Michael Nitschinger on Building a reactive Couchbase driver for the JVM - Speaker Deck

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A Retrospective: Couchbase on the JVM or how we’ve built the ﬁrst reactive driver and still love it Michael Nitschinger, SDK Engineer

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©2015 Couchbase Inc. 2 Some History

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©2015 Couchbase Inc. 3 Memcached

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©2015 Couchbase Inc. 4 Memcached

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©2015 Couchbase Inc. 5 Membase + CouchOne =

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©2015 Couchbase Inc. 6 = Couchbase

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©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

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©2015 Couchbase Inc. 8 Spymemcached §  Initial Work Started mid 2006 (Java 5) §  No Generics §  Memcached ASCII Protocol

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©2015 Couchbase Inc. 9 API Inconsistencies

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©2015 Couchbase Inc. 10 Reworking the API

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©2015 Couchbase Inc. 11 From Key Value to Documents Key Value Views N1QL Search mcd ✔ 1.8 ✔ 2.0 ✔ ✔ 3.0 ✔ ✔ 4.0 ✔ ✔ ✔ .next ✔ ✔ ✔ ✔

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©2015 Couchbase Inc. 12 Reworking the API – The Document

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©2015 Couchbase Inc. 13 Reworking the API – 2.x

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©2015 Couchbase Inc. 14 Reworking the API

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©2015 Couchbase Inc. 15 Rx Semantics single multiple sync T Iterable async Future Observable

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©2015 Couchbase Inc. 16 Rx Semantics Event Iterable Observable data retrieval T next() onNext(T) discover error throws Exception onError(Throwable) complete returns onCompleted()

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©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

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©2015 Couchbase Inc. 18 RxJava: Creating Observables just 18

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©2015 Couchbase Inc. 19 RxJava: Creating Observables 19

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©2015 Couchbase Inc. 20 RxJava: Creating Observables 20

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©2015 Couchbase Inc. 21 RxJava: Creating Observables 21

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©2015 Couchbase Inc. 22 RxJava: Creating Observables 22

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©2015 Couchbase Inc. 23 RxJava: Creating Observables 23

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©2015 Couchbase Inc. 24 RxJava: Transforming Observables 24

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©2015 Couchbase Inc. 25 RxJava: Transforming Observables 25

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©2015 Couchbase Inc. 26 RxJava: Transforming Observables 26

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©2015 Couchbase Inc. 27 RxJava: Transforming Observables 27

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©2015 Couchbase Inc. 28 RxJava: Transforming Observables 28

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©2015 Couchbase Inc. 29 RxJava: Transforming Observables 29

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©2015 Couchbase Inc. 30 RxJava: Transforming Observables 30

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©2015 Couchbase Inc. 31 RxJava: Transforming Observables 31

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©2015 Couchbase Inc. 32 RxJava: Transforming Observables 32

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©2015 Couchbase Inc. 33 RxJava: Filtering Observables 33

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©2015 Couchbase Inc. 34 RxJava: Filtering Observables 34

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©2015 Couchbase Inc. 35 RxJava: Filtering Observables 35

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©2015 Couchbase Inc. 36 RxJava: Filtering Observables 36

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©2015 Couchbase Inc. 37 Simple Query 37

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©2015 Couchbase Inc. 38 Parameterized Query 38 §  Named Params

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©2015 Couchbase Inc. 39 Parametrized Query 39 §  Positional Params

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©2015 Couchbase Inc. 40 Conditional Index Creation 40

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©2015 Couchbase Inc. 41 Coordinated Fallback 41

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©2015 Couchbase Inc. 42 Coordinated Retry: Builder 42 §  Declarative API instead of complicated retryWhen

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©2015 Couchbase Inc. 43 Levelling up the Architecture

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©2015 Couchbase Inc. 44 Why Reactive? 44

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©2015 Couchbase Inc. 45 Java != JVM

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©2015 Couchbase Inc. 46 Architecture

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©2015 Couchbase Inc. 47 Smart Batching

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©2015 Couchbase Inc. 48 Backpressure

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©2015 Couchbase Inc. 49 Netty

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©2015 Couchbase Inc. 50 Netty – In the next Session!