Libraries

Libraries is a set of classes/functions that provides reusable functionalities. The client usually calls the libraries to perform some tasks like system structure controls and flow.

A library function executes based on the given input and return the output.

When to Use (Problem)

• When the source codes has many reusable code patterns all over the places.
• When the reusable code patterns are reusable across different source codes from different project.

Example (Solution)

• Abstract the common codes with common purpose and package them under a single purpose library.
• Always functionalize or classify those common source codes.
• Public vs. Private interface design applies.
• Ensure all interfaces are stubble or mockable for isolated testing.

Expected Outcome (Consequences)

• Reusable source codes in a package.
• Less duplication.
• Low coupling maintenance. Package can be upgraded independently.