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| | * Edit the parameter file ( parameters.py ) to activate and schedule your the activity. | | * Edit the parameter file ( parameters.py ) to activate and schedule your the activity. |
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| − | == Explaining an Example Setup == | + | == Explaining an Example == |
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| − | Reading the section on design as well may help understand this section. | + | Reading the section on architecture may help understand this section. |
| − | === Parameters ===
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| − | The general parameter setup is explained in [[Configuration Files For Python]] and another example of its uses is discussed in [[Smart Terminal Parameter Examples]] There are additional features of the parameter setup here:
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| − | * The additional use of a global dict is different in this application.
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| − | * Most of the parameters are set up almost as soon as the application starts, but a second set of parameters is run from the processing_helper ( if any ) to set up additional parameters. This setup is delayed so that it can reference objects that have not be created until near the end of the application initialization. It is in the method: init_from_helper( ).
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| − | === A Dictionary ===
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| − | Each scheduling activity may have its own ( but sharable ) set of parameters for that activity. These are stored in a dictionary, which is in turn stored in a master dictionary of all activity parameters. It is set up in parameters.py and is called: AppGlobal.parameter_dicts. When an event related function is called it is passed the name of the dictionary ( a string ) in AppGlobal.parameter_dicts and it gets out the correct dictionary it needs as in:
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| − | a_dict = AppGlobal.parameter_dicts[ a_dict_name ]
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| − | then individual elements are fetched as in:
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| − | my_count = a_dict["failed_connect_count"]
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| − | To keep the creation of a dictionary in one controllable spot I typically do it in its own method
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| − | <pre>
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| − | # ------------------------------------
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| − | def create_parm_dict_greenhouse( self, ):
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| − | dict_name = "greenhouse"
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| − | a_dict = {}
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| − | a_dict["db_host"] = '192.168.0.189' #
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| − | a_dict["db_port"] = 3306
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| − | a_dict["db_db"] = 'pi_db'
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| − | a_dict["db_user"] = 'pi_user'
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| − | a_dict["db_passwd"] = 'db_passwrd here'
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| − | a_dict["sql_select"] = "SELECT ev_time, temp_1, humid_1 FROM ev_data WHERE ( ev_time > %s ) order by temp_1 asc"
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| − | a_dict["select_timedelat"] = datetime.timedelta( days= 0, hours = 0, minutes = 30 )
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| − | a_dict["alarm_min_temp"] = 50 # farenheight
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| − | a_dict["alarm_max_temp"] = 75
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| − | a_dict["failed_connect_count"] = 0
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| − | a_dict["max_connect_count"] = 4 # at 4 trigges an email
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| − | a_dict["min_repeat_email_time"] = datetime.timedelta( days= 1, hours = 0, minutes = 0 )
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| − | a_dict["time_last_email"] = None
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| − | AppGlobal.parameter_dicts[dict_name] = a_dict
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| − | </pre>
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| | = Install = | | = Install = |
