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// Copyright (C) 2022 The Android Open Source Project
//
// 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 com.google.gerrit.server.config;
import com.google.gerrit.metrics.MetricsReservoirConfig;
import com.google.gerrit.metrics.ReservoirType;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.time.Duration;
import java.util.Optional;
import java.util.concurrent.TimeUnit;
import org.eclipse.jgit.lib.Config;
/** Define metrics reservoir settings based on gerrit.config */
@Singleton
public class MetricsReservoirConfigImpl implements MetricsReservoirConfig {
private static final double RESERVOIR_ALPHA_DEFAULT = 0.015;
private static final int METRICS_RESERVOIR_SIZE_DEFAULT = 1028;
private static final long METRICS_RESERVOIR_WINDOW_MSEC_DEFAULT = 60000L;
private static final String METRICS_SECTION = "metrics";
private static final String METRICS_RESERVOIR = "reservoir";
private final ReservoirType reservoirType;
private final Duration reservoirWindow;
private final int reservoirSize;
private final double reservoirAlpha;
@Inject
MetricsReservoirConfigImpl(@GerritServerConfig Config gerritConfig) {
this.reservoirType =
gerritConfig.getEnum(
METRICS_SECTION, null, METRICS_RESERVOIR, ReservoirType.ExponentiallyDecaying);
reservoirWindow =
Duration.ofMillis(
ConfigUtil.getTimeUnit(
gerritConfig,
METRICS_SECTION,
reservoirType.name(),
"window",
METRICS_RESERVOIR_WINDOW_MSEC_DEFAULT,
TimeUnit.MILLISECONDS));
reservoirSize =
gerritConfig.getInt(
METRICS_SECTION, reservoirType.name(), "size", METRICS_RESERVOIR_SIZE_DEFAULT);
reservoirAlpha =
Optional.ofNullable(gerritConfig.getString(METRICS_SECTION, reservoirType.name(), "alpha"))
.map(Double::parseDouble)
.orElse(RESERVOIR_ALPHA_DEFAULT);
}
/* (non-Javadoc)
* @see com.google.gerrit.server.config.MetricsConfig#reservoirType()
*/
@Override
public ReservoirType reservoirType() {
return reservoirType;
}
/* (non-Javadoc)
* @see com.google.gerrit.server.config.MetricsConfig#reservoirWindow()
*/
@Override
public Duration reservoirWindow() {
return reservoirWindow;
}
/* (non-Javadoc)
* @see com.google.gerrit.server.config.MetricsConfig#reservoirSize()
*/
@Override
public int reservoirSize() {
return reservoirSize;
}
/* (non-Javadoc)
* @see com.google.gerrit.server.config.MetricsConfig#reservoirAlpha()
*/
@Override
public double reservoirAlpha() {
return reservoirAlpha;
}
}
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