Quartz is an open source job-scheduling framework written entirely in Java and designed for use in both J2SE and J2EE applications.
You can create complex schedules for executing any job Examples are e.g tasks that run daily. every other Friday at 7:30 p.m or only on the last day of every month
To ensure scalability, Quartz is based on a multi-threaded architecture. When started, the framework initializes a set of worker threads that are used by the Scheduler to execute Jobs.
This is how the frame work can run many jobs cuncurrently It also relies on a loosely coupled set of ThreadPool management components for managing the thread environment.
The key interfaces of the API are:
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Scheduler - the primary API for interacting with the scheduler of the framework
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Job - an interface to be implemented by components that we wish to have executed
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JobDetail - used to define instances of Jobs
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Trigger - a component that determines the schedule upon which a given Job will be performed
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JobBuilder - used to build JobDetail instances, which define instances of Jobs
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TriggerBuilder - used to build Trigger instances.