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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.RuntimeConfiguration;
import org.apache.tuscany.core.context.AbstractContext;
import org.apache.tuscany.core.context.AggregateContext;
import org.apache.tuscany.core.context.EventContext;
import org.apache.tuscany.core.context.EventException;
import org.apache.tuscany.core.context.InstanceContext;
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;
/**
* Manages the lifecycle of aggregate component contexts, i.e. contexts which contain child contexts
*
* @see org.apache.tuscany.core.context.AggregateContext
* @version $Rev$ $Date$
*/
public class AggregateScopeContext extends AbstractContext implements ScopeContext {
// ----------------------------------
// Fields
// ----------------------------------
private EventContext eventContext;
private List<RuntimeConfiguration<InstanceContext>> configs = new ArrayList();
// Aggregate component contexts in this scope keyed by name
private Map<String, AggregateContext> contexts = new ConcurrentHashMap();
// indicates if a module start event has been previously propagated so child contexts added after can be notified
private boolean moduleScopeStarted;
// ----------------------------------
// Constructors
// ----------------------------------
public AggregateScopeContext(EventContext eventContext) {
assert (eventContext != null) : "Event context was null";
this.eventContext = eventContext;
name = "Aggregate Scope";
}
// ----------------------------------
// Lifecycle methods
// ----------------------------------
public void start() throws ScopeInitializationException {
for (RuntimeConfiguration<InstanceContext> configuration : configs) {
InstanceContext context = configuration.createInstanceContext();
if (!(context instanceof AggregateContext)) {
ScopeInitializationException e = new ScopeInitializationException("Context not an aggregate type");
e.addContextName(context.getName());
throw e;
}
AggregateContext aggregateCtx = (AggregateContext) context;
aggregateCtx.start();
contexts.put(aggregateCtx.getName(), aggregateCtx);
}
lifecycleState = RUNNING;
}
public void stop() throws ScopeRuntimeException {
for (AggregateContext context : contexts.values()) {
context.stop();
}
}
// ----------------------------------
// Methods
// ----------------------------------
public void registerConfigurations(List<RuntimeConfiguration<InstanceContext>> configurations) {
this.configs = configurations;
}
public void registerConfiguration(RuntimeConfiguration<InstanceContext> configuration) {
assert (configuration != null) : "Configuration was null";
configs.add(configuration);
if (lifecycleState == RUNNING) {
InstanceContext context = configuration.createInstanceContext();
if (!(context instanceof AggregateContext)) {
ScopeInitializationException e = new ScopeInitializationException("Context not an aggregate type");
e.setIdentifier(context.getName());
throw e;
}
AggregateContext aggregateCtx = (AggregateContext) context;
aggregateCtx.start();
if (moduleScopeStarted) {
aggregateCtx.fireEvent(EventContext.MODULE_START, null);
}
contexts.put(aggregateCtx.getName(), aggregateCtx);
}
}
public boolean isCacheable() {
return false;
}
public Object getInstance(QualifiedName qName) throws TargetException {
Object instance = null;
InstanceContext 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 Object getInstance(QualifiedName qName, boolean notify) throws TargetException {
return getInstance(qName);
}
public InstanceContext getContext(String ctxName) {
checkInit();
return contexts.get(ctxName);
}
public InstanceContext getContextByKey(String ctxName, Object key) {
return getContext(ctxName);
}
public void removeContext(String ctxName) throws ScopeRuntimeException {
InstanceContext context = contexts.remove(ctxName);
if (context != null) {
context.stop();
}
}
public void removeContextByKey(String ctxName, Object key) throws ScopeRuntimeException {
}
public void onEvent(int type, Object message) throws EventException {
if (type == EventContext.MODULE_START) {
// track module starting so that aggregate contexts registered after the event are notified properly
moduleScopeStarted = true;
} else if (type == EventContext.MODULE_STOP) {
moduleScopeStarted = false;
}
// propagate events to child contexts
for (AggregateContext context : contexts.values()) {
context.fireEvent(type, message);
}
}
public Object getImplementationInstance() throws TargetException{
return this;
}
public Object getImplementationInstance(boolean notify) throws TargetException{
return this;
}
private void checkInit() {
if (lifecycleState != RUNNING) {
throw new IllegalStateException("Scope not running [" + lifecycleState + "]");
}
}
}
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