Using the ExtData component: Difference between revisions

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MAPL_ExtDataGridCompMod is an internal MAPL gridded component used to fulfill imports fields in a MAPL hierarchy from netcdf files on disk. It is usually one of the three gridded components in the cap or main program of a MAPL application, the others being the root of the MAPL hierarchy it is servicing and MAPL_HistoryGridCompMod. It is instanciated and all its registered methods are run automatically by the CAP. MAPL_ExtDataGridCompMod will provide data to fields in the Import states of MAPL components that are not satisfied by a MAPL_AddConnectivity call in the MAPL

hierarchy. In a MAPL application fields added to the Import state of a component are passed up the MAPL hierarchy looking for a connectivity to another component that will provide data to fill the import. If a connectivity is not found these fields will eventually reach the cap. At this point any fields that have not have their connectivity satisfied are passed to the MAPL_ExtDataGridCompMod through its Export state. MAPL_ExtDataGridCompMod is in essence a provider of last resort for Import fields that need to be filled with data. The graphic below illustrates this point.

[[File:ExtData_example.png]]

The user provides a resource file available to the MAPL_ExtDataGridCompMod GC.

At its heart this resource file provides a connection between a field name and a variable name in

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 MAPL_ExtDataGridCompMod is an internal MAPL gridded component used to fulfill imports fields in a MAPL hierarchy from netcdf files on disk. It is usually one of the three gridded components in the cap or main program of a MAPL application, the others being the root of the MAPL hierarchy it is servicing and MAPL_HistoryGridCompMod. It is instanciated and all its registered methods are run automatically by the CAP. MAPL_ExtDataGridCompMod will provide data to fields in the Import states of MAPL components that are not satisfied by a MAPL_AddConnectivity call in the MAPL
 hierarchy. In a MAPL application fields added to the Import state of a component are passed up the MAPL hierarchy looking for a connectivity to another component that will provide data to fill the import. If a connectivity is not found these fields will eventually reach the cap. At this point any fields that have not have their connectivity satisfied are passed to the MAPL_ExtDataGridCompMod through its Export state. MAPL_ExtDataGridCompMod is in essence a provider of last resort for Import fields that need to be filled with data. The graphic below illustrates this point.
 [[File:ExtData_example.png]]
 The user provides a resource file available to the MAPL_ExtDataGridCompMod GC.
 At its heart this resource file provides a connection between a field name and a variable name in