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 
  26 package jdk.dynalink.test;
  27 
  28 import java.util.List;
  29 import jdk.dynalink.CallSiteDescriptor;
  30 import jdk.dynalink.linker.GuardingDynamicLinker;
  31 import jdk.dynalink.linker.GuardingDynamicLinkerExporter;
  32 import jdk.dynalink.linker.LinkRequest;
  33 import jdk.dynalink.linker.LinkerServices;
  34 
  35 /**
  36  * A trusted linker exporter (build file gives appropriate permission to the jar containing this class!).
  37  */
  38 public 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 }