global.namespace.neuron.di.internal.Reflection8 Maven / Gradle / Ivy
/*
* Copyright © 2016 - 2019 Schlichtherle IT Services
*
* 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 global.namespace.neuron.di.internal;
import global.namespace.neuron.di.internal.proxy.Proxies;
import global.namespace.neuron.di.java.BreedingException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
class Reflection8 {
private Reflection8() {
}
private static final Method getClassLoadingLock, defineClass;
static {
final Class classLoaderClass = ClassLoader.class;
try {
getClassLoadingLock = classLoaderClass
.getDeclaredMethod("getClassLoadingLock", String.class);
getClassLoadingLock.setAccessible(true);
defineClass = classLoaderClass
.getDeclaredMethod("defineClass", String.class, byte[].class, int.class, int.class);
defineClass.setAccessible(true);
} catch (NoSuchMethodException e) {
throw new AssertionError(e);
}
}
@SuppressWarnings("unchecked")
static Class defineSubclass(final Class clazz, final String name, final byte[] b) {
final ClassLoader cl = classLoader(clazz);
try {
synchronized (getClassLoadingLock.invoke(cl, name)) {
return (Class) defineClass.invoke(cl, name, b, 0, b.length);
}
} catch (InvocationTargetException e) {
throw new BreedingException(e.getCause());
} catch (IllegalAccessException e) {
throw new AssertionError(e);
}
}
private static ClassLoader classLoader(final Class clazz) {
final ClassLoader cl = clazz.getClassLoader();
return null != cl ? cl : Proxies.CLASS_LOADER;
}
}