jdk 1.6 新特性，集成Groovy, 性能很差

性能都是相对的，如果调用量不是很大的话，可以忽略，毕竟使用为主。groovy支持的语法还是很多的，灰常推荐，我这只是小实验罢了

代码执行如下：

	/**
	 * @param args
	 * @throws ScriptException 
	 */
	public static void main(String[] args) throws ScriptException {
		// TODO Auto-generated method stub
		ScriptEngineManager sem = new ScriptEngineManager();
		//sem.registerEngineName("frame", new FrameScriptEngineFactory());
		ScriptEngine engine = sem.getEngineByName("groovy");
		Bindings bindings = engine.getBindings(ScriptContext.ENGINE_SCOPE);
		bindings.put("tag", new TagImpl());
		bindings.put("bcontext", new BContext(9));
		bindings.put("account", 9);
		long s = System.currentTimeMillis();
		for(int i=0;i<10000;i++){
			Object result = engine.eval("tag.hasTag(account)");
			Object result1 = engine.eval("tag.hasTag(account)");
			Object result2 = engine.eval("tag.isManager(bcontext)"); 
		}
		System.out.println(System.currentTimeMillis()-s);
		//No cache 234 203 187
		//cache 125 141 141 125
		//groovy 2375 1796 1719
	}

这是我测试的结果，使用反射与使用groovy的差距。
其实反射没有大家想像的这么慢， 反射缓存Method后，性能可以提升差不多2倍.

这个测试我实现了自己的ScriptEngineFactory,并使用jdk的反射机制与Groovy进行对比。

package org.miniframe.modules.script;

import javax.script.ScriptEngine;

/** 
 *  this is a factory to product ScriptEngine.
 */
public class FrameScriptEngineFactory extends AbstractScriptEngineFactory {

	@Override
	public String getEngineName() {
		return "frame";
	}

	@Override
	public String getEngineVersion() {
		return "1.0";
	}
 
	@Override
	public ScriptEngine getScriptEngine() { 
		FrameScriptEngine framese = new FrameScriptEngine(this); 
		return framese;
	}

}

package org.miniframe.modules.script;

import java.io.Reader;

import javax.script.AbstractScriptEngine;
import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptException;

public class FrameScriptEngine extends AbstractScriptEngine{
	
	private FrameScriptEngineFactory framesef;
	
	public FrameScriptEngine(FrameScriptEngineFactory framesef){
		super();
		this.framesef=framesef; 
	} 
	
	@Override
	public ScriptEngineFactory getFactory() { 
		return framesef;
	}


	/**
	 * 
	 * 1. first compile script to compileScript
	 * 2. execute compoleScript to get result.
	 */
	@Override
	public Object eval(String script, ScriptContext context)
			throws ScriptException {
		FrameCompilable compiled = new FrameCompilable();
		FrameCompiledScript compiledScript = (FrameCompiledScript) compiled.compile(script);
		return compiledScript.eval(context);
	}



	@Override
	public Object eval(Reader reader, ScriptContext context)
			throws ScriptException {
		// TODO Auto-generated method stub
		return null;
	}



	@Override
	public Bindings createBindings() {
		// TODO Auto-generated method stub
		return null;
	}

}

package org.miniframe.modules.script;

import java.io.Reader;
import java.util.HashMap;
import java.util.Map;

import javax.script.Compilable;
import javax.script.CompiledScript;
import javax.script.ScriptException;

public class FrameCompilable implements Compilable {
	
	private Map<String,CompiledScript> compiledCache = new HashMap<String,CompiledScript>();

	@Override
	public CompiledScript compile(String script) throws ScriptException {
		CompiledScript compiledScript = compiledCache.get(script);
		if(compiledScript!=null){
			return compiledScript;
		}else{
			FrameCompiledScript frameScript = new FrameCompiledScript();
			frameScript.compile(script); 
			compiledCache.put(script, frameScript);
			compiledScript = frameScript;
		}
		return compiledScript;
	}

	@Override
	public CompiledScript compile(Reader script) throws ScriptException {
		// TODO Auto-generated method stub
		return null;
	}

}

package org.miniframe.modules.script;

import javax.script.Bindings;
import javax.script.CompiledScript;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptException;

public class FrameCompiledScript extends CompiledScript {
	  
	private String script;
	private String target;
	private String method;
	private String[] args;
	 
	public String getTarget() {
		return target;
	}

	public void setTarget(String target) {
		this.target = target;
	}

	public String getMethod() {
		return method;
	}

	public void setMethod(String method) {
		this.method = method;
	}

	public String[] getArgs() {
		return args;
	}

	public void setArgs(String[] args) {
		this.args = args;
	}
	
	public void compile(String script){
		this.script=script;
		String[] fs = script.split("\\.");
		if(fs.length==2){
			String target = fs[0];
			String[] ss = fs[1].split("\\(");
			String method = ss[0];
			String[] args = ss[1].substring(0, ss[1].length()-1).split(",");
			setTarget(target);
			setMethod(method); 
			setArgs(args);
		}
	}

	@Override
	public Object eval(ScriptContext context) throws ScriptException {
		FrameInvocable invocable = new FrameInvocable(script);
		Bindings binding = context.getBindings(ScriptContext.ENGINE_SCOPE);
		Object[] objargs = new Object[args.length];
		for(int i=0;i<args.length;i++){
			Object objarg = binding.get(args[i]);
			objargs[i]=objarg;
		} 
		Object obj = null;
		try {
			obj = invocable.invokeMethod(binding.get(target), method, objargs);
		} catch (NoSuchMethodException e) {  
		}
		return obj;
	}

	@Override
	public ScriptEngine getEngine() {
		// TODO Auto-generated method stub
		return null;
	}

}

package org.miniframe.modules.script;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Map;

import javax.script.Invocable;
import javax.script.ScriptException;

public class FrameInvocable implements Invocable {

	private static Map<String, Method> methodCache = new HashMap<String, Method>();
	
	private boolean flag = true;

	private String script;

	public FrameInvocable(String script) {
		this.script = script;
	}
 
	@SuppressWarnings("rawtypes")
	@Override
	public Object invokeMethod(Object thiz, String name, Object... args)
			throws ScriptException, NoSuchMethodException {
		Method method = methodCache.get(script);
		Object re = null;
		if (method != null) {
			re = invoke(thiz, method, args);
		} else {
			Class[] parameterTypes = new Class[args.length];
			for (int i = 0; i < args.length; i++) {
				parameterTypes[i] = args[i].getClass();
			}
			method = getMethod(thiz, name, parameterTypes);
			if(flag){
				methodCache.put(script, method);
			}
			re = invoke(thiz, method, args);
		}

		return re;
	}

	/**
	 * search method from me and parents
	 * 
	 * @param target
	 * @param methodName
	 * @param args
	 * @return
	 */
	public static Method getMethod(Object target, String methodName,
			Class<?>... args) {
		Method method = null;
		try {
			for (Class<?> searchType = target.getClass(); searchType != Object.class; searchType = searchType
					.getSuperclass()) {
				method = searchType.getDeclaredMethod(methodName, args);
				if (method != null) {
					return method;
				}
			}
		} catch (SecurityException e) {
			throw e;
		} catch (NoSuchMethodException e) {
			throw new IllegalArgumentException("invalid:no method ["
					+ methodName + "] on target [" + target + "]", e);
		}
		return method;

	}

	/**
	 * invoke method
	 * 
	 * @param target
	 * @param method
	 * @param args
	 * @return
	 * @throws Throwable
	 */
	public static Object invoke(Object target, Method method, Object[] args) {
		try {
			if (!Modifier.isPublic(method.getModifiers())
					|| !Modifier.isPublic(method.getDeclaringClass()
							.getModifiers())) {
				method.setAccessible(true);
			}
			return method.invoke(target, args);
		} catch (InvocationTargetException ex) {
			throw new IllegalArgumentException(ex);
		} catch (IllegalArgumentException ex) {
			throw new IllegalArgumentException(
					"invalid: tried calling method [" + method
							+ "] on target [" + target + "]", ex);
		} catch (IllegalAccessException ex) {
			throw new IllegalArgumentException("Could not access method ["
					+ method + "]", ex);
		}
	}

	@Override
	public Object invokeFunction(String name, Object... args)
			throws ScriptException, NoSuchMethodException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public <T> T getInterface(Class<T> clasz) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public <T> T getInterface(Object thiz, Class<T> clasz) {
		// TODO Auto-generated method stub
		return null;
	}

}