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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.ArrayList;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.tuscany.spi.component.AtomicComponent;
import org.apache.tuscany.spi.component.ScopeContainerMonitor;
import org.apache.tuscany.spi.component.TargetDestructionException;
import org.apache.tuscany.spi.component.TargetResolutionException;
import org.apache.tuscany.spi.component.WorkContext;
import org.apache.tuscany.spi.component.InstanceWrapper;
import org.apache.tuscany.spi.event.Event;
import org.apache.tuscany.spi.model.Scope;
import org.apache.tuscany.core.component.event.HttpSessionEnd;
/**
* A scope context which manages atomic component instances keyed on HTTP session
*
* @version $Rev$ $Date$
*/
public class HttpSessionScopeContainer extends AbstractScopeContainer {
private final WorkContext workContext;
private final Map<AtomicComponent, Map<Object, InstanceWrapper>> contexts;
private final Map<Object, List<InstanceWrapper>> destroyQueues;
public HttpSessionScopeContainer(WorkContext workContext, ScopeContainerMonitor monitor) {
super(Scope.SESSION, monitor);
this.workContext = workContext;
contexts = new ConcurrentHashMap<AtomicComponent, Map<Object, InstanceWrapper>>();
destroyQueues = new ConcurrentHashMap<Object, List<InstanceWrapper>>();
}
public void onEvent(Event event) {
checkInit();
if (event instanceof HttpSessionEnd) {
Object key = ((HttpSessionEnd) event).getId();
shutdownInstances(key);
workContext.clearIdentifier(key);
}
}
public synchronized void start() {
if (lifecycleState != UNINITIALIZED && lifecycleState != STOPPED) {
throw new IllegalStateException("Scope must be in UNINITIALIZED or STOPPED state [" + lifecycleState + "]");
}
lifecycleState = RUNNING;
}
public synchronized void stop() {
contexts.clear();
synchronized (destroyQueues) {
destroyQueues.clear();
}
lifecycleState = STOPPED;
}
public void register(AtomicComponent component, Object groupId) {
contexts.put(component, new ConcurrentHashMap<Object, InstanceWrapper>());
component.addListener(this);
}
public void unregister(AtomicComponent component) {
// FIXME should all the instances associated with this component be destroyed already
contexts.remove(component);
component.removeListener(this);
super.unregister(component);
}
protected InstanceWrapper getInstanceWrapper(AtomicComponent component, boolean create)
throws TargetResolutionException {
Object key = workContext.getIdentifier(Scope.SESSION);
assert key != null : "HTTP session key not bound in work context";
return getInstance(component, key, create);
}
private InstanceWrapper getInstance(AtomicComponent component, Object key, boolean create)
throws TargetResolutionException {
Map<Object, InstanceWrapper> wrappers = contexts.get(component);
InstanceWrapper ctx = wrappers.get(key);
if (ctx == null && !create) {
return null;
}
if (ctx == null) {
ctx = component.createInstanceWrapper();
ctx.start();
wrappers.put(key, ctx);
List<InstanceWrapper> destroyQueue = destroyQueues.get(key);
if (destroyQueue == null) {
destroyQueue = new ArrayList<InstanceWrapper>();
destroyQueues.put(key, destroyQueue);
}
synchronized (destroyQueue) {
destroyQueue.add(ctx);
}
}
return ctx;
}
private void shutdownInstances(Object key) {
List<InstanceWrapper> destroyQueue = destroyQueues.remove(key);
if (destroyQueue != null) {
for (Map<Object, InstanceWrapper> map : contexts.values()) {
map.remove(key);
}
ListIterator<InstanceWrapper> iter = destroyQueue.listIterator(destroyQueue.size());
synchronized (destroyQueue) {
while (iter.hasPrevious()) {
try {
iter.previous().stop();
} catch (TargetDestructionException e) {
monitor.destructionError(e);
}
}
}
}
}
}
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