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Services Classes

Using service classes in software development can help with on readability, maintainability, scalability, and testability.

Here are some of the key points to remembers:

  1. Introduction
    - Motivation for using service classes to encapsulate business logic.
    - Disclaimer about language independence and simplicity of examples.

  2. Service Pattern Clarification
    - Definition and purpose of a service class in the context of encapsulating business logic.
    - Distinction from other architectural patterns and focus on readability and maintainability over framework abstraction.

  3. Core Best Practices
    - Public “process” method: Implementing a single entry-point to enhance clarity and accessibility for new developers and non-technical domain experts.
    - Mark internal methods as “protected”: Improving code interaction and readability by clearly indicating non-public methods.
    - Keep the context outside: Ensuring testability and framework independence by minimizing dependencies on external contexts, such as web requests.

  4. Structural Guidelines
    - Pass required parameters via the constructor: Streamlining service usage and enhancing clarity by avoiding clutter in the process method.
    - Limit write access to class attributes: Maintaining simplicity and reducing unintended side-effects by restricting where class attributes can be modified.
    - Avoid class attributes if possible: Encouraging local scope over global to simplify data flow and debugging.
    - Try to avoid optional parameters and flags: Simplifying logic and reducing complexity by minimizing branching and potential outcomes.

  5. Coding Practices for Clarity and Maintainability
    - Limit your services depth: Avoiding deep nesting of method calls to keep the logic straightforward and understandable.
    - Use docstrings and inline comments: Providing context and explanations to help future developers understand the purpose and implementation details.
    - Explain obscure or innovative implementations: Documenting the rationale behind non-obvious code choices to facilitate future maintenance and refactoring.

  6. Advanced Structuring Techniques
    - Use mixins for inheritance: Leveraging mixins to avoid code duplication and enhance reusability without the overhead of full inheritance.
    - Keep your methods short: Striving for concise methods to improve readability and manageability.

  7. Coding Enhancements
    - Use type-hinting: Increasing code clarity and aiding debugging by specifying expected data types.
    - DRY is about knowledge, not code: Distinguishing between code reuse and the encapsulation of business knowledge to avoid semantic dilution.

  8. Alternative Strategies
    - Finite state machines (FSM) as a pattern for implementing business flows
    - BPM / BPMN

Page last modified: 2024-02-13 10:02:46