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/*
* Copyright (c) 2016-present, RxJava Contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is
* distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
* the License for the specific language governing permissions and limitations under the License.
*/
package io.reactivex.rxjava3.internal.operators.mixed;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicReference;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.Function;
import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
import io.reactivex.rxjava3.internal.util.*;
import io.reactivex.rxjava3.operators.SimpleQueue;
/**
* Maps the upstream items into {@link CompletableSource}s and subscribes to them one after the
* other completes or terminates (in error-delaying mode).
* History: 2.1.11 - experimental
* @param the upstream value type
* @since 2.2
*/
public final class FlowableConcatMapCompletable extends Completable {
final Flowable source;
final Function mapper;
final ErrorMode errorMode;
final int prefetch;
public FlowableConcatMapCompletable(Flowable source,
Function mapper,
ErrorMode errorMode,
int prefetch) {
this.source = source;
this.mapper = mapper;
this.errorMode = errorMode;
this.prefetch = prefetch;
}
@Override
protected void subscribeActual(CompletableObserver observer) {
source.subscribe(new ConcatMapCompletableObserver<>(observer, mapper, errorMode, prefetch));
}
static final class ConcatMapCompletableObserver
extends ConcatMapXMainSubscriber
implements Disposable {
private static final long serialVersionUID = 3610901111000061034L;
final CompletableObserver downstream;
final Function mapper;
final ConcatMapInnerObserver inner;
volatile boolean active;
int consumed;
ConcatMapCompletableObserver(CompletableObserver downstream,
Function mapper,
ErrorMode errorMode, int prefetch) {
super(prefetch, errorMode);
this.downstream = downstream;
this.mapper = mapper;
this.inner = new ConcatMapInnerObserver(this);
}
@Override
void onSubscribeDownstream() {
downstream.onSubscribe(this);
}
@Override
void disposeInner() {
inner.dispose();
}
@Override
public void dispose() {
stop();
}
@Override
public boolean isDisposed() {
return cancelled;
}
void innerError(Throwable ex) {
if (errors.tryAddThrowableOrReport(ex)) {
if (errorMode == ErrorMode.IMMEDIATE) {
upstream.cancel();
errors.tryTerminateConsumer(downstream);
if (getAndIncrement() == 0) {
queue.clear();
}
} else {
active = false;
drain();
}
}
}
void innerComplete() {
active = false;
drain();
}
@Override
void drain() {
if (getAndIncrement() != 0) {
return;
}
ErrorMode errorMode = this.errorMode;
SimpleQueue queue = this.queue;
AtomicThrowable errors = this.errors;
boolean syncFused = this.syncFused;
do {
if (cancelled) {
queue.clear();
return;
}
if (errors.get() != null) {
if (errorMode == ErrorMode.IMMEDIATE
|| (errorMode == ErrorMode.BOUNDARY && !active)) {
queue.clear();
errors.tryTerminateConsumer(downstream);
return;
}
}
if (!active) {
boolean d = done;
T v;
try {
v = queue.poll();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
upstream.cancel();
errors.tryAddThrowableOrReport(ex);
errors.tryTerminateConsumer(downstream);
return;
}
boolean empty = v == null;
if (d && empty) {
errors.tryTerminateConsumer(downstream);
return;
}
if (!empty) {
int limit = prefetch - (prefetch >> 1);
if (!syncFused) {
int c = consumed + 1;
if (c == limit) {
consumed = 0;
upstream.request(limit);
} else {
consumed = c;
}
}
CompletableSource cs;
try {
cs = Objects.requireNonNull(mapper.apply(v), "The mapper returned a null CompletableSource");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
queue.clear();
upstream.cancel();
errors.tryAddThrowableOrReport(ex);
errors.tryTerminateConsumer(downstream);
return;
}
active = true;
cs.subscribe(inner);
}
}
} while (decrementAndGet() != 0);
}
static final class ConcatMapInnerObserver extends AtomicReference
implements CompletableObserver {
private static final long serialVersionUID = 5638352172918776687L;
final ConcatMapCompletableObserver parent;
ConcatMapInnerObserver(ConcatMapCompletableObserver parent) {
this.parent = parent;
}
@Override
public void onSubscribe(Disposable d) {
DisposableHelper.replace(this, d);
}
@Override
public void onError(Throwable e) {
parent.innerError(e);
}
@Override
public void onComplete() {
parent.innerComplete();
}
void dispose() {
DisposableHelper.dispose(this);
}
}
}
}