javascalautils.concurrent

Class PromiseCompanion

java.lang.Object

javascalautils.concurrent.PromiseCompanion

public final class PromiseCompanion
extends Object

Acts as a Scala type companion object for Promise.
The primary purpose is to get the Scala feel of instantiating classes.
In Scala you can define a companion object for a class, acting as a static reference/singleton for that class allowing you do define factory methods.
One use case is to define methods with the same name as the class and let these methods invoke the constructor thus creating a nice way to create instances without using the word "new".
This can be achieved in java by statically importing a method and then using it.
The limitation is that classes may not have method with the same name as the class itself hence new companion classes have to be created.
To be able to use it in a neat concise way one needs to statically import the method.

 import static javascalautils.PromiseCompanion.Promise;
 
 Promise<String> promise = Promise();
 

Since:

1.3

Author:

Peter Nerg

Method Summary

Modifier and Type	Method and Description
static <T> Promise<T>	Promise() Creates an instance of Promise.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

Promise

public static <T> Promise<T> Promise()

Creates an instance of Promise.
Best used in conjunction with statically importing this method.

 import static javascalautils.concurrent.FutureCompanion.Promise;
 
 Promise<String> promise = Promise();
 

Type Parameters:

T - The type the Promise is expected to deliver

Returns:

The Promise instance