Cglib 與 JDK動態(tài)代理的運行性能對比

本文格式為Word版，下載可任意編輯——Cglib與JDK動態(tài)代理的運行性能對比Cglib與JDK動態(tài)代理的運行性能比較

都說Cglib創(chuàng)立的動態(tài)代理的運行性能比JDK動態(tài)代理能高出大約10倍，今日抱著懷疑精神驗證了一下，發(fā)現(xiàn)狀況有所不同，遂貼出試驗結(jié)果，以供參考和探討。代碼很簡單，首先，定義一個Test接口，和一個實現(xiàn)TestImpl。Test接口僅定義一個方法test，對傳入的int參數(shù)加1后返回。代碼如下：

packagemy.test;

publicinterfaceTest{

publicinttest(inti);}

packagemy.test;

publicclassTestImplimplementsTest{publicinttest(inti){returni+1;}}

然后，定義了三種代理的實現(xiàn)：裝飾者模式實現(xiàn)的代理(decorator)，JDK動態(tài)代理(dynamicproxy)和Cglib動態(tài)代理(cglibproxy)。代碼如下：

packagemy.test;

publicclassDecoratorTestimplementsTest{privateTesttarget;

publicDecoratorTest(Testtarget){this.target=target;}

publicinttest(inti){returntarget.test(i);}}

packagemy.test;

importjava.lang.reflect.InvocationHandler;importjava.lang.reflect.Method;importjava.lang.reflect.Proxy;

publicclassDynamicProxyTestimplementsInvocationHandler{privateTesttarget;

privateDynamicProxyTest(Testtarget){this.target=target;}

publicstaticTestnewProxyInstance(Testtarget){return(Test)Proxy.newProxyInstance(DynamicProxyTest.class.getClassLoader(),newClass[]{Test.class},newDynamicProxyTest(target));

}

publicObjectinvoke(Objectproxy,Methodmethod,Object[]args)

throwsThrowable{

returnmethod.invoke(target,args);}}

packagemy.test;

importjava.lang.reflect.Method;

xy.Enhancer;

xy.MethodInterceptor;xy.MethodProxy;

publicclassCglibProxyTestimplementsMethodInterceptor{

privateCglibProxyTest(){}

publicstaticTestnewProxyInstance(ClasstargetInstanceClazz){Enhancerenhancer=newEnhancer();enhancer.setSuperclass(targetInstanceClazz);enhancer.setCallback(newCglibProxyTest());return(Test)enhancer.create();}

publicObjectintercept(Objectobj,Methodmethod,Object[]args,MethodProxyproxy)throwsThrowable{returnproxy.invokeSuper(obj,args);}}

以TestImpl的調(diào)用耗時作為基準(zhǔn)，對比通過其它三種代理進行調(diào)用的耗時。測試代碼如下：

packagemy.test;

importjava.util.LinkedHashMap;importjava.util.Map;

publicclassProxyPerfTester{

publicstaticvoidmain(String[]args){//創(chuàng)立測試對象；

TestnativeTest=newTestImpl();

Testdecorator=newDecoratorTest(nativeTest);

TestdynamicProxy=DynamicProxyTest.newProxyInstance(nativeTest);TestcglibProxy=CglibProxyTest.newProxyInstance(TestImpl.class);

//預(yù)熱一下；

intpreRunCount=10000;

runWithoutMonitor(nativeTest,preRunCount);runWithoutMonitor(decorator,preRunCount);runWithoutMonitor(cglibProxy,preRunCount);runWithoutMonitor(dynamicProxy,preRunCount);

//執(zhí)行測試；

Maptests=newLinkedHashMap();tests.put(\\nativeTest);tests.put(\decorator);

tests.put(\\dynamicProxy);tests.put(\\cglibProxy);intrepeatCount=3;

intrunCount=1000000;

runTest(repeatCount,runCount,tests);runCount=50000000;

runTest(repeatCount,runCount,tests);}

privatestaticvoidrunTest(intrepeatCount,intrunCount,Maptests){