code: /*
   * Copyright 2018 Mitsunori Komatsu (komamitsu)
   *
   * Licensed 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.komamitsu.fluency.fluentd.ingester.sender.failuredetect;
  
  import org.komamitsu.failuredetector.PhiAccuralFailureDetector;
  import org.komamitsu.fluency.validation.Validatable;
  import org.komamitsu.fluency.validation.annotation.DecimalMin;
  import org.komamitsu.fluency.validation.annotation.Min;
  
  public class PhiAccrualFailureDetectStrategy
          extends FailureDetectStrategy
  {
      private final PhiAccuralFailureDetector failureDetector;
      private final Config config;
  
      public PhiAccrualFailureDetectStrategy()
      {
          this(new Config());
      }
  
      public PhiAccrualFailureDetectStrategy(Config config)
      {
          super(config);
          config.validateValues();
          this.config = config;
          failureDetector = new PhiAccuralFailureDetector.Builder().
                  setThreshold(config.getPhiThreshold()).
                  setMaxSampleSize(config.getArrivalWindowSize()).
                  build();
      }
  
      @Override
      public void heartbeat(long now)
      {
          failureDetector.heartbeat(now);
      }
  
      @Override
      public boolean isAvailable()
      {
          return failureDetector.isAvailable();
      }
  
      public double getPhiThreshold()
      {
          return config.getPhiThreshold();
      }
  
      public int getArrivalWindowSize()
      {
          return config.getArrivalWindowSize();
      }
  
      @Override
      public String toString()
      {
          return "PhiAccrualFailureDetectStrategy{" +
                  "failureDetector=" + failureDetector +
                  "} " + super.toString();
      }
  
      public static class Config
              extends FailureDetectStrategy.Config
              implements Validatable
      {
          @DecimalMin(value = "0", inclusive = false)
          private double phiThreshold = 16;
          @Min(value = 0, inclusive = false)
          private int arrivalWindowSize = 100;
  
          public double getPhiThreshold()
          {
              return phiThreshold;
          }
  
          public void setPhiThreshold(float phiThreshold)
          {
              this.phiThreshold = phiThreshold;
          }
  
          public int getArrivalWindowSize()
          {
              return arrivalWindowSize;
          }
  
          void validateValues()
          {
              validate();
          }
  
          public void setArrivalWindowSize(int arrivalWindowSize)
          {
              this.arrivalWindowSize = arrivalWindowSize;
          }
      }
  }
  