Reactor – How to convert Flux into List, Map

In this tutorial, JavaSampleApproach introduce ways to convert Reactor Flux into List/Map.

I. Ways to convert Flux into Collection

We will use Flux methods such as:
collectList(): accumulate sequence into a Mono<List>.
collectSortedList(): accumulate sequence and sort into a Mono<List>.
collectMap(): convert sequence into a Mono<Map>.
collectMultimap(): convert sequence into a Mono<Map> that each Map’s key can be paired with multi-value (in a Collection).

Then the Mono result above will be converted into a real List/Map using block() method.

0. Initialization
0.1 Reactor installation in Maven

– First, import the BOM by adding the following to pom.xml:

– Next, add dependency:

0.2 Declare & Initialize Flux

1. List
1.1 Flux.collectList

1.2 Flux.collectSortedList

2. Map
2.1 Flux.collectMap

2.2 Flux.collectMultimap

II. Source Code

1. Technology

– Java 8
– Maven 3.6.1
– Reactor Core 3.0.4, with the Aluminium release train.

2. Code

3. Results


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