Examples of org.jgroups.util.Queue.peek()

org.jgroups.util.Queue.peek()
returns the first object on the queue, without removing it. If the queue is empty this object blocks until the first queue object has been added @return the first object on the queue

        final Queue queue=new Queue();
        queue.add("Q1");
        queue.add("Q2");
        queue.add("Q3");


        assert queue.peek().equals("Q1");
        assert queue.remove().equals("Q1");


        assert queue.peek().equals("Q2");
        assert queue.remove().equals("Q2");
        queue.add("Q5");

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        queue.add("Q3");


        assert queue.peek().equals("Q1");
        assert queue.remove().equals("Q1");


        assert queue.peek().equals("Q2");
        assert queue.remove().equals("Q2");
        queue.add("Q5");


        queue.close(true);

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        }


        int size=queue.size();
        queue.removeElement("Q5");
        assert queue.size() == size -1;
        assert queue.peek().equals("Q3");
        assert queue.remove().equals("Q3");
        assert queue.closed();
    }

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        assert queue.getLast().equals(queue.getFirst());


        queue.add(s2);
        assert queue.getFirst() != queue.getLast();


        Object o1=queue.peek();
        Object o2=queue.getFirst();


        System.out.println("o1=" + o1 + ", o2=" + o2 + ", o1.equals(o2)=" + o1.equals(o2));


        assert queue.getFirst().equals(queue.peek());

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        Object o1=queue.peek();
        Object o2=queue.getFirst();


        System.out.println("o1=" + o1 + ", o2=" + o2 + ", o1.equals(o2)=" + o1.equals(o2));


        assert queue.getFirst().equals(queue.peek());
        queue.remove();


        assert queue.size() == 1;
        assert queue.getLast().equals(queue.getFirst());
        queue.remove();

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    public static void testWaitUntilClosed2() {
        final Queue queue=new Queue();
        queue.close(true);
        try {
            queue.peek();
            assert false : "peek() should throw a QueueClosedException";
        }
        catch(QueueClosedException e) {
            assert e != null;
        }

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    public static void testWaitUntilClosed3() throws QueueClosedException {
        final Queue queue=new Queue();
        queue.add("one");
        queue.close(true);
        Object obj=queue.peek();
        assert obj.equals("one");
        assert queue.size() == 1;
        queue.remove();
        try {
            queue.peek();

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        Object obj=queue.peek();
        assert obj.equals("one");
        assert queue.size() == 1;
        queue.remove();
        try {
            queue.peek();
            assert false : "peek() should throw a QueueClosedException";
        }
        catch(QueueClosedException e) {
            assert e != null;
        }

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        final Queue queue=new Queue();
        queue.add("Q1");
        queue.add("Q2");
        queue.add("Q3");


        assert queue.peek().equals("Q1");
        assert queue.remove().equals("Q1");


        assert queue.peek().equals("Q2");
        assert queue.remove().equals("Q2");
        queue.add("Q5");

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        queue.add("Q3");


        assert queue.peek().equals("Q1");
        assert queue.remove().equals("Q1");


        assert queue.peek().equals("Q2");
        assert queue.remove().equals("Q2");
        queue.add("Q5");


        queue.close(true);

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