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 *

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 * 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

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 *

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

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 */

/*

 * @test

 * @bug 4909536

 * @summary Ensure that the Introspector does not retain refs to classes

 * @requires vm.opt.final.ClassUnloading

 * @author Eamonn McManus

 *

 * @run clean ClassLeakTest

 * @run build ClassLeakTest

 * @run main ClassLeakTest

 */

import java.lang.ref.WeakReference;

import java.io.File;

import java.nio.file.Paths;

import java.net.*;

import java.util.*;

import javax.management.*;

import javax.management.loading.*;

public class ClassLeakTest {

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

        System.out.println("Testing that registering and unregistering a " +

                           "Standard MBean does not retain a reference to " +

                           "the MBean's class");

        String[] cpaths = System.getProperty("test.classes", ".")

                                .split(File.pathSeparator);

        URL[] urls = new URL[cpaths.length];

        for (int i=0; i < cpaths.length; i++) {

            urls[i] = Paths.get(cpaths[i]).toUri().toURL();

        }

        PrivateMLet mlet = new PrivateMLet(urls, null, false);

        Class<?> shadowClass = mlet.loadClass(TestMBean.class.getName());

        if (shadowClass == TestMBean.class) {

            System.out.println("TEST INVALID: MLet got original " +

                               "TestMBean not shadow");

            System.exit(1);

        }

        shadowClass = null;

        MBeanServer mbs = MBeanServerFactory.createMBeanServer();

        ObjectName mletName = new ObjectName("x:type=mlet");

        mbs.registerMBean(mlet, mletName);

        ObjectName testName = new ObjectName("x:type=test");

        mbs.createMBean(Test.class.getName(), testName, mletName);

        ClassLoader testLoader = mbs.getClassLoaderFor(testName);

        if (testLoader != mlet) {

            System.out.println("TEST INVALID: MBean's class loader is not " +

                               "MLet: " + testLoader);

            System.exit(1);

        }

        testLoader = null;

        MBeanInfo info = mbs.getMBeanInfo(testName);

        MBeanAttributeInfo[] attrs = info.getAttributes();

        if (attrs.length != 1 || !attrs[0].getName().equals("A")

            || !attrs[0].isReadable() || !attrs[0].isWritable()

            || attrs[0].isIs() || !attrs[0].getType().equals("int")) {

            System.out.println("TEST FAILED: unexpected MBeanInfo attrs");

            System.exit(1);

        }

        MBeanOperationInfo[] ops = info.getOperations();

        if (ops.length != 1 || !ops[0].getName().equals("bogus")

            || ops[0].getSignature().length > 0

            || ops[0].getImpact() != MBeanOperationInfo.UNKNOWN

            || !ops[0].getReturnType().equals("void")) {

            System.out.println("TEST FAILED: unexpected MBeanInfo ops");

            System.exit(1);

        }

        if (info.getConstructors().length != 2) {

            System.out.println("TEST FAILED: wrong number of constructors " +

                               "in introspected bean: " +

                               Arrays.asList(info.getConstructors()));

            System.exit(1);

        }

        if (!info.getClassName().endsWith("Test")) {

            System.out.println("TEST FAILED: wrong info class name: " +

                               info.getClassName());

            System.exit(1);

        }

        mbs.unregisterMBean(testName);

        mbs.unregisterMBean(mletName);

        WeakReference mletRef = new WeakReference(mlet);

        mlet = null;

        System.out.println("MBean registered and unregistered, waiting for " +

                           "garbage collector to collect class loader");

        for (int i = 0; i < 10000 && mletRef.get() != null; i++) {

            System.gc();

            Thread.sleep(1);

        }

        if (mletRef.get() == null)

            System.out.println("Test passed: class loader was GC'd");

        else {

            System.out.println("TEST FAILED: class loader was not GC'd");

            System.exit(1);

        }

    }

    public static interface TestMBean {

        public void bogus();

        public int getA();

        public void setA(int a);

    }

    public static class Test implements TestMBean {

        public Test() {}

        public Test(int x) {}

        public void bogus() {}

        public int getA() {return 0;}

        public void setA(int a) {}

    }

}