enjoy 4.3 release ^_^
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James
181
src/main/java/com/jfinal/template/expr/ast/FastFieldGetter.java
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181
src/main/java/com/jfinal/template/expr/ast/FastFieldGetter.java
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@@ -0,0 +1,181 @@
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package com.jfinal.template.expr.ast;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import com.jfinal.kit.StrKit;
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import com.jfinal.proxy.ProxyClassLoader;
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/**
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* 使用 jfinal proxy 机制消除 java.lang.reflect.Method.invoke(...)
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* 提升性能，并且同时支持动态类型的 field 表达式取值
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*/
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public class FastFieldGetter extends FieldGetter {
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protected static ProxyGenerator generator = new ProxyGenerator();
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protected static ProxyCompiler compiler = new ProxyCompiler();
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protected static ProxyClassLoader classLoader = new ProxyClassLoader();
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protected static Map<Class<?>, Proxy> cache = new ConcurrentHashMap<>(512, 0.25F);
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protected static boolean outputCompileError = false;
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protected Proxy proxy;
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protected java.lang.reflect.Method getterMethod;
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public FastFieldGetter(Proxy proxy, java.lang.reflect.Method getterMethod) {
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this.proxy = proxy;
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this.getterMethod = getterMethod;
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}
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/**
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* 仅用于配置 Engine.addFieldGetter(0, new FastFieldGetter());
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*/
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public FastFieldGetter() {
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this(null, null);
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}
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public FieldGetter takeOver(Class<?> targetClass, String fieldName) {
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if (MethodKit.isForbiddenClass(targetClass)) {
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throw new RuntimeException("Forbidden class: " + targetClass.getName());
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}
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String getterName = "get" + StrKit.firstCharToUpperCase(fieldName);
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java.lang.reflect.Method[] methodArray = targetClass.getMethods();
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for (java.lang.reflect.Method method : methodArray) {
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if (method.getName().equals(getterName) && method.getParameterCount() == 0) {
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Proxy proxy = cache.get(targetClass);
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if (proxy == null) {
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synchronized (targetClass) {
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proxy = cache.get(targetClass);
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if (proxy == null) {
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try {
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proxy = createProxy(targetClass, fieldName);
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} catch (Throwable e) {
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return null;
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}
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cache.putIfAbsent(targetClass, proxy);
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}
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}
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}
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return new FastFieldGetter(proxy, method);
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}
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}
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return null;
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}
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public Object get(Object target, String fieldName) throws Exception {
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// return getterMethod.invoke(target, ExprList.NULL_OBJECT_ARRAY);
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return proxy.getValue(target, fieldName);
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}
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protected Proxy createProxy(Class<?> targetClass, String fieldName) {
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ProxyClass proxyClass = new ProxyClass(targetClass);
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String sourceCode = generator.generate(proxyClass);
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// System.out.println(sourceCode);
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proxyClass.setSourceCode(sourceCode);
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compiler.compile(proxyClass);
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Class<?> retClass = classLoader.loadProxyClass(proxyClass);
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proxyClass.setClazz(retClass);
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try {
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return (Proxy)retClass.newInstance();
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} catch (ReflectiveOperationException e) {
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throw new RuntimeException(e);
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}
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}
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public String toString() {
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return getterMethod.toString();
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}
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// ---------
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/**
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* 代理接口
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*/
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public static interface Proxy {
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public Object getValue(Object target, String fieldName);
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}
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// ---------
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/**
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* 代理类
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*/
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static class ProxyClass extends com.jfinal.proxy.ProxyClass {
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private String name; // 类名
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public ProxyClass(Class<?> target) {
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super(target);
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name = target.getSimpleName() + "$$EnhancerByJFinal_FieldGetter";
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}
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public String getName() {
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return name;
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}
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}
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// ---------
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/**
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* 代理生成器
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*/
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static class ProxyGenerator {
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String generate(ProxyClass proxyClass) {
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StringBuilder ret = new StringBuilder(1024);
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Class<?> targetClass = proxyClass.getTarget();
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String className = proxyClass.getName();
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ret.append("package ").append(proxyClass.getPkg()).append(";\n\n");
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ret.append("import com.jfinal.template.expr.ast.FastFieldGetter.Proxy;\n\n");
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ret.append("public class ").append(className).append(" implements Proxy {\n\n");
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ret.append("\tpublic Object getValue(Object target, String fieldName) {\n");
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ret.append("\t\tint hash = fieldName.hashCode();\n");
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ret.append("\t\tswitch (hash) {\n");
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java.lang.reflect.Method[] methodArray = targetClass.getMethods();
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for (java.lang.reflect.Method method : methodArray) {
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String mn = method.getName();
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if (method.getParameterCount() == 0 && mn.startsWith("get") && (!mn.equals("getClass"))) {
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String fieldName = StrKit.firstCharToLowerCase(mn.substring(3));
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ret.append("\t\tcase ").append(fieldName.hashCode()).append(" :\n");
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ret.append("\t\t\treturn ((").append(targetClass.getName()).append(")target).").append(mn).append("();\n");
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}
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}
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ret.append("\t\tdefault :\n");
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ret.append("\t\t\tthrow new RuntimeException(\"Can not access the field \\\"\" + target.getClass().getName() + \".\" + fieldName + \"\\\"\");\n");
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ret.append("\t\t}\n");
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ret.append("\t}\n");
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ret.append("}\n");
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return ret.toString();
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}
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}
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// ---------
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public static void setOutputCompileError(boolean outputCompileError) {
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FastFieldGetter.outputCompileError = outputCompileError;
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}
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/**
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* 代理编译器
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*/
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static class ProxyCompiler extends com.jfinal.proxy.ProxyCompiler {
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@Override
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protected void outputCompileError(Boolean result, javax.tools.DiagnosticCollector<javax.tools.JavaFileObject> collector) {
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if (outputCompileError) {
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super.outputCompileError(result, collector);
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}
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}
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}
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}
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@@ -68,7 +68,7 @@ public class FieldGetters {
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String getterName = "get" + StrKit.firstCharToUpperCase(fieldName);
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java.lang.reflect.Method[] methodArray = targetClass.getMethods();
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for (java.lang.reflect.Method method : methodArray) {
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if (method.getName().equals(getterName) && method.getParameterTypes().length == 0) {
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if (method.getName().equals(getterName) && method.getParameterCount() == 0) {
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// if (MethodKit.isForbiddenMethod(getterName)) {
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// throw new RuntimeException("Forbidden method: " + getterName);
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// }
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@@ -115,7 +115,7 @@ public class FieldGetters {
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String isMethodName = "is" + StrKit.firstCharToUpperCase(fieldName);
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java.lang.reflect.Method[] methodArray = targetClass.getMethods();
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for (java.lang.reflect.Method method : methodArray) {
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if (method.getName().equals(isMethodName) && method.getParameterTypes().length == 0) {
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if (method.getName().equals(isMethodName) && method.getParameterCount() == 0) {
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Class<?> returnType = method.getReturnType();
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if (returnType == Boolean.class || returnType == boolean.class) {
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return new IsMethodFieldGetter(method);
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@@ -33,10 +33,14 @@ public abstract class FieldKeyBuilder {
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}
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/**
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* 设置为官方提供的 FastFieldKeyBuilder 实现，性能更高
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* 开启 FastFieldKeyBuilder，性能更高
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*/
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public static void setToFastFieldKeyBuilder() {
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instance = new FastFieldKeyBuilder();
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public static void setFastFieldKeyBuilder(boolean enable) {
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if (enable) {
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instance = new FastFieldKeyBuilder();
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} else {
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instance = new StrictFieldKeyBuilder();
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}
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}
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/**
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@@ -140,6 +140,36 @@ public class FieldKit {
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public static void clearCache() {
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fieldGetterCache.clear();
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}
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/**
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* 设置极速模式
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*
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* 极速模式将生成代理对象来消除 java.lang.reflect.Method.invoke(...) 调用，
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* 性能提升 12.9%
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*/
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public static synchronized void setFastMode(boolean fastMode) {
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if (fastMode) {
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if ( !contains(FastFieldGetter.class) ) {
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addFieldGetterToFirst(new FastFieldGetter());
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}
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} else {
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if (contains(FastFieldGetter.class)) {
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removeFieldGetter(FastFieldGetter.class);
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}
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}
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}
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/**
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* 判断是否包含某个 FieldGetter
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*/
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public static boolean contains(Class<? extends FieldGetter> fieldGetterClass) {
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for (FieldGetter fg : getters) {
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if (fg.getClass() == fieldGetterClass) {
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return true;
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}
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}
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return false;
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}
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}
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