Flyweight Design Pattern

Videos

Section	Video Links
Flyweight Overview
Flyweight Use Case
String Justification

Book

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Overview

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Terminology

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Flyweight UML Diagram

Source Code

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Output

python ./flyweight/flyweight_concept.py
abracadabra
abracadabra has 11 letters
FlyweightFactory has 5 flyweights

Example Use Case

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Example UML Diagram

Output

python ./flyweight/client.py    
-----------------------------------------
|abra       |     112233    |    cadabra|
|racadab    |     12345     |     332211|
|cadabra    |     445566    |   aa 22 bb|
-----------------------------------------
FlyweightFactory has 12 flyweights

New Coding Concepts

String Justification

In /flyweight/column.py, there are commands center(), ljust() and rjust() .

These are special commands on strings that allow you to pad strings and align them left, right, center depending on total string length.

eg,

>>> "abcd".center(10)
'   abcd   '

>>> "abcd".rjust(10)  
'      abcd'

>>> "abcd".ljust(10) 
'abcd      '

Summary

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