/**
    * 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.rest;
  
  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.MutableFastCounter;
  
  /**
   * Hadoop Two implementation of a metrics2 source that will export metrics from the Rest server to
   * the hadoop metrics2 subsystem.
   *
   * Implements BaseSource through BaseSourceImpl, following the pattern
   */
  @InterfaceAudience.Private
  public class MetricsRESTSourceImpl extends BaseSourceImpl implements MetricsRESTSource {
  
    private MutableFastCounter request;
    private MutableFastCounter sucGet;
    private MutableFastCounter sucPut;
    private MutableFastCounter sucDel;
    private MutableFastCounter sucScan;
    private MutableFastCounter sucAppend;
    private MutableFastCounter sucIncrement;
    private MutableFastCounter fGet;
    private MutableFastCounter fPut;
    private MutableFastCounter fDel;
    private MutableFastCounter fScan;
    private MutableFastCounter fAppend;
    private MutableFastCounter fIncrement;
  
    // pause monitor metrics
    private final MutableFastCounter infoPauseThresholdExceeded;
    private final MutableFastCounter warnPauseThresholdExceeded;
    private final MetricHistogram pausesWithGc;
    private final MetricHistogram pausesWithoutGc;
  
    public MetricsRESTSourceImpl() {
      this(METRICS_NAME, METRICS_DESCRIPTION, CONTEXT, JMX_CONTEXT);
    }
  
    public MetricsRESTSourceImpl(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();
      request = getMetricsRegistry().getCounter(REQUEST_KEY, 0l);
  
      sucGet = getMetricsRegistry().getCounter(SUCCESSFUL_GET_KEY, 0l);
      sucPut = getMetricsRegistry().getCounter(SUCCESSFUL_PUT_KEY, 0l);
      sucDel = getMetricsRegistry().getCounter(SUCCESSFUL_DELETE_KEY, 0l);
      sucScan = getMetricsRegistry().getCounter(SUCCESSFUL_SCAN_KEY, 0L);
      sucAppend = getMetricsRegistry().getCounter(SUCCESSFUL_APPEND_KEY, 0l);
      sucIncrement = getMetricsRegistry().getCounter(SUCCESSFUL_INCREMENT_KEY, 0L);
  
      fGet = getMetricsRegistry().getCounter(FAILED_GET_KEY, 0l);
      fPut = getMetricsRegistry().getCounter(FAILED_PUT_KEY, 0l);
      fDel = getMetricsRegistry().getCounter(FAILED_DELETE_KEY, 0l);
      fScan = getMetricsRegistry().getCounter(FAILED_SCAN_KEY, 0l);
      fAppend = getMetricsRegistry().getCounter(FAILED_APPEND_KEY, 0l);
      fIncrement = getMetricsRegistry().getCounter(FAILED_INCREMENT_KEY, 0L);
    }
  
    @Override
    public void incrementRequests(int inc) {
      request.incr(inc);
    }
  
    @Override
   public void incrementSucessfulGetRequests(int inc) {
     sucGet.incr(inc);
   }
 
   @Override
   public void incrementSucessfulPutRequests(int inc) {
     sucPut.incr(inc);
   }
 
   @Override
   public void incrementSucessfulDeleteRequests(int inc) {
     sucDel.incr(inc);
   }
 
   @Override
   public void incrementFailedGetRequests(int inc) {
     fGet.incr(inc);
   }
 
   @Override
   public void incrementFailedPutRequests(int inc) {
     fPut.incr(inc);
   }
 
   @Override
   public void incrementFailedDeleteRequests(int inc) {
     fDel.incr(inc);
   }
 
   @Override
   public void incrementSucessfulScanRequests(int inc) {
     sucScan.incr(inc);
   }
 
   @Override
   public void incrementFailedScanRequests(int inc) {
    fScan.incr(inc);
   }
 
   @Override
   public void incrementSucessfulAppendRequests(int inc) {
     sucAppend.incr(inc);
   }
 
   @Override
   public void incrementFailedAppendRequests(int inc) {
     fAppend.incr(inc);
   }
 
   @Override
   public void incrementSucessfulIncrementRequests(int inc) {
     sucIncrement.incr(inc);
   }
 
   @Override
   public void incrementFailedIncrementRequests(int inc) {
     fIncrement.incr(inc);
   }
 
   @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);
   }
 }