phoenix-core/src/main/java/org/apache/phoenix/monitoring/AtomicMetric.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.phoenix.monitoring;

import java.util.concurrent.atomic.AtomicLong;

/**
 * Version of {@link Metric} that can be used when the metric is being concurrently accessed or modified by multiple
 * threads.
 */
public class AtomicMetric implements Metric {

    private final MetricType type;
    private final AtomicLong value = new AtomicLong();

    public AtomicMetric(MetricType type) {
        this.type = type;
    }

    @Override
    public String getName() {
        return type.name();
    }

    @Override
    public String getDescription() {
        return type.description();
    }

    @Override
    public long getValue() {
        return value.get();
    }

    @Override
    public void change(long delta) {
        value.addAndGet(delta);
    }

    @Override
    public void increment() {
        value.incrementAndGet();
    }

    @Override
    public String getCurrentMetricState() {
        return getName() + ": " + value.get();
    }

    @Override
    public void reset() {
        value.set(0);
    }

    @Override
    public void decrement() {
        value.decrementAndGet();        
    }

}