Java blocking queue containing only unique elements

Question

sort of like a \"blocking set\". How can I implement a blocking queue where adding a member that is already in the set is ignored?

Answer 1

class BlockingSet extends ArrayBlockingQueue {
   /*Retain all other methods except put*/
   public void put(E o) throws InterruptedException {
      if (!this.contains(o)){
         super.put(o);
      }
   }
}