| /* |
| * Copyright (c) 2010, 2013, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file, and Oracle licenses the original version of this file under the BSD |
| * license: |
| */ |
| /* |
| Copyright 2009-2013 Attila Szegedi |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are |
| met: |
| * Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| * Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| * Neither the name of the copyright holder nor the names of |
| contributors may be used to endorse or promote products derived from |
| this software without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
| PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
| BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package jdk.dynalink; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodHandles; |
| import java.lang.invoke.MethodHandles.Lookup; |
| import java.lang.invoke.MethodType; |
| import java.util.Objects; |
| import java.util.function.Supplier; |
| import jdk.dynalink.linker.ConversionComparator.Comparison; |
| import jdk.dynalink.linker.GuardedInvocation; |
| import jdk.dynalink.linker.GuardingDynamicLinker; |
| import jdk.dynalink.linker.LinkRequest; |
| import jdk.dynalink.linker.LinkerServices; |
| import jdk.dynalink.linker.MethodHandleTransformer; |
| |
| /** |
| * Default implementation of the {@link LinkerServices} interface. |
| */ |
| final class LinkerServicesImpl implements LinkerServices { |
| private static final ThreadLocal<SecureLookupSupplier> threadLookupSupplier = new ThreadLocal<>(); |
| |
| private final TypeConverterFactory typeConverterFactory; |
| private final GuardingDynamicLinker topLevelLinker; |
| private final MethodHandleTransformer internalObjectsFilter; |
| |
| /** |
| * Creates a new linker services object. |
| * |
| * @param typeConverterFactory the type converter factory exposed by the services. |
| * @param topLevelLinker the top level linker used by the services. |
| * @param internalObjectsFilter a method handle transformer that is supposed to act as the implementation of this |
| * services' {@link #filterInternalObjects(java.lang.invoke.MethodHandle)} method. |
| */ |
| LinkerServicesImpl(final TypeConverterFactory typeConverterFactory, |
| final GuardingDynamicLinker topLevelLinker, final MethodHandleTransformer internalObjectsFilter) { |
| this.typeConverterFactory = typeConverterFactory; |
| this.topLevelLinker = topLevelLinker; |
| this.internalObjectsFilter = internalObjectsFilter; |
| } |
| |
| @Override |
| public boolean canConvert(final Class<?> from, final Class<?> to) { |
| return typeConverterFactory.canConvert(from, to); |
| } |
| |
| @Override |
| public MethodHandle asType(final MethodHandle handle, final MethodType fromType) { |
| return typeConverterFactory.asType(handle, fromType); |
| } |
| |
| @Override |
| public MethodHandle getTypeConverter(final Class<?> sourceType, final Class<?> targetType) { |
| return typeConverterFactory.getTypeConverter(sourceType, targetType); |
| } |
| |
| @Override |
| public Comparison compareConversion(final Class<?> sourceType, final Class<?> targetType1, final Class<?> targetType2) { |
| return typeConverterFactory.compareConversion(sourceType, targetType1, targetType2); |
| } |
| |
| /** |
| * Used to marshal a checked exception out of Supplier.get() in getGuardedInvocation. |
| */ |
| private static class LinkerException extends RuntimeException { |
| private static final long serialVersionUID = 1L; |
| |
| public LinkerException(final Exception cause) { |
| super(null, cause, true, false); |
| } |
| } |
| |
| @Override |
| public GuardedInvocation getGuardedInvocation(final LinkRequest linkRequest) throws Exception { |
| try { |
| return getWithLookupInternal(() -> { |
| try { |
| return topLevelLinker.getGuardedInvocation(linkRequest, this); |
| } catch (final RuntimeException e) { |
| throw e; |
| } catch (final Exception e) { |
| throw new LinkerException(e); |
| } |
| }, linkRequest.getCallSiteDescriptor()); |
| } catch (final LinkerException e) { |
| throw (Exception)e.getCause(); |
| } |
| } |
| |
| @Override |
| public MethodHandle filterInternalObjects(final MethodHandle target) { |
| return internalObjectsFilter != null ? internalObjectsFilter.transform(target) : target; |
| } |
| |
| @Override |
| public <T> T getWithLookup(final Supplier<T> operation, final SecureLookupSupplier lookupSupplier) { |
| return getWithLookupInternal( |
| Objects.requireNonNull(operation, "action"), |
| Objects.requireNonNull(lookupSupplier, "lookupSupplier")); |
| } |
| |
| private static <T> T getWithLookupInternal(final Supplier<T> operation, final SecureLookupSupplier lookupSupplier) { |
| final SecureLookupSupplier prevLookupSupplier = threadLookupSupplier.get(); |
| final boolean differ = prevLookupSupplier != lookupSupplier; |
| if (differ) { |
| threadLookupSupplier.set(lookupSupplier); |
| } |
| try { |
| return operation.get(); |
| } finally { |
| if (differ) { |
| threadLookupSupplier.set(prevLookupSupplier); |
| } |
| } |
| } |
| |
| static Lookup getCurrentLookup() { |
| final SecureLookupSupplier lookupSupplier = threadLookupSupplier.get(); |
| if (lookupSupplier != null) { |
| return lookupSupplier.getLookup(); |
| } |
| return MethodHandles.publicLookup(); |
| } |
| } |