DDD & Microservices. Complex business logic Ubiquitous language. Domain-driven Design Domain modeling. At last, some boundaries!
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1 omplex usiness logic Uiquitous lnguge Domin-driven Design Domin modeling DDD & Microservices t lst, some oundries! ric dominlnguge.com
2 drin ockcroft You sy ndwgon like it s d thing!
3 Why do I like microservices? utonomous tems with isolted implementtion. cknowledge the rough nd tumle of enterprises. ttle not pets. philosophicl rek from the pst gives us chnce to shke ssumptions. ut! Different people men different things.
4 Services nd Messges S m m m m m m
5 m m m m m m
6 How do they understnd the messges?
7 ounded ontext context The setting in which word or sttement ppers tht determines its mening ounded context The conditions under which prticulr model is defined nd pplicle.
8 ontext Mp trnsltor prtners ounded contexts
9 ontext Mp prtners
10 symmetricl Reltionships ontext Nme reltionship ontext Nme (point towrd power)
11 ontext Mp prtners
12 ontext Mp prtners
13 D ontext Mp prtners
14 D ontext Mp D prtners
15 D ontext Mp D prtners
16 D ontext Mp D prtner s
17 D ontext Mp D prtner s
18 D f ontext Mp D prtner s
19 D f ontext Mp D prtners
20 enterprise model shred dtse schem unified field theory one ring There re lwys multiple models.
21 Models need to e cler, not ig. Useful models need crisp definitions. Definitions require cler context. Useful models need simple ssertions. ssertions require oundries.
22 D f ontext Mp D prtners
23 D f ontext Mp D prtners
24 D f ontext Mp D om prtners
25 D f ontext Mp D om om prtners
26 D f e e e e e ontext Mp iction! Mp wht is. D om om prtners
27 D f e e e e e ontext Mp Wht cn e done? D om om prtners om
28 Not ll of lrge system will e well designed.
29 D f e e e e e ontext Mp Mitigtion D om om?????? prtners om
30 D f e e e e e ontext Mp D om om prtners om
31 Microservice s ontext oundry llow high-concept modeling in messy world. llow specilized models for distinct prolems. Mitigte consequences of design mistkes. cknowledge the rough nd tumle of enterprises. ut Very interesting stuff is not inside the services!
32 Interchnge context
33 D f ontext Mp D prtners
34 D f i i i i i i i i i i i ontext Mp D prtners
35 D f i i i i i i i i i i i ontext Mp D I prtners
36 ` reltively generic dt model for shring. or plce to model protocols of interction. Modeling nd design of higher-level solutions. domin lnguge tuned to these purposes.
37 Interchnge ontext xpressed in terms of service interfces/messges. Distinct from the ojects/functions of the internls of service. Prevents distortion/freezing of erly-dominnt contexts. Gives ig-picture understnding when we hve mny services. Usully more thn one! (void enterprise model.)
38 Why not logicl oundries? Smrt people I respect point out tht most of wht I wnt is the logicl prtitioning of the system. We ve hd decdes to get tht to work. Some techniques re too sutle to survive the rough nd tumle.
39 Wrp up Sutle design (such s DDD) requires concrete oundries. Microservices hve them. Prolifertion of services recrete some of the old prolems. ontext Mps help visulize nd communicte out those prolems. Modest use of interchnge contexts cn help produce coherent sets of microservices.
40 Not ll of lrge system will e well designed.
41 DDD & Microservices t lst, some oundries! ric dominlnguge.com
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