This project demonstrates the use of Firebase JobDispatcher to schedule recurring and one off jobs for your application.
The Core Components used are CoreJobService and JobScheduerFacade which help us implement a wrapper around the JobDispatcher framework.
This class is an abstract class and each class implementing this class will represent one Job that needs to be scheduled. The method onPerformJob() is where the Job begins. This job shall be performed on the Scheduler provided by the getOperationalScheduler() method. By default the scheduler is io but a child class can override this method to provide a different Scheduler like Schedulers.computation() or AndroidSchedulers.mainThread(). This will ensure that the Job is performed on the required Scheduler. The other abstract method shouldRetryIfInterrupted() should return a boolean representing whether the job should be rescheduled if an exception occurs.
This class exposes three methods to schedule and cancel jobs, scheduleOneOffJob, schedulePeriodicJob and cancelJob. Each job must have a unique identifier or tag that will help us cancel it, if required.
This package contains MainActivity which contains a playground to play with one such job created, named SimpleJobService which performs an operation that lasts for 10 seconds. This mocks a real work REST API call, for instance, which might have progress and result. If an exception arises during the execution of the job, we can either make the method throw an exception or catch the exception and return true or false denoting if the job should be rescheduled. We are using the same service for our recurring and one off tasks so we have used an interface TagProvider to differentiate between the tags.
