Question

I have the following blockingQueue;

  final BlockingQueue<Message> blockingQueue = new LinkedBlockingQueue<Message>();

where

public class Message {
    private String author;
    private String text;
        .......
//setters and getters
.....
}

I have a producers which put messages to queue.

now my goal is to create consumers which will be able to fetch from queue only messages for specific with specific author? Is it possible?

If not what could be alternative to BlockingQueue?

Answer 1

You can use a ConcurrentMap<String,BlockingQueue<Message>> where the string is the author

ConcurrentMap<String,BlockingQueue<Message>> map = ...;
public Message consume(String str){
  return map.get(str).take();
}
public void produce(Message message){
  map.get(message.getAuthor()).put(message);
}

This will require a unique BlockingQueue for each author.