141 lines
4.3 KiB
Java
141 lines
4.3 KiB
Java
/**
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* Copyright (c) 2011-2019, James Zhan 詹波 (jfinal@126.com).
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.jfinal.template.expr.ast;
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import com.jfinal.kit.HashKit;
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/**
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* MethodKeyBuilder
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*/
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public abstract class MethodKeyBuilder {
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/**
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* 生成指定 class、指定方法名、指定方法形参类型的 key 值，用于缓存
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*/
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public abstract Long getMethodKey(Class<?> targetClass, String methodName, Class<?>[] argTypes);
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// 默认使用 FastMethodKeyBuilder
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static MethodKeyBuilder instance = new FastMethodKeyBuilder();
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public static MethodKeyBuilder getInstance() {
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return instance;
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}
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/**
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* 切换到 StrictMethodKeyBuilder
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*
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* <pre>
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* 特别注意：
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* 如果希望将 configEngine(Engine me) 中的 Engine 切换到 StrictMethodKeyBuilder，
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* 需要在 YourJFinalConfig extends JFinalConfig 中利用如下代码块才能生效：
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* static {
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* MethodKeyBuilder.setToStrictMethodKeyBuilder();
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* }
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*
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* 原因是在 com.jfinal.core.Config 中 new Engine() 时 setToStrictMethodKeyBuilder()
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* 方法并未生效，所以 extension method 生成 method key 时仍然使用的是 FastMethodKeyBuilder
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* 以至于在运行时，使用 StrictMethodKeyBuilder 生成的 key 找不到 extension method
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*
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* 后续版本考虑在调用 setToStrictMethodKeyBuilder() 以后重新初始化一下 MethodKit 中的变量
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* 原先的 static 初始化方式重构出 synchronized void init() 方法来方便调用
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*
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* </pre>
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*/
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public static void setToStrictMethodKeyBuilder() {
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instance = new StrictMethodKeyBuilder();
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}
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/**
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* 切换到用户自定义 MethodKeyBuilder
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*/
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public static void setMethodKeyBuilder(MethodKeyBuilder methodKeyBuilder) {
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if (methodKeyBuilder == null) {
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throw new IllegalArgumentException("methodKeyBuilder can not be null");
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}
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instance = methodKeyBuilder;
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}
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/**
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* FastMethodKeyBuilder
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*
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* targetClass、methodName、argTypes 的 hash 直接使用 String.hashCode()
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* String.hashCode() 会被缓存，性能更好
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*/
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public static class FastMethodKeyBuilder extends MethodKeyBuilder {
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public Long getMethodKey(Class<?> targetClass, String methodName, Class<?>[] argTypes) {
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long hash = HashKit.FNV_OFFSET_BASIS_64;
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hash ^= targetClass.getName().hashCode();
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hash *= HashKit.FNV_PRIME_64;
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hash ^= methodName.hashCode();
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hash *= HashKit.FNV_PRIME_64;
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if (argTypes != null) {
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for (int i=0; i<argTypes.length; i++) {
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Class<?> type = argTypes[i];
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if (type != null) {
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hash ^= type.getName().hashCode();
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hash *= HashKit.FNV_PRIME_64;
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} else {
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hash ^= "null".hashCode();
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hash *= HashKit.FNV_PRIME_64;
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}
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}
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}
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return hash;
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}
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}
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/**
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* StrictMethodKeyBuilder
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*
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* targetClass、methodName、argTypes 三部分全部使用 fnv1a64 算法计算 hash
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*/
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public static class StrictMethodKeyBuilder extends MethodKeyBuilder {
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public Long getMethodKey(Class<?> targetClass, String methodName, Class<?>[] argTypes) {
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long hash = HashKit.FNV_OFFSET_BASIS_64;
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hash = fnv1a64(hash, targetClass.getName());
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hash = fnv1a64(hash, methodName);
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if (argTypes != null) {
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for (int i=0; i<argTypes.length; i++) {
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Class<?> type = argTypes[i];
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if (type != null) {
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hash = fnv1a64(hash, type.getName());
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} else {
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hash = fnv1a64(hash, "null");
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}
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}
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}
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return hash;
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}
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private long fnv1a64(long offsetBasis, String key) {
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long hash = offsetBasis;
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for(int i=0, size=key.length(); i<size; i++) {
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hash ^= key.charAt(i);
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hash *= HashKit.FNV_PRIME_64;
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}
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return hash;
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}
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}
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}
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