I have this code to wrap a callback in Rx Java 1 and it compiles fine , but now that I have switched to RX Java 2 it does not compile...what is the equivalent in Rx Java 2?
return Observable.fromEmitter(new Action1<AsyncEmitter<Integer>>() {
@Override
public void call(AsyncEmitter<Integer> emitter) {
transObs.setTransferListener(new TransferListener() {
@Override
public void onStateChanged(int id, TransferState state) {
if (state == TransferState.COMPLETED)
emitter.onCompleted();
}
@Override
public void onProgressChanged(int id, long bytesCurrent, long bytesTotal) {
}
@Override
public void onError(int id, Exception ex) {
emitter.onError(ex);
}
});
emitter.setCancellation(new AsyncEmitter.Cancellable() {
@Override
public void cancel() throws Exception {
transObs.cleanTransferListener();
}
});
}
}, AsyncEmitter.BackpressureMode.BUFFER);
UPDATE:
I came up with this, but Do you have to deal with backpressure since its an oncreate call?
return Observable.create(new ObservableOnSubscribe<List<DigitsUser>>() {
@Override
public void subscribe(final ObservableEmitter<List<DigitsUser>> emitter) throws Exception {
mDigitFriends.findFriends((gotEm, users) -> {
emitter.onNext(users);
});
emitter.setCancellable(() -> {
emitter.onNext(null);
});
}
});
If you're worried about backpressure you should use the Flowable class. Here's a quote from the RxJava2 Wiki:
Practically, the 1.x fromEmitter (formerly fromAsync) has been renamed to Flowable.create.
Here is your example using the Flowable class:
return Flowable.create(new FlowableEmitter<List<DigitsUser>>() {
@Override
public void subscribe(final FlowableEmitter<List<DigitsUser>> emitter) throws Exception {
mDigitFriends.findFriends((gotEm, users) -> {
emitter.onNext(users);
});
emitter.setCancellable(() -> {
emitter.onNext(null);
});
}
}, BackpressureStrategy.BUFFER);