模式定義

運(yùn)用共享技術(shù)有效地支持大量細(xì)粒度的對(duì)象

類圖

應(yīng)用場(chǎng)景

如果系統(tǒng)有大量類似的對(duì)象，可以使用享元模式

優(yōu)點(diǎn)

如果系統(tǒng)有大量類似的對(duì)象，可以節(jié)省大量的內(nèi)存及CPU資源

要點(diǎn)總結(jié)

要點(diǎn)總結(jié)

• 如果系統(tǒng)有解耦實(shí)現(xiàn)對(duì)象的代價(jià)問題，Flyweight主要解決面向?qū)ο蟮拇鷥r(jià)問題，一般不觸及面向?qū)ο蟮某橄笮詥栴}
• Flyweight采用對(duì)象共享的做法來降低系統(tǒng)中對(duì)象的個(gè)數(shù)，從而降低細(xì)粒度對(duì)象給系統(tǒng)帶來的內(nèi)存壓力。在具體實(shí)現(xiàn)方面，要注意對(duì)象狀態(tài)的處理
• 對(duì)象的數(shù)量太大從而導(dǎo)致對(duì)象內(nèi)存開銷加大–什么樣的數(shù)量才算大？這需要我們仔細(xì)的根據(jù)具體應(yīng)用情況進(jìn)行評(píng)估，而不能憑空臆斷

Go語言代碼實(shí)現(xiàn)

工程目錄

flyweight.go

package Flyweighttype FlyWeight struct {Name string }func NewFlyWeight (name string) *FlyWeight{return &FlyWeight{Name: name} }type FlyWeightFactory struct {pool map[string]*FlyWeight }func NewFlyWeightFactory() *FlyWeightFactory {return &FlyWeightFactory{pool: make(map[string]*FlyWeight)} }func (f *FlyWeightFactory) GetFlyWeight (name string) *FlyWeight {weight, ok := f.pool[name]if !ok {weight = NewFlyWeight(name)f.pool[name] = weight}return weight }

flyweight_test.go

package Flyweightimport "testing" import "github.com/stretchr/testify/assert"func TestFlyWeightFactory_GetFlyWeight(t *testing.T) {factory := NewFlyWeightFactory()hong := factory.GetFlyWeight("hong beauty")xiang := factory.GetFlyWeight("xiang beauty")assert.Len(t, factory.pool, 2)assert.Equal(t, hong, factory.pool["hong beauty"])assert.Equal(t, xiang, factory.pool["xiang beauty"]) } 《新程序員》：云原生和全面數(shù)字化實(shí)踐50位技術(shù)專家共同創(chuàng)作，文字、視頻、音頻交互閱讀

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