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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* Licensed 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.context.scope;
import org.apache.tuscany.core.builder.ContextFactory;
import org.apache.tuscany.core.context.AtomicContext;
import org.apache.tuscany.core.context.Context;
import org.apache.tuscany.core.context.CoreRuntimeException;
import org.apache.tuscany.core.context.EventContext;
import org.apache.tuscany.core.context.TargetException;
import org.apache.tuscany.core.context.Lifecycle;
import org.apache.tuscany.core.context.event.InstanceCreated;
import org.apache.tuscany.core.context.event.Event;
import org.apache.tuscany.core.context.event.ModuleStart;
import org.apache.tuscany.core.context.event.ModuleStop;
import java.util.Map;
import java.util.List;
import java.util.ArrayList;
import java.util.ListIterator;
import java.util.concurrent.ConcurrentHashMap;
/**
* Manages contexts whose implementations are module scoped. This scope contexts eagerly starts contexts when
* a {@link ModuleStart} event is received. If a contained context has an implementation marked to eagerly initialized,
* the an instance will be created at that time as well. Contained contexts are shutdown when a {@link ModuleStop}
* event is received in reverse order to which their implementation instances were created.
*
* @version $Rev$ $Date$
*/
public class ModuleScopeContext extends AbstractScopeContext {
// Component contexts in this scope keyed by name
private Map<String, Context> contexts;
// the queue of contexts to destroy, in the order that their instances were created
private List<Context> destroyQueue;
public ModuleScopeContext(EventContext eventContext) {
super(eventContext);
setName("Module Scope");
}
public void onEvent(Event event) {
if (event instanceof ModuleStart) {
lifecycleState = RUNNING;
initComponentContexts();
} else if (event instanceof ModuleStop) {
shutdownContexts();
} else if (event instanceof InstanceCreated) {
checkInit();
if (event.getSource() instanceof Context) {
Context context = (Context) event.getSource();
// Queue the context to have its implementation instance released if destroyable
destroyQueue.add(context);
}
}
}
public synchronized void start() {
if (lifecycleState != UNINITIALIZED) {
throw new IllegalStateException("Scope must be in UNINITIALIZED state [" + lifecycleState + "]");
}
}
public synchronized void stop() {
if (lifecycleState != RUNNING) {
throw new IllegalStateException("Scope in wrong state [" + lifecycleState + "]");
}
contexts = null;
destroyQueue = null;
lifecycleState = STOPPED;
}
public boolean isCacheable() {
return true;
}
public void registerFactory(ContextFactory<Context> configuration) {
contextFactories.put(configuration.getName(), configuration);
if (lifecycleState == RUNNING) {
contexts.put(configuration.getName(), configuration.createContext());
}
}
public Context getContext(String ctxName) {
checkInit();
initComponentContexts();
return contexts.get(ctxName);
}
public Context getContextByKey(String ctxName, Object key) {
checkInit();
initComponentContexts();
return contexts.get(ctxName);
}
public void removeContext(String ctxName) {
checkInit();
if (contexts == null){
return;
}
Context context = contexts.remove(ctxName);
if (context != null) {
destroyQueue.remove(context);
}
}
public void removeContextByKey(String ctxName, Object key){
removeContext(ctxName);
}
/**
* Notifies contexts of a shutdown in reverse order to which they were started
*/
private synchronized void shutdownContexts() {
if (destroyQueue == null || destroyQueue.size() == 0) {
return;
}
// shutdown destroyable instances in reverse instantiation order
ListIterator<Context> iter = destroyQueue.listIterator(destroyQueue.size());
while(iter.hasPrevious()){
Lifecycle context = iter.previous();
if (context.getLifecycleState() == RUNNING) {
try {
if (context instanceof AtomicContext){
((AtomicContext)context).destroy();
}
} catch (TargetException e) {
// TODO send a monitoring event
}
}
}
if (contexts == null){
return;
}
for(Lifecycle context: contexts.values()) {
try {
if (context.getLifecycleState() == RUNNING) {
context.stop();
}
} catch (CoreRuntimeException e){
// TODO send monitoring event
}
}
contexts = null;
destroyQueue = null;
}
/**
* Creates and starts components contexts in the module scope. Implementations marked to eagerly initialize will
* also be notified to do so.
*
* @throws CoreRuntimeException
*/
private synchronized void initComponentContexts() throws CoreRuntimeException {
if (contexts == null) {
contexts = new ConcurrentHashMap<String, Context>();
destroyQueue = new ArrayList<Context>();
for (ContextFactory<Context> config : contextFactories.values()) {
Context context = config.createContext();
context.start();
contexts.put(context.getName(), context);
}
// Initialize eager contexts. Note this cannot be done when we initially create each context since a component may
// contain a forward reference to a component which has not been instantiated
for (Context context : contexts.values()) {
if (context instanceof AtomicContext) {
AtomicContext atomic = (AtomicContext) context;
if (atomic.isEagerInit()) {
// perform silent creation and manual shutdown registration
atomic.init();
destroyQueue.add(context);
}
}
context.addListener(this);
}
}
}
}
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