[jboss-jira] [JBoss JIRA] Commented: (JBRULES-2240) True modify

[Geoffrey De Smet (JIRA)]

    [ https://jira.jboss.org/jira/browse/JBRULES-2240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12479646#action_12479646 ] 

Geoffrey De Smet commented on JBRULES-2240:
-------------------------------------------

This can potentially give a huge performance boost, especially in statefull environments.

One such case this the 2 accumulates in a single rule case:
<conan> when the first accumulate is updated
<conan> the second accumulate has it's memory wiped
<ge0ffrey> ouch
<conan> because the first one says I'm re-calcuating this
<conan> so go to any child nodes for all my propagations and remove them
<ge0ffrey> So drools doesn't detect that the second accumulate does not depend on the first? That there's no correlation?
<ge0ffrey> That the result of the first accumulate is not used in calculation for the second?
<conan> doesn't matter
<conan> it's a chain of tuples remember
<conan> if you break the parent
<conan> then everything below is retracted
<ge0ffrey> would true modify fix this?
<conan> think about it a second
<conan> it's a chain of tuples
<conan> the second, cannot exist without hte first
<conan> if I need to re-calculate the first
<conan> the nthe second cannot exist.
<conan> ge0ffrey: true modify will improve this, yes.
<ge0ffrey> because then the second would not need to be retracted if the first is modified
<conan> in true modify if the first one was true and contineus to be true
<conan> whiel it's evaluated
<conan> it doesn't destroy the second one
<ge0ffrey> unless its correlated
<conan> if hte first one is false
<conan> the second one will need to be destroyed

But there are many more cases where true modify can have huge impact on performance.

> True modify
> -----------
>
>                 Key: JBRULES-2240
>                 URL: https://jira.jboss.org/jira/browse/JBRULES-2240
>             Project: Drools
>          Issue Type: Feature Request
>      Security Level: Public(Everyone can see) 
>          Components: drools-core  (expert)
>    Affects Versions: 5.0.1.FINAL
>            Reporter: Geoffrey De Smet
>            Assignee: Mark Proctor
>             Fix For: 5.1.0.M1
>
>


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