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ByteBuddyMockFactory.java
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ByteBuddyMockFactory.java
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/*
* Copyright 2023 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://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.
*/
package org.spockframework.mock.runtime;
import net.bytebuddy.ByteBuddy;
import net.bytebuddy.TypeCache;
import net.bytebuddy.description.modifier.SynchronizationState;
import net.bytebuddy.description.modifier.SyntheticState;
import net.bytebuddy.description.modifier.Visibility;
import net.bytebuddy.dynamic.Transformer;
import net.bytebuddy.dynamic.loading.ClassInjector;
import net.bytebuddy.dynamic.loading.ClassLoadingStrategy;
import net.bytebuddy.dynamic.scaffold.TypeValidation;
import net.bytebuddy.implementation.FieldAccessor;
import net.bytebuddy.implementation.MethodDelegation;
import net.bytebuddy.implementation.bind.annotation.Morph;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.VisibleForTesting;
import org.spockframework.mock.ISpockMockObject;
import org.spockframework.mock.codegen.Target;
import org.spockframework.util.Nullable;
import java.lang.reflect.Method;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ThreadLocalRandom;
import static net.bytebuddy.matcher.ElementMatchers.any;
import static net.bytebuddy.matcher.ElementMatchers.none;
class ByteBuddyMockFactory {
/**
* The size of the {@link #cacheLocks}.
* <p>Caution: This must match the {@link #CACHE_LOCK_MASK}.
*/
private static final int CACHE_LOCK_SIZE = 16;
/**
* The mask to use to mask out the {@link TypeCache.SimpleKey#hashCode()} to find the {@link #cacheLocks}.
* <p>Caution: this must match the bits of the {@link #CACHE_LOCK_SIZE}.
*/
private static final int CACHE_LOCK_MASK = 0x0F;
/**
* This array contains {@link TypeCachingLock} instances, which are used as java monitor locks for
* {@link TypeCache#findOrInsert(ClassLoader, Object, Callable, Object)}.
* The {@code cacheLocks} spreads the lock to acquire over multiple locks instead of using a single lock
* {@code CACHE} for all {@code TypeCache.SimpleKeys}.
*
* <p>Note: We can't simply use the mockedType class lock as a lock,
* because the {@link TypeCache.SimpleKey}, will be the same for different {@code mockTypes + additionalInterfaces}.
* See the hashcode implementation of the {@code TypeCache.SimpleKey}, which has {@code Set} semantics.
*/
private static final TypeCachingLock[] cacheLocks;
private static final TypeCache<TypeCache.SimpleKey> CACHE =
new TypeCache.WithInlineExpunction<>(TypeCache.Sort.SOFT);
private static final Class<?> CODEGEN_TARGET_CLASS = Target.class;
private static final String CODEGEN_PACKAGE = CODEGEN_TARGET_CLASS.getPackage().getName();
static {
cacheLocks = new TypeCachingLock[CACHE_LOCK_SIZE];
for (int i = 0; i < CACHE_LOCK_SIZE; i++) {
cacheLocks[i] = new TypeCachingLock();
}
}
static Object createMock(final Class<?> type,
final List<Class<?>> additionalInterfaces,
@Nullable List<Object> constructorArgs,
IProxyBasedMockInterceptor interceptor,
final ClassLoader classLoader,
boolean useObjenesis) {
TypeCache.SimpleKey key = new TypeCache.SimpleKey(type, additionalInterfaces);
Class<?> enhancedType = CACHE.findOrInsert(classLoader,
key,
() -> {
String typeName = type.getName();
Class<?> targetClass = type;
if (shouldLoadIntoCodegenPackage(type)) {
typeName = CODEGEN_PACKAGE + "." + type.getSimpleName();
targetClass = CODEGEN_TARGET_CLASS;
}
int randomNumber = Math.abs(ThreadLocalRandom.current().nextInt());
String name = String.format("%s$%s$%d", typeName, "SpockMock", randomNumber);
ClassLoadingStrategy<ClassLoader> strategy = determineBestClassLoadingStrategy(targetClass);
return new ByteBuddy()
.with(TypeValidation.DISABLED) // https://github.com/spockframework/spock/issues/776
.ignore(none())
.subclass(type)
.name(name)
.implement(additionalInterfaces)
.implement(ISpockMockObject.class)
.method(any())
.intercept(MethodDelegation.withDefaultConfiguration()
.withBinders(Morph.Binder.install(ByteBuddyInvoker.class))
.to(ByteBuddyInterceptorAdapter.class))
.transform(Transformer.ForMethod.withModifiers(SynchronizationState.PLAIN, Visibility.PUBLIC)) // Overridden methods should be public and non-synchronized.
.implement(ByteBuddyInterceptorAdapter.InterceptorAccess.class)
.intercept(FieldAccessor.ofField("$spock_interceptor"))
.defineField("$spock_interceptor", IProxyBasedMockInterceptor.class, Visibility.PRIVATE, SyntheticState.SYNTHETIC)
.make()
.load(classLoader, strategy)
.getLoaded();
}, getCacheLockForKey(key));
Object proxy = MockInstantiator.instantiate(type, enhancedType, constructorArgs, useObjenesis);
((ByteBuddyInterceptorAdapter.InterceptorAccess) proxy).$spock_set(interceptor);
return proxy;
}
/**
* Returns a {@link TypeCachingLock}, which locks the {@link TypeCache#findOrInsert(ClassLoader, Object, Callable, Object)}.
*
* @param key the key to lock
* @return the {@link TypeCachingLock} to use to lock the {@link TypeCache}
*/
private static TypeCachingLock getCacheLockForKey(TypeCache.SimpleKey key) {
int hashCode = key.hashCode();
// Try to spread some higher bits with XOR to lower bits, because we only use lower bits.
hashCode = hashCode ^ (hashCode >>> 16);
int index = hashCode & CACHE_LOCK_MASK;
return cacheLocks[index];
}
@VisibleForTesting
static void clearAllCaches() {
CACHE.clear();
}
// This method and the ones it calls are inspired by similar code in Mockito's SubclassBytecodeGenerator
private static boolean shouldLoadIntoCodegenPackage(Class<?> type) {
return isComingFromJDK(type) || isComingFromSignedJar(type) || isComingFromSealedPackage(type);
}
private static boolean isComingFromJDK(Class<?> type) {
// Try to read Implementation-Title entry from manifest which isn't present in every JDK JAR
return type.getPackage() != null && "Java Runtime Environment".equalsIgnoreCase(type.getPackage().getImplementationTitle())
|| type.getName().startsWith("java.")
|| type.getName().startsWith("javax.");
}
private static boolean isComingFromSealedPackage(Class<?> type) {
return type.getPackage() != null && type.getPackage().isSealed();
}
private static boolean isComingFromSignedJar(Class<?> type) {
return type.getSigners() != null;
}
@NotNull
private static ClassLoadingStrategy<ClassLoader> determineBestClassLoadingStrategy(Class<?> targetClass) throws Exception {
if (ClassInjector.UsingLookup.isAvailable()) {
Class<?> methodHandlesClass = Class.forName("java.lang.invoke.MethodHandles");
Class<?> lookupClass = Class.forName("java.lang.invoke.MethodHandles$Lookup");
Method lookupMethod = methodHandlesClass.getMethod("lookup");
Method privateLookupInMethod = methodHandlesClass.getMethod("privateLookupIn", Class.class, lookupClass);
Object lookup = lookupMethod.invoke(null);
Object privateLookup = privateLookupInMethod.invoke(null, targetClass, lookup);
return ClassLoadingStrategy.UsingLookup.of(privateLookup);
}
if (ClassInjector.UsingReflection.isAvailable()) {
return ClassLoadingStrategy.Default.INJECTION;
}
return ClassLoadingStrategy.Default.WRAPPER;
}
private static final class TypeCachingLock {
}
}