WHOAMI

• Tom Wilson (@twilson63)
• Lead Technologist for Jack Russell Software, A Tabula Rasa Healthcare Division
• <3 JavaScript/ES
• <3 NodeJS/IO.JS
• <3 CouchDB/PouchDB
• <3 Angular1/Mercury

Terms

• Monolithic Application
• MicroServices

Monolithic Application

An application that is built as a single unit

Monolithic Application

+---------------+           +-----------------+
|               |           |                 |
|               |           |                 |
|  Application  +---------->|   Database      |
|               |           |                 |
|               |           |                 |
|               |           |                 |
+---------------+           +-----------------+

Monolithic Application

+---------------+           +-----------------+
|               |           |                 |
|               |           |                 |
|  Application  +---------->|   Database      |
|               +           |                 |
|               |           |                 |
|               |           |                 |
+------+--------+           +-----------------+
      +
+---------------+           +-----------------+
|               |           |   Services      |
|  Caching      |           |-----------------|
|               +-----------+                 |
|               |           |                 |
|               |           |                 |
+---------------+           +-----------------+

In Process Components

+-------------------------------------------------------------------+
| Application                                                       |
|                   +----------+                +--------------+    |
| +----------+      |          |                |              |    |
| |          |      | Component|                | Component    |    |
| | Component|      |          |                |              |    |
| |          |      |          |                |              |    |
| |          |      +----------+                |              |    |
| +----------+                                  |              |    |
|                                               +--------------+    |
|                                                                   |
|  +-------------+         +-------------+                          |
|  |             |         |             |                          |
|  | Component   |         |             |                          |
|  |             |         | Component   |                          |
|  |             |         |             |                          |
|  |             |         |             |      +--------------+    |
|  +-------------+         |             |      |              |    |
|                          |             |      | Component    |    |
|                          +-------------+      |              |    |
|                                               |              |    |
|                                               |              |    |
|                                               +--------------+    |
|                                                                   |
+-------------------------------------------------------------------+

MicroServices

+------------+        +--------------+
|            |        |              |     +----------------+
| Application|        | Component    |     |                |
|            |        |              |     | Component      |
|            |        |              |     |                |
|            |        |              |     |                |
+------------+        +--------------+     |                |
                                           |                |
    +------------+                         +----------------+
    |            |
    |            |
    |  Component |      +---------------+
    |            |      |               |
    |            |      |  Component    |
    |            |      |               |   +-----------------+
    +------------+      |               |   |                 |
                        |               |   |  Component      |
                        |               |   |                 |
                        +---------------+   |                 |
    +----------------+                      |                 |
    |                |                      |                 |
    |  Component     |                      +-----------------+
    |                |
    |                |
    |                |
    |                |
    +----------------+

MicroServices is about Team Organization too

Conway's Law

Any organization that designs a system (defined broadly) will produce a design whose structure is a copy of the organization's communication structure.

Technical Domains

+---------------+ +---------------+ +----------------+ +----------------+ +---------------+
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
|   Designers   | | Front End     | | Backend Devs   | | DevOps         | | DBA's         |
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
|               | |               | |                | |                | |               |
+---------------+ +---------------+ +----------------+ +----------------+ +---------------+

Business Domains

+----------------+
|                |       +-----------------+
|  Product A     |       |                 |
|                |       |                 |       +-----------------------------------+
|                |       |  Product C      |       | Services                          |
|                |       |                 |       |-----------------------------------|
+----------------+       |                 |       |                                   |
                         |                 |       |  * Service 1                      |
+----------------+       +-----------------+       |  * Service 2                      |
|                |                                 |  * Service 3                      |
|  Product B     |                                 |  * Service 4                      |
|                |                                 |                                   |
|                |   +------------------+          |                                   |
|                |   |                  |          |                                   |
|                |   |                  |          |                                   |
+----------------+   |  Product D       |          |                                   |
                     |                  |          |                                   |
                     |                  |          |                                   |
                     |                  |          |                                   |
                     |                  |          |                                   |
                     +------------------+          |                                   |
                                                   |                                   |
                                                   |                                   |
                                                   |                                   |
                                                   +-----------------------------------+

Addressing the Need for Complexity

http://12factor.net/

• Multiple Presentation Layers
• Cross-Functional Features
• Multiple Persistent Models
• Multi-Site Replication
• Central Logging
• Multiple Languages
• Feature Experiementation

MicroServices Platform

+-----------------------+                     +------------------------+ +-------------------+
| Platform as a Service |                     |  Platform as a Service | | Data Containers   |
|-----------------------|                     |------------------------| |-------------------|
| * App 1               |      xxxxxxxx       |  * Service 1           | | +-------+         |
| * App 2               |    xxx      xxx     |  * Service 2           | | | SQL   |         |
| * App 3               |   xx          xx    |  * Service 3           | | |       |         |
| * App 4               |   x            x    |  * Service 4           | | +-------+         |
|                       |  xx            x    |                        | | +-------+         |
|                       |  xx            x    |                        | | | NoSQL |         |
|                       |   xx          xx    |                        | | |       |         |
|                       |    xxx      xxx     |                        | | +-------+         |
|                       |      xxxxxxxx       |                        | | +-------+         |
|                       |                     |                        | | | Redis |         |
|                       |    Pub/Sub/Log      |                        | | |       |         |
|                       |                     |                        | | +-------+         |
|                       |                     |                        | |                   |
|                       |                     |                        | |                   |
+-----------------------+                     +------------------------+ +-------------------+

Pushes Complexity to Automation

• Components
• Services

Product Based, not Project Based

Smart endpoints and dumb pipes

Decentralized Governance

Decentralized Data Management

Infrastructure Automation

Design for failure

Evolutionary Design

Resources

http://martinfowler.com/articles/microservices.html https://github.com/twilson63/palmettoflow