[dschobel]

if you want this on the JVM today and can abide Scala, see: http://doc.akka.io/docs/akka/snapshot/scala/dataflow.html

[spullara]

The Twitter solution I mention above is in Scala — that said, I have one that also works in JDK 6/7 in a branch of https://github.com/spullara/java-future-jdk8.