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*
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/*
* 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
Licensed under both the Apache License, Version 2.0 (the "Apache License")
and the BSD License (the "BSD License"), with licensee being free to
choose either of the two at their discretion.
You may not use this file except in compliance with either the Apache
License or the BSD License.
If you choose to use this file in compliance with the Apache License, the
following notice applies to you:
You may obtain a copy of the Apache License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied. See the License for the specific language governing
permissions and limitations under the License.
If you choose to use this file in compliance with the BSD License, the
following notice applies to you:
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();
}
}