gistfile1.groovy

import static groovyx.gpars.GParsPool.withPool

def words = "This is just a plain text to count words in".tokenize()
print count(words)

def count(arg) {
  withPool {
    return arg.parallel
      .map{[it, 1]}//probably implicit new MapEntry(it, 1) is better
//      .groupBy{it[0]} - this should be implicit
      .reduce {value1, value2 -> value1+value2}
      .collection
  }
}