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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.system.context;
import org.apache.tuscany.core.builder.ContextResolver;
import org.apache.tuscany.core.context.impl.AbstractContext;
import org.apache.tuscany.core.context.Context;
import org.apache.tuscany.core.context.CoreRuntimeException;
import org.apache.tuscany.core.context.EntryPointContext;
import org.apache.tuscany.core.context.QualifiedName;
import org.apache.tuscany.core.context.TargetException;
/**
* Manages an entry point into a system module. System entry points cache a direct (i.e. non-proxied) reference to a
* component instance.
*
* @version $Rev$ $Date$
*/
public class SystemEntryPointContext extends AbstractContext implements EntryPointContext {
// a reference to the component's implementation instance exposed by the entry point
private Object cachedInstance;
private ContextResolver resolver;
private QualifiedName targetName;
private Class serviceInterface;
public SystemEntryPointContext(String name, String targetName, Class serviceInterface, ContextResolver resolver) {
super(name);
assert (resolver != null) : "Context resolver was null";
assert (targetName != null) : "Target name was null";
assert (serviceInterface != null) : "Service interface is null";
this.serviceInterface = serviceInterface;
this.resolver = resolver;
this.targetName = new QualifiedName(targetName);
}
public Object getInstance(QualifiedName qName) throws TargetException {
try {
if (cachedInstance == null) {
Context ctx = resolver.getCurrentContext().getContext(targetName.getPartName());
if (ctx == null){
return null;
}
cachedInstance = ctx.getInstance(targetName);
}
return cachedInstance;
} catch (TargetException e) {
e.addContextName(getName());
throw e;
}
}
public void start() throws CoreRuntimeException {
lifecycleState = RUNNING;
}
public void stop() throws CoreRuntimeException {
lifecycleState = STOPPED;
}
public Object getHandler() throws TargetException {
return getInstance(null);
}
public Class getServiceInterface() {
return serviceInterface;
}
}
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