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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.observable;
import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicReference;
import io.reactivex.*;
import io.reactivex.Observer;
import io.reactivex.Scheduler.Worker;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.internal.disposables.*;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.observers.QueueDrainObserver;
import io.reactivex.internal.queue.MpscLinkedQueue;
import io.reactivex.internal.util.QueueDrainHelper;
import io.reactivex.observers.SerializedObserver;
public final class ObservableBufferTimed>
extends AbstractObservableWithUpstream {
final long timespan;
final long timeskip;
final TimeUnit unit;
final Scheduler scheduler;
final Callable bufferSupplier;
final int maxSize;
final boolean restartTimerOnMaxSize;
public ObservableBufferTimed(ObservableSource source, long timespan, long timeskip, TimeUnit unit, Scheduler scheduler, Callable 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(Observer t) {
if (timespan == timeskip && maxSize == Integer.MAX_VALUE) {
source.subscribe(new BufferExactUnboundedObserver(
new SerializedObserver(t),
bufferSupplier, timespan, unit, scheduler));
return;
}
Scheduler.Worker w = scheduler.createWorker();
if (timespan == timeskip) {
source.subscribe(new BufferExactBoundedObserver(
new SerializedObserver(t),
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 BufferSkipBoundedObserver(
new SerializedObserver(t),
bufferSupplier, timespan, timeskip, unit, w));
}
static final class BufferExactUnboundedObserver>
extends QueueDrainObserver implements Runnable, Disposable {
final Callable bufferSupplier;
final long timespan;
final TimeUnit unit;
final Scheduler scheduler;
Disposable upstream;
U buffer;
final AtomicReference timer = new AtomicReference();
BufferExactUnboundedObserver(
Observer actual, Callable 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(Disposable d) {
if (DisposableHelper.validate(this.upstream, d)) {
this.upstream = d;
U b;
try {
b = ObjectHelper.requireNonNull(bufferSupplier.call(), "The buffer supplied is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
dispose();
EmptyDisposable.error(e, downstream);
return;
}
buffer = b;
downstream.onSubscribe(this);
if (!cancelled) {
Disposable task = scheduler.schedulePeriodicallyDirect(this, timespan, timespan, unit);
if (!timer.compareAndSet(null, task)) {
task.dispose();
}
}
}
}
@Override
public void onNext(T t) {
synchronized (this) {
U b = buffer;
if (b == null) {
return;
}
b.add(t);
}
}
@Override
public void onError(Throwable t) {
synchronized (this) {
buffer = null;
}
downstream.onError(t);
DisposableHelper.dispose(timer);
}
@Override
public void onComplete() {
U b;
synchronized (this) {
b = buffer;
buffer = null;
}
if (b != null) {
queue.offer(b);
done = true;
if (enter()) {
QueueDrainHelper.drainLoop(queue, downstream, false, null, this);
}
}
DisposableHelper.dispose(timer);
}
@Override
public void dispose() {
DisposableHelper.dispose(timer);
upstream.dispose();
}
@Override
public boolean isDisposed() {
return timer.get() == DisposableHelper.DISPOSED;
}
@Override
public void run() {
U next;
try {
next = ObjectHelper.requireNonNull(bufferSupplier.call(), "The bufferSupplier returned a null buffer");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
downstream.onError(e);
dispose();
return;
}
U current;
synchronized (this) {
current = buffer;
if (current != null) {
buffer = next;
}
}
if (current == null) {
DisposableHelper.dispose(timer);
return;
}
fastPathEmit(current, false, this);
}
@Override
public void accept(Observer a, U v) {
downstream.onNext(v);
}
}
static final class BufferSkipBoundedObserver>
extends QueueDrainObserver implements Runnable, Disposable {
final Callable bufferSupplier;
final long timespan;
final long timeskip;
final TimeUnit unit;
final Worker w;
final List buffers;
Disposable upstream;
BufferSkipBoundedObserver(Observer actual,
Callable 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(Disposable d) {
if (DisposableHelper.validate(this.upstream, d)) {
this.upstream = d;
final U b; // NOPMD
try {
b = ObjectHelper.requireNonNull(bufferSupplier.call(), "The buffer supplied is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
d.dispose();
EmptyDisposable.error(e, downstream);
w.dispose();
return;
}
buffers.add(b);
downstream.onSubscribe(this);
w.schedulePeriodically(this, timeskip, timeskip, unit);
w.schedule(new RemoveFromBufferEmit(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;
clear();
downstream.onError(t);
w.dispose();
}
@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.drainLoop(queue, downstream, false, w, this);
}
}
@Override
public void dispose() {
if (!cancelled) {
cancelled = true;
clear();
upstream.dispose();
w.dispose();
}
}
@Override
public boolean isDisposed() {
return cancelled;
}
void clear() {
synchronized (this) {
buffers.clear();
}
}
@Override
public void run() {
if (cancelled) {
return;
}
final U b; // NOPMD
try {
b = ObjectHelper.requireNonNull(bufferSupplier.call(), "The bufferSupplier returned a null buffer");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
downstream.onError(e);
dispose();
return;
}
synchronized (this) {
if (cancelled) {
return;
}
buffers.add(b);
}
w.schedule(new RemoveFromBuffer(b), timespan, unit);
}
@Override
public void accept(Observer a, U v) {
a.onNext(v);
}
final class RemoveFromBuffer implements Runnable {
private final U b;
RemoveFromBuffer(U b) {
this.b = b;
}
@Override
public void run() {
synchronized (BufferSkipBoundedObserver.this) {
buffers.remove(b);
}
fastPathOrderedEmit(b, false, w);
}
}
final class RemoveFromBufferEmit implements Runnable {
private final U buffer;
RemoveFromBufferEmit(U buffer) {
this.buffer = buffer;
}
@Override
public void run() {
synchronized (BufferSkipBoundedObserver.this) {
buffers.remove(buffer);
}
fastPathOrderedEmit(buffer, false, w);
}
}
}
static final class BufferExactBoundedObserver>
extends QueueDrainObserver implements Runnable, Disposable {
final Callable bufferSupplier;
final long timespan;
final TimeUnit unit;
final int maxSize;
final boolean restartTimerOnMaxSize;
final Worker w;
U buffer;
Disposable timer;
Disposable upstream;
long producerIndex;
long consumerIndex;
BufferExactBoundedObserver(
Observer actual,
Callable 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(Disposable d) {
if (DisposableHelper.validate(this.upstream, d)) {
this.upstream = d;
U b;
try {
b = ObjectHelper.requireNonNull(bufferSupplier.call(), "The buffer supplied is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
d.dispose();
EmptyDisposable.error(e, downstream);
w.dispose();
return;
}
buffer = b;
downstream.onSubscribe(this);
timer = w.schedulePeriodically(this, timespan, timespan, unit);
}
}
@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();
}
fastPathOrderedEmit(b, false, this);
try {
b = ObjectHelper.requireNonNull(bufferSupplier.call(), "The buffer supplied is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
downstream.onError(e);
dispose();
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() {
w.dispose();
U b;
synchronized (this) {
b = buffer;
buffer = null;
}
queue.offer(b);
done = true;
if (enter()) {
QueueDrainHelper.drainLoop(queue, downstream, false, this, this);
}
}
@Override
public void accept(Observer a, U v) {
a.onNext(v);
}
@Override
public void dispose() {
if (!cancelled) {
cancelled = true;
upstream.dispose();
w.dispose();
synchronized (this) {
buffer = null;
}
}
}
@Override
public boolean isDisposed() {
return cancelled;
}
@Override
public void run() {
U next;
try {
next = ObjectHelper.requireNonNull(bufferSupplier.call(), "The bufferSupplier returned a null buffer");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
dispose();
downstream.onError(e);
return;
}
U current;
synchronized (this) {
current = buffer;
if (current == null || producerIndex != consumerIndex) {
return;
}
buffer = next;
}
fastPathOrderedEmit(current, false, this);
}
}
}
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