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Merge pull request #1959 from lzpeng723/v5-dev

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由于 FileObjectResource 的流不能读取多次，ResourceClassLoader 增加缓存,同一个类只能加载一次
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Golden Looly 2021-11-19 00:05:18 +08:00 committed by GitHub
commit 9a756eb4b1
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1 changed files with 23 additions and 6 deletions
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29
hutool-core/src/main/java/cn/hutool/core/lang/ResourceClassLoader.java
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@ -7,18 +7,24 @@ import cn.hutool.core.util.ObjectUtil;
import java.security.SecureClassLoader;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* 资源类加载器，可以加载任意类型的资源类
*
* @param <T> {@link Resource}接口实现类
* @author looly
* @author looly,lzpeng
* @since 5.5.2
*/
public class ResourceClassLoader<T extends Resource> extends SecureClassLoader {
private final Map<String, T> resourceMap;
/**
* 缓存已经加载的类
*/
private final Map<String, Class> cacheClassMap;
/**
* 构造
*
@ -28,6 +34,7 @@ public class ResourceClassLoader<T extends Resource> extends SecureClassLoader {
public ResourceClassLoader(ClassLoader parentClassLoader, Map<String, T> resourceMap) {
super(ObjectUtil.defaultIfNull(parentClassLoader, ClassLoaderUtil.getClassLoader()));
this.resourceMap = ObjectUtil.defaultIfNull(resourceMap, new HashMap<>());
this.cacheClassMap = new ConcurrentHashMap<>();
}
/**
@ -42,11 +49,21 @@ public class ResourceClassLoader<T extends Resource> extends SecureClassLoader {
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
final Resource resource = resourceMap.get(name);
if (null != resource) {
final byte[] bytes = resource.readBytes();
return defineClass(name, bytes, 0, bytes.length);
final Class<?> clazz = cacheClassMap.computeIfAbsent(name, className -> {
final Resource resource = resourceMap.get(name);
if (null != resource) {
final byte[] bytes = resource.readBytes();
return defineClass(name, bytes, 0, bytes.length);
}
try {
return super.findClass(name);
} catch (ClassNotFoundException e) {
return null;
}
});
if (clazz == null) {
throw new ClassNotFoundException(name);
}
return super.findClass(name);
return clazz;
}
}