Grab Attributes from two Mono Objects and set them as a property to a third object using Reactor Java

user_17745755 0
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I have two Api's that return two different Mono objects

Mono<User> user1 = api.service1(...);
Mono<UserV2> user2 = api.service2(...);

I want to grab a property from these objects say and set them to another object say SuperUser

SuperUser superUser = new SuperUser();

i want to do something like this

superUser.setProp1(user1.getProp1());
superUser.setProp2(user2.getProp1());

Once that is done, i want to send the superUser Object some method.

spring-webflux spring java
3 Answers

Zip the two monos and create the superUser from the tuple

Mono.zip(user1, user2).flatMap(data->{
    // get those values as below
    data.getT1();
    data.getT2();

    // set it to superUser
    return <your_response_object>;
});
user_17291230

This is somewhat cleaner way to do it :)

SuperUser superUser = new SuperUser();

return Mono.zip(user1, user2).flatMap(data -> {
            String prop1 = data.getT1().getProp1();
            String prop2 = data.getT2().getProp1();
            if(prop1 != null)) {
                    superUser.setProp1(prop1);
            }
            if(prop2 != null) {
                superUser.setProp2(prop2);
            }
            return superUser;
        });
user_121553250

Use Mono#zipWith like this:

Mono<SuperUser> superUserMono = user1.zipWith(user2)
    .map(userTuple -> {
       superUser.setProp1(userTuple.getT1().getProp1());
       superUser.setProp2(userTuple.getT2().getProp1());
       
       return superUser;
    })
user_67568580
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