Match Method Parameter Types: AOP Spring Tutorial - Spring Framework Tutorial

Match Method Parameter Types: AOP Spring Tutorial is a free tutorial by Chad Darby from Spring Framework course
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English
Narrator: In this video, we're gonna discuss more about AOP pointcut expressions. And in particular we'll learn how to match on parameters for methods. So there's a parameter pattern that has a collection of wildcards that you can use. The first one here we've actually used before, it's basically the open param, close param, and this will actually match on a method with no arguments. So we've done this already using our add account examples. You can also make use of the open param star, close param, or asterisk. Basically matches a method with one argument of any type, so that's only one argument of any type. Then you can move down to the next one here of open param dot dot, close param. This will actually match on a method with zero to many arguments of any type. Alright so that's the basic layout here, and I'll show you some code examples on how these work and we'll also dive into eclipse later on after this lecture and we'll see some hands on coding, making use of some of these pattern wildcards for parameters. Alrighty, so let's go ahead and look at an example here of matching add account methods with no arguments. And as I mentioned we've seen this before already, but let's kinda review it and break it down since we now understand everything. So here I have my return type of star, meaning any return type, and then I have a method name of addAccount, and then I have simply open param, close param, so that's a parameter with no arguments. So if you've played around with this in some of the previous videos, you may have noticed if you added an argument or if you added a parameter to the method addAcccount, that things wouldn't work as you expect, and basically because open param close param says hey we're only gonna match on methods that have no arguments. But of course right we have some wildcards that we can make use of, and I'll show you how to do those a little later. Alrighty, now in this example here I'm gonna match on the add account method that has an account param. So I have a type of param I'm gonna pass in, and I want it to match on only that item. So here's my pointcut expression, again I have my return type of star, and then I have method add account, and now the new piece here is the actual param type, so I give the fully qualified class name of the account class. So this'll only match if you call in add account method and you pass in an account object. One more example here of matching on the add account methods with any number of arguments. So here you're saying alright we could have a lot of things being passed in, so here's our return type, our method, and then we'll make use of that wildcard pattern dot dot. So this'll match on zero to many arguments of any type. Then you can also set it up such that you only apply advices on a given package, or you match on a given package name. So in this example I'm gonna match on any method in our DAO package, com love to code AOP demo dot DAO. So only methods in this package, nowhere else in our system. Alright so here's our pointcut expression, I have my return type of star, match on anything, and then I give the actual package name that I want to match on. And then next I give the actual class of star, meaning any class, and for method I give star, any method, and then for param type I give dot dot meaning zero to many arguments as far as parameters of any type. So this pointcut expression will match on any method in our given DAO package. Alrighty so this looks really good, like we've done before, we're gonna go dive into eclipse, we're gonna write some code, and I'll also show you the happy path, I'll show you how everything works out just fine, and then on purp