Examples of org.jgroups.util.Queue$Element

org.jgroups.util.Queue
the class Element indicates an object in the queue. This element allows for the linked list algorithm by always holding a reference to the next element in the list. if Element.next is null, then this element is the tail of the list.

    }






    public static void testValues() throws QueueClosedException {
        final Queue queue=new Queue();
        queue.add(new Integer(1));
        queue.add(new Integer(3));
        queue.add(new Integer(99));
        queue.add(new Integer(8));
        System.out.println("queue: " + Util.dumpQueue(queue));
        int size=queue.size();
        assert size == 4;
        LinkedList values=queue.values();
        assert values.size() == size;
    }

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    public static void testLargeInsertion() throws QueueClosedException {
        String element="MyElement";
        long start, stop;
        final Queue queue=new Queue();


        System.out.println("Inserting 100000 elements");
        start=System.currentTimeMillis();
        for(int i=0; i < 100000; i++)
            queue.add(element);
        stop=System.currentTimeMillis();
        System.out.println("Took " + (stop - start) + " msecs");


        System.out.println("Removing 100000 elements");
        start=System.currentTimeMillis();
        while(queue.size() > 0)
            queue.remove();
        stop=System.currentTimeMillis();
        System.out.println("Took " + (stop - start) + " msecs");
    }

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    }






    public static void testEmptyQueue() {
        final Queue queue=new Queue();
        assert queue.getFirst() == null;
        assert queue.getLast() == null;
    }

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        assert queue.getLast() == null;
    }




    public static void testAddAll() throws QueueClosedException {
        final Queue queue=new Queue();
        List<String> l=new ArrayList<String>();
        l.add("one");
        l.add("two");
        l.add("three");
        queue.addAll(l);
        System.out.println("queue is " + queue);
        assert queue.size() == 3;
        assert queue.remove().equals("one");
        assert queue.size() == 2;
        assert queue.remove().equals("two");
        assert queue.size() == 1;
        assert queue.remove().equals("three");
        assert queue.size() == 0;
    }

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        assert queue.size() == 0;
    }




    public static void testInsertionAndRemoval() throws Exception {
        final Queue queue=new Queue();
        String s1="Q1", s2="Q2";


        queue.add(s1);
        assert queue.getFirst() != null;
        assert queue.getLast() != null;
        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());
        queue.remove();


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


        assert queue.size() == 0;
        assert queue.getFirst() == null;
        assert queue.getLast() == null;
    }

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    }






    public static void testWaitUntilClosed() {
        final Queue queue=new Queue();
        queue.close(true);
        queue.waitUntilClosed(0);
        assert queue.size() == 0;
    }

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        assert queue.size() == 0;
    }




    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;
        }
        assert queue.size() == 0;
    }

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        assert queue.size() == 0;
    }




    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();
            assert false : "peek() should throw a QueueClosedException";
        }
        catch(QueueClosedException e) {
            assert e != null;
        }
        assert queue.size() == 0;
    }

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        assert queue.size() == 0;
    }




    public static void testWaitUntilClosed4() throws QueueClosedException {
        final Queue queue=new Queue();
        for(int i=0; i < 10; i++)
            queue.add(new Integer(i));
        new Thread() {
            public void run() {
                while(!queue.closed()) {
                    try {
                        System.out.println("-- removed " + queue.remove());
                        Util.sleep(200);
                    }
                    catch(QueueClosedException e) {
                        break;
                    }
                }
            }
        }.start();
        queue.close(true);
        queue.waitUntilClosed(0);
        assert queue.size() == 0;
    }

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    }






    public static void testWaitUntilClosed5() throws QueueClosedException {
        final Queue queue=new Queue();
        for(int i=0; i < 10; i++)
            queue.add(new Integer(i));
        new Thread() {
            public void run() {
                while(!queue.closed()) {
                    try {
                        System.out.println("-- removed " + queue.remove());
                        Util.sleep(200);
                    }
                    catch(QueueClosedException e) {
                        System.out.println("-- queue is closed, cannot remove element");
                        break;
                    }
                }
            }
        }.start();


        Util.sleep(600);
        queue.close(false);
        queue.waitUntilClosed(0);
        assert queue.size() > 0;
    }

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