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why background?




App1             App2
why background?




App1                 App2
why background?




App1                     App2
why background?




Frontend                     Daemo
                               n
why background?


Frontend                     Daemon



Frontend                     Daemon
why background?


Frontend                     Daemon



Frontend     CRASH!          Daemon
why background?


Frontend                     Daemon



Frontend                     Daemon
why background?


Frontend                     Daemon



Frontend     CRASH!          Daemon
why background?


Frontend                     Daemon
               Broker



                             Daemon
Frontend
why background?

Fronten
 Fronten                    Daemon
  Fronten
   d
    Fronten
     d
      Fronten
       d
        Frontend
         d
           d

                   Broker
why background?
                     Daemo
Fronten               Daemo
 Fronten               Daemo
                       n
  Fronten
   d                    Daemo
                         n
    Fronten
     d                    Daemo
                           n
      Fronten
       d                    Daemo
                             n
        Frontend
         d                    Daemon
                               n
           d                     n

                   Broker
why background?
                     Daemo
Fronten               Daemo
 Fronten               Daemo
                       n
  Fronten
   d                    Daemo
                         n
    Fronten
     d                    Daemo
                           n
      Fronten
       d                    Daemo
                             n
        Frontend
         d                    Daemon
                               n
           d                     n

                   Broker

                   CRASH!
why background?

Frontend                     Daemon

Frontend       Broker        Daemon




   Staff                      Staff
why background?

Frontend                     Daemon

Frontend       Broker        Daemon


              CRASH!


   Staff                      Staff
why background?

            Broker           Daemon
Frontend
             Workflow        Daemon
Frontend




 Staff                        Staff
what we have ...


1. various frontends
2. backend daemons
3. JSON messages
what we need


1. a way to describe message
flow
2. a easy flexible way to write and
update it
what is workflow

1. really only a path definition
through backends
2. some sort of condition
management
3. a backend definition
{
 _id":"a7y9908898d5...k08b9351063",
"_rev": "6-688067711",
"name": "billing_info",
"type": "workflow",
"user": "adam",
"path": [ "logger", "billing",
"billing_jrcc_jw"]
 }
where are we it do?

1. staff can call backends as before
2. staff can call workflows via the
workflow queue
3. staff can manage workflows in
Redis
problem asynchronous callbacks

1. staff starts a workflow
2. staff calls some external API
3. the external API somehow notifies
us (file attachment, email, URL
callback, ...) about progress
4. staff needs to continue in the
workflow
how do staff correlate messages

1. the backend daemon for the
callback polls a view in
2. staff can search for any value in
the request they sent
3. staff can search for the very value
this external API uses as correlation
_id

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Scaling and redis