[jira] Resolved: (AXIS2-3421) An algorithum to determine the phase order

["Amila Chinthaka Suriarachchi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AXIS2-3421?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Amila Chinthaka Suriarachchi resolved AXIS2-3421.
-------------------------------------------------

    Resolution: Won't Fix

no need to apply this change

> An algorithum to determine the phase order 
> -------------------------------------------
>
>                 Key: AXIS2-3421
>                 URL: https://issues.apache.org/jira/browse/AXIS2-3421
>             Project: Axis2
>          Issue Type: Improvement
>          Components: deployment
>            Reporter: Amila Chinthaka Suriarachchi
>         Attachments: dynamic_phase2.tar
>
>
> This algorithm users a simplified logical model to determine the phase
> order of a given set of phases with phase rules.
> Following description is only based on the after and before rules for
> simplicity. Sample shows how it can integrate with phaseFirst and phaseLast rules
> as well.
> 1. This algorithum only works with before rules. i.e after is also consider
> as a before rule.
> eg. if <A before="B" after="C"/>
> we assume this equals to
>     <A before="B"/> and <C before="A"/>
> 2. A seperate list called before phases list is used to keep the before phases
> of a given phase. This detail is used to validate a rule and relocate a phase.
> eg. for above case here is the before lists
> <C before="A,B"/>
> <A before="B"/>
> <B before=""/>
> before list of any phase is clearly a subset of phases below it.
> One phase by one phase added to the final phase order list. At any time this
> phase order list contains a valid phase order according to the known phase rules.
> So all phases has their before list as specified by the rules.
> PsudoCode for adding a Phase (A).
> // phase A only have a before rule. if original rule has an after rule then
> // we add another rule using the first law
> if A already exists
>     // if a exists then validate it with before and after phases
>     if before phase rule given (B)
>         if before phase exists
>             // if the before phase already in the system, we have to add this rule to the
>             // system i.e update the before lists
>             Add B's phases to A and all the other phases having A in their before list.
>             Relocate B if it already not after A (see the relocate procedure below)
>         else
>             // before phase not in the system
>             Add before phase as the last phase
>             Add before phase to A and all the other phases having A in their before list.
> else
>     // i.e if A does not exists in the system
>     if before phase rule given (B)
>         if before phase exists
>             Place A just before the B
>             Add all B's phases to the As' before list.
>         else
>             // if there is no before phase
>             Add the before phase to end of the list
>             Place A just before B
>             Add all B's phases to the As' before list
>     else
>       //i.e no before rule is given. then we can safely place this at the end
>       Add A to end of phase order
>  So this method would keep the list in the with the orignal condition and hence
>  we can keep on adding phases
>  Relocate Algorithum
>  Relocate Phase A
>  Go through the phase order list until find a phase belongs to before list.
>  // this means we have to insert this phase at lest before this point (i).
>  // As mentioned earlier before list of a phase must be a subset of phase below it
>  // so all the phases below this point (i) can not have A as a before list phase
>  Check whether below phase contain A as a before list phase
>     if exits throw an exception
>     else insert A at the i th position.

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