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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.ObjectFactory;
import org.apache.tuscany.core.context.impl.AbstractContext;
import org.apache.tuscany.core.context.ExternalServiceContext;
import org.apache.tuscany.core.context.QualifiedName;
import org.apache.tuscany.core.context.TargetException;
/**
* An implementation of an external service for system wiring. As system components are not proxied and the system
* binding is by-reference, the implementation caches a reference to its configured target.
*
* @version $Rev$ $Date$
*/
public class SystemExternalServiceContext extends AbstractContext implements ExternalServiceContext {
// a factory for retrieving the target of the external service wire
private ObjectFactory factory;
// the cached target
private Object cachedInstance;
public SystemExternalServiceContext(String name, ObjectFactory factory) {
super(name);
assert (factory != null) : "Object factory was null";
this.factory = factory;
}
public Object getInstance(QualifiedName qName) throws TargetException {
try {
if (cachedInstance == null) {
cachedInstance = factory.getInstance();
}
return cachedInstance;
} catch (TargetException e) {
e.addContextName(getName());
throw e;
}
}
public void start() {
lifecycleState = RUNNING;
}
public void stop() {
lifecycleState = STOPPED;
}
public Object getHandler() throws TargetException {
return this;
}
}
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