Line data    Source code

       1             : // Copyright (C) 2022 The Android Open Source Project
       2             : //
       3             : // Licensed under the Apache License, Version 2.0 (the "License");
       4             : // you may not use this file except in compliance with the License.
       5             : // You may obtain a copy of the License at
       6             : //
       7             : // http://www.apache.org/licenses/LICENSE-2.0
       8             : //
       9             : // Unless required by applicable law or agreed to in writing, software
      10             : // distributed under the License is distributed on an "AS IS" BASIS,
      11             : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             : // See the License for the specific language governing permissions and
      13             : // limitations under the License.
      14             : 
      15             : package com.google.gerrit.server.config;
      16             : 
      17             : import com.google.gerrit.metrics.MetricsReservoirConfig;
      18             : import com.google.gerrit.metrics.ReservoirType;
      19             : import com.google.inject.Inject;
      20             : import com.google.inject.Singleton;
      21             : import java.time.Duration;
      22             : import java.util.Optional;
      23             : import java.util.concurrent.TimeUnit;
      24             : import org.eclipse.jgit.lib.Config;
      25             : 
      26             : /** Define metrics reservoir settings based on gerrit.config */
      27             : @Singleton
      28             : public class MetricsReservoirConfigImpl implements MetricsReservoirConfig {
      29             :   private static final double RESERVOIR_ALPHA_DEFAULT = 0.015;
      30             :   private static final int METRICS_RESERVOIR_SIZE_DEFAULT = 1028;
      31             :   private static final long METRICS_RESERVOIR_WINDOW_MSEC_DEFAULT = 60000L;
      32             :   private static final String METRICS_SECTION = "metrics";
      33             :   private static final String METRICS_RESERVOIR = "reservoir";
      34             : 
      35             :   private final ReservoirType reservoirType;
      36             : 
      37             :   private final Duration reservoirWindow;
      38             :   private final int reservoirSize;
      39             :   private final double reservoirAlpha;
      40             : 
      41             :   @Inject
      42         138 :   MetricsReservoirConfigImpl(@GerritServerConfig Config gerritConfig) {
      43         138 :     this.reservoirType =
      44         138 :         gerritConfig.getEnum(
      45             :             METRICS_SECTION, null, METRICS_RESERVOIR, ReservoirType.ExponentiallyDecaying);
      46             : 
      47         138 :     reservoirWindow =
      48         138 :         Duration.ofMillis(
      49         138 :             ConfigUtil.getTimeUnit(
      50             :                 gerritConfig,
      51             :                 METRICS_SECTION,
      52         138 :                 reservoirType.name(),
      53             :                 "window",
      54             :                 METRICS_RESERVOIR_WINDOW_MSEC_DEFAULT,
      55             :                 TimeUnit.MILLISECONDS));
      56         138 :     reservoirSize =
      57         138 :         gerritConfig.getInt(
      58         138 :             METRICS_SECTION, reservoirType.name(), "size", METRICS_RESERVOIR_SIZE_DEFAULT);
      59         138 :     reservoirAlpha =
      60         138 :         Optional.ofNullable(gerritConfig.getString(METRICS_SECTION, reservoirType.name(), "alpha"))
      61         138 :             .map(Double::parseDouble)
      62         138 :             .orElse(RESERVOIR_ALPHA_DEFAULT);
      63         138 :   }
      64             : 
      65             :   /* (non-Javadoc)
      66             :    * @see com.google.gerrit.server.config.MetricsConfig#reservoirType()
      67             :    */
      68             :   @Override
      69             :   public ReservoirType reservoirType() {
      70          15 :     return reservoirType;
      71             :   }
      72             : 
      73             :   /* (non-Javadoc)
      74             :    * @see com.google.gerrit.server.config.MetricsConfig#reservoirWindow()
      75             :    */
      76             :   @Override
      77             :   public Duration reservoirWindow() {
      78           0 :     return reservoirWindow;
      79             :   }
      80             : 
      81             :   /* (non-Javadoc)
      82             :    * @see com.google.gerrit.server.config.MetricsConfig#reservoirSize()
      83             :    */
      84             :   @Override
      85             :   public int reservoirSize() {
      86          15 :     return reservoirSize;
      87             :   }
      88             : 
      89             :   /* (non-Javadoc)
      90             :    * @see com.google.gerrit.server.config.MetricsConfig#reservoirAlpha()
      91             :    */
      92             :   @Override
      93             :   public double reservoirAlpha() {
      94          15 :     return reservoirAlpha;
      95             :   }
      96             : }