simcomp_executor.f90

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module simcomp_executor
  use num_types, only : rp
  use simulation_component, only : simulation_component_t, &
       simulation_component_wrapper_t, simulation_component_factory
  use json_module, only : json_file, json_core, json_value
  use json_utils, only : json_get, json_get_or_default, json_extract_item
  use case, only : case_t
  use utils, only : neko_error
  use logger, only : neko_log
  implicit none
  private
 
  type, public :: simcomp_executor_t
 
     class(simulation_component_wrapper_t), allocatable :: simcomps(:)
     integer, private :: n_simcomps
     type(case_t), pointer, private :: case
     logical, private :: finalized = .false.
   contains
     procedure, pass(this) :: init => simcomp_executor_init
     procedure, pass(this) :: free => simcomp_executor_free
     procedure, pass(this) :: add_user_simcomp => simcomp_executor_add
     procedure, pass(this) :: preprocess => simcomp_executor_preprocess
     procedure, pass(this) :: compute => simcomp_executor_compute
     procedure, pass(this) :: restart=> simcomp_executor_restart
     procedure, private, pass(this) :: finalize => simcomp_executor_finalize
     procedure, pass(this) :: get_n => simcomp_executor_get_n
  end type simcomp_executor_t
 
  type(simcomp_executor_t), target, public :: neko_simcomps
 
contains
 
  subroutine simcomp_executor_init(this, case, simcomp_root)
    class(simcomp_executor_t), intent(inout) :: this
    type(case_t), target, intent(inout) :: case
    character(len=*), optional, intent(in) :: simcomp_root
    integer :: n_simcomps, i
    type(json_core) :: core
    type(json_value), pointer :: simcomp_object
    type(json_file) :: comp_subdict
    logical :: found, is_user, has_user
    ! Help array for finding minimal values
    logical, allocatable :: mask(:)
    ! The order value for each simcomp in order of appearance in the case file.
    integer, allocatable :: read_order(:), order(:)
    ! Location of the min value
    integer :: loc(1)
    integer :: max_order
    character(len=:), allocatable :: root_name, comp_type
 
    call this%free()
    this%case => case
 
    ! Get the root name of the simulation components if specified
    if (present(simcomp_root)) then
       root_name = simcomp_root
    else
       root_name = 'case.simulation_components'
    end if
 
    ! Get the core json object and the simulation components object
    call case%params%get_core(core)
    call case%params%get(root_name, simcomp_object, found)
    if (.not. found) return
    call neko_log%section('Initialize simcomp')
 
    ! Set the number of simcomps and allocate the arrays
    call case%params%info(root_name, n_children = n_simcomps)
    this%n_simcomps = n_simcomps
    allocate(this%simcomps(n_simcomps))
    allocate(order(n_simcomps))
    allocate(read_order(n_simcomps))
    allocate(mask(n_simcomps), source = .true.)
 
    ! We need a separate loop to figure out the order, so that we can
    ! apply the order to the initialization as well.
    max_order = 0
    has_user = .false.
    do i = 1, n_simcomps
       ! Create a new json containing just the subdict for this simcomp
       call json_extract_item(core, simcomp_object, i, comp_subdict)
 
       call json_get_or_default(comp_subdict, "is_user", is_user, .false.)
       has_user = has_user .or. is_user
 
       call json_get_or_default(comp_subdict, "order", read_order(i), -1)
       if (read_order(i) .gt. max_order) then
          max_order = read_order(i)
       end if
    end do
 
    ! If the order was not specified, we use the order of appearance in the
    ! case file.
    do i = 1, n_simcomps
       if (read_order(i) == -1) then
          max_order = max_order + 1
          read_order(i) = max_order
       end if
    end do
 
    ! Figure out the execution order using a poor man's argsort.
    ! Searches for the location of the min value, each time masking out the
    ! found location prior to the next search.
    do i = 1, n_simcomps
       loc = minloc(read_order, mask = mask)
       order(i) = loc(1)
       mask(loc) = .false.
    end do
 
    ! Init in the determined order.
    do i = 1, n_simcomps
       call json_extract_item(core, simcomp_object, order(i), comp_subdict)
 
       ! Log the component type if it is not a user component
       call json_get(comp_subdict, "type", comp_type)
       call json_get_or_default(comp_subdict, "is_user", is_user, .false.)
       if (.not. is_user) call neko_log%message('- ' // trim(comp_type))
 
       call simulation_component_factory(this%simcomps(i)%simcomp, &
            comp_subdict, case)
    end do
 
    if (has_user) then
       call neko_log%message('Initialize user simcomp')
 
       comp_subdict = json_file(simcomp_object)
       call case%usr%init_user_simcomp(comp_subdict)
    end if
 
    ! Cleanup
    deallocate(order)
    deallocate(read_order)
    deallocate(mask)
 
    call neko_log%end_section()
  end subroutine simcomp_executor_init
 
  subroutine simcomp_executor_free(this)
    class(simcomp_executor_t), intent(inout) :: this
    integer :: i
 
    if (allocated(this%simcomps)) then
       do i = 1, this%n_simcomps
          call this%simcomps(i)%simcomp%free
       end do
       deallocate(this%simcomps)
    end if
  end subroutine simcomp_executor_free
 
  subroutine simcomp_executor_add(this, object, settings)
    class(simcomp_executor_t), intent(inout) :: this
    class(simulation_component_t), intent(in) :: object
    type(json_file), intent(inout), optional :: settings
 
    class(simulation_component_wrapper_t), allocatable :: tmp_simcomps(:)
    integer :: i, position
 
    ! Find the first empty position
    position = 0
    do i = 1, this%n_simcomps
       if (.not. allocated(this%simcomps(i)%simcomp)) then
          position = i
          exit
       end if
    end do
 
    ! If no empty position was found, append to the end
    if (position .eq. 0) then
       if (this%n_simcomps .gt. 0) call move_alloc(this%simcomps, tmp_simcomps)
       allocate(this%simcomps(this%n_simcomps + 1))
 
       if (allocated(tmp_simcomps)) then
          do i = 1, this%n_simcomps
             call move_alloc(tmp_simcomps(i)%simcomp, this%simcomps(i)%simcomp)
          end do
       end if
 
       this%n_simcomps = this%n_simcomps + 1
       position = this%n_simcomps
 
       if (allocated(tmp_simcomps)) deallocate(tmp_simcomps)
    end if
 
    this%simcomps(position)%simcomp = object
    if (present(settings)) then
       call this%simcomps(position)%simcomp%init(settings, this%case)
    end if
 
    this%finalized = .false.
 
  end subroutine simcomp_executor_add
 
  subroutine simcomp_executor_finalize(this)
    class(simcomp_executor_t), intent(inout) :: this
    integer :: i, order, max_order
    logical :: order_found, previous_found
 
    class(simulation_component_wrapper_t), allocatable :: tmp_simcomps(:)
    integer, allocatable :: order_list(:)
 
    ! Check that all components are initialized
    do i = 1, this%n_simcomps
       if (.not. allocated(this%simcomps(i)%simcomp)) then
          call neko_error("Simulation component not initialized.")
       end if
    end do
 
    ! Check that the order is unique and contiguous
    previous_found = .true.
    do order = 1, this%n_simcomps
       order_found = .false.
       do i = 1, this%n_simcomps
          if (this%simcomps(i)%simcomp%order == order .and. order_found) then
             call neko_error("Simulation component order must be unique.")
          else if (this%simcomps(i)%simcomp%order == order) then
             order_found = .true.
          end if
       end do
       if (order_found .and. .not. previous_found) then
          call neko_error("Simulation component order must be contiguous &
               &starting at 1.")
       end if
       previous_found = order_found
    end do
 
    allocate(order_list(this%n_simcomps))
    order_list = 0
    max_order = 0
    do i = 1, this%n_simcomps
       order_list(i) = this%simcomps(i)%simcomp%order
       if (order_list(i) .gt. max_order) then
          max_order = order_list(i)
       end if
    end do
 
    do i = 1, this%n_simcomps
       if (order_list(i) .eq. -1) then
          order_list(i) = max_order + 1
          max_order = max_order + 1
       end if
    end do
 
    ! Check that the order is within bounds
    do i = 1, this%n_simcomps
       if (order_list(i) .gt. this%n_simcomps) then
          deallocate(order_list)
          call neko_error("Simulation component order is out of bounds.")
       end if
    end do
 
    ! Reorder the simcomps based on the order specified
    call move_alloc(this%simcomps, tmp_simcomps)
    allocate(this%simcomps(this%n_simcomps))
    do i = 1, this%n_simcomps
       order = order_list(i)
       call move_alloc(tmp_simcomps(i)%simcomp, this%simcomps(order)%simcomp)
    end do
 
    if (allocated(tmp_simcomps)) then
       deallocate(tmp_simcomps)
    end if
    if (allocated(order_list)) then
       deallocate(order_list)
    end if
 
    this%finalized = .true.
  end subroutine simcomp_executor_finalize
 
  subroutine simcomp_executor_preprocess(this, t, tstep)
    class(simcomp_executor_t), intent(inout) :: this
    real(kind=rp), intent(in) :: t
    integer, intent(in) :: tstep
    integer :: i
 
    if (.not. this%finalized) call this%finalize()
 
    if (allocated(this%simcomps)) then
       do i = 1, size(this%simcomps)
          call this%simcomps(i)%simcomp%preprocess(t, tstep)
       end do
    end if
 
  end subroutine simcomp_executor_preprocess
 
  subroutine simcomp_executor_compute(this, t, tstep)
    class(simcomp_executor_t), intent(inout) :: this
    real(kind=rp), intent(in) :: t
    integer, intent(in) :: tstep
    integer :: i
 
    if (.not. this%finalized) call this%finalize()
 
    if (allocated(this%simcomps)) then
       do i = 1, this%n_simcomps
          call this%simcomps(i)%simcomp%compute(t, tstep)
       end do
    end if
 
  end subroutine simcomp_executor_compute
 
  subroutine simcomp_executor_restart(this, t)
    class(simcomp_executor_t), intent(inout) :: this
    real(kind=rp), intent(in) :: t
    integer :: i
 
    if (allocated(this%simcomps)) then
       do i = 1, this%n_simcomps
          call this%simcomps(i)%simcomp%restart(t)
       end do
    end if
 
  end subroutine simcomp_executor_restart
 
  pure function simcomp_executor_get_n(this) result(n)
    class(simcomp_executor_t), intent(in) :: this
    integer :: n
 
    n = this%n_simcomps
  end function simcomp_executor_get_n
 
end module simcomp_executor