Dp Flyweight

In this tutorial, you'll learn about How to Fix Flyweight Errors. We cover key concepts, practical examples, and best practices.

Fix flyweight errors when duplicate objects created for every instance wasting memory.

Quick Fix

Wrong

class Char:
    def __init__(self,ch,font,size,color):
        self.ch=ch; self.font=font; self.size=size; self.color=color
text=[Char(c,'Arial',12,'red') for c in 'hello']

Shared intrinsic state (font,size) duplicated per character. Memory waste.

Right

class CharFlyweight:
    def __init__(self,ch,font,size):
        self.ch=ch; self.font=font; self.size=size
    def render(self,color): print(f'{self.ch} {self.font} {self.size} {color}')
class CharFactory:
    _cache={}
    @classmethod
    def get(cls,ch,font,size):
        key=(ch,font,size)
        if key not in cls._cache:
            cls._cache[key]=CharFlyweight(ch,font,size)
        return cls._cache[key]
f=CharFactory
text=[f.get(c,'Arial',12) for c in 'hello']
for c in text: c.render('red')

Intrinsic (shared) state: ch, font, size. Extrinsic (unique) state: color passed at runtime.

Prevention

Share intrinsic state across objects. Extrinsic state computed or passed on use.

DodaTech Tools

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