Logistics eCommerce model: Model modularity

Let's take the example of the e-Commerce model used before, where we have three main groups of processes:

1. Managing requests
2. Packaging
3. Shipping & delivery

To ensure the model is modular and processes can be easily added and removed, processes have been defined in separate functions and generators: def process_1_manage_requests(): def process_2_packaging(): def process_3_shipping_delivery():

Once these process generators have been defined, the generator def generator_all_processes(env) has been created to (1) call each of the individual process generators and (2) clock in their duration in chronological order.