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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.metrics.dropwizard;
import com.codahale.metrics.ExponentiallyDecayingReservoir;
import com.codahale.metrics.Reservoir;
import com.codahale.metrics.SlidingTimeWindowArrayReservoir;
import com.codahale.metrics.SlidingTimeWindowReservoir;
import com.codahale.metrics.SlidingWindowReservoir;
import com.codahale.metrics.UniformReservoir;
import com.google.gerrit.metrics.MetricsReservoirConfig;
import com.google.gerrit.metrics.ReservoirType;
import java.util.concurrent.TimeUnit;
class DropWizardReservoirProvider {
private DropWizardReservoirProvider() {}
static Reservoir get(MetricsReservoirConfig config) {
ReservoirType reservoirType = config.reservoirType();
switch (reservoirType) {
case ExponentiallyDecaying:
return new ExponentiallyDecayingReservoir(config.reservoirSize(), config.reservoirAlpha());
case SlidingTimeWindowArray:
return new SlidingTimeWindowArrayReservoir(
config.reservoirWindow().toMillis(), TimeUnit.MILLISECONDS);
case SlidingTimeWindow:
return new SlidingTimeWindowReservoir(
config.reservoirWindow().toMillis(), TimeUnit.MILLISECONDS);
case SlidingWindow:
return new SlidingWindowReservoir(config.reservoirSize());
case Uniform:
return new UniformReservoir(config.reservoirSize());
default:
throw new IllegalArgumentException(
"Unsupported metrics reservoir type " + reservoirType.name());
}
}
}
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