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This is the ehcache core module. Pair it with other modules for added functionality.

There is a newer version: 2.6.11

/**
 *  Copyright Terracotta, Inc.
 *
 *  Licensed 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 net.sf.ehcache.util.counter;

import java.io.Serializable;
import java.util.concurrent.atomic.AtomicLong;

/**
 * A simple counter implementation
 * 
 * @author Abhishek Sanoujam
 * @since 1.7
 * 
 */
public class CounterImpl implements Counter, Serializable {
    private AtomicLong value;

    /**
     * Default Constructor
     */
    public CounterImpl() {
        this(0L);
    }

    /**
     * Constructor with initial value
     * 
     * @param initialValue
     */
    public CounterImpl(long initialValue) {
        this.value = new AtomicLong(initialValue);
    }

    /**
     * {@inheritDoc}
     */
    public long increment() {
        return value.incrementAndGet();
    }

    /**
     * {@inheritDoc}
     */
    public long decrement() {
        return value.decrementAndGet();
    }

    /**
     * {@inheritDoc}
     */
    public long getAndSet(long newValue) {
        return value.getAndSet(newValue);
    }

    /**
     * {@inheritDoc}
     */
    public long getValue() {
        return value.get();
    }

    /**
     * {@inheritDoc}
     */
    public long increment(long amount) {
        return value.addAndGet(amount);
    }

    /**
     * {@inheritDoc}
     */
    public long decrement(long amount) {
        return value.addAndGet(amount * -1);
    }

    /**
     * {@inheritDoc}
     */
    public void setValue(long newValue) {
        value.set(newValue);
    }

}