PHP框架Swoole的一个定时器Timer特性
在各种业务型系统中,往往需要服务器在后台扫描相关数据,触发相应的统计、通知等操作。 比如对于一个项目管理系统,需要每天的特定时间内,统计每项任务的执行、到期情况、整个项目的进度等等,根据统计情况,做相应通知处理; 这样一个场景,如何编程实现
在各种业务型系统中,往往需要服务器在后台扫描相关数据,触发相应的统计、通知等操作。
比如对于一个项目管理系统,需要每天的特定时间内,统计每项任务的执行、到期情况、整个项目的进度等等,根据统计情况,做相应通知处理;
这样一个场景,如何编程实现?
用一般的编程方式,是无法实现自动触发与统计的。当然,简单的思路,是利于系统的cron job机制。但这种方式,对于配置及可靠性方面,需要比较多的人为操作因素。
Swoole是一个使用c开发的php扩展,通过php就可以实现高性能web服务器,同时,还内置了定时器Timer、任务队列Task特性。这样,基于swoole,你可以在程序层面控制实现方式,减少对外部工具 - 独立的消息队列服务器、定时任务管理工具等的依赖性。
swoole的强大之处就在与其进程模型的设计,既解决了异步问题,又解决了并行。
swoole_server_addtimer($serv, 10);
第二个参数是定时器的间隔时间,单位为秒。swoole定时器的最小颗粒是1秒。支持多个定时器。注意不能存在2个相同间隔时间的定时器。 增加定时器后需要写一个回调函数
swoole_server_handler(<span>$serv</span>, 'onTimer',<span> my_OnTimer); </span><span>function</span> my_OnTimer(<span>$serv</span>, <span>$interval</span><span>) { </span><span>echo</span> "Timer[<span>$interval</span>] is call\n"<span>; }</span>
Task模块,用来做一些异步的慢速任务,比如webim中发广播。类似node.js,假如有10万个连接,要发广播时,那会循环10万次,这时候程序不能做任何事情,不能接受新的连接,也不能收包发包。
而swoole不同,丢给task进程之后,你的reactor,worker照跑不误。任务完成后会异步地通知worker进程告诉它此任务已经完成。
当然task模块的作用还不仅如此,实现PHP的数据库连接池,异步队列等等,还需要进一步挖掘。
参考:
http://rango.swoole.com/archives/305

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