Metric.java

/* Copyright 2012 Google, 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 org.arbeitspferde.groningen.utility;

import com.google.common.util.concurrent.AtomicDouble;

import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;

/**
 * Wrap a value or value provided into a {@link MetricListener} for a {@link MetricExporter}.
 */
public class Metric {
  /**
   * Produce a {@link MetricListener} for a {@link AtomicLong} that exposes whatever its
   * underlying value is to the {@link MetricExporter}.
   */
  public static MetricListener<Long> make(final AtomicLong value) {
    return new MetricListener<Long>() {
      @Override
      public Long value() {
        return value.get();
      }
    };
  }

  public static MetricListener<Double> make(final AtomicDouble value) {
    return new MetricListener<Double>() {
      @Override
      public Double value() {
        return value.get();
      }
    };
  }

  public static MetricListener<Integer> make(final AtomicInteger value) {
    return new MetricListener<Integer>() {
      @Override
      public Integer value() {
        return value.get();
      }
    };
  }
}