~~~ /* Flyweight 享元模式： 運用共享技術有效地支持大量細粒度的對象 個人想法：主要思想是共享，將可以共享的部分放在對象內部， 不可以共享的部分放在外邊，享元工廠創建幾個享元對象就可以了， 這樣不同的外部狀態，可以針對同一個對象，給人感覺是操作多個對象， 通過參數的形式對同一個對象的操作，像是對多個對象的操作 作者： HCLAC 日期： 20170311 */ package flyweight import ( "fmt" ) // 享元對象接口 type IFlyweight interface { Operation(int) //來自外部的狀態 } // 共享對象 type ConcreteFlyweight struct { name string } func (c *ConcreteFlyweight) Operation(outState int) { if c == nil { return } fmt.Println("共享對象響應外部狀態", outState) } // 不共享對象 type UnsharedConcreteFlyweight struct { name string } func (c *UnsharedConcreteFlyweight) Operation(outState int) { if c == nil { return } fmt.Println("不共享對象響應外部狀態", outState) } // 享元工廠對象 type FlyweightFactory struct { flyweights map[string]IFlyweight } func (f *FlyweightFactory) Flyweight(name string) IFlyweight { if f == nil { return nil } if name == "u" { return &UnsharedConcreteFlyweight{"u"} } else if _, ok := f.flyweights[name]; !ok { f.flyweights[name] = &ConcreteFlyweight{name} } return f.flyweights[name] } func NewFlyweightFactory() *FlyweightFactory { ff := FlyweightFactory{make(map[string]IFlyweight)} ff.flyweights["a"] = &ConcreteFlyweight{"a"} ff.flyweights["b"] = &ConcreteFlyweight{"b"} return &ff } ~~~