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Load solver

The load solver uses the following pseudo-code to pass the ask from the operation to the resource.
In case the load has alternates, an aggregate resource or a required skill, the algorithm will search the suitable combination.

If the load has no alternates
  Call function chooseResource
else
  // Load has alternates
  Build a list of alternates, ordered by priority
  Switch to constrained planning mode
  Loop through all alternates
    Switch to the alternate
    Call function chooseResource
    If reply is positive and search mode is priority
      Return positive reply and exit
  if search mode is not priority and reply is positive
    Switch back to the best alternate found in the above loop
  if reply is 0
    if planning mode is unconstrained
      Switch to the first alternate
      Change the planning mode to unconstrained again
      Return full quantity and exit
    else
      Log the resource of the first alternate as the constraint on the order
      Return 0 and exit
  else
    Return positive reply and exit

function chooseResource:
  // Normal load
  If no skills are involved and the resource is not an aggregate resource
    Call the resource solver
    Return the result of the resource solver.
  else
    Find all member-resources that have the required skill
    Loop over all matching resources in order of priority
      Switch the operationplan to the resource
      Call the resource solver
      If the resource reply is positive and the search mode is PRIORITY
        Return the result of the resource solver
    If search mode wasn’t priority
      Switch back to the best alternate with a positive reply from the above loop
      Return the result of the resource solver
    If no positive reply was received at all
      If the plan type is unconstrained
        Switch the plan to the primary resource
        Return positive reply
      else
        Log this resource as a constraint for meeting the demand on time
        Return 0 and earliest next date

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