io.reactivex.internal.operators.flowable.FlowableBufferBoundary Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of rxjava Show documentation
Show all versions of rxjava Show documentation
Reactive Extensions for Java
/**
* 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.internal.operators.flowable;
import java.util.*;
import java.util.concurrent.Callable;
import java.util.concurrent.atomic.*;
import org.reactivestreams.*;
import io.reactivex.*;
import io.reactivex.disposables.*;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.Function;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.queue.SpscLinkedArrayQueue;
import io.reactivex.internal.subscriptions.SubscriptionHelper;
import io.reactivex.internal.util.*;
import io.reactivex.plugins.RxJavaPlugins;
public final class FlowableBufferBoundary, Open, Close>
extends AbstractFlowableWithUpstream {
final Callable bufferSupplier;
final Publisher bufferOpen;
final Function> bufferClose;
public FlowableBufferBoundary(Flowable source, Publisher bufferOpen,
Function> bufferClose, Callable bufferSupplier) {
super(source);
this.bufferOpen = bufferOpen;
this.bufferClose = bufferClose;
this.bufferSupplier = bufferSupplier;
}
@Override
protected void subscribeActual(Subscriber s) {
BufferBoundarySubscriber parent =
new BufferBoundarySubscriber(
s, bufferOpen, bufferClose, bufferSupplier
);
s.onSubscribe(parent);
source.subscribe(parent);
}
static final class BufferBoundarySubscriber, Open, Close>
extends AtomicInteger implements FlowableSubscriber, Subscription {
private static final long serialVersionUID = -8466418554264089604L;
final Subscriber downstream;
final Callable bufferSupplier;
final Publisher bufferOpen;
final Function> bufferClose;
final CompositeDisposable subscribers;
final AtomicLong requested;
final AtomicReference upstream;
final AtomicThrowable errors;
volatile boolean done;
final SpscLinkedArrayQueue queue;
volatile boolean cancelled;
long index;
Map buffers;
long emitted;
BufferBoundarySubscriber(Subscriber actual,
Publisher bufferOpen,
Function> bufferClose,
Callable bufferSupplier
) {
this.downstream = actual;
this.bufferSupplier = bufferSupplier;
this.bufferOpen = bufferOpen;
this.bufferClose = bufferClose;
this.queue = new SpscLinkedArrayQueue(bufferSize());
this.subscribers = new CompositeDisposable();
this.requested = new AtomicLong();
this.upstream = new AtomicReference();
this.buffers = new LinkedHashMap();
this.errors = new AtomicThrowable();
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.setOnce(this.upstream, s)) {
BufferOpenSubscriber open = new BufferOpenSubscriber(this);
subscribers.add(open);
bufferOpen.subscribe(open);
s.request(Long.MAX_VALUE);
}
}
@Override
public void onNext(T t) {
synchronized (this) {
Map bufs = buffers;
if (bufs == null) {
return;
}
for (C b : bufs.values()) {
b.add(t);
}
}
}
@Override
public void onError(Throwable t) {
if (errors.addThrowable(t)) {
subscribers.dispose();
synchronized (this) {
buffers = null;
}
done = true;
drain();
} else {
RxJavaPlugins.onError(t);
}
}
@Override
public void onComplete() {
subscribers.dispose();
synchronized (this) {
Map bufs = buffers;
if (bufs == null) {
return;
}
for (C b : bufs.values()) {
queue.offer(b);
}
buffers = null;
}
done = true;
drain();
}
@Override
public void request(long n) {
BackpressureHelper.add(requested, n);
drain();
}
@Override
public void cancel() {
if (SubscriptionHelper.cancel(upstream)) {
cancelled = true;
subscribers.dispose();
synchronized (this) {
buffers = null;
}
if (getAndIncrement() != 0) {
queue.clear();
}
}
}
void open(Open token) {
Publisher p;
C buf;
try {
buf = ObjectHelper.requireNonNull(bufferSupplier.call(), "The bufferSupplier returned a null Collection");
p = ObjectHelper.requireNonNull(bufferClose.apply(token), "The bufferClose returned a null Publisher");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
SubscriptionHelper.cancel(upstream);
onError(ex);
return;
}
long idx = index;
index = idx + 1;
synchronized (this) {
Map bufs = buffers;
if (bufs == null) {
return;
}
bufs.put(idx, buf);
}
BufferCloseSubscriber bc = new BufferCloseSubscriber(this, idx);
subscribers.add(bc);
p.subscribe(bc);
}
void openComplete(BufferOpenSubscriber os) {
subscribers.delete(os);
if (subscribers.size() == 0) {
SubscriptionHelper.cancel(upstream);
done = true;
drain();
}
}
void close(BufferCloseSubscriber closer, long idx) {
subscribers.delete(closer);
boolean makeDone = false;
if (subscribers.size() == 0) {
makeDone = true;
SubscriptionHelper.cancel(upstream);
}
synchronized (this) {
Map bufs = buffers;
if (bufs == null) {
return;
}
queue.offer(buffers.remove(idx));
}
if (makeDone) {
done = true;
}
drain();
}
void boundaryError(Disposable subscriber, Throwable ex) {
SubscriptionHelper.cancel(upstream);
subscribers.delete(subscriber);
onError(ex);
}
void drain() {
if (getAndIncrement() != 0) {
return;
}
int missed = 1;
long e = emitted;
Subscriber a = downstream;
SpscLinkedArrayQueue q = queue;
for (;;) {
long r = requested.get();
while (e != r) {
if (cancelled) {
q.clear();
return;
}
boolean d = done;
if (d && errors.get() != null) {
q.clear();
Throwable ex = errors.terminate();
a.onError(ex);
return;
}
C v = q.poll();
boolean empty = v == null;
if (d && empty) {
a.onComplete();
return;
}
if (empty) {
break;
}
a.onNext(v);
e++;
}
if (e == r) {
if (cancelled) {
q.clear();
return;
}
if (done) {
if (errors.get() != null) {
q.clear();
Throwable ex = errors.terminate();
a.onError(ex);
return;
} else if (q.isEmpty()) {
a.onComplete();
return;
}
}
}
emitted = e;
missed = addAndGet(-missed);
if (missed == 0) {
break;
}
}
}
static final class BufferOpenSubscriber
extends AtomicReference
implements FlowableSubscriber, Disposable {
private static final long serialVersionUID = -8498650778633225126L;
final BufferBoundarySubscriber parent;
BufferOpenSubscriber(BufferBoundarySubscriber parent) {
this.parent = parent;
}
@Override
public void onSubscribe(Subscription s) {
SubscriptionHelper.setOnce(this, s, Long.MAX_VALUE);
}
@Override
public void onNext(Open t) {
parent.open(t);
}
@Override
public void onError(Throwable t) {
lazySet(SubscriptionHelper.CANCELLED);
parent.boundaryError(this, t);
}
@Override
public void onComplete() {
lazySet(SubscriptionHelper.CANCELLED);
parent.openComplete(this);
}
@Override
public void dispose() {
SubscriptionHelper.cancel(this);
}
@Override
public boolean isDisposed() {
return get() == SubscriptionHelper.CANCELLED;
}
}
}
static final class BufferCloseSubscriber>
extends AtomicReference
implements FlowableSubscriber © 2015 - 2024 Weber Informatics LLC | Privacy Policy