TrustedGuardingDynamicLinkerExporter.java revision 1793:b4dca6350a46 
1/*
2 * Copyright (c) 2015, 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 jdk.dynalink.test;
27
28import java.util.List;
29import jdk.dynalink.CallSiteDescriptor;
30import jdk.dynalink.linker.GuardingDynamicLinker;
31import jdk.dynalink.linker.GuardingDynamicLinkerExporter;
32import jdk.dynalink.linker.LinkRequest;
33import jdk.dynalink.linker.LinkerServices;
34
35/**
36 * A trusted linker exporter (build file gives appropriate permission to the jar containing this class!).
37 */
38public final class TrustedGuardingDynamicLinkerExporter extends GuardingDynamicLinkerExporter {
39
40    private static final ThreadLocal<CallSiteDescriptor> lastDescriptor = new ThreadLocal<>();
41    private static boolean enabled = false;
42
43    public static void enable() {
44        reset(true);
45    }
46
47    public static void disable() {
48        reset(false);
49    }
50    public static boolean isLastCallSiteDescriptor(final CallSiteDescriptor desc) {
51        return lastDescriptor.get() == desc;
52    }
53
54    private static void reset(final boolean enable) {
55        lastDescriptor.set(null);
56        enabled = enable;
57    }
58
59    @Override
60    public List<GuardingDynamicLinker> get() {
61        return List.of(((GuardingDynamicLinker) (final LinkRequest linkRequest, final LinkerServices linkerServices) -> {
62            if (enabled) {
63                lastDescriptor.set(linkRequest.getCallSiteDescriptor());
64            }
65            return null;
66        }));
67    }
68}
69