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Server functionality for HBase

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/*
 * 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.hadoop.hbase.io;

import com.google.errorprone.annotations.RestrictedApi;
import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
import org.apache.hadoop.hbase.regionserver.MetricsRegionServerSourceFactory;
import org.apache.yetus.audience.InterfaceAudience;

@InterfaceAudience.Private
public class MetricsIO {

  private static volatile MetricsIO instance;
  private final MetricsIOSource source;
  private final MetricsIOWrapper wrapper;

  @RestrictedApi(explanation = "Should only be called in TestMetricsIO", link = "",
      allowedOnPath = ".*/(MetricsIO|TestMetricsIO).java")
  MetricsIO(MetricsIOWrapper wrapper) {
    this(CompatibilitySingletonFactory.getInstance(MetricsRegionServerSourceFactory.class)
      .createIO(wrapper), wrapper);
  }

  MetricsIO(MetricsIOSource source, MetricsIOWrapper wrapper) {
    this.source = source;
    this.wrapper = wrapper;
  }

  /**
   * Get a static instance for the MetricsIO so that accessors access the same instance. We want to
   * lazy initialize so that correct process name is in place. See HBASE-27966 for more details.
   */
  public static MetricsIO getInstance() {
    if (instance == null) {
      synchronized (MetricsIO.class) {
        if (instance == null) {
          instance = new MetricsIO(new MetricsIOWrapperImpl());
        }
      }
    }
    return instance;
  }

  public MetricsIOSource getMetricsSource() {
    return source;
  }

  public MetricsIOWrapper getWrapper() {
    return wrapper;
  }

  public void updateFsReadTime(long t) {
    source.updateFsReadTime(t);
  }

  public void updateFsPreadTime(long t) {
    source.updateFsPReadTime(t);
  }

  public void updateFsWriteTime(long t) {
    source.updateFsWriteTime(t);
  }
}