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Example code of happysir/distributed-lock

Informations about the package distributed-lock

[TOC]

锁

加锁是访问临界资源时对资源的保护机制，加锁的目的是对并发访问和并发请求进行保护，未获取到锁的请求将无权操作资源。

临界区域指的是一块对公共资源进行访问的代码，并非一种机制或是算法。一个程序、进程、线程可以拥有多个临界区域

安装

配置

详细参数：

使用

注解方式

当前组件提供了注解的方式使用分布式锁，使用方式如下： `

@DistributedLock注解说明

key 这里支持 symfony/expression-language 表达式，可以实现很多复杂的功能，详细文档。key 表达式内置 CLASS(类名) 和 METHOD(方法名称) 两个变量，方便开发者使用。详细使用参考Swoft服务限流章节

代码方式(显式使用)

DistributedLock::NON_BLOCKING
DistributedLock::RETRY_TO_GET

看门狗机制

存在这样一种场景，业务代码较为复杂，执行时长会超过我们申请锁的时间，这时候就可能有第二个线程成功申请锁，未达到我们想要的保护目的。

针对这样的场景，我们在组件中支持了锁自动续约机制-看门狗任务。

当我们成功获取锁后，程序会为我们创建一个协程，此协程的作用是续约我们的锁的过期时间。在锁被释放或者当前请求结束后，此协程会自动退出。

All versions of distributed-lock with dependencies

PHP Build Version
Package Version
Requires php Version >7.2
ext-redis Version *
ramsey/uuid Version 3.8.0
ext-json Version *
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