Re: [abc-users] probability

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
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>
>>>
>>>
>>>
>>
>>
>
>
>
>
Received on Tue Apr 07 2009 - 07:36:43 BST