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Michael Nitschinger on Building a reactive Couc...
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Enterprise Java User Group Austria
September 29, 2015
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Michael Nitschinger on Building a reactive Couchbase driver for the JVM
Enterprise Java User Group Austria
September 29, 2015
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Transcript
A Retrospective: Couchbase on the JVM or
how we’ve built the first reactive driver and still love it Michael Nitschinger, SDK Engineer
©2015 Couchbase Inc. 2 Some History
©2015 Couchbase Inc. 3 Memcached
©2015 Couchbase Inc. 4 Memcached
©2015 Couchbase Inc. 5 Membase + CouchOne =
©2015 Couchbase Inc. 6 = Couchbase
©2015 Couchbase Inc. 7 Java SDK 1.x
§ Extends Spymemcached § Adds Config & View Capabilities § Stable & Mature § Old codebase, difficult to maintain and evolve § API grew organically
©2015 Couchbase Inc. 8 Spymemcached § Initial
Work Started mid 2006 (Java 5) § No Generics § Memcached ASCII Protocol
©2015 Couchbase Inc. 9 API Inconsistencies
©2015 Couchbase Inc. 10 Reworking the API
©2015 Couchbase Inc. 11 From Key Value to
Documents Key Value Views N1QL Search mcd ✔ 1.8 ✔ 2.0 ✔ ✔ 3.0 ✔ ✔ 4.0 ✔ ✔ ✔ .next ✔ ✔ ✔ ✔
©2015 Couchbase Inc. 12 Reworking the API –
The Document
©2015 Couchbase Inc. 13 Reworking the API –
2.x
©2015 Couchbase Inc. 14 Reworking the API
©2015 Couchbase Inc. 15 Rx Semantics single
multiple sync T Iterable<T> async Future<T> Observable<T>
©2015 Couchbase Inc. 16 Rx Semantics Event
Iterable<T> Observable<T> data retrieval T next() onNext(T) discover error throws Exception onError(Throwable) complete returns onCompleted()
©2015 Couchbase Inc. 17 Consuming Observables 17
§ The Observer subscribes and receives events. § A cold Observable starts when subscribed. § onNext can be called 0..N times
©2015 Couchbase Inc. 18 RxJava: Creating Observables
just 18
©2015 Couchbase Inc. 19 RxJava: Creating Observables
19
©2015 Couchbase Inc. 20 RxJava: Creating Observables
20
©2015 Couchbase Inc. 21 RxJava: Creating Observables
21
©2015 Couchbase Inc. 22 RxJava: Creating Observables
22
©2015 Couchbase Inc. 23 RxJava: Creating Observables
23
©2015 Couchbase Inc. 24 RxJava: Transforming Observables
24
©2015 Couchbase Inc. 25 RxJava: Transforming Observables
25
©2015 Couchbase Inc. 26 RxJava: Transforming Observables
26
©2015 Couchbase Inc. 27 RxJava: Transforming Observables
27
©2015 Couchbase Inc. 28 RxJava: Transforming Observables
28
©2015 Couchbase Inc. 29 RxJava: Transforming Observables
29
©2015 Couchbase Inc. 30 RxJava: Transforming Observables
30
©2015 Couchbase Inc. 31 RxJava: Transforming Observables
31
©2015 Couchbase Inc. 32 RxJava: Transforming Observables
32
©2015 Couchbase Inc. 33 RxJava: Filtering Observables
33
©2015 Couchbase Inc. 34 RxJava: Filtering Observables
34
©2015 Couchbase Inc. 35 RxJava: Filtering Observables
35
©2015 Couchbase Inc. 36 RxJava: Filtering Observables
36
©2015 Couchbase Inc. 37 Simple Query 37
©2015 Couchbase Inc. 38 Parameterized Query 38
§ Named Params
©2015 Couchbase Inc. 39 Parametrized Query 39
§ Positional Params
©2015 Couchbase Inc. 40 Conditional Index Creation
40
©2015 Couchbase Inc. 41 Coordinated Fallback 41
©2015 Couchbase Inc. 42 Coordinated Retry: Builder
42 § Declarative API instead of complicated retryWhen
©2015 Couchbase Inc. 43 Levelling up the Architecture
©2015 Couchbase Inc. 44 Why Reactive? 44
©2015 Couchbase Inc. 45 Java != JVM
©2015 Couchbase Inc. 46 Architecture
©2015 Couchbase Inc. 47 Smart Batching
©2015 Couchbase Inc. 48 Backpressure
©2015 Couchbase Inc. 49 Netty
©2015 Couchbase Inc. 50 Netty – In the
next Session!