/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 6683213

 * @summary Test that the initial derived gauge is (Integer)0

 * @author Daniel Fuchs

 * @run clean DerivedGaugeMonitorTest

 * @run build DerivedGaugeMonitorTest

 * @run main DerivedGaugeMonitorTest

 */

import java.io.Serializable;

import java.util.concurrent.CountDownLatch;

import java.util.concurrent.TimeUnit;

import javax.management.MBeanServer;

import javax.management.MBeanServerFactory;

import javax.management.ObjectName;

import javax.management.monitor.CounterMonitor;

import javax.management.monitor.GaugeMonitor;

public class DerivedGaugeMonitorTest {

    public static interface Things {

        public long getALong();

        public int getAnInt();

        public double getADouble();

        public short getAShort();

        public byte getAByte();

        public float getAFloat();

    }

    public static interface MyMBean extends Things {

        public Things getAThing();

    }

    public static class MyThings implements Things, Serializable {

        private static final long serialVersionUID = -4333982919572564126L;

        private volatile long along = 0;

        private volatile int anint = 0;

        private volatile short ashort = 0;

        private volatile byte abyte = 0;

        private volatile float afloat = 0;

        private volatile double adouble = 0;

        private volatile transient boolean mutable;

        public MyThings() {

            this(false);

        }

        protected MyThings(boolean mutable) {

            this.mutable=mutable;

        }

        public long getALong() {

            return mutable?along++:along;

        }

        public int getAnInt() {

            return mutable?anint++:anint;

        }

        public double getADouble() {

            return mutable?adouble++:adouble;

        }

        public short getAShort() {

            return mutable?ashort++:ashort;

        }

        public byte getAByte() {

            return mutable?abyte++:abyte;

        }

        public float getAFloat() {

            return mutable?afloat++:afloat;

        }

        @Override

        public Object clone() throws CloneNotSupportedException {

            final MyThings other = (MyThings)super.clone();

            other.mutable=false;

            return other;

        }

    }

    public static class My implements MyMBean {

        public final CountDownLatch cdl = new CountDownLatch(6);

        private final MyThings things = new MyThings(true);

        private volatile int count = 0;

        public Things getAThing() {

            count++;

            cdl.countDown();

            try {

                return (Things) things.clone();

            } catch (CloneNotSupportedException ex) {

                return null;

            }

        }

        public long getALong() {

            count++;

            cdl.countDown();

            return things.getALong();

        }

        public int getAnInt() {

            count++;

            cdl.countDown();

            return things.getAnInt();

        }

        public double getADouble() {

            count++;

            cdl.countDown();

            return things.getADouble();

        }

        public short getAShort() {

            count++;

            cdl.countDown();

            return things.getAShort();

        }

        public byte getAByte() {

            count++;

            cdl.countDown();

            return things.getAByte();

        }

        public float getAFloat() {

            count++;

            cdl.countDown();

            return things.getAFloat();

        }

    }

    public static String[] attributes = {

        "AByte","AShort","AnInt","ALong","AFloat","ADouble"

    };

    public static String[] things = {

        "AThing.AByte","AThing.AShort","AThing.AnInt","AThing.ALong",

        "AThing.AFloat","AThing.ADouble"

    };

    public static void check(String attr, MBeanServer server, ObjectName mon,

            ObjectName mbean) throws Exception {

        final Object obj = server.getAttribute(mon, "DerivedGauge");

        check(attr,server,mon,mbean,obj);

    }

    public static void check(String attr, MBeanServer server, ObjectName mon,

            ObjectName mbean, Object obj) throws Exception  {

        if (obj == null)

            throw new Exception("Derived gauge for: " + attr +

                    " ["+mon+", "+mbean+"] is null!");

        if (!Integer.valueOf(0).equals(obj))

            throw new Exception("Derived gauge for: " + attr +

                    " ["+mon+", "+mbean+"] is "+obj);

    }

    public static void check(String attr, MBeanServer server, ObjectName mon,

            ObjectName mbean, long start) throws Exception {

        final Object obj = server.getAttribute(mon, "DerivedGauge");

        final long now = System.currentTimeMillis();

        final long gran = (Long)server.getAttribute(mon, "GranularityPeriod");

        if (now > start +2*gran) {

            throw new Exception(attr+": Can't verify test case: " +

                    "granularity period expired!");

        }

        check(attr,server,mon,mbean,obj);

    }

    public static void test(String attr) throws Exception {

        System.err.println("Testing "+ attr);

        final MBeanServer server = MBeanServerFactory.createMBeanServer();

        final ObjectName mbean = new ObjectName("ugly:type=cr.p");

        final My my = new My();

        final GaugeMonitor mon2 = new GaugeMonitor();

        final ObjectName mon2n = new ObjectName("mon1:type=GaugeMonitor");

        final CounterMonitor mon1 = new CounterMonitor();

        final ObjectName mon1n = new ObjectName("mon2:type=CounterMonitor");

        server.registerMBean(my, mbean);

        server.registerMBean(mon1, mon1n);

        server.registerMBean(mon2, mon2n);

        mon1.addObservedObject(mbean);

        mon1.setGranularityPeriod(60000); // 60 sec...

        mon1.setObservedAttribute(attr);

        mon1.setDifferenceMode(true);

        check(attr,server,mon1n,mbean);

        mon2.addObservedObject(mbean);

        mon2.setGranularityPeriod(60000); // 60 sec...

        mon2.setObservedAttribute(attr);

        mon2.setDifferenceMode(true);

        check(attr,server,mon2n,mbean);

        final long approxStart = System.currentTimeMillis();

        mon1.start();

        mon2.start();

        try {

            check(attr,server,mon1n,mbean,approxStart);

            check(attr,server,mon2n,mbean,approxStart);

            check(attr,server,mon1n,mbean,approxStart);

            check(attr,server,mon2n,mbean,approxStart);

            mon1.setGranularityPeriod(5);

            mon2.setGranularityPeriod(5);

            my.cdl.await(1000, TimeUnit.MILLISECONDS);

            if (my.cdl.getCount() > 0)

                throw new Exception(attr+": Count down not reached!");

            // just check that we don't get an exception now...

            System.err.println(attr+": [" + mon1n+

                    "] DerivedGauge is now "+

                    server.getAttribute(mon1n, "DerivedGauge"));

            System.err.println(attr+": [" + mon2n+

                    "] DerivedGauge is now "+

                    server.getAttribute(mon2n, "DerivedGauge"));

        } finally {

           try {mon1.stop();} catch (Exception x) {}

           try {mon2.stop();} catch (Exception x) {}

        }

    }

    public static void main(String[] args) throws Exception {

        for (String attr:attributes) {

            test(attr);

        }

        for (String attr:things) {

            test(attr);

        }

    }

}