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Future in WebApp (Java)
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Kengo TODA
July 17, 2016
Technology
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180
Future in WebApp (Java)
Short description about Future and CompletableFuture
Kengo TODA
July 17, 2016
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Transcript
Future in WebApp Kengo TODA
Agenda • What is Future • What is CompletableFuture •
Common usage in WebApp
What is Future? • Proxy interface to get result of
async operation • Similar with JavaScript’s Promise
Ask, and it will be given to you
How to implement method which returns Future instance? • Asynchronous
Method Invocation (Java EE 6) • Creating Asynchronous Methods (Spring Framework)
What is CompletableFuture • New class from Java8, implements Future
interface • Similar with ListenableFuture in Guava and Spring Framework
Apply result to Function,
or combine them.
Merit: connect result of Async I/O seamlessly auth add new
post load timeline START END
None
When we use them? • When call async I/O •
Datastore • Message Queue • Cache • RESTful API
Example: When we use them? • If you are service
provider, • Public service API (interface for user) should return CompletableFuture instance if it may use I/O internally. • Then during I/O is running, your user can use current thread for other usage.
Keywords to google • Promise, Future • CompletableFuture • ListenableFuture
(Guava & Spring Framework) • Function composition