标签：变量 内存占用 contain 共享 obj java ISE 享元模式 actor
享元模式(Flyweight)通过共享技术实现相同或相似对象的重用，可以减少创建对象的数量，以减少内存占用和提高性能。Java String的常量池，python logging，线程池，数据库连接池都用到了享元模式。享元模式与单例模式类似，都具有共享变量的特征。本文通过使用matlab语言对享元模式进行实现。
IFlyweight.m
classdef IFlyweight < handle
methods(Abstract)
print(~);
end
end
Flyweight.m
classdef Flyweight < IFlyweight
properties
color
end
methods
function obj = Flyweight(color)
obj.color = color;
end
function print(obj)
disp("color:"+obj.color)
end
end
end
FlyweightFactory.m
classdef FlyweightFactory < handle
methods(Static)
function res = getFlyweightMap()
persistent flyweightMap;
if isempty(flyweightMap) || ~isvalid(flyweightMap)
flyweightMap = containers.Map();
end
res = flyweightMap;
end
function obj = getFlyweight(color)
flyweightMap = FlyweightFactory.getFlyweightMap();
if(~flyweightMap.isKey(color))
flyweightMap(color) = Flyweight(color);
end
obj = flyweightMap(color);
end
function size = getFlyweightMapSize()
flyweightMap = FlyweightFactory.getFlyweightMap();
size = flyweightMap.length();
end
end
end
测试代码
fw1 = FlyweightFactory.getFlyweight(‘Red‘); fw2 = FlyweightFactory.getFlyweight(‘Blue‘); fw3 = FlyweightFactory.getFlyweight(‘Red‘); fw1.print(); fw2.print(); fw3.print(); disp(FlyweightFactory.getFlyweightMapSize()); clear(‘FlyweightFactory‘);
标签：变量 内存占用 contain 共享 obj java ISE 享元模式 actor
原文地址：https://www.cnblogs.com/usaddew/p/10947139.html
