/**
    * 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.wal;
  
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.metrics.BaseSourceImpl;
  import org.apache.hadoop.metrics2.MetricHistogram;
  import org.apache.hadoop.metrics2.lib.MutableCounterLong;
  
  
  /**
   * Class that transitions metrics from MetricsWAL into the metrics subsystem.
   *
   * Implements BaseSource through BaseSourceImpl, following the pattern.
   * @see org.apache.hadoop.hbase.regionserver.wal.MetricsWAL
   */
  @InterfaceAudience.Private
  public class MetricsWALSourceImpl extends BaseSourceImpl implements MetricsWALSource {
  
    private final MetricHistogram appendSizeHisto;
    private final MetricHistogram appendTimeHisto;
    private final MetricHistogram syncTimeHisto;
    private final MutableCounterLong appendCount;
    private final MutableCounterLong slowAppendCount;
    private final MutableCounterLong logRollRequested;
    private final MutableCounterLong lowReplicationLogRollRequested;
  
    public MetricsWALSourceImpl() {
      this(METRICS_NAME, METRICS_DESCRIPTION, METRICS_CONTEXT, METRICS_JMX_CONTEXT);
    }
  
    public MetricsWALSourceImpl(String metricsName,
                                String metricsDescription,
                                String metricsContext,
                                String metricsJmxContext) {
      super(metricsName, metricsDescription, metricsContext, metricsJmxContext);
  
      //Create and store the metrics that will be used.
      appendTimeHisto = this.getMetricsRegistry().newTimeHistogram(APPEND_TIME, APPEND_TIME_DESC);
      appendSizeHisto = this.getMetricsRegistry().newSizeHistogram(APPEND_SIZE, APPEND_SIZE_DESC);
      appendCount = this.getMetricsRegistry().newCounter(APPEND_COUNT, APPEND_COUNT_DESC, 0l);
      slowAppendCount =
          this.getMetricsRegistry().newCounter(SLOW_APPEND_COUNT, SLOW_APPEND_COUNT_DESC, 0l);
      syncTimeHisto = this.getMetricsRegistry().newTimeHistogram(SYNC_TIME, SYNC_TIME_DESC);
      logRollRequested =
          this.getMetricsRegistry().newCounter(ROLL_REQUESTED, ROLL_REQUESTED_DESC, 0L);
      lowReplicationLogRollRequested = this.getMetricsRegistry()
          .newCounter(LOW_REPLICA_ROLL_REQUESTED, LOW_REPLICA_ROLL_REQUESTED_DESC, 0L);
    }
  
    @Override
    public void incrementAppendSize(long size) {
      appendSizeHisto.add(size);
    }
  
    @Override
    public void incrementAppendTime(long time) {
      appendTimeHisto.add(time);
    }
  
    @Override
    public void incrementAppendCount() {
      appendCount.incr();
    }
  
    @Override
    public void incrementSlowAppendCount() {
      slowAppendCount.incr();
    }
  
    @Override
    public void incrementSyncTime(long time) {
      syncTimeHisto.add(time);
    }
  
    @Override
    public void incrementLogRollRequested() {
      logRollRequested.incr();
    }
  
    @Override
    public void incrementLowReplicationLogRoll() {
      lowReplicationLogRollRequested.incr();
   }
 }