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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.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);
  }
}