OR-5283 Schedulers:: Scheduler implementations:: ImmediateScheduler

[crazymanish]

Context

• Close ticket: [w32(6august-12august)] Schedulers: Practices/exercises #47

Scheduler

• https://developer.apple.com/documentation/combine/scheduler/
• A scheduler is a protocol that defines when and how to execute a closure.
• You can use a scheduler to execute code as soon as possible, or after a future date.
• Schedulers can accept options to control how they execute the actions passed to them. These options may control factors like which threads or dispatch queues execute the actions.

In this PR

• Schedulers:: Scheduler implementations:: ImmediateScheduler
• Apple provides several concrete implementations of the Scheduler protocol:

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• ImmediateScheduler: A simple scheduler that executes code immediately on the current thread, which is the default execution context unless modified using subscribe(on:), receive(on:) or any of the other operators which take a scheduler as parameter.
• You can only use this scheduler for immediate actions. If you attempt to schedule actions after a specific date, this scheduler ignores the date and performs them immediately.
• https://developer.apple.com/documentation/combine/immediatescheduler

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• RunLoop: Tied to Foundation’s Thread object.
• DispatchQueue: Can either be serial or concurrent. most versatile and useful scheduler
• OperationQueue: A queue that regulates the execution of work items.