com.vip.vjtools.vjkit.concurrent.limiter

Class Sampler

java.lang.Object

com.vip.vjtools.vjkit.concurrent.limiter.Sampler

Direct Known Subclasses:

Sampler.AlwaysSampler, Sampler.NeverSampler

public class Sampler
extends Object

采样器 移植 Twitter Common, 优化使用ThreadLocalRandom https://github.com/twitter/commons/blob/master/src/java/com/twitter/common/util/Sampler.java

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	Sampler.AlwaysSampler 采样率为100时，总是返回true
protected static class	Sampler.NeverSampler 采样率为0时，总是返回false

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Sampler()
protected	Sampler(double selectPercent)

Method Summary

Methods

Modifier and Type	Method and Description
static Sampler	create(Double selectPercent) 优化的创建函数，如果为0或100时，返回更直接的采样器
boolean	select() 判断当前请求是否命中采样

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Sampler

protected Sampler()

Sampler

protected Sampler(double selectPercent)

Parameters:

selectPercent - 采样率，在0-100 之间，可以有小数位

Method Detail

create

public static Sampler create(Double selectPercent)

优化的创建函数，如果为0或100时，返回更直接的采样器

select

public boolean select()

判断当前请求是否命中采样