Promises, Futures, and the Shape of Your Code

Transcript

1. 1.

   @gregheo C1 Mobile
 Summit

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   ++++++++[>++++[>++>+ ++>+++>+<<<<-]>+>+>- >>+[<]<-]>>.>---.+++ ++++..+++.>>.<-.<.++ +.------.--------.>> +.>++.

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   None
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   None
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   None
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   None
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   None
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   !

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   networker.beginRequest(.read, success: { data in
 })

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    networker.beginRequest(.read, success: { data in
 parser.parseRaw(data) { result in
 }

    })
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    networker.beginRequest(.read, success: { data in
 parser.parseRaw(data) { result in
 archiver.materialize(from:

    result) { objects in
 } } })
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    networker.beginRequest(.read, success: { data in
 parser.parseRaw(data) { result in
 archiver.materialize(from:

    result) { objects in
 dataStore.save(objects) { status in
 } } } })
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    networker.beginRequest(.read, success: { data in
 parser.parseRaw(data) { result in
 archiver.materialize(from:

    result) { objects in
 dataStore.save(objects) { status in
 print("Save success!") } } } }) print("Hello 1")
 print("Hello 2")
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    ⏰#

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    None
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    A B C X Y Z

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    networker.beginRequest(.read, success: { data in
 parser.parseRaw(data) { result in
 archiver.materialize(from:

    result) { objects in
 dataStore.save(objects) { status in
 print("Save success!") } } } }) print("Hello 1")
 print("Hello 2")
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    ⏰#

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    networker.beginRequest(.read, success: { data in
 parser.parseRaw(data) { result in
 archiver.materialize(from:

    result) { objects in
 dataStore.save(objects) { status in
 print("Save success!") } } } })
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    Clojure

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    Future

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    (defn square [x]
 (* x x)
 )

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    (defn square [x]
 (future (* x x))
 )

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    (defn saveToDisk [data]
 (future (
 ...
 ))
 )

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    saveToDisk future completed? cancelled? value

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    @myFuture
 
 (deref myFuture)


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    A X Y future B C D (deref future)

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    Future

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    Promise

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    @myPromise
 
 (deref myPromise)


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    getValue promise realized? value promise deliver

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    Promise

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    ❓

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    %&