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    1. COImportant is that you should not confuse the word _model_. A _model_ is typically the whole set of classes, a _class_ is a type in the model, where attributes and methods for that type are defined. An _object_ is a concrete example (or instance) of a class and has a value for each attribute of the class. At runtime there can be many objects of one class. So if you compare two things, that're always objects. Regarding your question: I don't know Yii (so this is no answer), but the standard OOP rule is to implement class-specific behavior in the class.
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    2. COThen I fear the topic is not really language-agnostic. If you'd use a language with an "abstract class" concept, my solution were suitable. I'm afraid that I have no better idea for Python. You could stick to that OOP way anyway, and always use it correctly because you know what you do. But then there is not only one way to create a Report instance. I think you will have to opt for the lesser evil :)
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    3. COIf I understand Stephen right, what he means is that your server side code sends heartbeats to the client via a callback. Let's assume you set the heartbeat to 10 seconds. Then you could define a timeout of 35 seconds. If the server doesn't start to execute its code, then no heartbeat is sent as well and the timeout occurs. On the other side, if the server can successfully start, the (long-running) process is beeing executed while sending heartbeats to prevent a timeout.
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