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Common utilities shared in Alluxio core modules

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/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.metrics.sink;

import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.jmx.JmxReporter;

import java.util.Properties;
import javax.annotation.concurrent.ThreadSafe;

/**
 * A sink which listens for new metrics and exposes them as namespaces MBeans.
 */
@ThreadSafe
public final class JmxSink implements Sink {
  private static final String DOMAIN = "org.alluxio";

  private JmxReporter mReporter;

  /**
   * Creates a new {@link JmxSink} with a {@link Properties} and {@link MetricRegistry}.
   *
   * @param properties the properties
   * @param registry the metric registry to register
   */
  public JmxSink(Properties properties, MetricRegistry registry) {
    JmxReporter.Builder builder = JmxReporter.forRegistry(registry);
    String domain = properties.getProperty("domain");
    if (domain != null) {
      builder.inDomain(domain);
    } else {
      builder.inDomain(DOMAIN);
    }
    mReporter = builder.build();
  }

  @Override
  public void start() {
    mReporter.start();
  }

  @Override
  public void stop() {
    mReporter.stop();
  }

  @Override
  public void report() {
  }
}