {
scopeContainer.stop();
}
// need to block a start until reset is complete
initializeLatch = new CountDownLatch(2);
lifecycleState = STOPPING;
initialized = false;
// allow initialized to be called
initializeLatch.countDown();
lifecycleState = STOPPED;
}
public void publish(Event event) {
if (lifecycleState == STOPPED) {
return;
}
checkInit();
super.publish(event);
}
public TargetInvoker createTargetInvoker(String targetName, Operation operation) {
return null;
}
public TargetInvoker createAsyncTargetInvoker(InboundWire wire, Operation operation) {
return null;
}
/**
* Blocks until the module context has been initialized
*/
protected void checkInit() {
if (!initialized) {
try {
/* block until the module has initialized */
boolean success = initializeLatch.await(AbstractCompositeComponent.DEFAULT_WAIT,
TimeUnit.MILLISECONDS);
if (!success) {
throw new ComponentInitException("Timeout waiting for context to initialize");
}
} catch (InterruptedException e) { // should not happen
}
}
}
}