| /* |
| * 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.felix.scr.impl.manager; |
| |
| import java.util.AbstractMap.SimpleImmutableEntry; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| import org.apache.felix.scr.impl.inject.ScrComponentContext; |
| import org.osgi.framework.ServiceReference; |
| |
| /** |
| * @version $Rev$ $Date$ |
| */ |
| public class SinglePrototypeRefPair<S, T> extends AbstractPrototypeRefPair<S, T> |
| { |
| private final AtomicReference<SimpleImmutableEntry<ScrComponentContext, T>> instance = new AtomicReference<>(); |
| |
| public SinglePrototypeRefPair( ServiceReference<T> ref ) |
| { |
| super(ref); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "[SinglePrototypeRefPair: ref: [" + getRef() + "] service: [" + getServiceObject(null) + "]]"; |
| } |
| |
| @Override |
| public T getServiceObject(ScrComponentContext key) { |
| return internalGetServiceObject(key, false); |
| } |
| |
| @Override |
| public boolean setServiceObject(ScrComponentContext key, T serviceObject) { |
| return instance.compareAndSet(null, new SimpleImmutableEntry<>(key, serviceObject)); |
| } |
| |
| @Override |
| protected T remove(ScrComponentContext key) { |
| return internalGetServiceObject(key, true); |
| } |
| |
| private T internalGetServiceObject(ScrComponentContext key, boolean remove) { |
| SimpleImmutableEntry<ScrComponentContext, T> entry = instance.get(); |
| if (entry == null) { |
| return null; |
| } |
| T result = key == null || entry.getKey().equals(key) ? entry.getValue() : null; |
| if (remove && result != null) { |
| instance.compareAndSet(entry, null); |
| } |
| return result; |
| } |
| |
| @Override |
| protected Collection<Entry<ScrComponentContext, T>> clearEntries() { |
| Map.Entry<ScrComponentContext, T> entry = instance.getAndSet(null); |
| return entry == null ? Collections.<Entry<ScrComponentContext, T>>emptyList() : Collections.singleton(entry); |
| } |
| |
| } |