event handling - DDD: How to solve this using Domain-Driven design? -


i'm new ddd , cutting teeth on following exercise. use case real, attempt solve ddd purely learning.

we have multiple git repos, each containing file call product spec. system needs respond http post cloning repos, , update product spec in match information in post body. system needs log post request cause updating product spec.

i'd use aggregates , event sourcing solving problem because seem fit. event sourcing comes automatic persistence of commands, if convert post body command, auditing free.

problem is, post may match multiple product spec. i'm not sure how deal that. should create domain service, let find matching product spec , issue update command each? or should have aggregate root so? if using aggregate root update multiple entities, needs entity, in problem domain?

the first comment question right (the 1 of @voiceofunreason): 'is side effect coordination'. try answer question: how solve using ddd / event sourcing:

  1. the first aggregate root named: 'multiplerepooperations'. aggregate root has 1 stream of events.
  2. the command fires whole process be: 'cloneandupdateprodspecrepos' carries list of repos cloned , updated.
  3. when aggregate root processes command spit bunch of events of type 'userrequestedtocloneandupdateprodspec'
  4. the second bounded context manages repos, , subscribed events 'multiplerepooperations' , receive each event emitted it. bounded context aggregate root can called: 'gitrepomanagement', , has stream per repo. eg: gitrepomanagement-repo1, gitrepomanagement-repo215, gitrepomanagement-20158, etc.
  5. 'gitrepomanagement' receives each event of type 'userrequestedtocloneandupdateprodspec', replays corresponding repo stream in order rehydrate current state, , tries clone , update product spec repo. when fails emits failed event or suceed if appropiate.

Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer
Read more

jquery - Responsive Navbar with Sub Navbar -

good day, forgive me nav vocabulary not best. if question confusing apologize. i'm working on navigation bar needs centered on page @ 768px , above. items in nav open (or perhaps toggle) subnav lives directly below. these nav should appear centered on page. i have been able work through responsive portion of nav bar, having main items align vertically , sub nav menu of each item roll out below, , gave them indent separation. working well. however, issue not responsive side, behavior @ width greater 768px. happens toggling menu's sub navigation pushes other main items down page below sub nav. here's code: $(document).ready(function () { //stick in fixed 100% height behind navbar don't wrap $('#slide-nav.navbar-inverse').after($('<div class="inverse" id="navbar-height-col"></div>')); $('#slide-nav.navbar-default').after($('<div id="navbar-height-col"></d
Read more