Java bounded non-blocking buffer for high concurrent situation

Question

Basically I need a data structure to store the temporary chatting messages on the server side. It should be:

• bounded: because I don\'t need store too many messa

Answer 1

You can add non-blocking behaviour to an ArrayBlockingQueue by surrounding it with a conditional offer() statement, where failure of the queue to accept the offer results in the head being dropped and the offer being re-made:

    public class LearnToQueue {


    public static void main(String[] args){
        Queue FIFO = new ArrayBlockingQueue(4);

        int i = 0;

        while ( i < 10 ){

            if (!FIFO.offer(i)){
            // You can pipe the head of the queue anywhere you want to
                FIFO.remove();
                FIFO.offer(i);
            }
            System.out.println(FIFO.toString());
            i++;

        }
    }

    }