!WRF:DRIVER_LAYER:MAIN
!

!<DESCRIPTION>
! ESMF-specific modules for building WRF as an ESMF component.  
!
! This source file is only built when ESMF coupling is used.  
!
!</DESCRIPTION>



MODULE module_metadatautils
!<DESCRIPTION>
! This module defines component-independent "model metadata" utilities 
! used for ESMF coupling.  
!</DESCRIPTION>
!TODO:  Upgrade this later to support multiple coupling intervals via Alarms 
!TODO:  associated with top-level clock.  Do this by adding TimesAttachedToState() 
!TODO:  inquiry function that will test an ESMF_State to see if the times are 
!TODO:  present via names defined in this module.  Then call it for every 
!TODO:  component and resolve conflicts (somehow) for cases where two components 
!TODO:  define conflicting clocks.  Of course, a component is allowed to not attach 
!TODO:  times to a state at all, if it can handle any time step.  
!
!TODO:  Replace meta-data names with "model metadata" conventions such as CF 
!TODO:  (once they exist)
!
!TODO:  Refactor to remove duplication of hard-coded names.  
!
   USE ESMF

   IMPLICIT NONE

   ! everything is private by default
   PRIVATE

   ! Public interfaces
   PUBLIC AttachTimesToState
   PUBLIC GetTimesFromStates
   PUBLIC AttachDecompToState
   PUBLIC GetDecompFromState

   ! private stuff
   CHARACTER (ESMF_MAXSTR) :: str


CONTAINS


   ! Attach time information to state as meta-data.  
   ! Update later to use some form of meta-data standards/conventions for 
   ! model "time" meta-data.  
   SUBROUTINE AttachTimesToState( state, startTime, stopTime, couplingInterval )
     TYPE(ESMF_State),        INTENT(INOUT) :: state
     TYPE(ESMF_Time),         INTENT(INOUT) :: startTime
     TYPE(ESMF_Time),         INTENT(INOUT) :: stopTime
     TYPE(ESMF_TimeInterval), INTENT(INOUT) :: couplingInterval
     ! locals
     INTEGER :: rc
     INTEGER :: year, month, day, hour, minute, second
     INTEGER(ESMF_KIND_I4) :: timevals(6)   ! big enough to hold the vars listed above
     ! start time
     CALL ESMF_TimeGet(startTime, yy=year, mm=month, dd=day, &
                       h=hour, m=minute, s=second, rc=rc)
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal ( 'ESMF_TimeGet(startTime) failed' )
     ENDIF
     timevals(1) = year
     timevals(2) = month
     timevals(3) = day
     timevals(4) = hour
     timevals(5) = minute
     timevals(6) = second
     CALL ESMF_AttributeSet(state, 'ComponentStartTime', timevals, itemCount=SIZE(timevals), rc=rc)
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal ( 'ESMF_AttributeSet(ComponentStartTime) failed' )
     ENDIF
     ! stop time
     CALL ESMF_TimeGet(stopTime, yy=year, mm=month, dd=day, &
                       h=hour, m=minute, s=second, rc=rc)
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal ( 'ESMF_TimeGet(stopTime) failed' )
     ENDIF
     timevals(1) = year
     timevals(2) = month
     timevals(3) = day
     timevals(4) = hour
     timevals(5) = minute
     timevals(6) = second
     CALL ESMF_AttributeSet(state, 'ComponentStopTime', timevals, itemCount=SIZE(timevals), rc=rc)
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal ( 'ESMF_AttributeSet(ComponentStopTime) failed' )
     ENDIF
     ! coupling time step
     CALL ESMF_TimeIntervalGet(couplingInterval, yy=year, mm=month, d=day, &
                               h=hour, m=minute, s=second, rc=rc)
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal ( 'ESMF_TimeIntervalGet(couplingInterval) failed' )
     ENDIF
     timevals(1) = year
     timevals(2) = month
     timevals(3) = day
     timevals(4) = hour
     timevals(5) = minute
     timevals(6) = second
     CALL ESMF_AttributeSet(state, 'ComponentCouplingInterval', timevals, itemCount=SIZE(timevals), rc=rc)
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal ( 'ESMF_AttributeSet(ComponentCouplingInterval) failed' )
     ENDIF
   END SUBROUTINE AttachTimesToState



   ! Extract time information attached as meta-data from a single 
   ! ESMF_State.  
   ! Update later to use some form of meta-data standards/conventions for 
   ! model "time" meta-data.  
   SUBROUTINE GetTimesFromState( state, startTime, stopTime, couplingInterval, rc )
     TYPE(ESMF_State),        INTENT(INOUT) :: state
     TYPE(ESMF_Time),         INTENT(INOUT) :: startTime
     TYPE(ESMF_Time),         INTENT(INOUT) :: stopTime
     TYPE(ESMF_TimeInterval), INTENT(INOUT) :: couplingInterval
     INTEGER, INTENT(INOUT) :: rc
     ! locals
     INTEGER :: year, month, day, hour, minute, second
     INTEGER(ESMF_KIND_I4) :: timevals(6)   ! big enough to hold the vars listed above
     INTEGER :: thecount  ! 'one attribute ... ah ah ah. TWO attributes!  ah ah ah!!
     CHARACTER*256 mess
     ! start time
     thecount = SIZE(timevals)
     CALL ESMF_AttributeGet(state, 'ComponentStartTime', timevals, itemCount=thecount, rc=rc)
     IF ( rc /= ESMF_SUCCESS ) THEN
!JM return but don't fail; let the caller figure out what to do
       RETURN
     ENDIF
     year   = timevals(1)
     month  = timevals(2)
     day    = timevals(3)
     hour   = timevals(4)
     minute = timevals(5)
     second = timevals(6)
     CALL ESMF_TimeSet(startTime, yy=year, mm=month, dd=day, &
                       h=hour, m=minute, s=second, rc=rc)
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal ( 'ESMF_TimeSet(startTime) failed' )
     ENDIF
     ! stop time
     thecount = SIZE(timevals)
     CALL ESMF_AttributeGet(state, 'ComponentStopTime', timevals, itemCount=thecount, rc=rc)
     IF ( rc /= ESMF_SUCCESS ) THEN
!JM return but don't fail; let the caller figure out what to do
       !CALL wrf_error_fatal ( 'ESMF_AttributeGet(ComponentStopTime) failed' )
       RETURN
     ENDIF
     year   = timevals(1)
     month  = timevals(2)
     day    = timevals(3)
     hour   = timevals(4)
     minute = timevals(5)
     second = timevals(6)
     CALL ESMF_TimeSet(stopTime, yy=year, mm=month, dd=day, &
                       h=hour, m=minute, s=second, rc=rc)
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal ( 'ESMF_TimeSet(stopTime) failed' )
     ENDIF
     ! coupling time step
     thecount = SIZE(timevals)
     CALL ESMF_AttributeGet(state, 'ComponentCouplingInterval', timevals, itemCount=thecount, rc=rc)
     IF ( rc /= ESMF_SUCCESS ) THEN
!JM return but don't fail; let the caller figure out what to do
       !CALL wrf_error_fatal ( 'ESMF_AttributeGet(ComponentCouplingInterval) failed' )
       RETURN
     ENDIF
     year   = timevals(1)
     month  = timevals(2)
     day    = timevals(3)
     hour   = timevals(4)
     minute = timevals(5)
     second = timevals(6)
     CALL ESMF_TimeIntervalSet(couplingInterval, yy=year, mm=month, d=day, &
                               h=hour, m=minute, s=second, rc=rc)
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal ( 'ESMF_TimeIntervalSet(couplingInterval) failed' )
     ENDIF
   END SUBROUTINE GetTimesFromState



   ! Extract time information attached as meta-data from one or more 
   ! ESMF_States.  To use this with more than one ESMF_State, put the 
   ! ESMF_States into a single ESMF_State.  If times differ, an attempt 
   ! is made to reconcile them.  
   SUBROUTINE GetTimesFromStates( state, startTime, stopTime, couplingInterval )
   USE ESMF
     TYPE(ESMF_State),        INTENT(INOUT) :: state
     TYPE(ESMF_Time),         INTENT(INOUT) :: startTime
     TYPE(ESMF_Time),         INTENT(INOUT) :: stopTime
     TYPE(ESMF_TimeInterval), INTENT(INOUT) :: couplingInterval
     ! locals
     INTEGER :: rc
     INTEGER :: numItems, numStates, i, istate
     TYPE(ESMF_StateItem_Flag), ALLOCATABLE :: itemTypes(:)
     TYPE(ESMF_State) :: tmpState
     CHARACTER (len=ESMF_MAXSTR), ALLOCATABLE :: itemNames(:)
     TYPE(ESMF_Time),         ALLOCATABLE :: startTimes(:)
     TYPE(ESMF_Time),         ALLOCATABLE :: stopTimes(:)
     TYPE(ESMF_TimeInterval), ALLOCATABLE :: couplingIntervals(:)
     CHARACTER (len=132) :: mess

! Unfortunately, implementing this is unnecessarily difficult due 
! to lack of Iterators for ESMF_State.  

     ! Since there are no convenient iterators for ESMF_State, 
     ! write a lot of code...  
     ! Figure out how many items are in the ESMF_State
     CALL ESMF_StateGet(state, itemCount=numItems, rc=rc)
     IF ( rc /= ESMF_SUCCESS) THEN
       CALL wrf_error_fatal ( 'ESMF_StateGet(numItems) failed' )
     ENDIF
     ! allocate an array to hold the types of all items
     ALLOCATE( itemTypes(numItems) )
     ! allocate an array to hold the names of all items
     ALLOCATE( itemNames(numItems) )
     ! get the item types and names
     CALL ESMF_StateGet(state, itemtypeList=itemTypes, &
                        itemNameList=itemNames, rc=rc)
     IF ( rc /= ESMF_SUCCESS) THEN
       WRITE(str,*) 'ESMF_StateGet itemTypes failed with rc = ', rc
       CALL wrf_error_fatal ( str )
     ENDIF
     ! count how many items are ESMF_States
     numStates = 0
     DO i=1,numItems
       IF ( itemTypes(i) == ESMF_STATEITEM_STATE ) THEN
         numStates = numStates + 1
       ENDIF
     ENDDO
     ALLOCATE( startTimes(numStates), stopTimes(numStates), &
               couplingIntervals(numStates) )
     IF ( numStates > 0) THEN
       ! finally, extract nested ESMF_States by name, if there are any
       ! (should be able to do this by index at least!)
       istate = 0
       DO i=1,numItems
         IF ( itemTypes(i) == ESMF_STATEITEM_STATE ) THEN
           CALL ESMF_StateGet( state, itemName=TRIM(itemNames(i)), &
                               nestedState=tmpState, rc=rc )
           IF ( rc /= ESMF_SUCCESS) THEN
             WRITE(str,*) 'ESMF_StateGet(',TRIM(itemNames(i)),') failed'
             CALL wrf_error_fatal ( str )
           ENDIF
           istate = istate + 1
           CALL GetTimesFromState( tmpState, startTimes(istate),         &
                                             stopTimes(istate),          &
                                             couplingIntervals(istate), rc )
           IF ( rc /= ESMF_SUCCESS ) THEN
             istate = istate - 1
           ENDIF
         ENDIF
       ENDDO
       IF ( istate .EQ. 1 ) THEN
        ! this presupposes that 1 of the child states exist and has
        ! valid times in it.  Use that one.
          WRITE(mess,*)'WARNING: Only ',TRIM(itemNames(1)),&
                       ' is valid and has time info in it.  Using that.'
          CALL wrf_message(mess) 
          CALL ESMF_StateGet( state, itemName=TRIM(itemNames(1)), &
                              nestedState=tmpState, rc=rc )
          CALL GetTimesFromState( tmpState, startTime, stopTime, &
                                  couplingInterval , rc )
       ELSE IF ( istate .GT. 1 ) THEN
          CALL ReconcileTimes( startTimes, stopTimes, couplingIntervals, &
                               startTime,  stopTime,  couplingInterval )
       ELSE 
          CALL wrf_error_fatal('no valid states with times found. giving up.')
       ENDIF
     ELSE
       ! there are no nested ESMF_States so use parent state only
       CALL GetTimesFromState( state, startTime, stopTime, &
                               couplingInterval , rc )
     ENDIF

     ! deallocate locals
     DEALLOCATE( itemTypes )
     DEALLOCATE( itemNames )
     DEALLOCATE( startTimes, stopTimes, couplingIntervals )

   END SUBROUTINE GetTimesFromStates


   ! Reconcile all times and intervals in startTimes, stopTimes, and 
   ! couplingIntervals and return the results in startTime, stopTime, and 
   ! couplingInterval.  Abort if reconciliation is not possible.  
   SUBROUTINE ReconcileTimes( startTimes, stopTimes, couplingIntervals, &
                              startTime,  stopTime,  couplingInterval )
     TYPE(ESMF_Time),         INTENT(INOUT) :: startTimes(:)
     TYPE(ESMF_Time),         INTENT(INOUT) :: stopTimes(:)
     TYPE(ESMF_TimeInterval), INTENT(INOUT) :: couplingIntervals(:)
     TYPE(ESMF_Time),         INTENT(INOUT) :: startTime
     TYPE(ESMF_Time),         INTENT(INOUT) :: stopTime
     TYPE(ESMF_TimeInterval), INTENT(INOUT) :: couplingInterval
     ! locals
     INTEGER :: numTimes, numTimesTmp, i

     ! how many sets of time info?
     numTimes = SIZE(startTimes)
     IF ( numTimes < 2 ) THEN
       CALL wrf_error_fatal ( 'SIZE(startTimes) too small' )
     ENDIF
     numTimesTmp = SIZE(stopTimes)
     IF ( numTimes /= numTimesTmp ) THEN
       CALL wrf_error_fatal ( 'incorrect SIZE(stopTimes)' )
     ENDIF
     numTimesTmp = SIZE(couplingIntervals)
     IF ( numTimes /= numTimesTmp ) THEN
       CALL wrf_error_fatal ( 'incorrect SIZE(couplingIntervals)' )
     ENDIF

     ! reconcile
!TODO:  For now this is very simple.  Fancy it up later.  
     DO i = 1, numTimes
       IF ( i == 1 ) THEN
         startTime = startTimes(i)
         stopTime = stopTimes(i)
         couplingInterval = couplingIntervals(i)
       ELSE
!jm         IF ( startTimes(i) /= startTime ) THEN
!jm           CALL wrf_message ( 'ReconcileTimes:  inconsistent startTimes. Using first.' )
!jm           startTimes(i) = startTime
!jm         ENDIF
!jm         IF ( stopTimes(i) /= stopTime ) THEN
!jm           CALL wrf_message ( 'ReconcileTimes:  inconsistent stopTimes. Using first.' )
!jm           stopTimes(i) = stopTime
!jm         ENDIF
         IF ( startTimes(i) > startTime ) THEN
           CALL wrf_message ( 'ReconcileTimes:  inconsistent startTimes. Using later.' )
           startTime = startTimes(i)
         ENDIF
         IF ( stopTimes(i) < stopTime ) THEN
           CALL wrf_message ( 'ReconcileTimes:  inconsistent stopTimes. Using earlier.' )
           stopTime = stopTimes(i)
         ENDIF
         IF ( couplingIntervals(i) /= couplingInterval ) THEN
           CALL wrf_message ( 'ReconcileTimes:  inconsistent couplingIntervals. Using first.' )
           couplingIntervals(i) = couplingInterval
         ENDIF
       ENDIF
     ENDDO
     stopTimes = stopTime
     startTimes = startTime

   END SUBROUTINE ReconcileTimes



   !TODO:  Eliminate this once this information can be derived via other 
   !TODO:  means.  
   SUBROUTINE AttachDecompToState( state,                        & 
                                   ids, ide, jds, jde, kds, kde, &
                                   ims, ime, jms, jme, kms, kme, &
                                   ips, ipe, jps, jpe, kps, kpe, &
                                   domdesc, bdy_mask )
     TYPE(ESMF_State), INTENT(INOUT) :: state
     INTEGER,          INTENT(IN   ) :: ids, ide, jds, jde, kds, kde
     INTEGER,          INTENT(IN   ) :: ims, ime, jms, jme, kms, kme
     INTEGER,          INTENT(IN   ) :: ips, ipe, jps, jpe, kps, kpe
     INTEGER,          INTENT(IN   ) :: domdesc
     LOGICAL,          INTENT(IN   ) :: bdy_mask(4)
     ! locals
     INTEGER :: i, rc
     ! big enough to hold the integer values listed above
     INTEGER(ESMF_KIND_I4) :: intvals(19)
     ! big enough to hold the logical values listed above
!     TYPE(ESMF_Logical) :: logvals(4)
     logical :: logvals(4)

     ! first the logicals
     ! Usually, when writing an API for a target language, it is considered 
     ! good practice to use native types of the target language in the 
     ! interfaces.  
     logvals = .FALSE.
     DO i = 1, SIZE(bdy_mask)
       IF (bdy_mask(i)) THEN
         logvals(i) = .TRUE.
       ENDIF
     ENDDO
     CALL ESMF_AttributeSet(state, 'DecompositionLogicals', logvals, itemCount=SIZE(logvals), rc=rc)
     IF ( rc /= ESMF_SUCCESS) THEN
       CALL wrf_error_fatal ( 'ESMF_AttributeSet(DecompositionLogicals) failed' )
     ENDIF
     ! now the integers
     intvals(1) = ids
     intvals(2) = ide
     intvals(3) = jds
     intvals(4) = jde
     intvals(5) = kds
     intvals(6) = kde
     intvals(7) = ims
     intvals(8) = ime
     intvals(9) = jms
     intvals(10) = jme
     intvals(11) = kms
     intvals(12) = kme
     intvals(13) = ips
     intvals(14) = ipe
     intvals(15) = jps
     intvals(16) = jpe
     intvals(17) = kps
     intvals(18) = kpe
     intvals(19) = domdesc
     CALL ESMF_AttributeSet(state, 'DecompositionIntegers', intvals, itemCount=SIZE(intvals), rc=rc)
     IF ( rc /= ESMF_SUCCESS) THEN
       CALL wrf_error_fatal ( 'ESMF_AttributeSet(DecompositionIntegers) failed' )
     ENDIF
   END SUBROUTINE AttachDecompToState



   !TODO:  Eliminate this once this information can be derived via other 
   !TODO:  means.  
   SUBROUTINE GetDecompFromState( state,                        & 
                                  ids, ide, jds, jde, kds, kde, &
                                  ims, ime, jms, jme, kms, kme, &
                                  ips, ipe, jps, jpe, kps, kpe, &
                                  domdesc, bdy_mask )
     TYPE(ESMF_State), INTENT(INOUT) :: state
     INTEGER,          INTENT(  OUT) :: ids, ide, jds, jde, kds, kde
     INTEGER,          INTENT(  OUT) :: ims, ime, jms, jme, kms, kme
     INTEGER,          INTENT(  OUT) :: ips, ipe, jps, jpe, kps, kpe
     INTEGER,          INTENT(  OUT) :: domdesc
     LOGICAL,          INTENT(  OUT) :: bdy_mask(4)
     ! locals
     INTEGER :: i, rc
     ! big enough to hold the integer values listed above
     INTEGER(ESMF_KIND_I4) :: intvals(19)
     ! big enough to hold the logical values listed above
     logical :: logvals(4)
     integer :: thecount ! ah ah ah

     ! first the logicals
     thecount = SIZE(logvals)
     CALL ESMF_AttributeGet(state, 'DecompositionLogicals', logvals, itemCount=thecount, rc=rc)
     IF ( rc /= ESMF_SUCCESS) THEN
       CALL wrf_error_fatal ( 'ESMF_AttributeGet(DecompositionLogicals) failed' )
     ENDIF
     ! Usually, when writing an API for a target language, it is considered 
     ! good practice to use native types of the target language in the 
     ! interfaces.  
     bdy_mask = .FALSE.
     DO i = 1, SIZE(logvals)
       IF (logvals(i) ) THEN
         bdy_mask(i) = .TRUE.
       ENDIF
     ENDDO
     ! now the integers
     thecount = SIZE(intvals)
     CALL ESMF_AttributeGet(state, 'DecompositionIntegers', intvals, itemCount=thecount, rc=rc)
     IF ( rc /= ESMF_SUCCESS) THEN
       CALL wrf_error_fatal ( 'ESMF_AttributeGet(DecompositionIntegers) failed' )
     ENDIF
     ids = intvals(1)
     ide = intvals(2)
     jds = intvals(3)
     jde = intvals(4)
     kds = intvals(5)
     kde = intvals(6)
     ims = intvals(7)
     ime = intvals(8)
     jms = intvals(9)
     jme = intvals(10)
     kms = intvals(11)
     kme = intvals(12)
     ips = intvals(13)
     ipe = intvals(14)
     jps = intvals(15)
     jpe = intvals(16)
     kps = intvals(17)
     kpe = intvals(18)
     domdesc = intvals(19)
   END SUBROUTINE GetDecompFromState



END MODULE module_metadatautils



MODULE module_wrf_component_top
!<DESCRIPTION>
! This module defines wrf_component_init1(), wrf_component_init2(), 
! wrf_component_run(), and wrf_component_finalize() routines that are called 
! when WRF is run as an ESMF component.  
!</DESCRIPTION>

   USE ESMF
   USE module_wrf_top, ONLY : wrf_init, wrf_run, wrf_finalize
   USE module_domain, ONLY : head_grid, get_ijk_from_grid
   USE module_state_description
   USE module_streams

   USE module_esmf_extensions
   USE module_metadatautils, ONLY: AttachTimesToState, AttachDecompToState



   IMPLICIT NONE

   ! everything is private by default
   PRIVATE

   ! Public entry points
   PUBLIC wrf_component_init1
   PUBLIC wrf_component_init2
   PUBLIC wrf_component_run
   PUBLIC wrf_component_finalize

   ! private stuff
   CHARACTER (ESMF_MAXSTR) :: str

CONTAINS


   SUBROUTINE wrf_component_init1( gcomp, importState, exportState, clock, rc )
     TYPE(ESMF_GridComp), TARGET, INTENT(INOUT) :: gcomp
     TYPE(ESMF_State),    TARGET, INTENT(INOUT) :: importState
     TYPE(ESMF_State),    TARGET, INTENT(INOUT) :: exportState
     TYPE(ESMF_Clock),    TARGET, INTENT(INOUT) :: clock
#ifdef DM_PARALLEL
     TYPE(ESMF_VM) :: vm
     INTEGER :: mpicomtmp
#endif
     INTEGER,                     INTENT(  OUT) :: rc
!<DESCRIPTION>
!     WRF component init routine, phase 1.  Passes relevant coupling 
!     information back as metadata on exportState.  
!
!     The arguments are:
!       gcomp           Component
!       importState     Importstate
!       exportState     Exportstate
!       clock           External clock
!       rc              Return code; equals ESMF_SUCCESS if there are no errors,
!                       otherwise ESMF_FAILURE.
!</DESCRIPTION>
!TODO:  Note that much of the decomposition-related meta-data attached to the 
!TODO:  exportState are WRF-specific and are only useful if other components 
!TODO:  want to re-use the WRF IOAPI with the same decomposition as the WRF 
!TODO:  model.  This is true for the simple WRF+CPL+SST test case, but will 
!TODO:  not be in general.  Of course other components are free to ignore this 
!TODO:  information.  

     ! Local variables
     TYPE(ESMF_GridComp), POINTER :: p_gcomp
     TYPE(ESMF_State),    POINTER :: p_importState
     TYPE(ESMF_State),    POINTER :: p_exportState
     TYPE(ESMF_Clock),    POINTER :: p_clock
     ! Time hackery
     TYPE(ESMF_Time) :: startTime
     TYPE(ESMF_Time) :: stopTime
     TYPE(ESMF_TimeInterval) :: couplingInterval
     ! decomposition hackery
     INTEGER :: ids, ide, jds, jde, kds, kde
     INTEGER :: ims, ime, jms, jme, kms, kme
     INTEGER :: ips, ipe, jps, jpe, kps, kpe
     INTEGER :: domdesc
     LOGICAL :: bdy_mask(4)
     CHARACTER(LEN=256) :: couplingIntervalString

     rc = ESMF_SUCCESS

     p_gcomp => gcomp
     p_importState => importState
     p_exportState => exportState
     p_clock => clock
     ! NOTE:  It will be possible to remove this call once ESMF supports 
     !        interfaces ESMF_ClockGetCurrent(), ESMF_ImportStateGetCurrent(), 
     !        ESMF_ExportStateGetCurrent(), and ESMF_GridCompGetCurrent().  
     CALL ESMF_SetCurrent( gcomp=p_gcomp, importState=p_importState, &
                           exportState=p_exportState, clock=p_clock )

#ifdef DM_PARALLEL
     CALL ESMF_VMGetCurrent(vm, rc=rc)
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal ( 'wrf_component_init1:  ESMF_VMGetCurrent failed' )
     ENDIF
     CALL ESMF_VMGet(vm, mpiCommunicator=mpicomtmp, rc=rc)
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal ( 'wrf_component_init1:  ESMF_VMGet failed' )
     ENDIF
     CALL wrf_set_dm_communicator( mpicomtmp )
#endif

     ! Call WRF "init" routine, which, for a DM_PARALLEL run, will recognize 
     ! that ESMF has already called MPI_INIT and respond appropriately.  
     CALL wrf_init( no_init1=.TRUE. )

     ! For now, use settings from WRF component intialization to set up 
     ! top-level clock.  Per suggestion from ESMF Core team, these are passed 
     ! back as attributes on exportState.  
     CALL wrf_clockprint( 100, head_grid%domain_clock, &
            'DEBUG wrf_component_init1():  head_grid%domain_clock,' )
     CALL ESMF_ClockGet(head_grid%domain_clock, startTime=startTime, &
                        stopTime=stopTime, rc=rc)
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal ( 'wrf_component_init1:  ESMF_ClockGet failed' )
     ENDIF
     CALL wrf_debug( 500, 'DEBUG wrf_component_init1():  before wrf_findCouplingInterval' )
     CALL wrf_findCouplingInterval( startTime, stopTime, couplingInterval )
     CALL wrf_debug( 500, 'DEBUG wrf_component_init1():  after wrf_findCouplingInterval' )
     CALL ESMF_TimeIntervalGet( couplingInterval, TimeString=couplingIntervalString, &
                                rc=rc )
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal ( 'wrf_component_init1:  ESMF_TimeIntervalGet failed' )
     ENDIF
     CALL wrf_debug( 100, 'DEBUG wrf_component_init1():  couplingInterval = '//TRIM(couplingIntervalString) )
     CALL AttachTimesToState( exportState, startTime, stopTime, couplingInterval )
     CALL wrf_getDecompInfo( ids, ide, jds, jde, kds, kde, &
                             ims, ime, jms, jme, kms, kme, &
                             ips, ipe, jps, jpe, kps, kpe, &
                             domdesc, bdy_mask )
     CALL AttachDecompToState( exportState,                  &
                               ids, ide, jds, jde, kds, kde, &
                               ims, ime, jms, jme, kms, kme, &
                               ips, ipe, jps, jpe, kps, kpe, &
                               domdesc, bdy_mask )
     CALL AttachDecompToState( importState,                  &
                               ids, ide, jds, jde, kds, kde, &
                               ims, ime, jms, jme, kms, kme, &
                               ips, ipe, jps, jpe, kps, kpe, &
                               domdesc, bdy_mask )

   END SUBROUTINE wrf_component_init1



   SUBROUTINE wrf_component_init2( gcomp, importState, exportState, clock, rc )
     TYPE(ESMF_GridComp), TARGET, INTENT(INOUT) :: gcomp
     TYPE(ESMF_State),    TARGET, INTENT(INOUT) :: importState
     TYPE(ESMF_State),    TARGET, INTENT(INOUT) :: exportState
     TYPE(ESMF_Clock),    TARGET, INTENT(INOUT) :: clock
     INTEGER,                     INTENT(  OUT) :: rc
!<DESCRIPTION>
!     WRF component init routine, phase 2.  Initializes importState and 
!     exportState.  
!
!     The arguments are:
!       gcomp           Component
!       importState     Importstate
!       exportState     Exportstate
!       clock           External clock
!       rc              Return code; equals ESMF_SUCCESS if there are no errors,
!                       otherwise ESMF_FAILURE.
!</DESCRIPTION>

     ! Local variables
     TYPE(ESMF_GridComp), POINTER :: p_gcomp
     TYPE(ESMF_State),    POINTER :: p_importState
     TYPE(ESMF_State),    POINTER :: p_exportState
     TYPE(ESMF_Clock),    POINTER :: p_clock
     ! Time hackery
     TYPE(ESMF_Time) :: startTime
     TYPE(ESMF_Time) :: stopTime
     TYPE(ESMF_TimeInterval) :: couplingInterval
     ! decomposition hackery
     INTEGER :: ids, ide, jds, jde, kds, kde
     INTEGER :: ims, ime, jms, jme, kms, kme
     INTEGER :: ips, ipe, jps, jpe, kps, kpe
     INTEGER :: domdesc
     LOGICAL :: bdy_mask(4)
     INTEGER :: itemCount, i
     TYPE(ESMF_StateIntent_Flag) :: stateintent
     CHARACTER (ESMF_MAXSTR) :: statename
     CHARACTER (ESMF_MAXSTR), ALLOCATABLE :: itemNames(:)
     TYPE(ESMF_StateItem_Flag), ALLOCATABLE :: itemTypes(:)

     CALL wrf_debug ( 100, 'wrf_component_init2():  begin' )

     ! check exportState
     CALL ESMF_StateGet( exportState, itemCount=itemCount, &
                         stateintent=stateintent, rc=rc )
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal("wrf_component_init2:  ESMF_StateGet(exportState) failed" )
     ENDIF
     WRITE (str,*) 'wrf_component_init2: exportState itemCount = ', itemCount
     CALL wrf_debug ( 100 , TRIM(str) )
     IF ( stateintent /= ESMF_STATEINTENT_EXPORT ) THEN
       CALL wrf_error_fatal("wrf_component_init2:  exportState is not an export state" )
     ENDIF

     ! check importState
     CALL ESMF_StateGet( importState, itemCount=itemCount, &
                         stateintent=stateintent, rc=rc )
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal("wrf_component_init2:  ESMF_StateGet(importState) failed" )
     ENDIF
     WRITE (str,*) 'wrf_component_init2: importState itemCount = ', itemCount
     CALL wrf_debug ( 100 , TRIM(str) )
     IF ( stateintent /= ESMF_STATEINTENT_IMPORT ) THEN
       CALL wrf_error_fatal("wrf_component_init2:  importState is not an import state" )
     ENDIF

     p_gcomp => gcomp
     p_importState => importState
     p_exportState => exportState
     p_clock => clock
     ! NOTE:  It will be possible to remove this call once ESMF supports 
     !        interfaces ESMF_ClockGetCurrent(), ESMF_ImportStateGetCurrent(), 
     !        ESMF_ExportStateGetCurrent(), and ESMF_GridCompGetCurrent().  
     CALL ESMF_SetCurrent( gcomp=p_gcomp, importState=p_importState, &
                           exportState=p_exportState, clock=p_clock )

     ! populate ESMF import and export states
     CALL wrf_state_populate( rc )
     IF ( rc /= 0 ) THEN
       CALL wrf_error_fatal ( 'wrf_component_init2:  wrf_state_populate failed' )
     ENDIF

     ! examine importState
     WRITE (str,*) 'wrf_component_init2: EXAMINING importState...'
     CALL wrf_debug ( 100 , TRIM(str) )
     CALL ESMF_StateGet( importState, itemCount=itemCount, &
                         stateintent=stateintent, name=statename, rc=rc )
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal("wrf_component_init2:  ESMF_StateGet(importState) failed B" )
     ENDIF
     IF ( stateintent /= ESMF_STATEINTENT_IMPORT ) THEN
       CALL wrf_error_fatal("wrf_component_init2:  importState is not an import state" )
     ENDIF
     WRITE (str,*) 'wrf_component_init2: importState <',TRIM(statename), &
                   '> itemCount = ', itemCount
     CALL wrf_debug ( 100 , TRIM(str) )
     ALLOCATE ( itemNames(itemCount), itemTypes(itemCount) )
     CALL ESMF_StateGet( importState, itemNameList=itemNames, &
                         itemtypeList=itemTypes, rc=rc )
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal("wrf_component_init2:  ESMF_StateGet(importState) failed C" )
     ENDIF
     DO i=1, itemCount
       IF ( itemTypes(i) == ESMF_STATEITEM_FIELD ) THEN
         WRITE(str,*) 'wrf_component_init2: importState contains field <',TRIM(itemNames(i)),'>'
         CALL wrf_debug ( 100 , TRIM(str) )
       ENDIF
     ENDDO
     DEALLOCATE ( itemNames, itemTypes )
     WRITE (str,*) 'wrf_component_init2: DONE EXAMINING importState...'
     CALL wrf_debug ( 100 , TRIM(str) )

     ! examine exportState
     WRITE (str,*) 'wrf_component_init2: EXAMINING exportState...'
     CALL wrf_debug ( 100 , TRIM(str) )
     CALL ESMF_StateGet( exportState, itemCount=itemCount, &
                         stateintent=stateintent, name=statename, rc=rc )
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal("wrf_component_init2:  ESMF_StateGet(exportState) failed B" )
     ENDIF
     IF ( stateintent /= ESMF_STATEINTENT_EXPORT ) THEN
       CALL wrf_error_fatal("wrf_component_init2:  exportState is not an export state" )
     ENDIF
     WRITE (str,*) 'wrf_component_init2: exportState <',TRIM(statename), &
                   '> itemCount = ', itemCount
     CALL wrf_debug ( 100 , TRIM(str) )
     ALLOCATE ( itemNames(itemCount), itemTypes(itemCount) )
     CALL ESMF_StateGet( exportState, itemNameList=itemNames, &
                         itemtypeList=itemTypes, rc=rc )
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal("wrf_component_init2:  ESMF_StateGet(exportState) failed C" )
     ENDIF
     DO i=1, itemCount
       IF ( itemTypes(i) == ESMF_STATEITEM_FIELD ) THEN
         WRITE(str,*) 'wrf_component_init2: exportState contains field <',TRIM(itemNames(i)),'>'
         CALL wrf_debug ( 100 , TRIM(str) )
       ENDIF
     ENDDO
     DEALLOCATE ( itemNames, itemTypes )
     WRITE (str,*) 'wrf_component_init2: DONE EXAMINING exportState...'
     CALL wrf_debug ( 100 , TRIM(str) )

     CALL wrf_debug ( 100, 'DEBUG wrf_component_init2():  end' )

   END SUBROUTINE wrf_component_init2



   SUBROUTINE wrf_component_run( gcomp, importState, exportState, clock, rc )
     TYPE(ESMF_GridComp), TARGET, INTENT(INOUT) :: gcomp
     TYPE(ESMF_State),    TARGET, INTENT(INOUT) :: importState, exportState
     TYPE(ESMF_Clock),    TARGET, INTENT(INOUT) :: clock
     INTEGER,                     INTENT(  OUT) :: rc
!<DESCRIPTION>
!     WRF component run routine.
!
!     The arguments are:
!       gcomp           Component
!       importState     Importstate
!       exportState     Exportstate
!       clock           External clock
!       rc              Return code; equals ESMF_SUCCESS if there are no errors,
!                       otherwise ESMF_FAILURE.
!</DESCRIPTION>

     ! Local variables
     TYPE(ESMF_GridComp), POINTER :: p_gcomp
     TYPE(ESMF_State),    POINTER :: p_importState
     TYPE(ESMF_State),    POINTER :: p_exportState
     TYPE(ESMF_Clock),    POINTER :: p_clock
     ! timing
     TYPE(ESMF_Time) :: currentTime, nextTime
     TYPE(ESMF_TimeInterval) :: runLength     ! how long to run in this call
     CHARACTER(LEN=256) :: timeStr

     CALL wrf_debug ( 100 , 'DEBUG wrf_component_run():  begin' )

     p_gcomp => gcomp
     p_importState => importState
     p_exportState => exportState
     p_clock => clock
     ! NOTE:  It will be possible to remove this call once ESMF supports 
     !        interfaces ESMF_ClockGetCurrent(), ESMF_ImportStateGetCurrent(), 
     !        ESMF_ExportStateGetCurrent(), and ESMF_GridCompGetCurrent().  
     CALL ESMF_SetCurrent( gcomp=p_gcomp, importState=p_importState, &
                           exportState=p_exportState, clock=p_clock )

     ! connect ESMF clock with WRF domain clock
     CALL ESMF_ClockGet( clock, currTime=currentTime, timeStep=runLength, rc=rc )
     IF ( rc /= ESMF_SUCCESS ) THEN
       CALL wrf_error_fatal ( 'wrf_component_run:  ESMF_ClockGet failed' )
     ENDIF
     CALL wrf_clockprint(100, clock, &
            'DEBUG wrf_component_run():  clock,')
     nextTime = currentTime + runLength
     head_grid%start_subtime = currentTime
     head_grid%stop_subtime = nextTime
     CALL wrf_timetoa ( head_grid%start_subtime, timeStr )
     WRITE (str,*) 'wrf_component_run:  head_grid%start_subtime ',TRIM(timeStr)
     CALL wrf_debug ( 100 , TRIM(str) )
     CALL wrf_timetoa ( head_grid%stop_subtime, timeStr )
     WRITE (str,*) 'wrf_component_run:  head_grid%stop_subtime ',TRIM(timeStr)
     CALL wrf_debug ( 100 , TRIM(str) )

     ! Call WRF "run" routine
     CALL wrf_debug ( 100 , 'DEBUG wrf_component_run():  calling wrf_run()' )
     CALL wrf_run( )
     CALL wrf_debug ( 100 , 'DEBUG wrf_component_run():  back from wrf_run()' )

     CALL wrf_debug ( 100 , 'DEBUG wrf_component_run():  end' )

   END SUBROUTINE wrf_component_run



   SUBROUTINE wrf_component_finalize( gcomp, importState, exportState, clock, rc )
     TYPE(ESMF_GridComp), TARGET, INTENT(INOUT) :: gcomp
     TYPE(ESMF_State),    TARGET, INTENT(INOUT) :: importState, exportState
     TYPE(ESMF_Clock),    TARGET, INTENT(INOUT) :: clock
     INTEGER,                     INTENT(  OUT) :: rc
!<DESCRIPTION>
!     WRF component finalize routine.
!
!     The arguments are:
!       gcomp           Component
!       importState     Importstate
!       exportState     Exportstate
!       clock           External clock
!       rc              Return code; equals ESMF_SUCCESS if there are no errors,
!                       otherwise ESMF_FAILURE.
!</DESCRIPTION>

     ! Local variables
     TYPE(ESMF_GridComp), POINTER :: p_gcomp
     TYPE(ESMF_State),    POINTER :: p_importState
     TYPE(ESMF_State),    POINTER :: p_exportState
     TYPE(ESMF_Clock),    POINTER :: p_clock
     INTEGER :: rc
     p_gcomp => gcomp
     p_importState => importState
     p_exportState => exportState
     p_clock => clock
     ! NOTE:  It will be possible to remove this call once ESMF supports 
     !        interfaces ESMF_ClockGetCurrent(), ESMF_ImportStateGetCurrent(), 
     !        ESMF_ExportStateGetCurrent(), and ESMF_GridCompGetCurrent().  
     CALL ESMF_SetCurrent( gcomp=p_gcomp, importState=p_importState, &
                           exportState=p_exportState, clock=p_clock )

     ! Call WRF "finalize" routine, suppressing call to MPI_FINALIZE so 
     ! ESMF can do it (if needed) during ESMF_Finalize().  
     CALL wrf_finalize( no_shutdown=.TRUE. )

     rc = ESMF_SUCCESS

   END SUBROUTINE wrf_component_finalize



   SUBROUTINE wrf_findCouplingInterval( startTime, stopTime, couplingInterval )
     TYPE(ESMF_Time),         INTENT(IN   ) :: startTime
     TYPE(ESMF_Time),         INTENT(IN   ) :: stopTime
     TYPE(ESMF_TimeInterval), INTENT(  OUT) :: couplingInterval
!<DESCRIPTION>
!     WRF convenience routine for deducing coupling interval.  The startTime 
!     and stopTime arguments are only used for determining a default value 
!     when coupling is not actually being done.  
!
!     The arguments are:
!       startTime          start time
!       stopTime           stop time
!       couplingInterval   coupling interval
!</DESCRIPTION>
     ! locals
     LOGICAL :: foundcoupling
     INTEGER :: rc
     INTEGER :: io_form
     ! external function prototype
     INTEGER, EXTERNAL :: use_package

     ! deduce coupling time-step
     foundcoupling = .FALSE.
!TODO:  This bit just finds the FIRST case and extracts coupling interval...  
!TODO:  Add error-checking for over-specification.  
!TODO:  Add support for multiple coupling intervals later...  
!TODO:  Add support for coupling that does not begin immediately later...  
!TODO:  Get rid of duplication once I/O refactoring is finished (and 
!TODO:  auxio streams can be addressed via index).  

#include "med_find_esmf_coupling.inc"

     ! look for erroneous use of io_form...  
     CALL nl_get_io_form_restart( 1, io_form )
     IF ( use_package( io_form ) == IO_ESMF ) THEN
       CALL wrf_error_fatal ( 'wrf_findCouplingInterval:  ERROR:  ESMF cannot be used for WRF restart I/O' )
     ENDIF
     CALL nl_get_io_form_input( 1, io_form )
     IF ( use_package( io_form ) == IO_ESMF ) THEN
       CALL wrf_error_fatal ( 'wrf_findCouplingInterval:  ERROR:  ESMF cannot be used for WRF input' )
     ENDIF
     CALL nl_get_io_form_history( 1, io_form )
     IF ( use_package( io_form ) == IO_ESMF ) THEN
       CALL wrf_error_fatal ( 'wrf_findCouplingInterval:  ERROR:  ESMF cannot be used for WRF history output' )
     ENDIF
     CALL nl_get_io_form_boundary( 1, io_form )
     IF ( use_package( io_form ) == IO_ESMF ) THEN
       CALL wrf_error_fatal ( 'wrf_findCouplingInterval:  ERROR:  ESMF cannot be used for WRF boundary I/O' )
     ENDIF

     ! If nobody uses IO_ESMF, then default is to run WRF all the way to 
     ! the end.  
     IF ( .NOT. foundcoupling ) THEN
       couplingInterval = stopTime - startTime
       call wrf_debug ( 1, 'WARNING:  ESMF coupling not used in this WRF run' )
     ENDIF

   END SUBROUTINE wrf_findCouplingInterval



   SUBROUTINE wrf_getDecompInfo( ids, ide, jds, jde, kds, kde, &
                                 ims, ime, jms, jme, kms, kme, &
                                 ips, ipe, jps, jpe, kps, kpe, &
                                 domdesc, bdy_mask )
     INTEGER, INTENT(OUT) :: ids, ide, jds, jde, kds, kde
     INTEGER, INTENT(OUT) :: ims, ime, jms, jme, kms, kme
     INTEGER, INTENT(OUT) :: ips, ipe, jps, jpe, kps, kpe
     INTEGER, INTENT(OUT) :: domdesc
     LOGICAL, INTENT(OUT) :: bdy_mask(4)
!<DESCRIPTION>
!     WRF convenience routine for deducing decomposition information.  
!TODO:  Note that domdesc is meaningful only for SPMD alternating event loops.  
!TODO:  For concurrent operation (SPMD or MPMD), we will need to create a new 
!TODO:  "domdesc" suitable for the task layout of the SST component.  For 
!TODO:  MPMD alternating event loops, we will need to serialize domdesc and 
!TODO:  store it as metadata within the export state.  Similar arguments apply
!TODO:  to [ij][mp][se] and bdy_mask.
!
!     The arguments are:
!       ids, ide, jds, jde, kds, kde    Domain extent.  
!       ims, ime, jms, jme, kms, kme    Memory extent.  
!       ips, ipe, jps, jpe, kps, kpe    Patch extent.  
!       domdesc                         Domain descriptor for external 
!                                       distributed-memory communication 
!                                       package (opaque to WRF).  
!       bdy_mask                        Boundary mask flags indicating which 
!                                       domain boundaries are on this task.  
!</DESCRIPTION>
     ! extract decomposition information from head_grid
     CALL get_ijk_from_grid( head_grid ,                   &
                             ids, ide, jds, jde, kds, kde, &
                             ims, ime, jms, jme, kms, kme, &
                             ips, ipe, jps, jpe, kps, kpe  )
#if 0
! JM
! with version 3 of ESMF's staggering concepts, WRF's non-staggered grid is equivalent to 
! esmf's 'exclusive' region -- that is the set of points that are owned by the 'DE' (eyeroll)
! WRF, on the other hand, is returning the 'staggered' dimensions here.  So convert to the
! unstaggered dims before returning.
! Don't bother with vertical dimension for the time being, since we're only doing 2D coupling.
!
     ide = ide-1 ; ipe = MIN(ide,ipe)
     jde = jde-1 ; jpe = MIN(jde,jpe)
#else
! JM
! with version 4 I have no damned clue at this writing... just random shots for now
! see if this works.
     ipe = MIN(ide-1,ipe)
     jpe = MIN(jde-1,jpe)
#endif

     domdesc = head_grid%domdesc
     bdy_mask = head_grid%bdy_mask
   END SUBROUTINE wrf_getDecompInfo


   SUBROUTINE wrf_state_populate( ierr )
     ! Driver layer
     USE module_domain, ONLY : domain
     USE module_io_domain
     ! Model layer
     USE module_configure, ONLY : grid_config_rec_type, model_to_grid_config_rec
     USE module_bc_time_utilities

     IMPLICIT NONE

!<DESCRIPTION>
!     Populate WRF import and export states from Registry-generated code.  
!     For now, only head_grid can be coupled.  
!
!</DESCRIPTION>
!TODO:  Extend later to include child 
!TODO:  domains, possibly via nested ESMF_State's.  

     ! Arguments
     INTEGER, INTENT(OUT)       :: ierr
     ! Local
     TYPE(domain), POINTER      :: grid
     TYPE(grid_config_rec_type) :: config_flags
     INTEGER                    :: stream, idum1, idum2, io_form
     CHARACTER*80               :: fname, n2
     ! external function prototype
     INTEGER, EXTERNAL          :: use_package

     ! for now support coupling to head_grid only
     grid => head_grid
! TODO:  Use actual grid via current_grid%id via something like this...  
!  IF ( current_grid_set ) THEN
!    grid => current_grid
!  ELSE
!    ERROR
!  ENDIF

     CALL model_to_grid_config_rec ( grid%id , model_config_rec , config_flags )
     CALL set_scalar_indices_from_config ( grid%id , idum1 , idum2 )

     stream = 0 
     ierr = 0

#include "med_open_esmf_calls.inc"

   END SUBROUTINE wrf_state_populate

END MODULE module_wrf_component_top



MODULE module_wrf_setservices
!<DESCRIPTION>
! This module defines WRF "Set Services" method wrf_register() 
! used for ESMF coupling.  
!</DESCRIPTION>

   USE module_wrf_component_top, ONLY: wrf_component_init1, &
                                       wrf_component_init2, &
                                       wrf_component_run,   &
                                       wrf_component_finalize
   USE ESMF

   IMPLICIT NONE

   ! everything is private by default
   PRIVATE

   ! Public entry point for ESMF_GridCompSetServices()
   PUBLIC WRF_register

   ! private stuff
   CHARACTER (ESMF_MAXSTR) :: str

CONTAINS


   SUBROUTINE wrf_register(gcomp, rc)
     TYPE(ESMF_GridComp), INTENT(INOUT) :: gcomp
     INTEGER, INTENT(OUT) :: rc
!
!<DESCRIPTION>
!     WRF_register - Externally visible registration routine
!
!     User-supplied SetServices routine.
!     The Register routine sets the subroutines to be called
!     as the init, run, and finalize routines.  Note that these are
!     private to the module.
!
!     The arguments are:
!       gcomp           Component
!       rc              Return code; equals ESMF_SUCCESS if there are no errors,
!                       otherwise ESMF_FAILURE.
!</DESCRIPTION>

     rc = ESMF_SUCCESS
     ! Register the callback routines.
     call ESMF_GridCompSetEntryPoint(gcomp, ESMF_METHOD_INITIALIZE, &
                                     wrf_component_init1, phase=1, rc=rc)
     IF ( rc /= ESMF_SUCCESS) THEN
        CALL wrf_error_fatal ( 'wrf_register:  ESMF_GridCompSetEntryPoint(wrf_component_init1) failed' )
     ENDIF
     call ESMF_GridCompSetEntryPoint(gcomp, ESMF_METHOD_INITIALIZE, &
                                     wrf_component_init2, phase=2, rc=rc)
     IF ( rc /= ESMF_SUCCESS) THEN
        CALL wrf_error_fatal ( 'wrf_register:  ESMF_GridCompSetEntryPoint(wrf_component_init2) failed' )
     ENDIF
     call ESMF_GridCompSetEntryPoint(gcomp, ESMF_METHOD_RUN, &
                                     wrf_component_run,  rc=rc)
     IF ( rc /= ESMF_SUCCESS) THEN
        CALL wrf_error_fatal ( 'wrf_register:  ESMF_GridCompSetEntryPoint(wrf_component_run) failed' )
     ENDIF
     call ESMF_GridCompSetEntryPoint(gcomp, ESMF_METHOD_FINALIZE, &
                                     wrf_component_finalize,  rc=rc)
     IF ( rc /= ESMF_SUCCESS) THEN
        CALL wrf_error_fatal ( 'wrf_register:  ESMF_GridCompSetEntryPoint(wrf_component_finalize) failed' )
     ENDIF
     PRINT *,'WRF:  Registered Initialize, Run, and Finalize routines'

   END SUBROUTINE wrf_register

END MODULE module_wrf_setservices