org.hbase.async.Counter Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of asynchbase Show documentation

An alternative HBase client library for applications requiring fully asynchronous, non-blocking and thread-safe HBase connectivity.

There is a newer version: 1.8.2

Show newest version

/*
 * Copyright (C) 2012  The Async HBase Authors.  All rights reserved.
 * This file is part of Async HBase.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *   - Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *   - Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *   - Neither the name of the StumbleUpon nor the names of its contributors
 *     may be used to endorse or promote products derived from this software
 *     without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package org.hbase.async;

import org.hbase.async.jsr166e.LongAdder;

/**
 * An atomic counter to replace {@link java.util.concurrent.atomic.AtomicLong}.
 * 
 * This is based on JSR 166e's sharded counter, which is slated for JDK8.
 * This class is part of the public interface of asynchbase, and code
 * depending on asynchbase is encouraged to use it for their concurrent
 * counter needs.
 * @since 1.3
 */
public final class Counter extends LongAdder {

  /**
   * Returns the current value of the counter.
   */
  public final long get() {
    return super.sum();
  }

  private static final long serialVersionUID = 1333661542;

}