spring SimpleLoadTimeWeaver 源码
spring SimpleLoadTimeWeaver 代码
文件路径：/spring-context/src/main/java/org/springframework/instrument/classloading/SimpleLoadTimeWeaver.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.util.Assert;
import org.springframework.util.ClassUtils;
/**
* {@code LoadTimeWeaver} that builds and exposes a
* {@link SimpleInstrumentableClassLoader}.
*
* <p>Mainly intended for testing environments, where it is sufficient to
* perform all class transformation on a newly created
* {@code ClassLoader} instance.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @since 2.0
* @see #getInstrumentableClassLoader()
* @see SimpleInstrumentableClassLoader
* @see ReflectiveLoadTimeWeaver
*/
public class SimpleLoadTimeWeaver implements LoadTimeWeaver {
private final SimpleInstrumentableClassLoader classLoader;
/**
* Create a new {@code SimpleLoadTimeWeaver} for the current context
* {@code ClassLoader}.
* @see SimpleInstrumentableClassLoader
*/
public SimpleLoadTimeWeaver() {
this.classLoader = new SimpleInstrumentableClassLoader(ClassUtils.getDefaultClassLoader());
}
/**
* Create a new {@code SimpleLoadTimeWeaver} for the given
* {@code ClassLoader}.
* @param classLoader the {@code ClassLoader} to build a simple
* instrumentable {@code ClassLoader} on top of
*/
public SimpleLoadTimeWeaver(SimpleInstrumentableClassLoader classLoader) {
Assert.notNull(classLoader, "ClassLoader must not be null");
this.classLoader = classLoader;
}
@Override
public void addTransformer(ClassFileTransformer transformer) {
this.classLoader.addTransformer(transformer);
}
@Override
public ClassLoader getInstrumentableClassLoader() {
return this.classLoader;
}
/**
* This implementation builds a {@link SimpleThrowawayClassLoader}.
*/
@Override
public ClassLoader getThrowawayClassLoader() {
return new SimpleThrowawayClassLoader(getInstrumentableClassLoader());
}
}
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