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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 java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.tuscany.core.builder.ContextFactory;
import org.apache.tuscany.core.context.CompositeContext;
import org.apache.tuscany.core.context.Context;
import org.apache.tuscany.core.context.EventContext;
import org.apache.tuscany.core.context.QualifiedName;
import org.apache.tuscany.core.context.ScopeContext;
import org.apache.tuscany.core.context.ScopeInitializationException;
import org.apache.tuscany.core.context.ScopeRuntimeException;
import org.apache.tuscany.core.context.TargetException;
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 org.apache.tuscany.core.context.impl.AbstractLifecycle;
/**
* Manages the lifecycle of composite component contexts, i.e. contexts which contain child contexts
*
* @see org.apache.tuscany.core.context.CompositeContext
* @version $Rev$ $Date$
*/
public class CompositeScopeContext extends AbstractLifecycle implements ScopeContext {
private List<ContextFactory<Context>> configs = new ArrayList<ContextFactory<Context>>();
// Composite component contexts in this scope keyed by name
private Map<String, CompositeContext> contexts = new ConcurrentHashMap<String, CompositeContext>();
// indicates if a module start event has been previously propagated so child contexts added after can be notified
private boolean moduleScopeStarted;
public CompositeScopeContext(EventContext eventContext) {
assert (eventContext != null) : "Event context was null";
setName("Composite Scope");
}
public void start() throws ScopeInitializationException {
for (ContextFactory<Context> configuration : configs) {
Context context = configuration.createContext();
if (!(context instanceof CompositeContext)) {
ScopeInitializationException e = new ScopeInitializationException("Context not an composite type");
e.addContextName(context.getName());
throw e;
}
CompositeContext compositeCtx = (CompositeContext) context;
compositeCtx.start();
contexts.put(compositeCtx.getName(), compositeCtx);
}
lifecycleState = RUNNING;
}
public void stop() throws ScopeRuntimeException {
for (CompositeContext context : contexts.values()) {
context.stop();
}
}
public void registerFactories(List<ContextFactory<Context>> configurations) {
this.configs = configurations;
}
public void registerFactory(ContextFactory<Context> configuration) {
assert (configuration != null) : "Configuration was null";
configs.add(configuration);
if (getLifecycleState() == RUNNING) {
Context context = configuration.createContext();
if (!(context instanceof CompositeContext)) {
ScopeInitializationException e = new ScopeInitializationException("Context not an composite type");
e.setIdentifier(context.getName());
throw e;
}
CompositeContext compositeCtx = (CompositeContext) context;
compositeCtx.start();
if (moduleScopeStarted) {
compositeCtx.publish(new ModuleStart(this));
}
contexts.put(compositeCtx.getName(), compositeCtx);
}
}
public boolean isCacheable() {
return false;
}
public Object getInstance(QualifiedName qName) throws TargetException {
Context context = getContext(qName.getPartName());
if (context == null) {
TargetException e = new TargetException("Component not found");
e.setIdentifier(qName.getQualifiedName());
throw e;
}
return context.getInstance(qName);
}
public Context getContext(String ctxName) {
checkInit();
return contexts.get(ctxName);
}
public Context getContextByKey(String ctxName, Object key) {
return getContext(ctxName);
}
public void removeContext(String ctxName) throws ScopeRuntimeException {
Context context = contexts.remove(ctxName);
if (context != null) {
context.stop();
}
}
public void removeContextByKey(String ctxName, Object key) throws ScopeRuntimeException {
throw new UnsupportedOperationException();
}
public void onEvent(Event event){
if (event instanceof ModuleStart) {
// track module starting so that composite contexts registered after the event are notified properly
moduleScopeStarted = true;
} else if (event instanceof ModuleStop) {
moduleScopeStarted = false;
publish(event);
}
// propagate events to child contexts
for (CompositeContext context : contexts.values()) {
context.publish(event);
}
}
private void checkInit() {
if (getLifecycleState()!= RUNNING) {
throw new IllegalStateException("Scope not running [" + getLifecycleState() + "]");
}
}
}
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