====== Verteilte Systeme - Distributed Systems ======

===== Inhalt der Vorlesung: =====

  *   **Foundation of operating systems**
      * Resource-management
      * Process abstraction and life-cycle
      * Scheduling mechanisms

  *    **Foundation of communication systems**
      * Two-Army-Problem
      * Principal properties of communication channels
      * Network transport protocols


  * **Inter-process communication** 
    * Signals, Shared Memory, Pipes, Sockets
  * Typical issues in distributed systems
    * Error-cases, Synchronisation, Distributed time-base and event mechanisms

  *  **Socket-programming in Python and C**

  * **Communication Architectures**
    * Client/Server, Publish/Subscribe, P2P

  * **Middleware-Architectures**
    * Remote Procedure Calls (RPC) and application protocols: (HTTP, HTML, XML, JSON)
    * Examples of distributed architectures: WWW & MQTT
    * Designing RESTful services with AJAX and JSON


==== Themenstellung des Labors: ====

  * Design of application scenarios for wireless sensor networks
  * Using the Contiki-OS for 8/16/32-bit microcontrollers
  * Analysis of use cases for communication protocols
    * Real-time communication
    * Management of limited resources
    * Energy efficiency
    * Excessive packet drop and delay
    * Secure deployment and operation


==== Literatur: ====

  * A. Tanenbaum, M. van Steen: **Distributed Systems**, Prentice-Hall
  * R. Stevens, S. Rago: **Advanced Programming in the UNIX Environment**, Addison-Wesley


----
===== Links: =====

=== REST ===

  * [[https://softwareengineering.stackexchange.com/questions/120716/difference-between-rest-and-crud|Differences between REST and CRUD]]
  * [[https://stackoverflow.com/tags/rest/info|REST (REpresentational State Transfer)]]
  * https://sookocheff.com/post/api/when-to-use-http-put-and-http-post/
  * [[https://stackoverflow.com/questions/5725430/http-test-server-accepting-get-post-requests|HTTP test server accepting GET/POST requests]]
  * Python Frameworks for [[https://fastapi.tiangolo.com|REST-Server(fastapi)]] and [[https://requests.readthedocs.io/en/master/|Clients(requests)]]
  * https://martinfowler.com/articles/richardsonMaturityModel.html

=== API's ===

  * https://ipapi.co/#api  - **IP Location API**
  * http://open-notify.org/Open-Notify-API/ISS-Location-Now/ - **International Space Station Current Location**
  * https://gist.github.com/rshrc/127ba2c20df74263d71bc5a5595c8969 - **A Tutorial on how to use API's in Python** 

=== JSON ===
  * https://jsonata.org/
     * https://www.youtube.com/watch?v=ZBaK40rtIBM&t=1s

=== Queues ===

  * http://queues.io

=== WebRTC ===

  * https://webrtc.org
  * https://simpl.info/rtcpeerconnection/
  * https://simpl.info
  * http://webaudiodemos.appspot.com