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55 changes: 55 additions & 0 deletions
55
core/src/main/java/com/linecorp/armeria/common/loadbalancer/AggregationWeightTransition.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| /* | ||
| * Copyright 2025 LINE Corporation | ||
| * | ||
| * LINE Corporation 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: | ||
| * | ||
| * https://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. | ||
| */ | ||
|
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| package com.linecorp.armeria.common.loadbalancer; | ||
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| import com.google.common.base.MoreObjects; | ||
| import com.google.common.primitives.Ints; | ||
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| final class AggregationWeightTransition<T> implements WeightTransition<T> { | ||
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| private final double aggressionPercentage; | ||
| private final double invertedAggression; | ||
| private final double minWeightPercent; | ||
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| AggregationWeightTransition(double aggression, double minWeightPercent) { | ||
| aggressionPercentage = Ints.saturatedCast(Math.round(aggression * 100)); | ||
| invertedAggression = 100.0 / aggressionPercentage; | ||
| this.minWeightPercent = minWeightPercent; | ||
| } | ||
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| @Override | ||
| public int compute(T candidate, int weight, int currentStep, int totalSteps) { | ||
| final int minWeight = Ints.saturatedCast(Math.round(weight * minWeightPercent)); | ||
| final int computedWeight; | ||
| if (aggressionPercentage == 100) { | ||
| computedWeight = WeightTransition.linear().compute(candidate, weight, currentStep, totalSteps); | ||
| } else { | ||
| computedWeight = (int) (weight * Math.pow(1.0 * currentStep / totalSteps, | ||
| invertedAggression)); | ||
| } | ||
| return Math.max(computedWeight, minWeight); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return MoreObjects.toStringHelper(this) | ||
| .add("aggressionPercentage", aggressionPercentage) | ||
| .add("invertedAggression", invertedAggression) | ||
| .add("minWeightPercent", minWeightPercent) | ||
| .toString(); | ||
| } | ||
| } |
42 changes: 42 additions & 0 deletions
42
core/src/main/java/com/linecorp/armeria/common/loadbalancer/LinearWeightTransition.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| /* | ||
| * Copyright 2025 LINE Corporation | ||
| * | ||
| * LINE Corporation 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: | ||
| * | ||
| * https://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. | ||
| */ | ||
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| package com.linecorp.armeria.common.loadbalancer; | ||
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| import com.google.common.primitives.Ints; | ||
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| final class LinearWeightTransition<T> implements WeightTransition<T> { | ||
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| static final LinearWeightTransition<?> INSTANCE = new LinearWeightTransition<>(); | ||
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| @Override | ||
| public int compute(T candidate, int weight, int currentStep, int totalSteps) { | ||
| // currentStep is never greater than totalSteps so we can cast long to int. | ||
| final int currentWeight = | ||
| Ints.saturatedCast((long) weight * currentStep / totalSteps); | ||
| if (weight > 0 && currentWeight == 0) { | ||
| // If the original weight is not 0, | ||
| // we should return 1 to make sure the endpoint is selected. | ||
| return 1; | ||
| } | ||
| return currentWeight; | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return "WeightTransition.linear()"; | ||
| } | ||
| } |
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