spring ThrowawayClassLoader 源码
spring ThrowawayClassLoader 代码
文件路径：/spring-core/graalvm/src/main/java/org/springframework/aot/graalvm/ThrowawayClassLoader.java
/*
* Copyright 2002-2022 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.aot.graalvm;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
/**
* {@link ClassLoader} used to load classes without causing build-time
* initialization.
*
* @author Phillip Webb
* @since 6.0
*/
class ThrowawayClassLoader extends ClassLoader {
static {
registerAsParallelCapable();
}
private final ClassLoader resourceLoader;
ThrowawayClassLoader(ClassLoader parent) {
super(parent.getParent());
this.resourceLoader = parent;
}
@Override
protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
synchronized (getClassLoadingLock(name)) {
Class<?> loaded = findLoadedClass(name);
if (loaded != null) {
return loaded;
}
try {
return super.loadClass(name, true);
}
catch (ClassNotFoundException ex) {
return loadClassFromResource(name);
}
}
}
private Class<?> loadClassFromResource(String name) throws ClassNotFoundException, ClassFormatError {
String resourceName = name.replace('.', '/') + ".class";
InputStream inputStream = this.resourceLoader.getResourceAsStream(resourceName);
if (inputStream == null) {
return null;
}
try {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
inputStream.transferTo(outputStream);
byte[] bytes = outputStream.toByteArray();
return defineClass(name, bytes, 0, bytes.length);
}
catch (IOException ex) {
throw new ClassNotFoundException("Cannot load resource for class [" + name + "]", ex);
}
}
@Override
protected URL findResource(String name) {
return this.resourceLoader.getResource(name);
}
}
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