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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.rxjava3.internal.operators.flowable;
import java.util.*;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import org.reactivestreams.*;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.core.Scheduler.Worker;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.Supplier;
import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
import io.reactivex.rxjava3.internal.queue.MpscLinkedQueue;
import io.reactivex.rxjava3.internal.subscribers.QueueDrainSubscriber;
import io.reactivex.rxjava3.internal.subscriptions.*;
import io.reactivex.rxjava3.internal.util.QueueDrainHelper;
import io.reactivex.rxjava3.subscribers.SerializedSubscriber;
public final class FlowableBufferTimed> extends AbstractFlowableWithUpstream {
final long timespan;
final long timeskip;
final TimeUnit unit;
final Scheduler scheduler;
final Supplier bufferSupplier;
final int maxSize;
final boolean restartTimerOnMaxSize;
public FlowableBufferTimed(Flowable source, long timespan, long timeskip, TimeUnit unit, Scheduler scheduler, Supplier bufferSupplier, int maxSize,
boolean restartTimerOnMaxSize) {
super(source);
this.timespan = timespan;
this.timeskip = timeskip;
this.unit = unit;
this.scheduler = scheduler;
this.bufferSupplier = bufferSupplier;
this.maxSize = maxSize;
this.restartTimerOnMaxSize = restartTimerOnMaxSize;
}
@Override
protected void subscribeActual(Subscriber s) {
if (timespan == timeskip && maxSize == Integer.MAX_VALUE) {
source.subscribe(new BufferExactUnboundedSubscriber<>(
new SerializedSubscriber<>(s),
bufferSupplier, timespan, unit, scheduler));
return;
}
Scheduler.Worker w = scheduler.createWorker();
if (timespan == timeskip) {
source.subscribe(new BufferExactBoundedSubscriber<>(
new SerializedSubscriber<>(s),
bufferSupplier,
timespan, unit, maxSize, restartTimerOnMaxSize, w
));
return;
}
// Can't use maxSize because what to do if a buffer is full but its
// timespan hasn't been elapsed?
source.subscribe(new BufferSkipBoundedSubscriber<>(
new SerializedSubscriber<>(s),
bufferSupplier, timespan, timeskip, unit, w));
}
static final class BufferExactUnboundedSubscriber>
extends QueueDrainSubscriber implements Subscription, Runnable, Disposable {
final Supplier bufferSupplier;
final long timespan;
final TimeUnit unit;
final Scheduler scheduler;
Subscription upstream;
U buffer;
final AtomicReference timer = new AtomicReference<>();
BufferExactUnboundedSubscriber(
Subscriber actual, Supplier bufferSupplier,
long timespan, TimeUnit unit, Scheduler scheduler) {
super(actual, new MpscLinkedQueue<>());
this.bufferSupplier = bufferSupplier;
this.timespan = timespan;
this.unit = unit;
this.scheduler = scheduler;
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.upstream, s)) {
this.upstream = s;
U b;
try {
b = Objects.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
cancel();
EmptySubscription.error(e, downstream);
return;
}
buffer = b;
downstream.onSubscribe(this);
if (!cancelled) {
s.request(Long.MAX_VALUE);
Disposable d = scheduler.schedulePeriodicallyDirect(this, timespan, timespan, unit);
if (!timer.compareAndSet(null, d)) {
d.dispose();
}
}
}
}
@Override
public void onNext(T t) {
synchronized (this) {
U b = buffer;
if (b != null) {
b.add(t);
}
}
}
@Override
public void onError(Throwable t) {
DisposableHelper.dispose(timer);
synchronized (this) {
buffer = null;
}
downstream.onError(t);
}
@Override
public void onComplete() {
DisposableHelper.dispose(timer);
U b;
synchronized (this) {
b = buffer;
if (b == null) {
return;
}
buffer = null;
}
queue.offer(b);
done = true;
if (enter()) {
QueueDrainHelper.drainMaxLoop(queue, downstream, false, null, this);
}
}
@Override
public void request(long n) {
requested(n);
}
@Override
public void cancel() {
cancelled = true;
upstream.cancel();
DisposableHelper.dispose(timer);
}
@Override
public void run() {
U next;
try {
next = Objects.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
cancel();
downstream.onError(e);
return;
}
U current;
synchronized (this) {
current = buffer;
if (current == null) {
return;
}
buffer = next;
}
fastPathEmitMax(current, false, this);
}
@Override
public boolean accept(Subscriber a, U v) {
downstream.onNext(v);
return true;
}
@Override
public void dispose() {
cancel();
}
@Override
public boolean isDisposed() {
return timer.get() == DisposableHelper.DISPOSED;
}
}
static final class BufferSkipBoundedSubscriber>
extends QueueDrainSubscriber implements Subscription, Runnable {
final Supplier bufferSupplier;
final long timespan;
final long timeskip;
final TimeUnit unit;
final Worker w;
final List buffers;
Subscription upstream;
BufferSkipBoundedSubscriber(Subscriber actual,
Supplier bufferSupplier, long timespan,
long timeskip, TimeUnit unit, Worker w) {
super(actual, new MpscLinkedQueue<>());
this.bufferSupplier = bufferSupplier;
this.timespan = timespan;
this.timeskip = timeskip;
this.unit = unit;
this.w = w;
this.buffers = new LinkedList<>();
}
@Override
public void onSubscribe(Subscription s) {
if (!SubscriptionHelper.validate(this.upstream, s)) {
return;
}
this.upstream = s;
final U b; // NOPMD
try {
b = Objects.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
w.dispose();
s.cancel();
EmptySubscription.error(e, downstream);
return;
}
buffers.add(b);
downstream.onSubscribe(this);
s.request(Long.MAX_VALUE);
w.schedulePeriodically(this, timeskip, timeskip, unit);
w.schedule(new RemoveFromBuffer(b), timespan, unit);
}
@Override
public void onNext(T t) {
synchronized (this) {
for (U b : buffers) {
b.add(t);
}
}
}
@Override
public void onError(Throwable t) {
done = true;
w.dispose();
clear();
downstream.onError(t);
}
@Override
public void onComplete() {
List bs;
synchronized (this) {
bs = new ArrayList<>(buffers);
buffers.clear();
}
for (U b : bs) {
queue.offer(b);
}
done = true;
if (enter()) {
QueueDrainHelper.drainMaxLoop(queue, downstream, false, w, this);
}
}
@Override
public void request(long n) {
requested(n);
}
@Override
public void cancel() {
cancelled = true;
upstream.cancel();
w.dispose();
clear();
}
void clear() {
synchronized (this) {
buffers.clear();
}
}
@Override
public void run() {
if (cancelled) {
return;
}
final U b; // NOPMD
try {
b = Objects.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
cancel();
downstream.onError(e);
return;
}
synchronized (this) {
if (cancelled) {
return;
}
buffers.add(b);
}
w.schedule(new RemoveFromBuffer(b), timespan, unit);
}
@Override
public boolean accept(Subscriber a, U v) {
a.onNext(v);
return true;
}
final class RemoveFromBuffer implements Runnable {
private final U buffer;
RemoveFromBuffer(U buffer) {
this.buffer = buffer;
}
@Override
public void run() {
synchronized (BufferSkipBoundedSubscriber.this) {
buffers.remove(buffer);
}
fastPathOrderedEmitMax(buffer, false, w);
}
}
}
static final class BufferExactBoundedSubscriber>
extends QueueDrainSubscriber implements Subscription, Runnable, Disposable {
final Supplier bufferSupplier;
final long timespan;
final TimeUnit unit;
final int maxSize;
final boolean restartTimerOnMaxSize;
final Worker w;
U buffer;
Disposable timer;
Subscription upstream;
long producerIndex;
long consumerIndex;
BufferExactBoundedSubscriber(
Subscriber actual,
Supplier bufferSupplier,
long timespan, TimeUnit unit, int maxSize,
boolean restartOnMaxSize, Worker w) {
super(actual, new MpscLinkedQueue<>());
this.bufferSupplier = bufferSupplier;
this.timespan = timespan;
this.unit = unit;
this.maxSize = maxSize;
this.restartTimerOnMaxSize = restartOnMaxSize;
this.w = w;
}
@Override
public void onSubscribe(Subscription s) {
if (!SubscriptionHelper.validate(this.upstream, s)) {
return;
}
this.upstream = s;
U b;
try {
b = Objects.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
w.dispose();
s.cancel();
EmptySubscription.error(e, downstream);
return;
}
buffer = b;
downstream.onSubscribe(this);
timer = w.schedulePeriodically(this, timespan, timespan, unit);
s.request(Long.MAX_VALUE);
}
@Override
public void onNext(T t) {
U b;
synchronized (this) {
b = buffer;
if (b == null) {
return;
}
b.add(t);
if (b.size() < maxSize) {
return;
}
buffer = null;
producerIndex++;
}
if (restartTimerOnMaxSize) {
timer.dispose();
}
fastPathOrderedEmitMax(b, false, this);
try {
b = Objects.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
cancel();
downstream.onError(e);
return;
}
synchronized (this) {
buffer = b;
consumerIndex++;
}
if (restartTimerOnMaxSize) {
timer = w.schedulePeriodically(this, timespan, timespan, unit);
}
}
@Override
public void onError(Throwable t) {
synchronized (this) {
buffer = null;
}
downstream.onError(t);
w.dispose();
}
@Override
public void onComplete() {
U b;
synchronized (this) {
b = buffer;
buffer = null;
}
if (b != null) {
queue.offer(b);
done = true;
if (enter()) {
QueueDrainHelper.drainMaxLoop(queue, downstream, false, this, this);
}
w.dispose();
}
}
@Override
public boolean accept(Subscriber a, U v) {
a.onNext(v);
return true;
}
@Override
public void request(long n) {
requested(n);
}
@Override
public void cancel() {
if (!cancelled) {
cancelled = true;
dispose();
}
}
@Override
public void dispose() {
synchronized (this) {
buffer = null;
}
upstream.cancel();
w.dispose();
}
@Override
public boolean isDisposed() {
return w.isDisposed();
}
@Override
public void run() {
U next;
try {
next = Objects.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
cancel();
downstream.onError(e);
return;
}
U current;
synchronized (this) {
current = buffer;
if (current == null || producerIndex != consumerIndex) {
return;
}
buffer = next;
}
fastPathOrderedEmitMax(current, false, this);
}
}
}
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