1 package org.apache.archiva.metadata.repository; 2 3 /* 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, 15 * software distributed under the License is distributed on an 16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 17 * KIND, either express or implied. See the License for the 18 * specific language governing permissions and limitations 19 * under the License. 20 */ 21 22 import java.util.concurrent.atomic.AtomicBoolean; 23 24 /** 25 * Implements just the open/close methods in a concurrent safe manner. 26 */ 27 public abstract class AbstractRepositorySessionFactory implements RepositorySessionFactory { 28 29 AtomicBoolean open = new AtomicBoolean(); 30 31 protected abstract void initialize(); 32 33 protected abstract void shutdown(); 34 35 @Override 36 public void open() { 37 if (open.compareAndSet(false,true)) { 38 initialize(); 39 } 40 } 41 42 @Override 43 public boolean isOpen() { 44 return open.get(); 45 } 46 47 @Override 48 public void close() { 49 if(open.compareAndSet(true,false)) { 50 shutdown(); 51 } 52 } 53 }