org.springframework.cglib.core.ClassLoaderAwareGeneratorStrategy Maven / Gradle / Ivy
/*
* Copyright 2002-2019 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.springframework.cglib.core;
/**
* CGLIB GeneratorStrategy variant which exposes the application ClassLoader
* as current thread context ClassLoader for the time of class generation.
* The ASM ClassWriter in Spring's ASM variant will pick it up when doing
* common superclass resolution.
*
* @author Juergen Hoeller
* @since 5.2
*/
public class ClassLoaderAwareGeneratorStrategy extends DefaultGeneratorStrategy {
private final ClassLoader classLoader;
public ClassLoaderAwareGeneratorStrategy(ClassLoader classLoader) {
this.classLoader = classLoader;
}
@Override
public byte[] generate(ClassGenerator cg) throws Exception {
if (this.classLoader == null) {
return super.generate(cg);
}
Thread currentThread = Thread.currentThread();
ClassLoader threadContextClassLoader;
try {
threadContextClassLoader = currentThread.getContextClassLoader();
}
catch (Throwable ex) {
// Cannot access thread context ClassLoader - falling back...
return super.generate(cg);
}
boolean overrideClassLoader = !this.classLoader.equals(threadContextClassLoader);
if (overrideClassLoader) {
currentThread.setContextClassLoader(this.classLoader);
}
try {
return super.generate(cg);
}
finally {
if (overrideClassLoader) {
// Reset original thread context ClassLoader.
currentThread.setContextClassLoader(threadContextClassLoader);
}
}
}
}