MAPL3 will use the new ESMF_HConfig type to store resource values that previously the ESMF_Config type stored.

Behavior

Sketch

• MAPL_ResourceGet (MRG) => ESMF_HConfigAs...
• MRG gets value if keystring exists in hconfig.
• If hconfig does not contain keystring,
  • return default if it is present in input arguments.
  • throw error otherwise.

Plan

• New module for low level
• High level in MAPL_Generic
• Low-level returns a non-optional string for the parameter.
• Return information about hconfig vs default value.
• High-level tracks component.
• High-level tracks which resources have been queried already.

Key Ideas

YAML value vs HConfig value vs Program value vs Checkpoint value.

• YAML value (file) does not change.
• HConfig value does not change.
• Program value can change.
• Program value is recorded for checkpoint.