mirror of
https://github.com/crazybber/go-pattern-examples.git
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finish flyweight pattern
This commit is contained in:
Edward
parent
12d826336d
commit
82d8c7cf02
75
.vscode/settings.json
vendored
75
.vscode/settings.json
vendored
@ -1,36 +1,41 @@
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{
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{
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"editor.tabSize": 2,
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"editor.tabSize": 2,
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"files.trimTrailingWhitespace": true,
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"files.trimTrailingWhitespace": true,
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"files.insertFinalNewline": true,
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"files.insertFinalNewline": true,
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"extensions.ignoreRecommendations": true,
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"extensions.ignoreRecommendations": true,
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"workbench.colorCustomizations": {
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"workbench.colorCustomizations": {
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"activityBar.background": "#759570",
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"activityBar.background": "#759570",
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"activityBar.activeBorder": "#cfd3ef",
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"activityBar.activeBorder": "#cfd3ef",
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"activityBar.foreground": "#e7e7e7",
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"activityBar.foreground": "#e7e7e7",
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"activityBar.hoverBackground": "#352cea",
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"activityBar.hoverBackground": "#352cea",
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"activityBar.inactiveForeground": "#e7e7e799",
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"activityBar.inactiveForeground": "#e7e7e799",
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"activityBarBadge.background": "#cfd3ef",
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"activityBarBadge.background": "#cfd3ef",
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"activityBarBadge.foreground": "#15202b",
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"activityBarBadge.foreground": "#15202b",
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"titleBar.activeBackground": "#5e7959",
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"titleBar.activeBackground": "#5e7959",
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"titleBar.inactiveBackground": "#5e795999",
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"titleBar.inactiveBackground": "#5e795999",
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"titleBar.activeForeground": "#e7e7e7",
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"titleBar.activeForeground": "#e7e7e7",
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"titleBar.inactiveForeground": "#e7e7e799",
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"titleBar.inactiveForeground": "#e7e7e799",
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"statusBarItem.hoverBackground": "#352cea",
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"statusBarItem.hoverBackground": "#352cea",
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"statusBar.foreground": "#e7e7e7",
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"statusBar.foreground": "#e7e7e7",
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"panel.border": "#759570",
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"panel.border": "#759570",
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"sideBar.border": "#759570",
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"sideBar.border": "#759570",
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"editorGroup.border": "#759570"
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"editorGroup.border": "#759570"
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},
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},
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"go.languageServerFlags": [],
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"go.languageServerFlags": [],
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"go.lintOnSave": "file",
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"go.lintOnSave": "file",
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"go.vetOnSave": "package",
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"go.vetOnSave": "package",
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"go.useCodeSnippetsOnFunctionSuggest": true,
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"go.useCodeSnippetsOnFunctionSuggest": true,
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"go.testFlags": ["-v"],
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"go.testFlags": [
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"go.testTimeout": "10s",
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"-v"
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"go.formatTool": "goimports",
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],
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"cSpell.allowCompoundWords": true,
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"go.testTimeout": "10s",
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"editor.codeActionsOnSave": {
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"go.formatTool": "goimports",
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"source.organizeImports": true
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"cSpell.allowCompoundWords": true,
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},
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"editor.codeActionsOnSave": {
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}
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"source.organizeImports": true
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//https://vscode.readthedocs.io/en/latest/getstarted/settings/
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},
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"fileheader.Author":"Edward",
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"fileheader.tpl": "/* \r\n * @Description: https://github.com/crazybber \r\n * @Author: {author} \r\n * @Date: {createTime} \r\n * @Last Modified by: {lastModifiedBy} \r\n * @Last Modified time: {updateTime} \r\n */\r\n",
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"fileheader.LastModifiedBy": "Edward"
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}
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//https://vscode.readthedocs.io/en/latest/getstarted/settings/
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@ -1,4 +1,19 @@
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# 享元模式
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# 享元模式
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享元模式从对象中剥离出不发生改变且多个实例需要的重复数据，独立出一个享元，使多个对象共享，从而节省内存以及减少对象数量。
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享元模式是细粒度控制主体构成的一种方式，英文叫 flyweight，单词分开看反倒更容易理解，fly-weight,看起来是要消减对象的大小/重量(size/weight),对！就是这个意思!抽取对象中的不变部分，使其能够容易的被复用或者共用，进而能够减小内存占用，优化性能，提高运行时效率，比如，会减少对象在内存分配/克隆时的空间大小，减小对象内存占用损耗，缩短响应时间等。
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注意：实际上完整的享元模式，包含两部分可以被共享的部分，不可以被共享部分，两者组合起来才构成一个完整的整体，设计享元模式，严谨的讲需要针对可共享部分与不可共享两部分设计接口。
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单纯享元模式：在单纯享元模式中，所有的具体享元类都是可以共享的，不存在非共享具体享元类。
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复合享元模式：将一些单纯享元对象使用组合模式加以组合，还可以形成复合享元对象，这样的复合享元对象本身不能共享，但是它们可以分解成单纯享元对象，而后者则可以共享。
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享元的的可共享部分在程序是设计，一般是集中管理的，一般设计为一个存储map的，享元的不可共享部分，一般是即用即创建，完全的专有模式.
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现实生活中的快递送货任务就一个很好的享元模式，快递公司的快递员是共享的，并且可以重复使用，快递公司不可能送一个快递雇一个快递员，否则，这个代价太大巨大了，但是快递员送的包裹是不一样，这是每个人的私有物品，所以不变的快递员+一直在变化的快递，才能构成一次完整的送货任务。
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@ -1,59 +1,73 @@
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package flyweight
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package flyweight
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import "fmt"
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/*
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* @Description: github.com/crazybber
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* @Author: Edward
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* @Date: 2020-05-01 18:10:57
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* @Last Modified by: Edward
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* @Last Modified time: 2020-05-01 19:38:21
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*/
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import (
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"fmt"
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)
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type ImageFlyweightFactory struct {
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//IDeliverCompany 公司的能力
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maps map[string]*ImageFlyweight
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type IDeliverCompany interface {
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//雇人
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Hire(name string)
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//送货任务
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DeliverTask(name string, packets []string)
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GetDeliver(name string) IDeliver
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}
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}
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var imageFactory *ImageFlyweightFactory
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//DeliverCompany 快递公司
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type DeliverCompany struct {
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Employees map[string]IDeliver
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}
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func GetImageFlyweightFactory() *ImageFlyweightFactory {
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//IDeliver 快递员能做的事情
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if imageFactory == nil {
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type IDeliver interface {
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imageFactory = &ImageFlyweightFactory{
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//送货
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maps: make(map[string]*ImageFlyweight),
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DeliverPackets(packets []string)
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}
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}
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//Deliver 快递员工,员工是一个享元对象
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type Deliver struct {
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Name string //快递员的名字
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Packets []string //快递员的携带的快递，这一部分是变化的
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}
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//Hire 雇佣新员工，员工是全公司共享
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func (d *DeliverCompany) Hire(name string) {
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if d.Employees == nil || len(d.Employees) == 0 {
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d.Employees = make(map[string]IDeliver)
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}
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}
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return imageFactory
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if _, ok := d.Employees[name]; ok {
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}
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fmt.Println("already hired")
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return
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func (f *ImageFlyweightFactory) Get(filename string) *ImageFlyweight {
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image := f.maps[filename]
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if image == nil {
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image = NewImageFlyweight(filename)
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f.maps[filename] = image
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}
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}
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d.Employees[name] = &Deliver{Name: name}
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return image
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fmt.Println("hired")
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}
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}
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type ImageFlyweight struct {
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//GetDeliver return Deliver
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data string
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func (d *DeliverCompany) GetDeliver(name string) IDeliver {
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return d.Employees[name]
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}
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}
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func NewImageFlyweight(filename string) *ImageFlyweight {
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//DeliverTask 派员工送货
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// Load image file
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func (d *DeliverCompany) DeliverTask(name string, packets []string) {
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data := fmt.Sprintf("image data %s", filename)
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return &ImageFlyweight{
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d.Employees[name].DeliverPackets(packets)
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data: data,
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}
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}
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}
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func (i *ImageFlyweight) Data() string {
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//DeliverPackets 送货了
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return i.data
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func (d *Deliver) DeliverPackets(packets []string) {
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}
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type ImageViewer struct {
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fmt.Println(d.Name, ": Delivered:", packets)
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*ImageFlyweight
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}
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func NewImageViewer(filename string) *ImageViewer {
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image := GetImageFlyweightFactory().Get(filename)
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return &ImageViewer{
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ImageFlyweight: image,
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}
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}
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func (i *ImageViewer) Display() {
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fmt.Printf("Display: %s\n", i.Data())
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}
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}
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@ -1,19 +1,54 @@
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/*
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* @Description: github.com/crazybber
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* @Author: Edward
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* @Date: 2020-05-01 17:24:28
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* @Last Modified by: Edward
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* @Last Modified time: 2020-05-01 19:45:32
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*/
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package flyweight
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package flyweight
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import "testing"
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import (
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"fmt"
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"testing"
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)
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func TestDeliveryPackets(t *testing.T) {
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dc := &DeliverCompany{Employees: make(map[string]IDeliver)}
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dc.Hire("bob")
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dc.Hire("lily")
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dc.Hire("bob")
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deliver1 := dc.GetDeliver("lily")
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deliver2 := dc.GetDeliver("lily")
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dc.DeliverTask("lily", []string{"box1", "box2"})
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dc.DeliverTask("lily", []string{"box6", "box7", "box8"})
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deliver2.DeliverPackets([]string{"box9", "box10", "box11"})
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deliver1.DeliverPackets([]string{"box12"})
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func ExampleFlyweight() {
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viewer := NewImageViewer("image1.png")
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viewer.Display()
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// Output:
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// Display: image data image1.png
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}
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}
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func TestFlyweight(t *testing.T) {
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func TestDeliverEmployee(t *testing.T) {
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viewer1 := NewImageViewer("image1.png")
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dc := &DeliverCompany{Employees: make(map[string]IDeliver)}
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viewer2 := NewImageViewer("image1.png")
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if viewer1.ImageFlyweight != viewer2.ImageFlyweight {
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dc.Hire("bob")
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t.Fail()
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dc.Hire("lily")
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deliver1 := dc.GetDeliver("lily")
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deliver2 := dc.GetDeliver("lily")
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dp1 := fmt.Sprintf("%p", deliver1)
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dp2 := fmt.Sprintf("%p", deliver2)
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if dp1 != dp2 {
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t.Error(dp1, "not the same with", dp2)
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}
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}
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}
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}
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