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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