/**
    * 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.regionserver;
  
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  
  @InterfaceAudience.Private
  public class MetricsUserAggregateFactory {
    private MetricsUserAggregateFactory() {
  
    }
    public static final String METRIC_USER_ENABLED_CONF = "hbase.regionserver.user.metrics.enabled";
    public static final boolean DEFAULT_METRIC_USER_ENABLED_CONF = true;
  
    public static MetricsUserAggregate getMetricsUserAggregate(Configuration conf) {
      if (conf.getBoolean(METRIC_USER_ENABLED_CONF, DEFAULT_METRIC_USER_ENABLED_CONF)) {
        return new MetricsUserAggregateImpl(conf);
      } else {
        //NoOpMetricUserAggregate
        return new MetricsUserAggregate() {
          @Override public void updatePut(long t) {
  
          }
  
          @Override public void updateDelete(long t) {
  
          }
  
          @Override public void updateGet(long t) {
  
          }
  
          @Override public void updateIncrement(long t) {
  
          }
  
          @Override public void updateAppend(long t) {
  
          }
  
          @Override public void updateReplay(long t) {
  
          }
  
          @Override public void updateScanTime(long t) {
  
          }
        };
      }
    }
  
  }