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[bug修复] 修复多线程下ThreadLocalRandom共享seed导致随机数一样,权重概率bug

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yichengxian
2020-08-05 22:12:32 +08:00
parent ed708f730c
commit 7893cfe014
1 changed files with 3 additions and 2 deletions
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5
hutool-core/src/main/java/cn/hutool/core/lang/WeightRandom.java
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@@ -32,7 +32,7 @@ public class WeightRandom<T> implements Serializable {
private static final long serialVersionUID = -8244697995702786499L;
private final TreeMap<Double, T> weightMap;
private final Random random;
/**
* 创建权重随机获取器
@@ -50,7 +50,7 @@ public class WeightRandom<T> implements Serializable {
*/
public WeightRandom() {
weightMap = new TreeMap<>();
random = RandomUtil.getRandom();
}
/**
@@ -141,6 +141,7 @@ public class WeightRandom<T> implements Serializable {
if(MapUtil.isEmpty(this.weightMap)) {
return null;
}
final Random random = RandomUtil.getRandom();
final double randomWeight = this.weightMap.lastKey() * random.nextDouble();
final SortedMap<Double, T> tailMap = this.weightMap.tailMap(randomWeight, false);
return this.weightMap.get(tailMap.firstKey());