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}