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add cache

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Looly 2021-11-19 00:32:51 +08:00
parent 9a756eb4b1
commit 6ed8588c83
2 changed files with 25 additions and 20 deletions
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3
CHANGELOG.md
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@ -3,7 +3,7 @@
-------------------------------------------------------------------------------------------------------------
# 5.7.17 (2021-11-18)
# 5.7.17 (2021-11-19)
### 🐣新特性
* 【core 】 增加AsyncUtil（pr#457@Gitee）
@ -18,6 +18,7 @@
* 【core 】 Opt增加部分方法（pr#459@Gitee）
* 【core 】 增加DefaultCloneable（pr#459@Gitee）
* 【core 】 CollStreamUtil增加是否并行的重载（pr#467@Gitee）
* 【core 】 ResourceClassLoader增加缓存（pr#1959@Github）
*
### 🐞Bug修复
* 【core 】 修复FileResource构造fileName参数无效问题（issue#1942@Github）

42
hutool-core/src/main/java/cn/hutool/core/lang/ResourceClassLoader.java
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@ -7,23 +7,21 @@ 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,lzpeng
* @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;
private final Map<String, Class<?>> cacheClassMap;
/**
* 构造
@ -34,36 +32,42 @@ 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<>();
this.cacheClassMap = new HashMap<>();
}
/**
* 增加需要加载的类资源
*
* @param resource 资源，可以是文件、流或者字符串
* @return this
*/
public ResourceClassLoader<T> addResource(T resource){
public ResourceClassLoader<T> addResource(T resource) {
this.resourceMap.put(resource.getName(), resource);
return this;
}
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
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;
}
});
final Class<?> clazz = cacheClassMap.computeIfAbsent(name, this::defineByName);
if (clazz == null) {
throw new ClassNotFoundException(name);
return super.findClass(name);
}
return clazz;
}
/**
* 从给定资源中读取class的二进制流，然后生成类<br>
* 如果这个类资源不存在，返回{@code null}
*
* @param name 类名
* @return 定义的类
*/
private Class<?> defineByName(String name) {
final Resource resource = resourceMap.get(name);
if (null != resource) {
final byte[] bytes = resource.readBytes();
return defineClass(name, bytes, 0, bytes.length);
}
return null;
}
}