001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache license, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the license for the specific language governing permissions and 015 * limitations under the license. 016 */ 017 018package org.apache.logging.log4j.core.appender.nosql; 019 020import java.util.concurrent.atomic.AtomicBoolean; 021 022/** 023 * Facilitates implementations of {@link NoSqlConnection}. 024 * 025 * @param <W> 026 * See {@link NoSqlConnection}. 027 * @param <T> 028 * See {@link NoSqlConnection}. 029 */ 030public abstract class AbstractNoSqlConnection<W, T extends NoSqlObject<W>> implements NoSqlConnection<W, T> { 031 032 private final AtomicBoolean closed = new AtomicBoolean(false); 033 034 @Override 035 public void close() { 036 if (this.closed.compareAndSet(false, true)) { 037 closeImpl(); 038 } 039 } 040 041 protected abstract void closeImpl(); 042 043 @Override 044 public boolean isClosed() { 045 return this.closed.get(); 046 } 047 048}