Source code

001package org.apache.archiva.metadata.repository;
002
003/*
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements.  See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership.  The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License.  You may obtain a copy of the License at
011 *
012 * http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing,
015 * software distributed under the License is distributed on an
016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017 * KIND, either express or implied.  See the License for the
018 * specific language governing permissions and limitations
019 * under the License.
020 */
021
022import java.util.concurrent.atomic.AtomicBoolean;
023
024/**
025 * Implements just the open/close methods in a concurrent safe manner.
026 */
027public abstract class AbstractRepositorySessionFactory implements RepositorySessionFactory {
028
029    AtomicBoolean open = new AtomicBoolean();
030
031    protected abstract void initialize();
032
033    protected abstract void shutdown();
034
035    @Override
036    public void open() {
037        if (open.compareAndSet(false,true)) {
038            initialize();
039        }
040    }
041
042    @Override
043    public boolean isOpen() {
044        return open.get();
045    }
046
047    @Override
048    public void close() {
049        if(open.compareAndSet(true,false)) {
050            shutdown();
051        }
052    }
053}