[taskjuggler] task order is relevant

From: Ernst Pfann (pfann_at_br-online.de)
Date: Mon Nov 24 2003 - 15:48:51 CET 

From: Ernst Pfann <pfann@br-online.de>
Date: Mon, 24 Nov 2003 15:48:51 +0100
Message-Id: <200311241548.51681.pfann@br-online.de>
Subject: [taskjuggler] task order is relevant

Hi,

I have seen a (i think) little bit strange behavior of taskjuggler. If i try
to compile this problem.tjp (see below), there is a error/warning about a
impossible dependency (with tj-version 1.9.0):

--------------------------------------------------------------------------
problem.tjp:18: Impossible dependency:
Task 'research.examine_software' starts at 2003-09-24-14:00:00-CEST but needs
to follow task research.get_software which has a 'plan' end time of
2003-09-30-14:59:59-CEST
problem.tjp:26: Impossible dependency:
Task 'research.get_software' ends at 2003-09-30-14:59:59-CEST but needs to
precede task 'research.examine_software' which has a 'plan' start time of
2003-09-24-14:00:00-CEST
--------------------------------------------------------------------------

But the problem is not what tj means. If i change the order of task
"maintanance" and task "research", the project compiles without any problems
and the report matches exactly what i want. It compiles as well if i comment
in the priority-line in task "maintanance".

The logic seams to be clear: if there is no priority (=500), the order is
relevant.

The question is: why can't tj resolve this problem.
Ok - this may be a little tricky. But it should be possible, to get better
warnings.

This was really a problem - because this is just a very small part of our
tj-plan, automatically build by perl-scripts. And it costs me a lot of time
to find out, why (the hell) this thing compiles at one time and at another
time don't.

------- problem.tjp ------------------------------------------------------
project test "Test" "$Header$" 2003-09-01 2003-12-31-23:59

resource EP "Ernst Pfann"

task maintanance "Wartung"
{
    #priority 300
    start 2003-09-01
    end 2003-12-31
    allocate EP { load 0.13 }
    responsible EP
}

task research "Suchen"
{
        task get_software "App besorgen"
        {
                effort 2d
                allocate EP
                depends !milestones.start
                complete 100
        }
        
        task examine_software "App untersuchen und einschaetzen"
        {
                effort 3d
                allocate EP
                depends !get_software
                precedes !milestones.end
                complete 100
        }
        
        task milestones "Meilensteine"
        {
                task start "Project start"
                {
                        milestone
                        start 2003-09-23
                }
                task end "Project end"
                {
                        milestone
                        start 2003-09-30
                }
        }
}

htmltaskreport "problem.html"
{
        headline "A Problem"
        loadunit shortauto
        columns no,
                        name,
                        status,
                        completed { title "in %" },
                        effort { title "von" },
                        weekly,
                        start,
                        end
        sorttasks plancompletedup
        timeformat "%d.%m.%y"
}
--------------------------------------------------------------------------

Best regards,
Ernst Pfann 

-- 
Bayerischer Rundfunk                          Rundfunkplatz 1, D-80300 München
Tel: +49 89 5900-16016    Fax: +49 89 5900-16000    E-Mail: pfann@br-online.de
"To the question of life after death: Not whether such a thing exists,
 but...What manner of life?"       "A Wayist Practicum" Reverend Bem, CY 10090
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