c1ReadEdgeDiffLoader.java

/*
 * Copyright (c) 2015, Oracle and/or its affiliates. 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
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 */
package p1;

import java.lang.reflect.*;
import myloaders.MyDiffClassLoader;
import p2.c2;

public class c1ReadEdgeDiffLoader {
    public c1ReadEdgeDiffLoader() {
        // The goal is to establish a read edge between module m1
        // which is the module where p1.c1ReadEdgeDiffLoader is defined,
        // and the unnamed module that defines p2.c2.  This must be
        // done in 2 steps:
        //
        // Step #1: Establish a read edge between m1, where c1ReadEdgeDiffLoader
        //          is defined, and the System ClassLoader's unnamed module,
        //          where MyDiffClassLoader is defined. This read edge
        //          is needed before we can obtain MyDiffClassLoader.loader2's unnamed module.
        //
        // Step #2: Establish a read edge between m1, where c1ReadEdgeDiffLoader
        //          is defined, and the MyDiffClassLoader.loader2's unnamed module,
        //          where p2.c2 will be defined.

        // Step #1: read edge m1 -> System ClassLoader's unnamed module
        Module m1 = c1ReadEdgeDiffLoader.class.getModule();
        ClassLoader system_loader = ClassLoader.getSystemClassLoader();
        Module unnamed_module1 = system_loader.getUnnamedModule();
        m1.addReads(unnamed_module1);

        // Step #2: read edge m1 -> MyDiffClassLoader.loader2's unnamed module
        ClassLoader loader2 = MyDiffClassLoader.loader2;
        Module unnamed_module2 = loader2.getUnnamedModule();
        m1.addReads(unnamed_module2);

        // Attempt access - access should succeed since m1 can read
        //                  MyDiffClassLoader.loader2's unnamed module
        p2.c2 c2_obj = new p2.c2();
        c2_obj.method2();
    }
}