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Quartz是Java领域最著名的开源任务调度工具。Quartz提供了极为广泛的特性如持久化任务,集群和分布式任务等,下面这篇文章主要给大家介绍了关于Quartz集群原理以及配置应用的相关资料,需要的朋友可以参考下
1、Quartz任务调度的基本实现原理
Quartz是OpenSymphony开源组织在任务调度领域的一个开源项目,完全基于Java实现。作为一个优秀的开源调度框架,Quartz具有以下特点:
(1)强大的调度功能,例如支持丰富多样的调度方法,可以满足各种常规及特殊需求;
(2)灵活的应用方式,例如支持任务和调度的多种组合方式,支持调度数据的多种存储方式;
(3)分布式和集群能力,Terracotta收购后在原来功能基础上作了进一步提升。本文将对该部分相加阐述。
1.1 Quartz 核心元素
Quartz任务调度的核心元素为:Scheduler——任务调度器、Trigger——触发器、Job——任务。其中trigger和job是任务调度的元数据,scheduler是实际执行调度的控制器。
Trigger是用于定义调度时间的元素,即按照什么时间规则去执行任务。Quartz中主要提供了四种类型的trigger:SimpleTrigger,CronTirgger,DateIntervalTrigger,和NthIncludedDayTrigger。这四种trigger可以满足企业应用中的绝大部分需求。
Job用于表示被调度的任务。主要有两种类型的job:无状态的(stateless)和有状态的(statef