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Python Design Patterns - Flyweight
Neha Kumawat
2 years ago
Table of Contents
- Introduction
- How to implement the flyweight pattern?
Introduction
The flyweight patterb comes under the structural design patterns category. It provides a way to decrease object count. It includes various features that help in improving application structure. The most important feature of the flyweight objects is immutable. This means that they cannot be modified once constructed. The pattern uses a HashMap to store reference objects.
How to implement the flyweight pattern?
The following program helps in implementing the flyweight pattern −
class ComplexGenetics(object):
def __init__(self):
pass
def genes(self, gene_code):
return "ComplexPatter[%s]TooHugeinSize" % (gene_code)
class Families(object):
family = {}
def __new__(cls, name, family_id):
try:
id = cls.family[family_id]
except KeyError:
id = object.__new__(cls)
cls.family[family_id] = id
return id
def set_genetic_info(self, genetic_info):
cg = ComplexGenetics()
self.genetic_info = cg.genes(genetic_info)
def get_genetic_info(self):
return (self.genetic_info)
def test():
data = (('a', 1, 'ATAG'), ('a', 2, 'AAGT'), ('b', 1, 'ATAG'))
family_objects = []
for i in data:
obj = Families(i[0], i[1])
obj.set_genetic_info(i[2])
family_objects.append(obj)
for i in family_objects:
print ("id = " + str(id(i)))
print (i.get_genetic_info())
print ("similar id's says that they are same objects ")
if __name__ == '__main__':
test()Output
The above program generates the following output −
id = 139699273716368
ComplexPatter[ATAG]TooHugeinSize
id = 139699273718160
ComplexPatter[AAGT]TooHugeinSize
id = 139699273716368
ComplexPatter[ATAG]TooHugeinSize
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