log4j-core/src/main/java/org/apache/logging/log4j/core/appender/nosql/AbstractNoSqlConnection.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache license, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the license for the specific language governing permissions and
 * limitations under the license.
 */

package org.apache.logging.log4j.core.appender.nosql;

import java.util.concurrent.atomic.AtomicBoolean;

/**
 * Facilitates implementations of {@link NoSqlConnection}.
 *
 * @param <W>
 *            See {@link NoSqlConnection}.
 * @param <T>
 *            See {@link NoSqlConnection}.
 */
public abstract class AbstractNoSqlConnection<W, T extends NoSqlObject<W>> implements NoSqlConnection<W, T> {

    private final AtomicBoolean closed = new AtomicBoolean(false);

    @Override
    public void close() {
        if (this.closed.compareAndSet(false, true)) {
            closeImpl();
        }
    }

    protected abstract void closeImpl();

    @Override
    public boolean isClosed() {
        return this.closed.get();
    }

}