at:tutorial:appendix
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=== Multifutures === | === Multifutures === | ||
- | The module ''/ | + | The module ''/ |
+ | |||
+ | A multifuture is constructed as follows: | ||
+ | < | ||
+ | def [mf, resolver] := makeMultiFuture(n, | ||
+ | </ | ||
+ | |||
+ | The parameter '' | ||
+ | |||
+ | A multifuture accepts the following listeners: | ||
+ | |||
+ | < | ||
+ | whenEach: multiFuture becomes: { |val| ... } | ||
+ | </ | ||
+ | |||
+ | The above listener is invoked whenever the future is resolved with a new value. Its code can thus be executed multiple times. | ||
+ | |||
+ | < | ||
+ | whenAll: multiFuture resolved: { |values| | ||
+ | ... | ||
+ | } ruined: { |exceptions| ... } | ||
+ | </ | ||
+ | |||
+ | The above listener is invoked if all results have been gathered (only possible if the maximum number of results is known) or when the '' | ||
+ | |||
+ | Note the following properties of multifutures: | ||
+ | * It is allowed to register a whenAll: | ||
+ | * As with futures, it is legal to send asynchronous messages to the multifuture, | ||
+ | * When a multifuture A is resolved with a multifuture B, all of B's eventual values/ | ||
+ | * A whenEach: | ||
+ | * Like with futures, multifutures can be explicitly created, e.g.: | ||
+ | < | ||
+ | * Multifutures can be attached to messages by annotating an asynchronous message with the @Gather(n) type tag. | ||
+ | * Adding a when: | ||
+ | |||
+ | The multifutures module also exports an abstraction known as a " | ||
+ | |||
+ | When the message sent to a multireference is annotated with @Due(t), the timeout is applied to the implicit multifuture, | ||
==== Dynamic Variables ==== | ==== Dynamic Variables ==== |
at/tutorial/appendix.txt · Last modified: 2021/09/24 10:28 by elisag