Programmer Reference : Asynchronous Programming : EsAsynchronousSupport
EsAsynchronousSupport
Description
This application provides support for asynchronous programming with Futures. Futures are objects that represent a computation whose return value might not be available yet. They are often used for potentially lengthy computations such as I/O and interaction with users.
  • User Objects: @see class comments for more details
  • EsFuture: An object representing a delayed computation.
  • EsPromise: A way to produce <EsFuture> objects and to complete them later with a value or error.
Features
  • Task Scheduler:
    • Specialized task scheduler that helps ensure the user has a chance to add all required exception handlers to a future before the future is completed.
  • Futures:
    • Objects representing a delayed computation
    • Custom futures that implement the EsFuture interface may be integrated into the framework
(@see @EsFuture-Interface category)
  • Turn any synchronous activity into an asynchronous activity (i.e. EsFuture on: [self doSyncActivity])
  • (Chainable) Create async call chains (i.e ((future then: [:result1 | self doSomething(result1)]) then: [:result2 | ...))
  • @see <EsFuture> class comments for more details
  • Promises:
    • Objects that provide a future and is used to programmatically complete the future.
    • Can be used to convert callback style to async style
    • @see <EsPromise> class comments for more details
  • Async Exception Handling
    • Async equivalents of #on:do: and ensure: are provided
    • Can signal arbitrary objects, in addition to other exceptions
    • All unhandled exceptions make their way to the <EsAsyncUncaughtErrorHandler> (logged to tty console by default)
Class Methods
None
Instance Methods
None
Last modified date: 04/21/2022