Hi, Alex
Actually I tried what you told me yesterday.
Today I happen to find that although the capitialized "LEON" is
successefully passed in constructor, but does not get set on the member
field.
I tried to add:
class MyObject(text: String) {
println("init:" + text)
def talk(): String = {
println(text)
text
}
}
output:
Start...
init:LEON
End...
leon
leon
which means the talk() method still use the original one instead of the
capitalized one.
I guess there must be something different for object construct for scala.
That's the reason I repost the thread on stackoverflow which I actually
hopping some scala guys could help.
Anyway, Thanks for your help and sorry for bothering you.
Leon
On Tue, Jun 10, 2014 at 2:01 PM, Alexander Kriegisch <
[email protected]> wrote:
> Read my answer again and apply my suggestions, please. Bind arguments via
> args() and be fine. If you do not bind them, there is no point in calling
> proceed with any parameters. That it works seems to be pure chance or even
> a regression rather than by design. Use the force, young Padawan.
>
>
> Am 10.06.2014 um 18:17 schrieb Leon Ma <[email protected]>:
>
> No lucky to get it work in scala.
>
> Here's my java version:
>
> public class AopTest {
>
> @Test
> public void test(){
> MyJob t = new MyJob("leon");
> String result = t.talk();
> System.out.println(result);
> Assert.assertEquals(result, "LEON");
> }
>
> }
>
>
> public class MyJob {
> private String text;
> public MyJob(String value){
> text = value;
> }
>
> public String talk(){
> System.out.println(text);
> return text;
> }
> }
>
> @Aspect
> public class MyJobAspect {
>
> @Around(value = "execution (com.leon.aop.MyJob.new(..))")
> public Object constructCP(ProceedingJoinPoint jp) throws Throwable {
> try {
> System.out.println("Start..");
> Object[] args = jp.getArgs();
> args[0] = args[0].toString().toUpperCase();
> return jp.proceed(args);
> } finally {
> System.out.println("End...");
> }
>
> }
>
> }
>
>
> The java version works well ( btw, the jp.getArgs() do return values)
>
>
> No idea why scala not works.
>
> Is there any work around? any point even before execution I can try?
>
>
> Thanks
>
> Leon
>
>
>
>
> On Tue, Jun 10, 2014 at 2:05 AM, Alexander Kriegisch <
> [email protected]> wrote:
>
>> > jp.proceed(text..toUpperCase)
>>
>> Sorry, typo. I mean text.toUpperCase, and probably you need to wrap that
>> into an Object[], i.e.
>>
>> jp.proceed(new Object[] { text..toUpperCase })
>>
>>
>>
>> Alexander Kriegisch schrieb am 10.06.2014 11:02:
>>
>> > Hello again, Leon.
>> >
>> > The Object[] returned by jp.getArgs() will not be passed on to
>> jp.proceed().
>> > You need to bind the parameter(s) you want to modify via args(), e.g.
>> like this
>> > (untested, I hope I got the Scala syntax right):
>> >
>> > @Around("execution (com.leon.aop.MyObject.new(String, ..)) &&
>> args(text)")
>> > def constructCP(jp: ProceedingJoinPoint, String text): Object = {
>> > try {
>> > println("Start...")
>> > jp.proceed(text..toUpperCase)
>> > } finally {
>> > println("End...")
>> > }
>> > }
>> >
>> > CAVEAT: If you manipulate parameters in subclass constructors this way,
>> they
>> > will not be passed on to base class constructors via super() calls due
>> to the
>> > execution order of
>> > - preinitialization(*.new())
>> > - initialization(*.new())
>> > - execution(*.new()).
>> >
>> > If you really want to catch the former two as well, you need and
>> around()
>> > advice on
>> > - call(*.new())
>> >
>> > For background information see my answer and its sample output on
>> > http://stackoverflow.com/a/15571384/1082681.
>> >
>> > Regards
>> > --
>> > Alexander Kriegisch
>> > http://scrum-master.de
>> >
>> >
>> > Leon Ma schrieb am 10.06.2014 10:10:
>> >
>> >> I've successfully used round advice to intercept input parameter for a
>> method.
>> >>
>> >>
>> >> However, it seems constructor does not work for me. Here're my test:
>> (It's in
>> >> scala, but should be easy to understand)
>> >>
>> >>
>> >> class MyObjectTest extends FlatSpecLike with Matchers {
>> >>
>> >>
>> >> "MyObjectAspect" should "work" in {
>> >>
>> >> val t = new MyObject("leon")
>> >>
>> >> val result = t.talk()
>> >>
>> >> println(result)
>> >>
>> >> result should be("LEON")
>> >>
>> >> }
>> >>
>> >> }
>> >>
>> >>
>> >> class MyObject(text: String) {
>> >>
>> >>
>> >> def talk(): String = {
>> >>
>> >> println("MyObject " + text)
>> >>
>> >> text
>> >>
>> >> }
>> >>
>> >> }
>> >>
>> >>
>> >> @Aspect
>> >>
>> >> class MyObjectAspect {
>> >>
>> >>
>> >> @Around(value = "execution (com.leon.aop.MyObject.new(..))")
>> >>
>> >> def constructCP(jp: ProceedingJoinPoint): Object = {
>> >>
>> >>
>> >> try {
>> >>
>> >> println("Start...")
>> >>
>> >> val args = jp.getArgs
>> >>
>> >> args(0) = args(0).toString.toUpperCase
>> >>
>> >> jp.proceed(args)
>> >>
>> >> } finally {
>> >>
>> >> println("End...")
>> >>
>> >> }
>> >>
>> >>
>> >> }
>> >>
>> >>
>> >> }
>> >>
>> >>
>> >> output:
>> >>
>> >>
>> >> Start...
>> >>
>> >> End...
>> >>
>> >> MyObject leon
>> >>
>> >> leon
>> >>
>> >>
>> >> "[leon]" was not equal to "[LEON]"
>> >>
>> >> org.scalatest.exceptions.TestFailedException: "[leon]" was not equal to
>> >> "[LEON]"
>> >>
>> >> at
>> >>
>> org.scalatest.MatchersHelper$.newTestFailedException(MatchersHelper.scala:160)
>> >>
>> >> at
>> >>
>> org.scalatest.Matchers$ShouldMethodHelper$.shouldMatcher(Matchers.scala:6141)
>> >>
>> >> at org.scalatest.Matchers$AnyShouldWrapper.should(Matchers.scala:6175)
>> >>
>> >> at
>> com.leon.aop.MyObjectTest$$anonfun$1.apply$mcV$sp(ConstructorTest.scala:18)
>> >>
>> >>
>> >> Anything wrong?
>> >>
>> >>
>> >> Thanks
>> >>
>> >>
>> >> Leon
>> >>
>> >>
>> >
>> _______________________________________________
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