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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.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.InstanceContext;
import org.apache.tuscany.core.context.QualifiedName;
import org.apache.tuscany.core.context.EventContext;
import org.apache.tuscany.core.context.Context;
import org.apache.tuscany.core.context.ScopeContext;
import org.apache.tuscany.core.context.TargetException;
/**
* Implements functionality common to scope contexts.
* <p>
* <b>NB: </b>Minimal synchronization is performed, particularly for initializing and destroying scopes, and it is
* assumed the scope container will block requests until these operations have completed.
*
* @version $Rev$ $Date$
*/
public abstract class AbstractScopeContext extends AbstractContext implements ScopeContext{
// ----------------------------------
// Fields
// ----------------------------------
// The collection of runtime configurations for the scope
protected Map<String, RuntimeConfiguration<InstanceContext>> runtimeConfigurations = new ConcurrentHashMap();
// The event context the scope container is associated with
protected EventContext eventContext;
// ----------------------------------
// Constructors
// ----------------------------------
public AbstractScopeContext(EventContext eventContext) {
assert (eventContext != null) : "Event context was null";
this.eventContext = eventContext;
}
// ----------------------------------
// Lifecycle methods
// --------------------------_--------
public synchronized void start() {
}
public synchronized void stop() {
}
// ----------------------------------
// Scope methods
// ----------------------------------
public void registerConfigurations(List<RuntimeConfiguration<InstanceContext>> configurations) {
for (RuntimeConfiguration<InstanceContext> configuration : configurations) {
runtimeConfigurations.put(configuration.getName(), configuration);
}
}
public Object getInstance(QualifiedName qName) throws TargetException {
Object instance = null;
InstanceContext context = getContext(qName.getPartName());
if (context == null) {
TargetException e = new TargetException("Target not found");
e.setIdentifier(qName.getQualifiedName());
throw e;
}
return context.getInstance(qName);
}
public Object getInstance(QualifiedName qName, boolean notify) throws TargetException {
return getInstance(qName);
}
//----------------------------------
// InstanceContext methods
//----------------------------------
public Object getImplementationInstance() throws TargetException{
return this;
}
public Object getImplementationInstance(boolean notify) throws TargetException{
return this;
}
// ----------------------------------
// Protected methods
// ----------------------------------
protected EventContext getEventContext() {
return eventContext;
}
/**
* Notfies instances that are associated with a context and configured to receive callbacks that the context is
* being destroyed in reverse order
*
* @param key the context key
*/
protected void notifyInstanceShutdown(Object key) {
InstanceContext[] contexts = getShutdownContexts(key);
if ((contexts == null) || (contexts.length < 1)) {
return;
}
// shutdown destroyable instances in reverse instantiation order
for (int i = contexts.length - 1; i >= 0; i--) {
InstanceContext context = contexts[i];
if (context.getLifecycleState() == Context.RUNNING) {
synchronized (context) {
context.setLifecycleState(Context.STOPPING);
removeContextByKey(context.getName(), key);
try {
context.stop();
} catch (TargetException e) {
// TODO send a monitoring event
// log.error("Error releasing instance [" + context.getName() + "]",e);
}
}
}
}
}
protected void checkInit() {
if (lifecycleState != RUNNING) {
throw new IllegalStateException("Scope not running [" + lifecycleState + "]");
}
}
/**
* Returns an array of contexts that need to be notified of scope shutdown. The array must be in the order in which
* component contexts were created
*/
protected abstract InstanceContext[] getShutdownContexts(Object key);
}
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