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Tag Archive for patterns-and-practices

Is it appropriate for a class to only be a collection of information with no logic?

Say I have a class Person that has instance variables age, weight, and height, and another class Fruit that has instance variables sugarContent and texture. The Person class has no methods save setters and getters, while the Fruit class has both setters and getters and logic methods like calculateSweetness. Is the Fruit class the type of class that is better practice than the Person class. What I mean by this is that the Person class seems like it doesn’t have much purpose; it exists solely to organize data, while the Fruit class organizes data and actually contains methods for logic.

Is there some software to manage a XP Project? [closed]

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Design patterns to avoiding breaking the SRP while performing heavy data logging

A class that performs both computations and data logging* seems to have at least two responsibilities. Given a system for which the specifications require heavy data logging, what kind of design patterns or architectural patterns can be used to avoid bloating all the classes with logging calls every time they compute something?

Holding mutable data in a single place

Given a mutable property, it generally makes sense to only hold/store that property in a single place. When the data needs to change you only need to update a single field, and you can completely avoid bugs where the different fields get out of sync.

Database connection – should they be passed as parameter?

We have a system whereby the database connection is get once using a common method, and being pass throughout the relevant class to be used. There are doubts that passing the database connection as a parameter to different classes would cause problem, so i’m checking here to see whether this is actually viable, and are there any better patterns to do it?