Package org.jgroups.blocks.atomic

Examples of org.jgroups.blocks.atomic.Counter



    void loop() throws Exception {
        CounterService counter_service=new CounterService(ch);
        ch.connect("counter-cluster");
        Counter counter=counter_service.getOrCreateCounter("mycounter", 1);

        boolean looping=true;
        while(looping) {
            try {
                int key=Util.keyPress("[1] Increment [2] Decrement [3] Compare and set\n" +
                                        "[4] Create counter [5] Delete counter\n" +
                                        "[6] Print counters [7] Get counter\n" +
                                        "[8] Increment 1M times [9] Dump pending requests [x] Exit\n");
                switch(key) {
                    case '1':
                        long val=counter.incrementAndGet();
                        System.out.println("counter: " + val);
                        break;
                    case '2':
                        val=counter.decrementAndGet();
                        System.out.println("counter: " + val);
                        break;
                    case '3':
                        long expect=Util.readLongFromStdin("expected value: ");
                        long update=Util.readLongFromStdin("update: ");
                        if(counter.compareAndSet(expect, update)) {
                            System.out.println("-- set counter \"" + counter.getName() + "\" to " + update + "\n");
                        }
                        else {
                            System.err.println("failed setting counter \"" + counter.getName() + "\" from " + expect +
                                                 " to " + update + ", current value is " + counter.get() + "\n");
                        }
                        break;
                    case '4':
                        String counter_name=Util.readStringFromStdin("counter name: ");
                        counter=counter_service.getOrCreateCounter(counter_name, 1);
                        break;
                    case '5':
                        counter_name=Util.readStringFromStdin("counter name: ");
                        counter_service.deleteCounter(counter_name);
                        break;
                    case '6':
                        System.out.println("Counters (current=" + counter.getName() + "):\n\n" + counter_service.printCounters());
                        break;
                    case '7':
                        counter.get();
                        break;
                    case '8':
                        int NUM=Util.readIntFromStdin("num: ");
                        System.out.println("");
                        int print=NUM / 10;
                        long retval=0;
                        long start=System.currentTimeMillis();
                        for(int i=0; i < NUM; i++) {
                            retval=counter.incrementAndGet();
                            if(i > 0 && i % print == 0)
                                System.out.println("-- count=" + retval);
                        }
                        long diff=System.currentTimeMillis() - start;
                        System.out.println("\n" + NUM + " incrs took " + diff + " ms; " + (NUM / (diff / 1000.0)) + " ops /sec\n");
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        fc1.connect("foo");
        fc2.connect("bar");

        CounterService cs1=new CounterService(fc1), cs2=new CounterService(fc2);

        Counter c1=cs1.getOrCreateCounter("counter", 1), c2=cs2.getOrCreateCounter("counter", 1);
        System.out.println("counter1=" + c1 + ", counter2=" + c2);
        assert c1.get() == 1 && c2.get() == 1;

        c1.addAndGet(5);
        System.out.println("counter1=" + c1 + ", counter2=" + c2);
        assert c1.get() == 6 && c2.get() == 6;

        c2.compareAndSet(6, 10);
        System.out.println("counter1=" + c1 + ", counter2=" + c2);
        assert c1.get() == 10 && c2.get() == 10;
    }
View Full Code Here

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