Preserve an argument after a series of concat operators RxJava

Question

Is it possible to access the first argument of the operators down the line? I'm trying to preserve the value using the zip operator but I haven't managed to do it. Thanks for the help

.concatMap(this::getDeviceStatus)
                .concatMap(this::getCertificateResponse)
                .concatMap(deviceCertificateResponse ->
                        CertificateGenerator.generateCert(deviceCertificateResponse))
                .concatMap(aBoolean -> CrlGenerator.observableCrlGenerator(aBoolean,getCertificateResponse ))  // <- I want to use the first argument again in the last concat map

score 1 · Accepted Answer · answered May 24 '17 at 00:51

1

You could preserve your upstream argument via nesting:

Observable.just("initialValue")
    .concatMap(initialValue -> {
        someMethod(initialValue)
            .concatMap(transformedValue -> anotherMethod(initialValue, transformedValue))
    });

Also, when using Observables and flatMaps, nesting could be replaced with flatMap overload with result selector.

answered May 24 '17 at 00:51

Maksim Ostrovidov

10,720
8
42
57

Thanks, plain and simple – george_mx May 24 '17 at 14:22

Preserve an argument after a series of concat operators RxJava

1 Answers1