Unlocking The Power of Kotlin Channels

The documentation to support my video about Kotlin Channels and flows that you can find here: https://www.youtube.com/watch?v=oEffjtSVAcc. In this video and with this supporting document I am telling a story of how we can use flows and channels. To explain flows I use the examples of coffee in water and boats on the water. A pretty different example that I thought at the time would help people understand Flows and Channels in Kotlin.

Transcript

1. Escape the Ordinary: Unlocking the Power of Kotlin Channels through Coffee, Boats,and Water Streams! A Lightning Presentation (support slides 2023) By João Esperancinha (2024/03/15)
2. Who am I? Software Engineer for 10+ years, mostly in Java and half a decade in Kotlin. Studied at ISEL Lisboa in Computer Science and Telecom Engineering, Spring Professional 2020, OCP11 and Kong Champion
3. Flows and Channels • Flows • Channels Are used asynchronously in suspend functions to produce and consume values in an iterative way to and from a channel. It is defined as a primitive with non-blocking properties that provides an implementation of a SendChannel, to send(produce) data and an implementation of a ReceiveChannel, to receive(consume) data. • Hot Flow • Cold Flow A set of chained operations designed to be called once and quickly return A stream that continuously emit data, regardless of whether the of any consumer being subscribed to it.
4. https://kotlinlang.org/docs/coroutines-overview.html
5. https://www.tibco.com/reference-center/what-is-data-streaming
6. https://kotlinlang.org/docs/channels.html#channels-are-fair
7. https://dictionary.cambridge.org/dictionary/english/canal https://dictionary.cambridge.org/dictionary/english/channel
8. Left side of the stream
9. Right Side of the Stream
10. The full picture
11. Resources • About Coroutines ◦ https://kotlinlang.org/docs/coroutines-overview.html ◦ https://kotlinlang.org/docs/multiplatform-mobile-concurrency-and-coroutines.html ◦ https://www.tibco.com/reference-center/what-is-data-streaming ◦ https://dictionary.cambridge.org/dictionary/english/canal ◦ https://dictionary.cambridge.org/dictionary/english/channel ◦ https://kotlinlang.org/docs/channels.html#buffered-channels • About Hogweed: ◦ - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5729142/ ◦ - https://www.invasivespeciescentre.ca/invasive-species/meet-the-species/invasive-plants/giant-hogweed/
12. Codebase • Source Repository ◦ https://github.com/jesperancinha/asnsei-the-right-waf • Location Directory: ◦ https://github.com/jesperancinha/asnsei-the-right-waf/tree/main/demo-projects/library-channels Use git clone from the command prompt to download the full code base: > git clone https://github.com/jesperancinha/asnsei-the-right-waf.git You’ll be prompted for a username and password which should be your github account. > cd /demo-projects/library-channels The easy way: > make b > make run The manual way: > gradle build > ./gradlew bootRun
13. About me • Homepage - https://joaofilipesabinoesperancinha.nl • LinkedIn - https://www.linkedin.com/in/joaoesperancinha/ • YouTube - JESPROTECH ▪ https://www.youtube.com/channel/UCzS_JK7QsZ7ZH-zTc5kBX_g ▪ https://www.youtube.com/@jesprotech • Bluesky - https://bsky.app/profile/jesperancinha.bsky.social • Mastodon - https://masto.ai/@jesperancinha • GitHub - https://github.com/jesperancinha • Hackernoon - https://hackernoon.com/u/jesperancinha • DevTO - https://dev.to/jofisaes • Medium - https://medium.com/@jofisaes
14. Questions?
15. Thank You!