AsyncSynchronizer.java

    public static Subscription action() {
        return Observable.create(new LoadConfig())
                .subscribe(new Action1<Config>() {
                    @Override
                    public void call(Config config) {
                        if (config.nedToUpdate()) {
                            //данных нет обновляемся
                            update();
                        } else {
                            if (config.nedToBeSend()) {
                                send();
                            } else {
                                //ничего не делать
                            }
                        }
                    }
                });
    }

    public static Subscription update() {
        return gainingInformation()
                .doOnNext(new Action1<JsonObject>() {
                    @Override
                    public void call(final JsonObject jsonObject) {
                        send();
                    }
                })
                .subscribe();
    }

    private static Observable<JsonObject> gainingInformation() {
        Observable<Information> information1 = Observable.create(new Information1Loader());
        Observable<Information> information2 = Observable.create(new Information2Loader());
        Observable<Information> information3 = Observable.create(new Information3Loader());
        Observable<Information> information4 = Observable.create(new Information4Loader());

        return Observable.zip(
                Arrays.asList(information1, information2, information3, information4),
                joinInformationToJsonObject());
    }

    private static Subscription send() {
        return sendDataObservable(String.valueOf(jsonObject))
                .subscribeOn(Schedulers.newThread()).onErrorResumeNext(
                        saveFile(jsonObject))
                .doOnNext(new Action1<JsonObject>() {
                    @Override
                    public void call(JsonObject s) {
                        if (s != null) {
                            jsonObject.addProperty(SENT, true);
                        }
                        saveFile(jsonObject).subscribe();
                    }
                }).subscribe();
    }