1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache license, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the license for the specific language governing permissions and 15 * limitations under the license. 16 */ 17 18 package org.apache.logging.log4j.nosql.appender; 19 20 import java.util.concurrent.atomic.AtomicBoolean; 21 22 /** 23 * Facilitates implementations of {@link NoSqlConnection}. 24 * 25 * @param <W> 26 * See {@link NoSqlConnection}. 27 * @param <T>See 28 * {@link NoSqlConnection}. 29 */ 30 public abstract class AbstractNoSqlConnection<W, T extends NoSqlObject<W>> implements NoSqlConnection<W, T> { 31 32 private final AtomicBoolean closed = new AtomicBoolean(false); 33 34 @Override 35 public void close() { 36 if (this.closed.compareAndSet(false, true)) { 37 closeImpl(); 38 } 39 } 40 41 protected abstract void closeImpl(); 42 43 @Override 44 public boolean isClosed() { 45 return this.closed.get(); 46 } 47 48 }