spring-retry RetrySimulation 源码
spring-retry RetrySimulation 代码
文件路径：/src/main/java/org/springframework/retry/support/RetrySimulation.java
/*
* Copyright 2006-2022 the original author or authors.
*
* 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
*
* 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.
*/
package org.springframework.retry.support;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* The results of a simulation.
*/
public class RetrySimulation {
private final List<SleepSequence> sleepSequences = new ArrayList<>();
private final List<Long> sleepHistogram = new ArrayList<>();
public RetrySimulation() {
}
/**
* Add a sequence of sleeps to the simulation.
* @param sleeps the times to be created as a {@link SleepSequence}
*/
public void addSequence(List<Long> sleeps) {
sleepHistogram.addAll(sleeps);
sleepSequences.add(new SleepSequence(sleeps));
}
/**
* @return Returns a list of all the unique sleep values which were executed within
* all simulations.
*/
public List<Double> getPercentiles() {
List<Double> res = new ArrayList<>();
for (double percentile : new double[] { 10, 20, 30, 40, 50, 60, 70, 80, 90 }) {
res.add(getPercentile(percentile / 100));
}
return res;
}
public double getPercentile(double p) {
Collections.sort(sleepHistogram);
int size = sleepHistogram.size();
double pos = p * (size - 1);
int i0 = (int) pos;
int i1 = i0 + 1;
double weight = pos - i0;
return sleepHistogram.get(i0) * (1 - weight) + sleepHistogram.get(i1) * weight;
}
/**
* @return the longest total time slept by a retry sequence.
*/
public SleepSequence getLongestTotalSleepSequence() {
SleepSequence longest = null;
for (SleepSequence sequence : sleepSequences) {
if (longest == null || sequence.getTotalSleep() > longest.getTotalSleep()) {
longest = sequence;
}
}
return longest;
}
public static class SleepSequence {
private final List<Long> sleeps;
private final long longestSleep;
private final long totalSleep;
public SleepSequence(List<Long> sleeps) {
this.sleeps = sleeps;
this.longestSleep = Collections.max(sleeps);
long totalSleep = 0;
for (Long sleep : sleeps) {
totalSleep += sleep;
}
this.totalSleep = totalSleep;
}
public List<Long> getSleeps() {
return sleeps;
}
/**
* @return the longest individual sleep within this sequence
*/
public long getLongestSleep() {
return longestSleep;
}
public long getTotalSleep() {
return totalSleep;
}
public String toString() {
return "totalSleep=" + totalSleep + ": " + sleeps.toString();
}
}
}
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