topics.todo

Building Reactive Applications:
Venkat Subramaniam
venkats@agiledeveloper.com
Twitter: @venkat s

Access:
URL: https://github.com/venkats/jconf2019ws
                    
Part 0: Reactive Programming:
✓What's that?
✓Why do we need yet another programming model?
✓Where did it come from?
✓Core concerns
 ✓Scalability — Elastic
 ✓Responsiveness
 ✓Resilience
 ✓Communication — Message Driven
✓Reactive Applications
✓A way to build a scalable architecture that's
	resilient and quick to react to stimuli
✓It's about creating an architecture for an application that is
 ✓Message-Driven
 ✓Elastic
 ✓Responsive
 ✓Resilient

Part 1: Where did we come from:
✓These concerns are not new
✓Isn't multithreading enough?
✓Are Futures not enough?
 ✓ Low level of abstraction
 ✓ Hard to compose
 ✓ Easy to block on gets - poor utilization
✓Ah, but we can use callbacks, no?
 ✓ better, but hard to compose as well
✓OK, so what is it really?
✓Dataflow and composition of events
✓Let's think Streams
✓What are streams?
✓Exercise: Let's simulate an application

Part 2: Core Ideas:
✓Efficiency, Scale
✓Efficiency is attained not by doing tasks faster,
	but by avoiding those that should't be done in the first place
✓How to do that?
✓Reactive is a next logical step from functional programming
✓Employ function composition and lazy evaluations

Part 3: Observable:
✓The observer pattern
✓Iterator vs. observers
✓Observable vs. the pattern
✓Observer plus
	✓signal end of data stream
	✓channel to propagate error
	✓hot, cold, synchronous, asynchronous
	✓highly compose-able
✓Let's use observable
 ✓Creating an observable
 ✓Creating a subscriber
 ✓Using Action to implement
 ✓Using Lambda
✓Creating custom observable
✓Exercise: Stock fetch 

Part 4: Controlling Interaction:
✓Signaling data termination
✓Unsubscribing
✓Exercise: Interacting with a Drone
✓skip
✓SkipWhile
✓take
✓takeWhile
✓Exercise: Selectively Interacting with a Drone 

Part 5: Handling Failures:
✓What if things go wrong?
✓Resilience
✓Dealing with errors
✓Switching services on failure
✓Exercise: Handling Failures

Part 6: Subscriptions:
✓hot vs. cold observables
✓Exercise: Hot or Cold?

Part 7: Slow Subscribers:
✓synchronous
✓asynchronous
✓Speed of notification
✓Sampling
✓Implementing Producer for backpressure handling
✓Exercise: Manage Threads

Summary: