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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.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import org.apache.tuscany.spi.AbstractLifecycle;
import org.apache.tuscany.spi.component.AtomicComponent;
import org.apache.tuscany.spi.component.PersistenceException;
import org.apache.tuscany.spi.component.ScopeContainer;
import org.apache.tuscany.spi.component.ScopeContainerMonitor;
import org.apache.tuscany.spi.component.TargetNotFoundException;
import org.apache.tuscany.spi.component.TargetResolutionException;
import org.apache.tuscany.spi.component.WorkContext;
import org.apache.tuscany.spi.event.Event;
import org.apache.tuscany.spi.event.EventFilter;
import org.apache.tuscany.spi.event.RuntimeEventListener;
import org.apache.tuscany.spi.event.TrueFilter;
/**
* Implements functionality common to scope contexts.
*
* @version $Rev$ $Date$
*/
public abstract class AbstractScopeContainer extends AbstractLifecycle implements ScopeContainer {
private static final EventFilter TRUE_FILTER = new TrueFilter();
protected WorkContext workContext;
protected ScopeContainerMonitor monitor;
private Map<EventFilter, List<RuntimeEventListener>> listeners;
public AbstractScopeContainer(WorkContext workContext, ScopeContainerMonitor monitor) {
this.workContext = workContext;
this.monitor = monitor;
}
public void addListener(RuntimeEventListener listener) {
addListener(TRUE_FILTER, listener);
}
public void removeListener(RuntimeEventListener listener) {
assert listener != null;
synchronized (getListeners()) {
for (List<RuntimeEventListener> currentList : getListeners().values()) {
for (RuntimeEventListener current : currentList) {
if (current == listener) {
currentList.remove(current);
return;
}
}
}
}
}
public void addListener(EventFilter filter, RuntimeEventListener listener) {
assert listener != null;
synchronized (getListeners()) {
List<RuntimeEventListener> list = getListeners().get(filter);
if (list == null) {
list = new CopyOnWriteArrayList<RuntimeEventListener>();
listeners.put(filter, list);
}
list.add(listener);
}
}
public void publish(Event event) {
assert event != null;
for (Map.Entry<EventFilter, List<RuntimeEventListener>> entry : getListeners().entrySet()) {
if (entry.getKey().match(event)) {
for (RuntimeEventListener listener : entry.getValue()) {
listener.onEvent(event);
}
}
}
}
public Object getInstance(AtomicComponent component) throws TargetResolutionException {
InstanceWrapper ctx = getInstanceWrapper(component, true);
if (ctx != null) {
if (!ctx.isStarted()) {
ctx.start();
}
return ctx.getInstance();
}
return null;
}
public Object getAssociatedInstance(AtomicComponent component) throws TargetResolutionException {
InstanceWrapper ctx = getInstanceWrapper(component, false);
if (ctx != null) {
if (!ctx.isStarted()) {
ctx.start();
}
return ctx.getInstance();
}
throw new TargetNotFoundException(component.getUri().toString());
}
public void persistNew(AtomicComponent component, String id, Object instance, long expiration)
throws PersistenceException {
throw new UnsupportedOperationException("Scope does not support persistence");
}
public void persist(AtomicComponent component, String id, Object instance, long expiration)
throws PersistenceException {
throw new UnsupportedOperationException("Scope does not support persistence");
}
public void remove(AtomicComponent component) throws PersistenceException {
throw new UnsupportedOperationException("Scope does not support persistence");
}
protected Map<EventFilter, List<RuntimeEventListener>> getListeners() {
if (listeners == null) {
listeners = new ConcurrentHashMap<EventFilter, List<RuntimeEventListener>>();
}
return listeners;
}
protected void checkInit() {
if (getLifecycleState() != RUNNING) {
throw new IllegalStateException("Scope container not running [" + getLifecycleState() + "]");
}
}
protected WorkContext getWorkContext() {
return workContext;
}
public String toString() {
return "In state [" + super.toString() + ']';
}
protected abstract InstanceWrapper getInstanceWrapper(AtomicComponent component, boolean create)
throws TargetResolutionException;
}
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