Kris Leech krisleech


    
    View pres.rb 
  
  
    File suppressed. Click to show.
  
  
            1
            2
            3
            4
            5
            6
            7
            8
            9
            10
          
          
            # given these models
 
class Study < AR::Base
  class Site < AR::Base
    class Visit < AR::Base
    end
  end
end
 
Study::Site::Visit

          
    View locking.md 
  
  
    File suppressed. Click to show.
  
  
Data referenced in code

Sometimes data is referenced in code, for example a dynamically created "tab" has a key (it's unique id).

If we want to fetch that tab in our code, we do Tab.find_by_key('organisations').  This will break if a user deletes this tab.

Locking some fields of an entity should solve this.

EntityLock(entity_class, entity_uuid, attributes, reason)

      
    View search.md 
  
  
    File suppressed. Click to show.
  
  
Low level search


Updating the index

When a resource is CRUD'd it must update the Search index:

Search.put(:study, attributes) # create, update
Search.rm(:study, id) # delete

      
    View auth.md 
  
  
    File suppressed. Click to show.
  
  
Task Orientated Authorization

Actor <-> Role <-> Task


Not a CRUD only solution
Tasks can describe anything
Roles and/or Policies
Actors are typically users, but can be any object
Actors are not polluted with authentication concerns
Tasks can be added at runtime


    View gudelines.md 
  
  
    File suppressed. Click to show.
  
  
Guidelines

Be pragmatic, this is a guide.


Value

Engage with Customer / Domain experts

Encourage them to describe their process and root problem.

      
    View data_grid.md 
  
  
    File suppressed. Click to show.
  
  
        DataGrid: build cells, rows and columns

Cells referenced by x,y (like spreadsheet)

Features:


Cells with conditional formatting, e.g. cell is red is value over threshold
Cells with formula, e.g. SUM(A5-A6)


Table has default cell attributes, e.g. height/width

      
    View gist:8949744ef2cc11d50cd0 
  
  
    File suppressed. Click to show.
  
  
            1
            2
            3
            4
            5
            6
            7
            8
            9
          
          
            -input1->
-event4+5-> [Process1] -event1-> [Process2] -event2-> [process4] -event4->
                       -event1-> [Process3] -event3-> [process5] -event5->
 
Each process could be a pool of processes. Each process can use the Actor model.
 
Events need to include a uuid so inputs and results (event4 + event5) can be matched up.
 
Event1 is consumed by two different processes break up different processing of input.

          
    View gist:8c56096946dc02a192a1 
  
  
    File suppressed. Click to show.
  
  
            1
          
          
            ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq/9WdnAcWFW720c/kK2Kyo21SD0z2U0xm11cLKdPofxwKvb97H0m+URLAZhsbJ232R7sfQuUfgGSM6Spg+iv5qyo2nEY3ksyGYn5xMfkS1tIkmP+Q69XoEmNjBh3Pon0X0AITi9QGbRdQ/pYoYpNTcjePPC/1dOqnl/HWNuUyx/DglnFnUoedQAufTLsnTV3eySc9tYFUEjYUGrX+EDcAD+Fg2VmHLhGItRe4lnCy2MSbDFeGI8N7te4ZnwuXp6fHIPSDn74UdDRWAdcrtu99ZEvieMA1ONf3p21w/T2QdiWBUokXv6kmkq8BMucmGXxtl7tZt3QMYoL8D8PxNcM7Q== kris

          
    View events.rb 
  
  
    File suppressed. Click to show.
  
  
            1
            2
            3
            4
            5
            6
            7
            8
            9
          
          
            # initializer
$event_store = EventStore.new
event_store.subscribe(StudyDenormalizer.new, prefix: ‘on’)
 
# controller
 
# push a new event (write database)
uuid = UUID.new
event_store.push(aggregate_id: uuid, event: ‘StudyCreated’, data: { … })

          
    View boundaries.md 
  
  
    File suppressed. Click to show.
  
  
Boundaries


Business goals (Requirements)

The goals of the business


Service (User Interface)

Implements a bounded context
Exposes resources