/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.aries.util.service.registry;
import java.security.AccessController;
import java.security.PrivilegedAction;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
// TODO need to determine if this needs to be thread safe or not
public class ServicePair<T>
{
private BundleContext ctx;
private ServiceReference ref;
private T serviceObject;
public ServicePair(BundleContext context, ServiceReference serviceRef)
{
ctx = context;
ref = serviceRef;
}
public ServicePair(BundleContext context, ServiceReference serviceRef, T service)
{
ctx = context;
ref = serviceRef;
serviceObject = service;
}
@SuppressWarnings("unchecked")
public T get()
{
if (serviceObject == null && ref.getBundle() != null) {
serviceObject = AccessController.doPrivileged(new PrivilegedAction<T>() {
public T run()
{
return serviceObject = (T) ctx.getService(ref);
}
});
}
return serviceObject;
}
public boolean isValid() {
return (ref.getBundle() != null);
}
public void unget()
{
if (serviceObject != null) {
ctx.ungetService(ref);
serviceObject = null;
}
}
public ServiceReference getReference()
{
return ref;
}
}