/*

 * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2018, SAP SE. All rights reserved.

 * 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

 * @summary Test of diagnostic command VM.classloaders

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 *          java.compiler

 *          java.management

 *          jdk.internal.jvmstat/sun.jvmstat.monitor

 * @run testng ClassLoaderHierarchyTest

 */

import org.testng.Assert;

import org.testng.annotations.Test;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.dcmd.CommandExecutor;

import jdk.test.lib.dcmd.JMXExecutor;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;

public class ClassLoaderHierarchyTest {

//+-- <bootstrap>

//      |

//      +-- "platform", jdk.internal.loader.ClassLoaders$PlatformClassLoader

//      |     |

//      |     +-- "app", jdk.internal.loader.ClassLoaders$AppClassLoader

//      |

//      +-- jdk.internal.reflect.DelegatingClassLoader

//      |

//      +-- "Kevin", ClassLoaderHierarchyTest$TestClassLoader

//      |

//      +-- ClassLoaderHierarchyTest$TestClassLoader

//            |

//            +-- "Bill", ClassLoaderHierarchyTest$TestClassLoader

    public void run(CommandExecutor executor) throws ClassNotFoundException {

        ClassLoader unnamed_cl = new TestClassLoader(null, null);

        Class<?> c1 = Class.forName("TestClass2", true, unnamed_cl);

        if (c1.getClassLoader() != unnamed_cl) {

            Assert.fail("TestClass defined by wrong classloader: " + c1.getClassLoader());

        }

        ClassLoader named_cl = new TestClassLoader("Kevin", null);

        Class<?> c2 = Class.forName("TestClass2", true, named_cl);

        if (c2.getClassLoader() != named_cl) {

            Assert.fail("TestClass defined by wrong classloader: " + c2.getClassLoader());

        }

        ClassLoader named_child_cl = new TestClassLoader("Bill", unnamed_cl);

        Class<?> c3 = Class.forName("TestClass2", true, named_child_cl);

        if (c3.getClassLoader() != named_child_cl) {

            Assert.fail("TestClass defined by wrong classloader: " + c3.getClassLoader());

        }

        // First test: simple output, no classes displayed

        OutputAnalyzer output = executor.execute("VM.classloaders");

        output.shouldContain("<bootstrap>");

        output.shouldMatch(".*TestClassLoader");

        output.shouldMatch("Kevin.*TestClassLoader");

        output.shouldMatch("Bill.*TestClassLoader");

        // Second test: print with classes.

        output = executor.execute("VM.classloaders show-classes");

        output.shouldContain("<bootstrap>");

        output.shouldContain("java.lang.Object");

        output.shouldMatch(".*TestClassLoader");

        output.shouldMatch("Kevin.*TestClassLoader");

        output.shouldMatch("Bill.*TestClassLoader");

        output.shouldContain("TestClass2");

    }

    static class TestClassLoader extends ClassLoader {

        public TestClassLoader() {

            super();

        }

        public TestClassLoader(String name, ClassLoader parent) {

            super(name, parent);

        }

        public static final String CLASS_NAME = "TestClass2";

        static ByteBuffer readClassFile(String name)

        {

            File f = new File(System.getProperty("test.classes", "."),

                              name);

            try (FileInputStream fin = new FileInputStream(f);

                 FileChannel fc = fin.getChannel())

            {

                return fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());

            } catch (IOException e) {

                Assert.fail("Can't open file: " + name, e);

            }

            /* Will not reach here as Assert.fail() throws exception */

            return null;

        }

        protected Class<?> loadClass(String name, boolean resolve)

            throws ClassNotFoundException

        {

            Class<?> c;

            if (!CLASS_NAME.equals(name)) {

                c = super.loadClass(name, resolve);

            } else {

                // should not delegate to the system class loader

                c = findClass(name);

                if (resolve) {

                    resolveClass(c);

                }

            }

            return c;

        }

        protected Class<?> findClass(String name)

            throws ClassNotFoundException

        {

            if (!CLASS_NAME.equals(name)) {

                throw new ClassNotFoundException("Unexpected class: " + name);

            }

            return defineClass(name, readClassFile(name + ".class"), null);

        }

    }

    @Test

    public void jmx() throws ClassNotFoundException {

        run(new JMXExecutor());

    }

}

class TestClass2 {

    static {

        Runnable r = () -> System.out.println("Hello");

        r.run();

    }

}