[concurrency-interest] ImmediateFuture

Kevin Bourrillion kevinb at google.com
Wed Jun 17 12:14:38 EDT 2009


Our own Futures.immediateFuture() utility is fairly popular as well, and not
only in test code.  For example, sometimes an interface wants to only
require a Future to be returned, but an implementation happens to already
have the value.


On Wed, Jun 17, 2009 at 8:38 AM, Jim Andreou <jim.andreou at gmail.com> wrote:

> One could use something like this, to avoid introducing a new type:
>
> private static final Runnable emptyRunnable = new Runnable() { public void
> run() { } };
> public static <T> Future<T> futureFor(T value) {
>     return new FutureTask<T>(emptyRunnable, value);
> }
>
> 2009/6/17 Joe Kearney <Joe.Kearney at morganstanley.com>
>
> I had to write one of these, I called it ConstantFuture. Fairly trivial
>> implementation, but would be nice to have on hand.
>>
>> 2009/6/17 Mark Thornton <mthornton at optrak.co.uk>
>>
>>> For test purposes I created an ImmediateFuture class which implements
>>> Future but where the value already exists. Am I the only person to have
>>> found the need to do this or should something like it be considered for more
>>> general use?
>>>
>>>
>>> Mark Thornton
>>>
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>>
>>
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