Basic Usage

define struct

typeAuthstruct {}func (p*Auth)Login(userName,passwordstring)bool {ifuserName=="zeal"&&password=="gogap" {returntrue}returnfalse}// use join point to get Args from real methodfunc (p*Auth)Before(jp aop.JoinPointer) {username:=""jp.Args().MapTo(func(u,pstring) {username=u})fmt.Printf("Before Login: %s\n",username)}// the args is same as Loginfunc (p*Auth)After(username,passwordstring) {fmt.Printf("After Login: %s %s\n",username,password)}// use join point to around the real func of loginfunc (p*Auth)Around(pjp aop.ProceedingJoinPointer) {fmt.Println("@Begin Around")ret:=pjp.Proceed("fakeName","fakePassword")ret.MapTo(func(loginResultbool) {fmt.Println("@Proceed Result is",loginResult)})fmt.Println("@End Around")}

func (p*Auth)Login(userNamestring,passwordstring)bool {p.Before(userName,password)deferp.After(userName,password)ifuserName=="zeal"&&password=="gogap" {returntrue}returnfalse}

Step 1: Define Beans factory

beanFactory:=aop.NewClassicBeanFactory()beanFactory.RegisterBean("auth",new(Auth))

Step 2: Define Aspect

aspect:=aop.NewAspect("aspect_1","auth")aspect.SetBeanFactory(beanFactory)

Step 3: Define Pointcut

pointcut:=aop.NewPointcut("pointcut_1").Execution(`Login()`)aspect.AddPointcut(pointcut)

Step 4: Add Advice

aspect.AddAdvice(&aop.Advice{Ordering:aop.Before,Method:"Before",PointcutRefID:"pointcut_1"})aspect.AddAdvice(&aop.Advice{Ordering:aop.After,Method:"After",PointcutRefID:"pointcut_1"})aspect.AddAdvice(&aop.Advice{Ordering:aop.Around,Method:"Around",PointcutRefID:"pointcut_1"})

Step 5: Create AOP

gogapAop:=aop.NewAOP()gogapAop.SetBeanFactory(beanFactory)gogapAop.AddAspect(aspect)

Setp 6: Get Proxy

proxy,err:=gogapAop.GetProxy("auth")

Last Step: Enjoy

login:=proxy.Method(new(Auth).Login).(func(string,string)bool)("zeal","gogap")fmt.Println("login result:",login)

$> go run main.goBefore Login: zealAfter Login: zeal gogapLogin result:true

Advance

Pointcut expression

pointcut:=aop.NewPointcut("pointcut_1")// will trigger the advice while call loginpointcut.Execution(`Login()`)// will trigger the advice will call any funcpointcut.Execution(`.*?`)// will not trigger the advice will call any funcpointcut.NotExecution(`Login()`)

other conditions:

// will trigger the advie while we call Login// and in bean named authpointcut.Execution(`Login()`).Bean(`auth`)// will trigger the advie while we call Login// and in bean named auth and sysAuthpointcut.Execution(`Login()`).Bean(`auth`).Bean(`sysAuth`)// will trigger the advie while we call Login// and in bean named auth not sysAuthpointcut.Execution(`Login()`).Bean(`auth`).NotBean(`sysAuth`)// will trigger the advie while we call Login// and the call stacktrace should contain example/aop/mainpointcut.Execution(`Login()`).WithIn(`example/aop/main`)

Do not want to assertion func type

proxy.Invoke(new(Auth).Login,"zeal","errorpassword").End(func(resultbool) {login=result})

Weaving other beans into aspect

define a bean

typeFoostruct {}// @AfterReturning, the method could have args of aop.Result,// it will get the result from real func return valuesfunc (p*Foo)Bar(result aop.Result) {result.MapTo(func(vbool) {fmt.Println("Bar Bar Bar .... Result is:",v)})}

register bean

beanFactory.RegisterBean("foo",new(Foo))

create aspect

aspectFoo:=aop.NewAspect("aspect_2","foo")aspectFoo.SetBeanFactory(beanFactory)

add advice

aspectFoo.AddAdvice(&aop.Advice{Ordering:aop.AfterReturning,Method:"Bar",PointcutRefID:"pointcut_1"})

add aspect into aop

gogapAop.AddAspect(aspectFoo)

Before Login: zealBar Bar Bar .... Result is:trueAfter Login: zeal gogapLogin result:true

Turn on trace for debug

err:=aop.StartTrace()....// use proxy to call your funcst,err:=aop.StopTrace()for_,item:=ranget.Items() {fmt.Println(item.ID,item.InvokeID,item.BeanRefID,item.Pointcut,item.Method)}

$> go run main.gogo run main.go==========Func Type Assertion==========Before Login: zeal@Begin Around@Login fakeName fakePassword@Proceed Result isfalse@End AroundAfter Login: zeal gogapLogin result:false================Invoke=================Before Login: zeal@Begin Around@Login fakeName fakePassword@Proceed Result isfalse@End AroundAfter Login: zeal errorpasswordLogin result:false1 aqpk3jjhssa5ul6pt0h0 auth main.(Auth).Login Before2 aqpk3jjhssa5ul6pt0h0 auth main.(Auth).Login Around3 aqpk3jjhssa5ul6pt0h0 auth main.(Auth).Login*Login4 aqpk3jjhssa5ul6pt0h0 foo main.(Auth).Login Bar5 aqpk3jjhssa5ul6pt0h0 auth main.(Auth).Login After6 aqpk3jjhssa5ul6pt0hg auth main.(Auth).Login Before7 aqpk3jjhssa5ul6pt0hg auth main.(Auth).Login Around8 aqpk3jjhssa5ul6pt0hg auth main.(Auth).Login*Login9 aqpk3jjhssa5ul6pt0hg foo main.(Auth).Login Bar10 aqpk3jjhssa5ul6pt0hg auth main.(Auth).Login After