2018年基于FP的DDD实践.pdf

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1、?FP?DDD?CONTENTS01DDD?FP02?03?DDD?FPDDD?FPCQRSUse CaseUser StoryDCIDomain EventEvent SourcingEvent StormingClean ArchitectureOnion ArchitectureTDDHexagonal ArchitectureMicroserviceOO?领域模型是为构建的种向领域的指性语义 选择某种编程范式就选定了构建领域模型的基础 程上需要考量哪种编程范式与领域语义的 gap 最 现代编程语基本都持多范式，程序员可以在局部灵活选择FP?DDD?业务场景：规则领域，计算领域 设计层次

2、：BC内建模，战术设计 建模元素：值对象，领域服务?1?UL?数：counting 三形：triangle 点：point 线：line 点的集合：points 线的集合：lines?counting trianglecountingtriangle?Pointtype Point=bytetype Line=string?Line?:3PointPointa,b,c?:3LineLineab,bc,acUL?数：counting 三形：triangle 点：point 线：line 点的集合：points 线的集合：lines 两点相连：connected 三点在同直线上：in_same_l

3、ine：not?counting trianglecountingtriangleconnectedin_same_linenotconneted&in_same_line?:connected(x,y)?in_same_line(x,y,z)n?lines?belong(points,lines):(Points,Line)-boolbelong?:connected(x,y)-belong(“xy”,lines)in_same_line(x,y,z)-belong(“xyz”,lines)UL?数：counting 三形：triangle 点：point 线：line 点的集合：point

4、s 线的集合：lines 两点相连：connected 三点在同直线上：in_same_line：not 属于：belong?counting trianglecountingtriangleconnectedin_same_linenotbelong?:points?linestype Points=stringpoints:=abcdefghijk lines:=Lineabh,acgi,adfj,aek,bcde,hgfe,hijk?:?UL?数：counting 三形：triangle 点：point 线：line 点的集合：points 线的集合：lines 两点相连：connect

5、ed 三点在同直线上：in_same_line：not 属于：belong 序集：subset遍历：traversal?counting trianglecountingtriangleconnectedin_same_linenotbelongsubsettranversalsubset(a,b,c)-“abc”Pointa,b,c-Points(Pointa,b,c)subset(points,n):(Points,int)-Points“abc”?subset(points,3)subset(points,n)when len(points)?subset(points,n)when l

6、en(points)=n-pointssubset(points,n)when n=1-points0,points1,.,pointslen(points)-1subset(points,n)-firsts=subset(points1:,n-1)with points0 lasts=subset(points1:,n)firsts append lasts?model?subset(points,3)?domain service?subset(points,3)?2?UL?数：counting 三形：triangle 点：point 线：line