Implement the Adaptation Preconditions

Create the script mentioned in the chimera_config.yaml file under the preprocessor.module_path.

In the script, declare the subclass mentioned in the chimera_config.yaml file under the preprocessor.class_name

Start with the following code snippet:

# import the parent class from chimera
from chimera.precondition_functions import PreConditionFunctions

# declare the sub class
class <class_name>(PreConditionFunctions):
    def __init__(self, context, pge_config, settings, job_params):
        PreConditionFunctions.__init__(self, context, pge_config, settings, job_params)

The variables you have available throughout this subclass are:

• Context - contents of _context.json of the SciFlo job. You can access it as self._context in the precondition functions

• PGE’s configuration - contents of the respective PGE’s configuration file. Can be accessed as self._pge_config

• Settings file - content of settings.yaml file accessible as self._settings

• Job Params - This is a dictionary that stores all the information gathered during preconditions evaluation. How to utilize it will be described soon. It can be accessed as self._job_params