Hi
I am newbie to aspectj and have a question regarding to the usage of parameters
exposed in the pointcut, advice, etc. Following is the source code:
package aspectj;
public aspect P{
public pointcut p(String command): execution(*
example.A.execute(String)) && args(command);
Object around(String command): p(command){
System.out.println("around() advice : command:"+command);
return proceed(command);
}
}
package example;
public class A{
public void execute(String c){
System.out.println("[A.java][execute] command:"+c);
}
}
package example;
public class Main{
public static void main(String args[]){
new Main().process();
}
void process(){
new A().execute("ls -alh");
}
}
The output :
around() advice : command:ls -alh
[A.java][execute] command:ls -alh
Thought I can get the code worked, I do not know how to explain the parameter
exposed in the pointcut (e.g. p(String command)) and advice (e.g. around(String
command)).
What I understand is that
Since the execution flow is
new A().execute("ls -lah") [Main.java] -> public void execute(String c) [A.java]
therefore, execution of the method `new A().execute("ls -alh")' triggers the
around() advice, which passes in a value `ls -lah' (as the variable command).
That value `ls -alh' passes to pointcut p(), which also takes a variable named
command. And that pointcut p() tries to capture the execution of a method
specified as `* example.A.execute(String)' and its argument must be `command.'
Is this explanation correct?
I found out there is something not right for me, but I am not aware the part
that I do not understand.
I appreciate any advice.
Thank you very much.
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