/**
* 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 com.sun.jersey.core.osgi;
import java.util.concurrent.Callable;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.List;
import java.util.Map;
import java.util.HashMap;
import java.util.ArrayList;
public class OsgiLocator {
private static Map<String, List<Callable<List<Class>>>> factories = new HashMap<String, List<Callable<List<Class>>>>();
private static ReadWriteLock lock = new ReentrantReadWriteLock();
private OsgiLocator() {
}
public static void unregister(String id, Callable<List<Class>> factory) {
lock.writeLock().lock();
try {
List<Callable<List<Class>>> l = factories.get(id);
if (l != null) {
l.remove(factory);
}
} finally {
lock.writeLock().unlock();
}
}
public static void register(String id, Callable<List<Class>> factory) {
lock.writeLock().lock();
try {
List<Callable<List<Class>>> l = factories.get(id);
if (l == null) {
l = new ArrayList<Callable<List<Class>>>();
factories.put(id, l);
}
l.add(factory);
} finally {
lock.writeLock().unlock();
}
}
public static synchronized Class locate(String factoryId) {
lock.readLock().lock();
try {
List<Callable<List<Class>>> l = factories.get(factoryId);
if (l == null || l.isEmpty()) {
return null;
}
Callable<List<Class>> c = l.get(l.size() - 1);
List<Class> classes;
try {
classes = c.call();
} catch (Exception e) {
return null;
}
return classes.get(0);
} finally {
lock.readLock().unlock();
}
}
public static synchronized List<Class> locateAll(String factoryId) {
List<Class> classes = new ArrayList<Class>();
List<Callable<List<Class>>> l = factories.get(factoryId);
if (l == null) {
return classes;
}
for (Callable<List<Class>> c : l) {
try {
classes.addAll(c.call());
} catch (Exception e) {
}
}
return classes;
}
}