Notes taken by Luizo ( @LuigiBrosNin on Telegram)
Notes
Won’t be frequenting this course sadly :,)
1. Distributed systems and SOAs
Distributed system → a network of endpoints that communicate by exchanging messages Examples: your OS, a browser with a Tab manager
Programming distributed systems tasks:
- handling communications → ability to exchange messages
- handling heterogeneity → base standards to make sure different endpoints can communicate (eg. C# on Win / C++ on Linux), aka speak a common tongue
- handling faults → Make sure to avoid crashes when errors occur, since it’s expected (eg. an endpoint can go down)
- handling the evolution of systems → update without “turning off” an endpoint
Always remember to close channels and catch exceptions, error handling
Faults can affect multiple endpoints (eg. in a client/store transaction, many things can go wrong from any client/bank/store endpoint)
Things can be made easier by hiding low level details, abstracting. It can be done with libraries, tools, frameworks or by making new programming languages
Service-oriented Computing (SOC) → A design paradigm for distributed systems. A service-oriented system is a network of services. Services communicate through message passing.
Service-Oriented Architecture (SOA) → architecture based of the Service-oriented computing paradigm.
Services in SOA offer operations, as Objects offer methods
