singleton

command

v0.0.0-...-0216257 Latest Latest Go to latest Published: Jun 3, 2020 License: Apache-2.0 Imports: 2 Imported by: 0

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Singleton 单件：
       保证一个类仅有一个实例，并提供一个访问它的全局访问点

1.单纯使用is nil判断存在并发问题 2.使用mutex 锁机制，非原子操作 2.创建实例时，用同步库sync.Once来保证全局只有一个对象实例。