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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (RNG-57) CachedUniformRandomProvider for nextBoolean() and nextInt()
Date Tue, 16 Oct 2018 11:03:00 GMT

     [ https://issues.apache.org/jira/browse/RNG-57?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gilles updated RNG-57:
----------------------
    Affects Version/s:     (was: 1.2)
        Fix Version/s: 1.2
          Component/s:     (was: sampling)
                       core

> CachedUniformRandomProvider for nextBoolean() and nextInt()
> -----------------------------------------------------------
>
>                 Key: RNG-57
>                 URL: https://issues.apache.org/jira/browse/RNG-57
>             Project: Commons RNG
>          Issue Type: Improvement
>          Components: core
>            Reporter: Alex D Herbert
>            Priority: Minor
>              Labels: performance
>             Fix For: 1.2
>
>
> Implement a wrapper around a {{UniformRandomProvider}} that can cache the underlying
source of random bytes for use in the methods {{nextBoolean()}} and {{nextInt()}} (in the
case of {{LongProvider}}). E.g.
> {code:java}
> LongProvider provider = RandomSource.create(RandomSource.SPLIT_MIX_64);
> CachedLongProvider rng = new CachedLongProvider(provider);
> // Uses cached nextLong() 64 times
> rng.nextBoolean();
> // Uses cached nextLong() twice
> rng.nextInt();
> IntProvider provider = RandomSource.create(RandomSource.KISS);
> CachedIntProvider rng2 = new CachedIntProvider(provider);
> // Uses cached nextInt() 32 times
> rng2.nextBoolean();
> // This could be wrapped by a factory method:
> UniformRandomProvider rng = CachedUniformRandomProviderFactory.wrap(
>         // Any supported source: IntProvider or LongProvider
>         RandomSource.create(RandomSource...));
> {code}
> The implementation should be speed tested to determine the benefit for {{nextBoolean()}}
and if {{nextInt()}} can be improved for {{LongProviders}}.



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