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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.core.implementation.composite;
import java.net.URI;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import org.apache.tuscany.spi.event.Event;
import org.apache.tuscany.spi.extension.CompositeComponentExtension;
import org.apache.tuscany.spi.wire.Wire;
import org.apache.tuscany.core.component.event.ComponentStop;
/**
* The standard implementation of a composite component. Autowiring is performed by delegating to the parent composite.
*
* @version $Rev$ $Date$
*/
public class CompositeComponentImpl extends CompositeComponentExtension {
public static final int DEFAULT_WAIT = 1000 * 60;
// Blocking latch to ensure the composite is initialized exactly once prior to servicing requests
protected CountDownLatch initializeLatch = new CountDownLatch(1);
protected final Object lock = new Object();
// Indicates whether the composite context has been initialized
protected boolean initialized;
/**
* Constructor
*
* @param name the name of this Component
*/
public CompositeComponentImpl(URI name) {
super(name);
}
public void attachWire(Wire wire) {
throw new UnsupportedOperationException();
}
public void attachWires(List<Wire> wires) {
throw new UnsupportedOperationException();
}
public List<Wire> getWires(String name) {
throw new UnsupportedOperationException();
}
public void attachCallbackWire(Wire wire) {
throw new UnsupportedOperationException();
}
public void start() {
synchronized (lock) {
if (lifecycleState != UNINITIALIZED && lifecycleState != STOPPED) {
throw new IllegalStateException("Composite not in UNINITIALIZED state");
}
initializeLatch.countDown();
initialized = true;
lifecycleState = INITIALIZED;
}
}
public void stop() {
if (lifecycleState == STOPPED) {
return;
}
publish(new ComponentStop(this, getUri()));
// 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);
}
/**
* Blocks until the composite context has been initialized
*/
protected void checkInit() throws ComponentTimeoutException {
if (!initialized) {
try {
/* block until the composite has initialized */
boolean success = initializeLatch.await(DEFAULT_WAIT, TimeUnit.MILLISECONDS);
if (!success) {
throw new ComponentTimeoutException("Timeout waiting for context to initialize");
}
} catch (InterruptedException e) { // should not happen
}
}
}
}
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