Re: [aspectj-users] How to trace a static method with varargs ?

[Andy Clement <andrew.clement@xxxxxxxxx>]

the pointcuts execution/call/etc take a method declaration signature -
so you need to specify the signature as it is declared.  This means
not:

call(Object[][] LibUtil,getResultSetBound(Connection, String, JdbcParm []))

but

call(Object[][] LibUtil,getResultSetBound(Connection, String, JdbcParm...))

(as Mohan has in his example).

The binding pointcuts like args/this/target use the runtime type, and
at runtime the varargs is represented as an array so you use the
JdbcParm[] in args binding.

This complete program compiles and weaves for me:

public aspect Ooo {

	pointcut traceGetSQLResultset(Connection dbConn, String sql,
JdbcParm[] values) :
	    call(Object[][] LibUtil.getSQLResultSetBound(Connection, String,
JdbcParm...)) &&
	    args(dbConn, sql, values);
	
	
	Object[][] around(Connection dbConn, String sql, JdbcParm[] values) :
	    traceGetSQLResultset(dbConn, sql, values) {
	    System.out.println(sql);
	    return proceed(dbConn, sql, values);
	}
	
	public static void main(String[] args) {
		LibUtil.getSQLResultSetBound(null,null);
	}
}

class LibUtil {
	public static Object[][] getSQLResultSetBound(Connection c,String s,
JdbcParm... jdbcParms) {
		return null;
	}
}

class Connection {}
class JdbcParm {}

Andy


On 18 May 2010 06:48, Roger Gilliar <roger@xxxxxxxxxx> wrote:
> Ok,
>
> after correcting my typo I'm now sure that JdbcParm [] doesn't match
> JdbcParm... values since I get a match if I change the signature of my
> method to getResultSetBound(final Connection dbConn, final String sql,
> JdbcParm[] values).
>
> The question remains: How do I write a pointcut for a method with varargs.
>
> Regards
>  Roger
>
>> I would like to trace the following method. But I can't figure out how to
>> handle the varargs:
>>
>> public  Object[][] getResultSetBound(final Connection dbConn, final String
>> sql, final JdbcParm... values) {
>>        return getResultSetBound(dbConn, sql, null, values);
>> }
>>
>> My aspect  is:
>>
>>    pointcut traceGetSQLResultset(Connection dbConn, String sql, JdbcParm[]
>> values) :
>>        call(Object[][] LibUtil,getResultSetBound(Connection, String,
>> JdbcParm [])) &&
>>        args(dbConn, sql, values);
>>
>>
>>    Object[][] around(Connection dbConn, String sql, JdbcParm[] values) :
>>        traceGetSQLResultset(dbConn, sql, values) {
>>        System.out.println(sql);
>>        return proceed(dbConn, sql, values);
>>    }
>>
>> But the advice is not applied.
>>
>> What I'm doing wrong ?
>>
>> Regards
>>  Roger
>> _______________________________________________
>> aspectj-users mailing list
>> aspectj-users@xxxxxxxxxxx
>> https://dev.eclipse.org/mailman/listinfo/aspectj-users
>
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