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Python’s object oriented design features allows considerable flexibility in how we design and structure our suite definition.

Each suite will have a different set of forces which determine how it should be designed.

Lets consider how we would design the tutorial examples in a more object oriented manner. We start with some design criteria we must meet.

  • The default variables (ECF_HOME,etc) must be configurable and independent of the suites
  • New suites must enable automatic job creation checking
  • We need to write out definition as a separate file
  • New suites should be able to re-use the “boiler plate” code defined by the above requirements

Here is possible design, that uses inheritance and the template design pattern:

import os
import ecflow  

class DefaultVariables(object):
    """Provide the setup variables for each suite"""
    def add_to(self, node):
        """Adds ECF_INCLUDE,ECF_HOME to the input node"""
        node.add_variable("ECF_INCLUDE", os.path.join(os.getenv("HOME"),  "course"))
        node.add_variable("ECF_HOME", os.path.join(os.getenv("HOME"),  "course"))

class BaseSuiteBuilder(object):
    """Abstract class. Add default variables to suite and enable job creation 
 checking for any derived suite
    def __init__(self, default_variables):
        self.defs = ecflow.Defs()
        # use derived class name as suite name
        self.suite = self.defs.add_suite(type(self).__name__) 
    def _build_definition_hook(self):
        """Derived suite should override this function to build the suite
 Should not be called explicitly. How could we enforce this ?
    def setup(self):
        """Template/skeleton function. 
 Provides common algorithm for *all* derivatives
 Uses Hollywood principle.
        # Build the suite
        # check job creation. Could use an assert
        job_check_result = self.defs.check_job_creation()
        if len(job_check_result) != 0:
            print("Job creation failed\n" + job_check_result)
        # Check trigger expressions and limit references"
        # Allows definition creation to be separated from the load
        # Use the class name as the name of the definition file
        self.defs.save_as_defs( type(self).__name__ + ".def")
class SuiteBuilder(BaseSuiteBuilder):
    """My example suite. Generates SuiteBuilder.def"""
    def __init__(self, default_variables):
        BaseSuiteBuilder.__init__(self, default_variables)
    def _build_definition_hook(self):
        f1 = self.suite.add_family("family")

class TestSuite(BaseSuiteBuilder):
    """My test suite. Generates TestSuite.def"""
    def __init__(self, default_variables):
        BaseSuiteBuilder.__init__(self, default_variables)
    def _build_definition_hook(self):

if __name__ == "__main__":

    my_suite = SuiteBuilder(DefaultVariables())

    my_test_suite = TestSuite(DefaultVariables())
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