Perform non-transformative action on each item in observable before onNext

Perform non-transformative action on each item in observable before onNext

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Perform non-transformative action on each item in observable before onNext
Tag : android , By : Saurabh
Date : November 27 2020, 12:01 PM

hope this fix your issue You want doOnNext. (You were very close with "doOnEach")
doOnNext is for side-effects within the stream and does not consume the item.

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Use Observable.FromEventPattern to perform action after inactivity or count

Tag : chash , By : Magnus
Date : March 29 2020, 07:55 AM
I hope this helps . Use Buffer with a custom bufferClosingSelector. The idea here is that every buffer should be closed either after maxDuration or after maxCount items, whichever comes sooner. Each time a buffer closes, a new one is opened.
var maxDuration = TimeSpan.FromSeconds(10);
var maxCount = 100;
var throttledStream = keyspaceStream.Publish(o =>
    var reachedMaxDuration = o
        .Select(_ => Observable.Timer(maxDuration, scheduler))
    return o.Buffer(() => o

Is it safe to initialize RecyclerView item in onNext of Observable

Tag : android , By : user113409
Date : March 29 2020, 07:55 AM
this will help Preparing data during scroll is quite bad idea in general (CursorAdapter is another story). I suppose in your case everything works ok because of your code
    formatedDate = DateFormat.format("H:m", date).toString();
} else {
    formatedDate = DateFormat.format("d MMM yyyy", date).toString();
public class Model{
    String formatedDate;
    //other fields
Observable<List<Model>> getModels(long fromDate, long toDate);

Perform action AFTER subscribing to observable

Tag : android , By : TC.
Date : March 29 2020, 07:55 AM
This might help you I want to perform an action, which is executed after subscribing to an Observable. Currently I perform some BLE related operations like reading the rssi of my connection: , From doOnSubscribe documentation:
public Observable<RssiState> readRssi() {
    return Observable.create(emitter -> {
             // this is invoked for every new subscriber
             BluetoothGattCallback callback = 
                 (BluetoothGatt gatt, int rssi, int status) -> {
                     emitter.onNext(new RssiState(gatt, rssi, status));
             gatt.addListener(callback); // not sure about method name
             gatt.readRemoteRssi(); // initiate read

Perform an action on Observable zip subscription

Tag : angular , By : obijywk
Date : March 29 2020, 07:55 AM
Hope this helps You have to return the Observable data from those http requests instead of subscribing there
http1() {
    return this.http.post<any>('/url1').pipe(tap(val => console.log(1)));

http2() {
    return this.http.post<any>('/url2').pipe(tap(val => console.log(1)));
zip(http1(), http2()).subscribe(() => console.log(3));

How to pass the item indexes in Observable.fromIterable to onNext in subscribe method?

Tag : java , By : Jet Thompson
Date : March 29 2020, 07:55 AM
it should still fix some issue If you are processing the URLs sequentially, you can just introduce an index field in the Observer:
    .concatMapSingle(url -> getChannels(url))
    .subscribe(new Observer<ResponseBody>() {

         int index;  // <----------------------------------------------------

         // ...

         public void onNext(ResponseBody responseBody) {
             Group group = GroupParser.parseList(responseBody.byteStream(), index);

             groups.put(index, group);

             index++;  // <---------------------------------------------------------

         // ...
 Observable.defer(() -> {
     AtomicInteger counter = new AtomicInteger();
     return Observable.fromIterable(mUrls.getGroups())
     .map(url -> Pair.of(url, counter.getAndIncremenet()));
 .flatMapSingle(urlIndex -> 
     .map(v -> Pair.of(v, urlIndex.second))
 .subscribe(new Observer<Pair<ResponseBody, Integer>>() {

         // ...

         public void onNext(Pair<ResponseBody, Integer> pair) {
             Group group = GroupParser.parseList(pair.first.byteStream(), pair.second);

             groups.put(pair.second, group);

         // ...
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