SharedSecrets.java revision 724:e7ddf972e152 
1/*
2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package sun.corba;
27
28import com.sun.corba.se.impl.io.ValueUtility;
29import jdk.internal.misc.Unsafe;
30
31import java.lang.reflect.Field;
32import java.security.AccessController;
33import java.security.PrivilegedAction;
34
35/** A repository of "shared secrets", which are a mechanism for
36    calling implementation-private methods in another package without
37    using reflection. A package-private class implements a public
38    interface and provides the ability to call package-private methods
39    within that package; the object implementing that interface is
40    provided through a third package to which access is restricted.
41    This framework avoids the primary disadvantage of using reflection
42    for this purpose, namely the loss of compile-time checking. */
43
44// SharedSecrets cloned in corba repo to avoid build issues
45public class SharedSecrets {
46    private static final Unsafe unsafe = getUnsafe();
47    private static JavaCorbaAccess javaCorbaAccess;
48
49     private static Unsafe getUnsafe() {
50          PrivilegedAction<Unsafe> pa = () -> {
51               Class<?> unsafeClass = jdk.internal.misc.Unsafe.class ;
52               try {
53                    Field f = unsafeClass.getDeclaredField("theUnsafe");
54                    f.setAccessible(true);
55                    return (Unsafe) f.get(null);
56               } catch (Exception e) {
57                    throw new Error(e);
58               }
59          };
60          return AccessController.doPrivileged(pa);
61     }
62
63    public static JavaCorbaAccess getJavaCorbaAccess() {
64        if (javaCorbaAccess == null) {
65            // Ensure ValueUtility is initialized; we know that that class
66            // provides the shared secret
67            unsafe.ensureClassInitialized(ValueUtility.class);
68        }
69        return javaCorbaAccess;
70    }
71
72    public static void setJavaCorbaAccess(JavaCorbaAccess access) {
73        javaCorbaAccess = access;
74    }
75
76}
77