.. This work is licensed under a Creative Commons Attribution 3.0 Unported License. http://creativecommons.org/licenses/by/3.0/legalcode .. This template should be in ReSTructured text. The filename in the git repository should match the launchpad URL, for example a URL of https://blueprints.launchpad.net/heat/+spec/awesome-thing should be named awesome-thing.rst . Please do not delete any of the sections in this template. If you have nothing to say for a whole section, just write: None For help with syntax, see http://sphinx-doc.org/rest.html To test out your formatting, see http://www.tele3.cz/jbar/rest/rest.html =================================== Class-based Scenario Implementation =================================== Introduce scenarios implementation as classes, not methods. Problem description =================== Current scenario implementation transforms method to class at runtime, so this overcomplicates the code. Method-based extensions mechanism is not a common practice in frameworks, so this is a bit confusing. Most Rally plugins like Context, SLA, Runner, OutputChart (except Scenario) are implemented as classes, not methods. Proposed change =============== Add an ability to implement scenarios as classes, keeping full backward compatibility with existing code. This means that class represents single scenario which is actually implemented in method *Scenario.run()*. So input task can contain scenario names that does not have method part split by dot from class part. For example, here we have two scenarios, first one is in old manner and another is class-based: .. code-block:: json { "Dummy.dummy": [ { "runner": { "type": "serial", "times": 20 } } ], "another_dummy_scenario": [ { "runner": { "type": "serial", "times": 20 } } ] } Class AnotherDummyScenario should have method run(): .. code-block:: python from rally.task import scenario @scenario.configure(name="another_dummy_scenario") class AnotherDummyScenario(scenario.Scenario): def run(self): """Scenario implementation.""" Modules *rally.task.engine* and *rally.task.processing* should be modified to make them working with class-based scenarios. Alternatives ------------ None Implementation ============== Assignee(s) ----------- Primary assignee: Alexander Maretskiy Work Items ---------- - Update task.engine and task.processing for class-based scenarios - Transform all Dummy scenarios into class-based implementations as first stage of usage class-based scenarios. Dependencies ============ None