Java中的序列生成器，用于唯一ID [英] Sequence Generator in Java for Unique Id

问题描述

我打算在post期间编写一个序列生成器，在我的REST资源实现类中使用
生成
唯一id。由于每个post请求都由单独的线程处理，
我使变量volatile和方法同步。
我没有选择使用序列或传统RDBMS提供的
。

I am planning to write a sequence generator which will be used in my REST resource implementation class during post to generate unique id. Since every post request is handled by separate thread, I made the variable volatile and method synchronized. I don't have option to use sequences or something which traditional RDBMS provides.

public class SequenceGen {
    volatile static int n = 0;  
    public synchronized int nextNum(){
        return n++;
    }   
}

这是我到目前为止所做的，并计划到在我的REST实现中创建
SequenceGen的变量。我的实际问题是它会在某个地方突破吗？我测试了两个线程，我没有看到
任何值重复。

this is what I have so far, and planning to create a variable of SequenceGen in my REST Implementation. My actual question is will it break somewhere ? I tested with two threads and I dont see any value repeated.

推荐答案

它会工作，但是 AtomicInteger 是一种内置类型，非常适合您的使用案例。

It will work, however AtomicInteger is an built in type that is perfect for your use case.

AtomicInteger seq = new AtomicInteger();
int nextVal = seq.incrementAndGet();

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