RxJava at Freeletics

How we use RxJava at Freeletics and why we like it

Transcript

1. RXJAVA AT FREELETICS Dmytro Khmelenko Software Engineer 3 November 2016
2. REACTIVE EXTENSION It’s a library for composing asynchronous and event- based programs by using observable sequences. 2
3. GET FUNCTIONAL - avoid changing state - avoid mutable data - declarative expression instead of statement - computation as the evaluation of math function 3
4. BEFORE 4 private Product getProduct() throws IOException, JSONException {
 AssetSource assets = new AssetSource(context, "product_1_month.json");
 String productJson = assets.asCharSource(Charsets.UTF_8).read();
 return new Product(productJson);
 }
 
 private void handleProduct() {
 Product product = null;
 try {
 product = getProduct();
 } catch (IOException | JSONException e) {
 e.printStackTrace();
 }
 
 if(product != null) {
 String interval = product.interval();
 //...
 }
 }
5. TRANSFORMATION 5
6. TRANSFORMATION 6
7. AFTER 7
8. GET FUNCTIONAL 8
9. TESTING 9
10. TESTING 10
11. TESTING 11
12. • Documentation • github.com/ReactiveX/RxJava/wiki • reactivex.io • Book • introtorx.com 12 RESOURCES
13. QUESTIONS?