JESS: JSR-94 and JessListener

[Henschel, Jörg]

I'm trying to use Jess in a JSR-94 environment, as described in the Jess documentation. Am I right to assume that currently there is no way to attach JessListeners to the underlying Rete object?

The JSR-94 API doesn't specify anything in that regard and short of fiddling with jess.jsr94.RuleServiceProviderImpl itself, I don't see a way to add event listeners.

So - if I want event handling, I can't use the javax.rules API?

Thank you for any insights here,
Jörg Henschel



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[Peter Lin]

unfortunately, JSR94 is very limited and isn't worth the hassle. it's
really there so that vendors can check off "JSR94" from their list.

JSR94 really has no value, so just use JESS API directly.

peter


2009/5/8 Henschel, Jörg <J.Henschel@...>:

> I'm trying to use Jess in a JSR-94 environment, as described in the Jess documentation. Am I right to assume that currently there is no way to attach JessListeners to the underlying Rete object?
>
> The JSR-94 API doesn't specify anything in that regard and short of fiddling with jess.jsr94.RuleServiceProviderImpl itself, I don't see a way to add event listeners.
>
> So - if I want event handling, I can't use the javax.rules API?
>
> Thank you for any insights here,
> Jörg Henschel
>
>
>
> --------------------------------------------------------------------
> To unsubscribe, send the words 'unsubscribe jess-users you@...'
> in the BODY of a message to majordomo@..., NOT to the list
> (use your own address!) List problems? Notify owner-jess-users@...

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[Wolfgang Laun-2]

Harsh words have been said about JSR-94, which I won't repeat here.

One advice to give here is that you might design your own interface to
maintain potential portability to some other rule based system.

-W


2009/5/8 Henschel, Jörg <J.Henschel@...>

> I'm trying to use Jess in a JSR-94 environment, as described in the Jess
> documentation. Am I right to assume that currently there is no way to attach
> JessListeners to the underlying Rete object?
>
> The JSR-94 API doesn't specify anything in that regard and short of
> fiddling with jess.jsr94.RuleServiceProviderImpl itself, I don't see a way
> to add event listeners.
>
> So - if I want event handling, I can't use the javax.rules API?
>
> Thank you for any insights here,
> Jörg Henschel
>
>
>
> --------------------------------------------------------------------
> To unsubscribe, send the words 'unsubscribe jess-users you@...'
> in the BODY of a message to majordomo@..., NOT to the list
> (use your own address!) List problems? Notify owner-jess-users@...

[Ernest Friedman-Hill]

The Jess language function "(engine)" returns the Rete object that the  
Jess code is executing in, so you should be able to use that. If you  
used a minimal amount of Jess code to store that engine reference  
someplace, then you could do the reset of your listener registration  
from Java code.



On May 8, 2009, at 7:21 AM, Henschel, Jörg wrote:

> I'm trying to use Jess in a JSR-94 environment, as described in the  
> Jess documentation. Am I right to assume that currently there is no  
> way to attach JessListeners to the underlying Rete object?
>
> The JSR-94 API doesn't specify anything in that regard and short of  
> fiddling with jess.jsr94.RuleServiceProviderImpl itself, I don't see  
> a way to add event listeners.
>
> So - if I want event handling, I can't use the javax.rules API?
>
> Thank you for any insights here,
> Jörg Henschel
>
>

---------------------------------------------------------
Ernest Friedman-Hill
Informatics & Decision Sciences          Phone: [phone]
Sandia National Labs
PO Box 969, MS 9012                            ejfried@...
Livermore, CA 94550                             http://www.jessrules.com





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[Peter Lin]

writing your own rule engine wrapper is simple, so that is definitely
a better solution than using JSR94.

I've done that several times since 2000.

On Fri, May 8, 2009 at 9:59 AM, Wolfgang Laun <wolfgang.laun@...> wrote:

> Harsh words have been said about JSR-94, which I won't repeat here.
>
> One advice to give here is that you might design your own interface to
> maintain potential portability to some other rule based system.
>
> -W
>
>
> 2009/5/8 Henschel, Jörg <J.Henschel@...>
>
>> I'm trying to use Jess in a JSR-94 environment, as described in the Jess
>> documentation. Am I right to assume that currently there is no way to attach
>> JessListeners to the underlying Rete object?
>>
>> The JSR-94 API doesn't specify anything in that regard and short of
>> fiddling with jess.jsr94.RuleServiceProviderImpl itself, I don't see a way
>> to add event listeners.
>>
>> So - if I want event handling, I can't use the javax.rules API?
>>
>> Thank you for any insights here,
>> Jörg Henschel
>>
>>
>>
>> --------------------------------------------------------------------
>> To unsubscribe, send the words 'unsubscribe jess-users you@...'
>> in the BODY of a message to majordomo@..., NOT to the list
>> (use your own address!) List problems? Notify owner-jess-users@...

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[Henschel, Jörg]

Thank you for your input, I suspected as much. Personally, I'm not too convinced of the JSR-94 usefulness either, but I just wanted to be clear on some of the restrictions it would impose.

- Joerg

-----Ursprüngliche Nachricht-----
Von: owner-jess-users@... [mailto:owner-jess-users@...] Im Auftrag von Wolfgang Laun
Gesendet: Freitag, 8. Mai 2009 16:00
An: jess-users@...
Betreff: Re: JESS: JSR-94 and JessListener

Harsh words have been said about JSR-94, which I won't repeat here.

One advice to give here is that you might design your own interface to
maintain potential portability to some other rule based system.

-W


2009/5/8 Henschel, Jörg <J.Henschel@...>

> I'm trying to use Jess in a JSR-94 environment, as described in the Jess
> documentation. Am I right to assume that currently there is no way to attach
> JessListeners to the underlying Rete object?
>
> The JSR-94 API doesn't specify anything in that regard and short of
> fiddling with jess.jsr94.RuleServiceProviderImpl itself, I don't see a way
> to add event listeners.
>
> So - if I want event handling, I can't use the javax.rules API?
>
> Thank you for any insights here,
> Jörg Henschel
>
>
>
> --------------------------------------------------------------------
> To unsubscribe, send the words 'unsubscribe jess-users you@...'
> in the BODY of a message to majordomo@..., NOT to the list
> (use your own address!) List problems? Notify owner-jess-users@...

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