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--- camera_design [2020/08/30 16:58]
127.0.0.1 external edit
+++ camera_design [2020/08/31 03:24] (current)
paul [Observer Pattern]
@@ Line 1: / Line 1: @@
 ====== Camera Design ======
+===== Android Binder =====
+Android uses an IPC framework called Binder that allows for inter process communication. Everyone in Android is connected together in Binder.
+===== Intents =====
+Android allows for processes to communicate with each other using Intents. You can send intents to other processes and then handle their callbacks.
+{{:pasted:20200830-211833.png?500}}
+==== Binder Structure ====
+{{:pasted:20200830-213136.png?500}}
+Binder allows us to communicate to other process through a managed way. It's pretty much roscore in ROS.
+Theres a bunch of different stuff that will happen to get messages from senders to receivers. No need to worry about it but here is how it looks.
+{{:pasted:20200830-224627.png?500}}
+Here is an interesting example of how this plays out when an app requests a location service.
+{{:pasted:20200830-224905.png?500}}
 ===== OOP =====
@@ Line 57: / Line 81: @@
 </code>
+===== OOP Patterns =====
+The following are different design patterns that can be implemented.
+==== Strategy Pattern ====
+I've used this pattern a lot. It's when you define a set of functionality and encapsulate them and then make it interchangeable.
+{{:pasted:20200830-201230.png?500}}
+Here is some implemented C++ code. To see some code, check out ex4 of oop1 in
+learn. Use the strategy pattern when you need to use one of several behaviors
+dynamically.
+==== Observer Pattern ====
+This very similar to the publisher subscriber model. An Observer
+{{:pasted:20200830-233332.png?500}}
 ===== Video Compression ====