Replaying merged streams individually

Replaying merged streams individually

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Replaying merged streams individually
Tag : development , By : Dave M
Date : November 26 2020, 03:01 PM

Any of those help I solved this, for my particular case. I'm going to add a little bit of extra info, for you to see if it applies to your situation.
In my case all the streams I want to replay return objects of a different type, sealed by an abstract class. So my solution to this problem was to implement my own ObservableTransoformer, named ReplayLastByClassType, which cashes the last elements received by type in a map. You apply it simply by calling .compose(ReplayLastByClassType.instance(), or just ReplayLastByClassType.instance().
public final class ReplayLastByClassType<T> implements ObservableTransformer<T, T> {

    private static final ReplayLastByClassType<Object> INSTANCE = new ReplayLastByClassType<>();

    /** The singleton instance of this transformer **/
    public static <T> ReplayLastByClassType<T> instance() {
        return (ReplayLastByClassType<T>) INSTANCE;

    private ReplayLastByClassType() {

    public Observable<T> apply(Observable<T> upstream) {
        LastSeen<T> lastSeen = new LastSeen<>();
        return new LastSeenObservable<>(upstream.doOnNext(lastSeen).publish().autoConnect(), lastSeen);

    static final class LastSeen<T> implements Consumer<T> {
        ConcurrentHashMap<Class, T> values = new ConcurrentHashMap<>();

        @Override public void accept(T latest) {
            values.put(latest.getClass(), latest);

    static final class LastSeenObservable<T> extends Observable<T> {
        private final Observable<T> upstream;
        private final LastSeen<T> lastSeen;

        LastSeenObservable(Observable<T> upstream, LastSeen<T> lastSeen) {
            this.upstream = upstream;
            this.lastSeen = lastSeen;

        protected void subscribeActual(Observer<? super T> observer) {
            upstream.subscribe(new LastSeenObserver<T>(observer, lastSeen));

    static final class LastSeenObserver<T> implements Observer<T> {
        private final Observer<? super T> downstream;
        private final LastSeen<T> lastSeen;

        LastSeenObserver(Observer<? super T> downstream, LastSeen<T> lastSeen) {
            this.downstream = downstream;
            this.lastSeen = lastSeen;

        @Override public void onSubscribe(Disposable d) {

            Map<Class, T> values = lastSeen.values;
            for (T t: values.values()) {

        @Override public void onNext(T value) {

        @Override public void onComplete() {

        @Override public void onError(Throwable e) {

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Is there a way to track pre-merged and post-merged code review for a branch in Atlassian Crucible

Tag : git , By : user171555
Date : March 29 2020, 07:55 AM
Hope that helps Can you explain this in more detail please? When you refer to Crucible reports do you mean review coverage report, http://FISHEYE_URL/plugins/servlet/review-coverage/REPO_NAME? What commits are marked as unreviewed, just the merge commits, or the actual commits made on the feature branch? In the former case this is the issue: https://jira.atlassian.com/browse/CRUC-6701 you may want to vote on and watch to get notified when that's resolved. In the latter case, does it happen because someone perhaps rebased commits from the feature branch when merging them into the development branch? Crucible at the moment won't detect follow up rebased commits I'm afraid. Instead those would be processed as unreviewed brand new commits.
Hope that helps, let me know if you have further questions. Kind regards,

Split Rx Observable into multiple streams and process individually

Tag : development , By : baumichel
Date : March 29 2020, 07:55 AM
Does that help You don't have to collapse Observables from groupBy. You can instead subscribe to them.
Something like this:
    String[] inputs= {"a", "b", "c", "a", "b", "b", "b", "a"};

    Action1<String> a = s -> System.out.print("-a-");

    Action1<String> b = s -> System.out.print("-b-");

    Action1<String> c = s -> System.out.print("-c-");

            .groupBy(s -> s)
            .subscribe((g) -> {
                if ("a".equals(g.getKey())) {

                if ("b".equals(g.getKey())) {

                if ("c".equals(g.getKey())) {

Remove duplicates from merged streams

Tag : typescript , By : firebasket
Date : March 29 2020, 07:55 AM
To fix this issue I have two observables: , Assumming that your streams emit arrays:
import {combineLatest} from 'rxjs/observable/combineLatest';

this.events = combineLatest(hours$, availableHours$, (hours, availableHours) =>{
  return hours.reduce((acc,actual)=>{
    if(!acc.some(hour => hour.id === actual.id)){
       acc = [...acc,actual];
    return acc;

Powershell Script outputs are merged instead of separated individually

Tag : powershell , By : Kenny
Date : March 29 2020, 07:55 AM
hop of those help? There's better ways of doing this overall, but the simplest way to add this is:

    $Programs = Read-Host "Would you like to see what programs $User has installed? Enter Y or N"

        If ($Programs -eq "Y") {
                Write-Host ""
                Write-Host "Retrieving list of installed programs..."
                Write-Host ""

        $Installed = Get-WmiObject -ComputerName $PCNAME -Class Win32_Product | sort-object Name | select Name
        $Installed | Out-Host

        ElseIf ($Programs -ne "Y" -and $Programs -eq "N") {
                Write-Host ""
                Write-Host "Will not retrieve list of installed programs."

gulp-order node module with merged streams

Tag : node.js , By : jaime
Date : March 29 2020, 07:55 AM
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