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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.component.scope;
import java.net.URI;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.osoa.sca.annotations.EagerInit;
import org.osoa.sca.annotations.Service;
import org.apache.tuscany.api.annotation.Monitor;
import org.apache.tuscany.spi.component.AtomicComponent;
import org.apache.tuscany.spi.component.InstanceWrapper;
import org.apache.tuscany.spi.component.ScopeContainerMonitor;
import org.apache.tuscany.spi.component.TargetDestructionException;
import org.apache.tuscany.spi.component.TargetInitializationException;
import org.apache.tuscany.spi.component.TargetNotFoundException;
import org.apache.tuscany.spi.component.TargetResolutionException;
import org.apache.tuscany.spi.component.ScopeContainer;
import org.apache.tuscany.spi.model.Scope;
/**
* A scope context which manages atomic component instances keyed by composite
*
* @version $Rev$ $Date$
*/
@EagerInit
@Service(ScopeContainer.class)
public class CompositeScopeContainer<KEY> extends AbstractScopeContainer<KEY> {
private static final InstanceWrapper<Object> EMPTY = new InstanceWrapper<Object>() {
public Object getInstance() {
return null;
}
public boolean isStarted() {
return true;
}
public void start() throws TargetInitializationException {
}
public void stop() throws TargetDestructionException {
}
};
// there is one instance per component so we can index directly
private final Map<AtomicComponent<?>, InstanceWrapper<?>> instanceWrappers =
new ConcurrentHashMap<AtomicComponent<?>, InstanceWrapper<?>>();
public CompositeScopeContainer(@Monitor ScopeContainerMonitor monitor) {
super(Scope.COMPOSITE, monitor);
}
public <T> void register(AtomicComponent<T> component, URI groupId) {
super.register(component, groupId);
instanceWrappers.put(component, EMPTY);
}
public <T> void unregister(AtomicComponent<T> component) {
// FIXME should this component be destroyed already or do we need to stop it?
instanceWrappers.remove(component);
super.unregister(component);
}
public synchronized void stop() {
super.stop();
instanceWrappers.clear();
}
public <T> InstanceWrapper<T> getWrapper(AtomicComponent<T> component, KEY contextId)
throws TargetResolutionException {
assert instanceWrappers.containsKey(component);
@SuppressWarnings("unchecked")
InstanceWrapper<T> wrapper = (InstanceWrapper<T>) instanceWrappers.get(component);
if (wrapper == EMPTY) {
// FIXME is there a potential race condition here that may result in two instances being created
wrapper = createInstance(component);
instanceWrappers.put(component, wrapper);
wrapper.start();
destroyQueues.get(contextId).add(wrapper);
}
return wrapper;
}
public <T> InstanceWrapper<T> getAssociatedWrapper(AtomicComponent<T> component, KEY contextId)
throws TargetResolutionException {
assert instanceWrappers.containsKey(component);
@SuppressWarnings("unchecked")
InstanceWrapper<T> wrapper = (InstanceWrapper<T>) instanceWrappers.get(component);
if (wrapper == EMPTY) {
throw new TargetNotFoundException(component.getUri().toString());
}
return wrapper;
}
}
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