getrequirement
getrequirement |
Purpose
Gets the cpvar representing the requirement of a task for a particular resource.
A task requires some amount of processing power of a resource when this amount must be made available for the execution of the task. The resource requirement is considered as recoverable which means that whenever the task ends the processing power that was used by it becomes available again for processing other tasks.
A task requires some amount of processing power of a resource when this amount must be made available for the execution of the task. The resource requirement is considered as recoverable which means that whenever the task ends the processing power that was used by it becomes available again for processing other tasks.
Synopsis
function getrequirement(task:cptask, resource:cpresource) : cpvar
function getrequirement(task:cptask, resource:cpresource, p:integer) : integer
Arguments
|
task
|
the task
|
|
resource
|
the resource
|
|
p
|
the timestep
|
Return value
The cpvar representing the requirement of 'resource' by 'task'
Example
The following example illustrates this:
model "Producer Consumer"
uses "kalis"
declarations
Masonry, Carpentry, Roofing, Windows, Facade, Garden, Plumbing,
Ceiling, Painting, MovingIn : cptask ! Declaration of tasks
money_available : cpresource ! Resource declaration
end-declarations
! 'money_available' is a cumulative resource with max. amount of 29$
set_resource_attributes(money_available,KALIS_DISCRETE_RESOURCE,29)
! Limit resource availability to 20$ in the time interval [0,14]
setcapacity(money_available, 0, 14, 20)
! Setting the task durations and predecessor sets
set_task_attributes(Masonry , 7 )
set_task_attributes(Carpentry, 3, {Masonry} )
set_task_attributes(Roofing , 1, {Carpentry} )
set_task_attributes(Windows , 1, {Roofing} )
set_task_attributes(Facade , 2, {Roofing} )
set_task_attributes(Garden , 1, {Roofing} )
set_task_attributes(Plumbing , 8, {Masonry} )
set_task_attributes(Ceiling , 3, {Masonry} )
set_task_attributes(Painting , 2, {Ceiling} )
set_task_attributes(MovingIn , 1, {Windows,Facade,Garden,Painting})
! Setting the resource consumptions
consumes(Masonry , 7, money_available )
consumes(Carpentry, 3, money_available )
consumes(Roofing , 1, money_available )
consumes(Windows , 1, money_available )
consumes(Facade , 2, money_available )
consumes(Garden , 1, money_available )
consumes(Plumbing , 8, money_available )
consumes(Ceiling , 3, money_available )
consumes(Painting , 2, money_available )
consumes(MovingIn , 1, money_available )
! Find the optimal schedule (minimizing the makespan)
if cp_minimize(getmakespan) then
cp_show_sol
else
writeln("No solution found")
end-if
end-model
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