[rules-dev] Performance Question

[Greg Barton]

You only have to add one additional rule (the one that retracts unmatched Lines) but each of your existing rules will have to modify each Line matched to set "processed = true" 

--- On Fri, 10/17/08, hare ram <hare.bond at gmail.com> wrote:

> From: hare ram <hare.bond at gmail.com>
> Subject: Re: [rules-dev] Performance Question
> To: greg_barton at yahoo.com, "Rules Dev List" <rules-dev at lists.jboss.org>
> Date: Friday, October 17, 2008, 2:28 PM
> There is more to it ,but just to give an idea.
> 
> I thought about the idea you have given me, but just did
> not get an idea of
> how to implement
> 
> Say in the below rules itself
> 
> rule "IP Route File rule"
>     salience 2000
>     when
>         Line ( line matches
> "^.*\s+show\s+ip\s+route\s*$" )
>         Line ( line matches
> "^.*\s+dest\s+address\s*$ )
>         file : FileFinder()
> 
>     then
>         file.setFileType("ip route file");
>         drools.halt();
> end
> 
> 
> When I encounter a line  "show ip route" in  a
> file , I know that match
> occured. But how do I implement it
> 
> Did you mean I should  have  written a separate rule like
> 
> when
>         Line ( line matches
> "^.*\s+show\s+ip\s+route\s*$" )
> then
>       update (the above line with proceed==true )
> 
> 
> In that case will not explode the number of rules (50 * say
> 3 matches)
> 
> Thanks
> Shiva
> 
> 
> 
> 
> On Fri, Oct 17, 2008 at 3:20 PM, Greg Barton
> <greg_barton at yahoo.com> wrote:
> 
> > Are you sure you want to use rules for this?  If
> you're not going to do
> > analysis more complex than what you've described
> I'd say straight java is a
> > better option.
> >
> > That being said, this is one thing to try:
> >
> > 1) Add a "processed" property of type
> boolean to Line, default value false.
> > 2) Set processed = true on Lines that are matched
> > 3) Have a low salience rule (lower than all other
> rules that match a Line)
> > that matches a Line with processed == false and
> retracts it.  It must be low
> > enough priority so it fires after any other rules that
> could match the Line.
> >
> > --- On Fri, 10/17/08, hare ram
> <hare.bond at gmail.com> wrote:
> >
> > > From: hare ram <hare.bond at gmail.com>
> > > Subject: [rules-dev] Performance Question
> > > To: rules-dev at lists.jboss.org
> > > Date: Friday, October 17, 2008, 1:56 PM
> > > Hello all,
> > >
> > > This is the set of rules i have
> > >
> > > rule "IP Route File rule"
> > >     salience 2000
> > >     when
> > >         Line ( line matches
> > >
> "^.*\s+show\s+ip\s+route\s*$" )
> > >         Line ( line matches
> > > "^.*\s+dest\s+address\s*$ )
> > >         file : FileFinder()
> > >
> > >     then
> > >         file.setFileType("ip route
> file");
> > >         drools.halt();
> > > end
> > >
> > >
> > >
> > > All I am doing in rules is, I read each line from
> the given
> > > file, convert
> > > them into Line Objects and see if any of my
> > > rules matches. There are about 50 such rules,
> that will
> > > help me
> > > differentiate what kind of file is present in my
> input
> > > directory.
> > >
> > > The question I have , is there a way I can know
> if Line
> > > Object matched any
> > > of the rules ? If a Line Object is not matched by
> > > any of rules, I can just retract that object from
> the
> > > memory and prevent Out
> > > of Memory Exception if the file size is huge
> > >
> > > Thanks
> > > Shiva
> > > _______________________________________________
> > > rules-dev mailing list
> > > rules-dev at lists.jboss.org
> > >
> https://lists.jboss.org/mailman/listinfo/rules-dev
> >
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