[rules-users] addKnowledgePackages Delay

Moe Alkhafaji moe.alkhafaji at medcpu.com
Mon May 3 10:55:25 EDT 2010 

Is there maybe a way to add those KnowledgePackages at startup time  
but somehow make them "hidden" and then just activate them when the KP  
needs to be available for execution and hiding it again (not available  
for execution) when they need to be unloaded?

Thanks.

Sent from my iPhone

On May 3, 2010, at 9:36 AM, Moe Alkhafaji <moe.alkhafaji at medcpu.com>  
wrote:

> I see. Thanks Rajnikant. I appreciate the assistance. I hope there  
> would be a way to maybe make this more internal to the KnowledgeBase  
> object itself, or define another object for this type of caching  
> instead of creating this complexity outside. Does anyone have  
> another approach? Or is it basically that everyone is "putting" up  
> with the delays of adding a new KnowledgePackage to an existing  
> KnowledgeBase? Thanks.
>
> 2010/5/3 Rajnikant Gupta <capricorn.raj at gmail.com>
> As I said earlier It may or may not be relevant in your case.  
> Usually caching improves performance significantly in drools.
>
>  In case of our application it does so by a very significant factor.
>
> Regards,
>
> Rajnikant Gupta
> http://rkthinks.wordpress.com/
>
>
> 2010/5/3 Moe Alkhafaji <moe.alkhafaji at medcpu.com>
> Hmmm, so you are suggesting I keep caches all possible combinations  
> of KnowledgePackages? If I have 100 possible KnowledgePackages and  
> they are loaded and unloaded dynamically that means I will have to  
> have 100 choose n where n goes from 1 to 100. That will make me go  
> out of memory easy no?
>
> Thanks.
>
> Sent from my iPhone
>
> On May 3, 2010, at 2:07 AM, Rajnikant Gupta  
> <capricorn.raj at gmail.com> wrote:
>
>> It may look something like this:
>>
>> Map knowledgeBaseCacheMap = new HashMap();
>>
>> this.knowledgeBase = knowledgeBaseCacheMap.get("<SOME_IDENTIFIER>");
>>
>> if(this.knowledgeBase == null){
>>    this.knowledgeBase.addKnowledgePackages(packages);
>>    knowledgeBaseCacheMap.put("<SOME_IDENTIFIER>", this.knowledgeBase)
>> }
>>
>> By doing this the packages get added to the knowledgeBase only for  
>> the first time. From second request onwards you get the same  
>> knowledgeBase each time without the need for adding the packages  
>> again.
>>
>> But this is valid only if you are not changing your rules. If your  
>> rules are changing from time to time, you may have to look at  
>> caching at more lower levels.
>>
>> I am not sure whether this can be helpful in your case but this is  
>> often helpful.
>>
>>
>> Regards,
>>
>> Rajnikant Gupta
>> http://rkthinks.wordpress.com/
>>
>>
>> 2010/5/3 Moe Alkhafaji <moe.alkhafaji at medcpu.com>
>> Thanks for the reply. But I don't understand what you mean by  
>> caching the KnowledgeBase. This is about adding a pre compiled  
>> KnowledgePackage to a KnowledgeBase. So, how does caching a  
>> KnowledgeBase makes addition of new KnowledgePackage faster? Please  
>> excuse my ignorance if I am not catching what you are suggesting.  
>> Maybe a couple of lines of code to demonstrate your suggestion  
>> would be greatly appreciated. Thanks.
>>
>> Sent from my iPhone
>>
>> On May 3, 2010, at 1:24 AM, Rajnikant Gupta  
>> <capricorn.raj at gmail.com> wrote:
>>
>>> Hi,
>>>
>>> Yes, adding packages to knowledgeBase does take some time. You can  
>>> probably try caching your knowledgeBase. By doing this all, but  
>>> first, requests should be significantly fast.
>>>
>>>
>>>
>>>
>>> Regards,
>>>
>>> Rajnikant Gupta
>>>
>>> http://rkthinks.wordpress.com/
>>>
>>>
>>> On Mon, May 3, 2010 at 11:36 AM, malkhafaji <moe.alkhafaji at medcpu.com 
>>> > wrote:
>>>
>>> Hello,
>>>
>>> I am trying to add knowledge packages to an existing  
>>> KnowledgeBase. My
>>> largest DRL file has 110 rules. I noticed that it may take up to 5  
>>> seconds
>>> just to execute the following statement:
>>>
>>> this.knowledgeBase.addKnowledgePackages(packages);
>>>
>>> where "packages" is just a list of one knowledge package  
>>> representing one
>>> drl. The nature of my rules is that I initially load a small set  
>>> of rules
>>> and then at runtime my rules may load other DRLs. The problem is  
>>> each DRL
>>> loading command (this.knowledgeBase.addKnowledgePackages 
>>> (packages)) takes a
>>> few seconds and I have no idea why. Although, all those DRLs are  
>>> already
>>> compiled (at startup time). It is the line I pasted above that  
>>> takes the
>>> longest time out of anything else I do.
>>>
>>> Any idea why just merely adding a KnowledgePackage list to a  
>>> KnowledgeBase
>>> can take this much time? Do you guys have any suggestions on how I  
>>> can
>>> reduce this time? I tried to create another dummy KnowledgeBase  
>>> and get the
>>> KnowledgePackage from it at runtime and add that to my  
>>> KnowedgeBase above
>>> (thinking that would reduce the time maybe), but not at all.
>>>
>>> Any ideas would be great. The API does not have much info on what  
>>> that add
>>> method exactly does behind the scenes, and how I can get around  
>>> the long
>>> delays. This is very frustrating to me, and I am not sure where to  
>>> look.
>>> Thanks for ANY help at all.
>>> --
>>> View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/addKnowledgePackages-Delay-tp772574p772574.html
>>> Sent from the Drools - User mailing list archive at Nabble.com.
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> -- 
> Moe Alkhafaji
> Chief Technology Officer, MedCPU
> Phone: (630) 290-1113
> Email: cto at medcpu.com
>
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