crowdstf/doc/topo-v1.ditaa

   /------------\  /------------\  /------------\
   |  websocket |  |  websocket |  |  websocket |
   |------------|  |------------|  |------------|  x N
   | PUSH | SUB |  | PUSH | SUB |  | PUSH | SUB |          /------------\
   \------------/  \------------/  \------------/          |   notify   |
      |     ^        |     ^        |     ^                |------------|
      |     |        |     |        |     |                |     SUB    |
      +-------------++--------------+     |                \------------/
            |       |      |              |                       ^
            +-------|------+--------------+                       |
                    |      | +------------------------------------+
                    v      | |
                /--------------\
                |  PULL | PUB  |----------------------------------+
                |--------------|                                  |
----------------|   triproxy   |-----------------  x N            |
                |--------------|                                  |
                |    DEALER    |                                  |
                \--------------/                                  |
                        ^                                         |
                        |                                         |
       +----------------+----------------+                        |
       |                |                |                        |
       v                v                v                        v
/-------------\  /-------------\  /-------------\           /------------\
|    DEALER   |  |    DEALER   |  |    DEALER   |           |    SUB     |
|-------------|  |-------------|  |-------------|           |------------|
|  processor  |  |  processor  |  |  processor  |  x N      |   reaper   |
|-------------|  |-------------|  |-------------|           |------------|
|    DEALER   |  |    DEALER   |  |    DEALER   |           |    PUSH    |
\-------------/  \-------------/  \-------------/           \------------/
       ^                ^                ^                        |
       |                |                |                        |
       +----------------+----------------+                        |
                        |                                         |
                        v                                         |
                 /--------------\                                 |
                 |    DEALER    |                                 |
                 |--------------|                                 |
-----------------|   triproxy   |----------------  x N            |
                 |--------------|                                 |
 +-------------->|  PULL | PUB  |                                 |
 |               \--------------/                                 |
 |                   ^ ^    | |                                   |
 |                   | |    | +----------------------------+      |
 |                   | |    |                              |      |
 |                   | +----|-------------------------------------+
 |           +-------|------+----------------+             |
 |           |       |      |                |             |
 |     +-------------+-+---------------+     |             |
 |     |     |         |    |          |     |             |
 |     |     v         |    v          |     v             |
 | /------------\  /------------\  /------------\          |
 | | PUSH | SUB |  | PUSH | SUB |  | PUSH | SUB |          |
 | |------------|  |------------|  |------------|  x N     |
 | |     dev    |  |     dev    |  |     dev    |          |
 | \------------/  \------------/  \------------/          |
 |        ^               ^               ^                |
 |        :               :               :                |
 |        +---------------+---------------+                |
 |                        :                                |
 |                        v                                |
 |                 /------------\                          |
 +-----------------| PUSH | SUB |<-------------------------+
                   |------------|
                   |  provider  |
                   \------------/