CODEWITHSUNDEEP
javamultithreading
yegor256
yegor256

Reputation: 105210

Mapping of one collection to another in multiple threads

I have a collection of objects, which I want to map to another collection, doing similar routine operations for every element. I'd like to do these atomic routine operations in parallel threads and looking for some ready-to-use library that can help me:

Collection<X> source = // ...
Collection<Y> result = Threader.map(
  source,
  new Mapping<X, Y>() {
    @Override
    public Y map(X src) {
      // do something and return an instance of Y
    }
  }
);

I understand that it's easy to implement but I don't want to re-invent the wheel. Do you know any libraries that contain such a Threader class?

I think that Java 8 streams are going to do something similar to this...

I submitted a feature request to Guava: https://code.google.com/p/guava-libraries/issues/detail?id=1422

Upvotes: 2

Views: 118

Answers (1)

lreeder
lreeder

Reputation: 12224

The functionaljava library may do what you want. It provides its own collection types that you can convert to/from java.util.Collection. The collection types have map operations for which you can provide your own functions, and a concurrency stategy for that mapping. There's a good blog posting on using functionaljava for parallel list processing here:

http://apocalisp.wordpress.com/2008/06/30/parallel-list-transformations/

Upvotes: 2

Related Questions