Module promise

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Classes

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UsageError
Raised when you do something inappropriate to a Promise.

Promise
I am a promise of a future result.

_MethodGetterWrapper

Functions

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_ignore(results)

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resolvedPromise(resolution)

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makePromise()

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send(o)
Make an eventual-send call on object o. source code

sendOnly(o)
Make an eventual-send call on object o, and ignore the results. source code

when(p)
Turn a Promise into a Deferred that will fire with the enclosed object when it is ready.

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Variables

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BROKEN = 3

CHAINED = 1

EVENTUAL = 0

NEAR = 2

Function Details

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send(o)

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Make an eventual-send call on object o. Use this as follows:

p = send(o).foo(args)

o can either be a Promise or an immediate value. The arguments can either be promises or immediate values.

send() always returns a Promise, and the o.foo(args) method invocation always takes place in a later reactor turn.

Many thanks to Mark Miller for suggesting this syntax to me.

when(p)

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Turn a Promise into a Deferred that will fire with the enclosed object when it is ready. Use this when you actually need to schedule something to happen in a synchronous fashion. Most of the time, you can just invoke methods on the Promise as if it were immediately available.