/**
    * 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.thrift;
  
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.metrics.BaseSourceImpl;
  import org.apache.hadoop.hbase.metrics.ExceptionTrackingSourceImpl;
  import org.apache.hadoop.metrics2.MetricHistogram;
  import org.apache.hadoop.metrics2.lib.MutableFastCounter;
  import org.apache.hadoop.metrics2.lib.MutableGaugeLong;
  import org.apache.hadoop.metrics2.lib.MutableHistogram;
  
  /**
   * Hadoop 2 version of MetricsThriftServerSource{@link org.apache.hadoop.hbase.thrift.MetricsThriftServerSource}
   *
   * Implements BaseSource through BaseSourceImpl, following the pattern
   */
  @InterfaceAudience.Private
  public class MetricsThriftServerSourceImpl extends ExceptionTrackingSourceImpl implements
      MetricsThriftServerSource {
  
    private MetricHistogram batchGetStat;
    private MetricHistogram batchMutateStat;
    private MetricHistogram queueTimeStat;
  
    private MetricHistogram thriftCallStat;
    private MetricHistogram thriftSlowCallStat;
  
    private MutableGaugeLong callQueueLenGauge;
  
    // pause monitor metrics
    private final MutableFastCounter infoPauseThresholdExceeded;
    private final MutableFastCounter warnPauseThresholdExceeded;
    private final MetricHistogram pausesWithGc;
    private final MetricHistogram pausesWithoutGc;
  
    private MutableGaugeLong activeWorkerCountGauge;
  
    public MetricsThriftServerSourceImpl(String metricsName,
                                         String metricsDescription,
                                         String metricsContext,
                                         String metricsJmxContext) {
      super(metricsName, metricsDescription, metricsContext, metricsJmxContext);
  
      // pause monitor metrics
      infoPauseThresholdExceeded = getMetricsRegistry().newCounter(INFO_THRESHOLD_COUNT_KEY,
        INFO_THRESHOLD_COUNT_DESC, 0L);
      warnPauseThresholdExceeded = getMetricsRegistry().newCounter(WARN_THRESHOLD_COUNT_KEY,
        WARN_THRESHOLD_COUNT_DESC, 0L);
      pausesWithGc = getMetricsRegistry().newTimeHistogram(PAUSE_TIME_WITH_GC_KEY);
      pausesWithoutGc = getMetricsRegistry().newTimeHistogram(PAUSE_TIME_WITHOUT_GC_KEY);
    }
  
    @Override
    public void init() {
      super.init();
      batchGetStat = getMetricsRegistry().newTimeHistogram(BATCH_GET_KEY);
      batchMutateStat = getMetricsRegistry().newTimeHistogram(BATCH_MUTATE_KEY);
      queueTimeStat = getMetricsRegistry().newTimeHistogram(TIME_IN_QUEUE_KEY);
      thriftCallStat = getMetricsRegistry().newTimeHistogram(THRIFT_CALL_KEY);
      thriftSlowCallStat = getMetricsRegistry().newTimeHistogram(SLOW_THRIFT_CALL_KEY);
      callQueueLenGauge = getMetricsRegistry().getGauge(CALL_QUEUE_LEN_KEY, 0);
      activeWorkerCountGauge = getMetricsRegistry().getGauge(ACTIVE_WORKER_COUNT_KEY, 0);
    }
  
    @Override
    public void incTimeInQueue(long time) {
      queueTimeStat.add(time);
    }
  
    @Override
    public void setCallQueueLen(int len) {
      callQueueLenGauge.set(len);
    }
  
    @Override
    public void incNumRowKeysInBatchGet(int diff) {
      batchGetStat.add(diff);
    }
  
    @Override
    public void incNumRowKeysInBatchMutate(int diff) {
      batchMutateStat.add(diff);
   }
 
   @Override
   public void incMethodTime(String name, long time) {
     MutableHistogram s = getMetricsRegistry().getHistogram(name);
     s.add(time);
   }
 
   @Override
   public void incCall(long time) {
     thriftCallStat.add(time);
   }
 
   @Override
   public void incSlowCall(long time) {
     thriftSlowCallStat.add(time);
   }
 
   public void incActiveWorkerCount() {
     activeWorkerCountGauge.incr();
   }
 
   @Override
   public void decActiveWorkerCount() {
     activeWorkerCountGauge.decr();
   }
 
   @Override
   public void incInfoThresholdExceeded(int count) {
     infoPauseThresholdExceeded.incr(count);
   }
 
   @Override
   public void incWarnThresholdExceeded(int count) {
     warnPauseThresholdExceeded.incr(count);
   }
 
   @Override
   public void updatePauseTimeWithGc(long t) {
     pausesWithGc.add(t);
   }
 
   @Override
   public void updatePauseTimeWithoutGc(long t) {
     pausesWithoutGc.add(t);
   }
 }