Re: [abc-users] probability

I am sorry, I got the name wrong. The one I meant is
abc.weaving.residues.CheckType. But abc.weaving.residues.TestResidue
suits your needs maybe even better. Have a look at the codeGen methods
in there. They generate the code for the dynamic checks.

Eric

2009/4/7 Amjad Nusayr <anusayr_at_cs.nmsu.edu>:
> Eric,
> Can you tell me where could I find ThisResidue?? I cant seem to find in abc
> 1.3.
>
> Amjad
>
> Eric Bodden wrote:
>>
>> Ah, I see.
>>
>> In this case you should return neither AlwaysMatch nor NeverMatch but
>> instead a custom residue. This residue should insert some code:
>>
>> a) a call to the random-number generator
>> b) fetch the resuling boolean value and
>> c) return a reference to the local that holds this boolean.
>>
>> It may help to look at ThisResidue. That residue checks for the
>> dynamic runtime type of an object and enables/disables the advice
>> depending on this dynamic check. Your residue must do something
>> similar.
>>
>> Eric
>>
>> 2009/4/4 Amjad Nusayr <anusayr_at_cs.nmsu.edu>:
>>
>>>
>>> NO man its not that. Its how could make my extension generate random
>>> numbers
>>> at runtime!!
>>> I have to make my self more clear. In my residue  I AlwaysMatch shadows
>>> within a certain probability.
>>>
>>> public Residue optimize() {
>>>     probGenerated=generator.nextInt(100)+1;
>>>     if (probGenerated<=prob)
>>>     {                    return AlwaysMatch.v();
>>>     }
>>>     else
>>>         return NeverMatch.v();
>>>  }
>>>
>>> This give me a problem of having the same shadows every time I run my
>>> program. I want the random shadow match generation to be at runtime.
>>> I hope I'm more clear this time.
>>>
>>> I know to generate random numbers. I first did that in MSX Basic when I
>>> 10
>>> years old :-)
>>>
>>> Amjad
>>>
>>> Eric Bodden wrote:
>>>
>>>>
>>>> So you are asking how to generate random numbers at runtime?
>>>>
>>>> Simply insert a call to...
>>>>
>>>> http://java.sun.com/j2se/1.4.2/docs/api/java/util/Random.html
>>>>
>>>> Hope that helps
>>>>
>>>> 2009/4/4 Amjad Nusayr <anusayr_at_cs.nmsu.edu>:
>>>>
>>>>
>>>>>
>>>>> I thought I knew how to generate random numbers at runtime. BUT I dont.
>>>>> How
>>>>> can make my aspect (or my extension) generate random numbers every time
>>>>> I
>>>>> run my code. I created a probability PC but generates random numbers at
>>>>> compile time. This does not what I wanted cause it means I'm executes
>>>>> the
>>>>> same sites over and over again.
>>>>>
>>>>> Amjad
>>>>>
>>>>> Eric Bodden wrote:
>>>>>
>>>>>
>>>>>>
>>>>>> Still, you should probably try this first and then you can still
>>>>>> change it later if required.
>>>>>>
>>>>>> When you generate random numbers at runtime, then all you need to do
>>>>>> is create a dynamic residue that returns the result of a call to some
>>>>>> function "shouldExecute()". This function should return a random
>>>>>> boolean.
>>>>>>
>>>>>> Eric
>>>>>>
>>>>>> 2009/3/31 Amjad Nusayr <anusayr_at_cs.nmsu.edu>:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>
>>>>>>> I thought of that, but that means more overhead time at runtime.
>>>>>>> Thats
>>>>>>> why I
>>>>>>> wanted to generate the trace when compiling.
>>>>>>>
>>>>>>> Amjad
>>>>>>>
>>>>>>>
>>>>>>> Eric Bodden wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>
>>>>>>>> Hi Amjad. Why don't you compute the random number at runtime? That
>>>>>>>> would be way easier than storing it in a trace. Would that work for
>>>>>>>> you?
>>>>>>>>
>>>>>>>> Eric
>>>>>>>>
>>>>>>>> 2009/3/31 Amjad Nusayr <anusayr_at_cs.nmsu.edu>:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>>
>>>>>>>>> Hello
>>>>>>>>> I want to design a PC called probability(p) i n which advice is
>>>>>>>>> woven
>>>>>>>>> at
>>>>>>>>> each joinpoint but is executed only with P probability. My main
>>>>>>>>> concern
>>>>>>>>> here
>>>>>>>>> is that a dynamic check is needed to create this action. To check
>>>>>>>>> the
>>>>>>>>> probability I want to pre-compute a "trace" of random numbers, then
>>>>>>>>> just
>>>>>>>>> pull the next unused number out of the trace. There are two things
>>>>>>>>> I
>>>>>>>>> need
>>>>>>>>> to
>>>>>>>>> ask of. First, How can I create this dynamic check? Second. How can
>>>>>>>>> I
>>>>>>>>> get
>>>>>>>>> the trace of random numbers to be a part of my generated code?
>>>>>>>>>
>>>>>>>>> Thanks
>>>>>>>>> Amjad
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>>
>>
>
>
>

-- 
Eric Bodden
Sable Research Group, McGill University
Montréal, Québec, Canada