spring SimpleInstrumentableClassLoader 源码
spring SimpleInstrumentableClassLoader 代码
文件路径：/spring-context/src/main/java/org/springframework/instrument/classloading/SimpleInstrumentableClassLoader.java
/*
* Copyright 2002-2017 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.instrument.classloading;
import java.lang.instrument.ClassFileTransformer;
import org.springframework.core.OverridingClassLoader;
import org.springframework.lang.Nullable;
/**
* Simplistic implementation of an instrumentable {@code ClassLoader}.
*
* <p>Usable in tests and standalone environments.
*
* @author Rod Johnson
* @author Costin Leau
* @since 2.0
*/
public class SimpleInstrumentableClassLoader extends OverridingClassLoader {
static {
ClassLoader.registerAsParallelCapable();
}
private final WeavingTransformer weavingTransformer;
/**
* Create a new SimpleInstrumentableClassLoader for the given ClassLoader.
* @param parent the ClassLoader to build an instrumentable ClassLoader for
*/
public SimpleInstrumentableClassLoader(@Nullable ClassLoader parent) {
super(parent);
this.weavingTransformer = new WeavingTransformer(parent);
}
/**
* Add a {@link ClassFileTransformer} to be applied by this ClassLoader.
* @param transformer the {@link ClassFileTransformer} to register
*/
public void addTransformer(ClassFileTransformer transformer) {
this.weavingTransformer.addTransformer(transformer);
}
@Override
protected byte[] transformIfNecessary(String name, byte[] bytes) {
return this.weavingTransformer.transformIfNecessary(name, bytes);
}
}
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