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Components

The library consists of three main parts.

TaskScheduler

The TaskScheduler stores tasks and schedules executions. For each task there exists exactly one execution in the status planned or running. If the task will only one time it only get one execution at all. For recurring tasks a new execution will be generated when the old one is completed or failed.

Each task consists of:

  • uuid: unique identifier
  • handlerClass: class-name of the handler which will be executed for this task
  • workload: the workload will be passed to the handler
  • interval: for recurring tasks this fields contains a cron-expression
  • firstExecution: the earliest possible execution
  • lastExecution: the latest possible execution

TaskRunner

The TaskRunner takes the planned executions and executes the Handler with the workload of the task.

Handler

The Handler implements the domain-logic for a task. The library implements a Factory which uses Reflection to create a new instance for the handlerClass of the task.

Note

The :doc:`symfony` uses tagged-services to find available Handler.