can annotations add code?

[Timasmith]

Hi,

One thing that would be wonderful is if I could add an annotation say

@logthis
public void doSomething() {
int i=0;
i=10;
}

which inserted code into the beginning and end of the method such as

public void doSomething() {
startLogging("doSomething");
int i=0;
i=10;
stopLoggin("doSomething";
}

Do annotations come close to providing that?

thanks

 

[andrewmcdonagh]

Hi,

One thing that would be wonderful is if I could add an annotation say

@logthis
public void doSomething() {
int i=0;
i=10;

}which inserted code into the beginning and end of the method such as

public void doSomething() {
startLogging("doSomething");
int i=0;
i=10;
stopLoggin("doSomething";

}Do annotations come close to providing that?

thanks

No

 

[Wesley Hall]

Hi,

One thing that would be wonderful is if I could add an annotation say

@logthis
public void doSomething() {
int i=0;
i=10;
}

which inserted code into the beginning and end of the method such as

public void doSomething() {
startLogging("doSomething");
int i=0;
i=10;
stopLoggin("doSomething";
}

Do annotations come close to providing that?

No, but AOP does.

 

[Daniel Dyer]

Hi,

One thing that would be wonderful is if I could add an annotation say

@logthis
public void doSomething() {
int i=0;
i=10;
}

which inserted code into the beginning and end of the method such as

public void doSomething() {
startLogging("doSomething");
int i=0;
i=10;
stopLoggin("doSomething";
}

Do annotations come close to providing that?

You might want to look into Aspect Oriented Programming (AOP).

Dan.

 

[hiwa]

Do annotations come close to providing that?
Yes. You must be an apt expert to do that.

 

[Thomas Hawtin]

Yes. You must be an apt expert to do that.

APT can be used to generate new code. It does not alter existing code.

I'm sure there are plenty of AOP-style tools that will help, either
modifying the byte code of the .class files, modifying classes in a
custom class loader or using instrumentation APIs on loading the code.

Tom Hawtin

 

[Timasmith]

APT can be used to generate new code. It does not alter existing code.

I'm sure there are plenty of AOP-style tools that will help, either
modifying the byte code of the .class files, modifying classes in a
custom class loader or using instrumentation APIs on loading the code.

Tom Hawtin

Ok, I guess ideally the annotation would drive the AOP- tool, I'll look
into that.

 

[hiwa]

Ok, I guess ideally the annotation would drive the AOP- tool, I'll look
into that.

Some 'experts' on Java annotation are talking about ....
http://forum.java.sun.com/thread.jspa?threadID=739960&start=0&tstart=20
http://forum.java.sun.com/thread.jspa?threadID=735736&messageID=4227834#4227834

 

[Robert Klemme]

Hi,

One thing that would be wonderful is if I could add an annotation say

@logthis
public void doSomething() {
int i=0;
i=10;
}

which inserted code into the beginning and end of the method such as

public void doSomething() {
startLogging("doSomething");
int i=0;
i=10;
stopLoggin("doSomething";
}

Do annotations come close to providing that?

Others have answered that already. However, if you just want to trace
execution then there are plenty tools out there. These work either on
VM level or inside (limpy log or so).

robert