Add diagrams

tshemsedinov · tshemsedinov · commit e9e51f72f2e2 · 2019-04-11T14:47:19.000+03:00
diff --git a/JavaScript/README.md b/JavaScript/README.md
@@ -0,0 +1,42 @@
+## Separate Command and Query processing at Application Server
+
+```
++---------------------+    +-------------+    +------------+
+|                     |    |             |    |            |
+|       Client        +--->+  Write API  +--->+            |
+|                     |    |             |    |            |
+|   Command { ... }   |    +-------------+    |            |
+|                     |                       |  Database  |
+|                     |    +-------------+    |            |
+|   Query { ... }     |    |             |    |            |
+|                     +--->+  Read API   +--->+            |
+|                     |    |             |    |            |
++---------------------+    +-------------+    +------------+
+```
+
+* Use patterns: Command, Query Object
+* Separate Read and Write APIs
+* Scale Database: use multiple replicas for read
+* Use Event Sourcing (message bus) for DB sync
+
+
+## Scale Read API
+```
++---------------------+    +-------------+    +------------+
+|                     |    |             |    |            |
+|       Client        +--->+  Write API  +--->+  Database  +---+
+|                     |    |             |    |            |   |
+|   Command { ... }   |    +-------------+    +------------+   |
+|                     |                                        |
+|                     |    +-------------+    +------------+   |
+|   Query { ... }     |    |             |    |            |   |
+|                     +--->+  Read API   +--->+  Read DB   +<--+
+|                     |    |             |    |            |   |
+|                     |    +-------------+    +------------+   |
+|                     |                                        |
+|                     |    +-------------+    +------------+   |
+|                     |    |             |    |            |   |
+|                     +--->+  Read API   +--->+  Read DB   +<--+
+|                     |    |             |    |            |
++---------------------+    +-------------+    +------------+
+```
