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rxjava2-backport developed by David Karnok
/**
* Copyright 2015 David Karnok and Netflix, Inc.
*
* 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 hu.akarnokd.rxjava2.internal.operators;
import java.util.Queue;
import java.util.concurrent.atomic.*;
import org.reactivestreams.*;
import hu.akarnokd.rxjava2.Observable.Operator;
import hu.akarnokd.rxjava2.Scheduler;
import hu.akarnokd.rxjava2.exceptions.MissingBackpressureException;
import hu.akarnokd.rxjava2.internal.queue.*;
import hu.akarnokd.rxjava2.internal.schedulers.TrampolineScheduler;
import hu.akarnokd.rxjava2.internal.subscriptions.SubscriptionHelper;
import hu.akarnokd.rxjava2.internal.util.*;
import hu.akarnokd.rxjava2.plugins.RxJavaPlugins;
public final class OperatorObserveOn implements Operator {
final Scheduler scheduler;
final boolean delayError;
final int bufferSize;
public OperatorObserveOn(Scheduler scheduler, boolean delayError, int bufferSize) {
this.scheduler = scheduler;
this.delayError = delayError;
this.bufferSize = bufferSize;
}
@Override
public Subscriber apply(Subscriber t) {
if (scheduler instanceof TrampolineScheduler) {
return t;
}
Scheduler.Worker w = scheduler.createWorker();
return new ObserveOnSubscriber(t, w, delayError, bufferSize);
}
/**
* Pads the base atomic integer used for wip counting.
*/
static class Padding0 extends AtomicInteger {
/** */
private static final long serialVersionUID = 3172843496016154809L;
volatile long p01, p02, p03, p04, p05, p06, p07;
}
/**
* Contains the requested amount.
*/
static class Padding1 extends Padding0 {
/** */
private static final long serialVersionUID = 7659422588548271214L;
volatile long requested;
static final AtomicLongFieldUpdater REQUESTED =
AtomicLongFieldUpdater.newUpdater(Padding1.class, "requested");
}
/**
* Pads the requested amount away from the effectively constant fields
*/
static class Padding2 extends Padding1 {
/** */
private static final long serialVersionUID = 227348361328175380L;
volatile long p11, p12, p13, p14, p15, p16, p17;
}
static final class ObserveOnSubscriber extends Padding2 implements Subscriber, Subscription, Runnable {
/** */
private static final long serialVersionUID = 6576896619930983584L;
final Subscriber actual;
final Scheduler.Worker worker;
final boolean delayError;
final int bufferSize;
final Queue queue;
Subscription s;
Throwable error;
volatile boolean done;
volatile boolean cancelled;
public ObserveOnSubscriber(Subscriber actual, Scheduler.Worker worker, boolean delayError, int bufferSize) {
this.actual = actual;
this.worker = worker;
this.delayError = delayError;
this.bufferSize = bufferSize;
Queue q;
if (Pow2.isPowerOfTwo(bufferSize)) {
q = new SpscArrayQueue(bufferSize);
} else {
q = new SpscExactArrayQueue(bufferSize);
}
this.queue = q;
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validateSubscription(this.s, s)) {
return;
}
this.s = s;
actual.onSubscribe(this);
s.request(bufferSize);
}
@Override
public void onNext(T t) {
if (done) {
return;
}
if (!queue.offer(t)) {
s.cancel();
onError(new MissingBackpressureException("Queue full?!"));
return;
}
schedule();
}
@Override
public void onError(Throwable t) {
if (done) {
RxJavaPlugins.onError(t);
return;
}
error = t;
done = true;
schedule();
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
schedule();
}
@Override
public void request(long n) {
if (SubscriptionHelper.validateRequest(n)) {
return;
}
BackpressureHelper.add(REQUESTED, this, n);
schedule();
}
@Override
public void cancel() {
if (!cancelled) {
cancelled = true;
s.cancel();
worker.dispose();
}
}
void schedule() {
if (getAndIncrement() == 0) {
worker.schedule(this);
}
}
@Override
public void run() {
int missed = 1;
final Queue q = queue;
final Subscriber a = actual;
for (;;) {
if (checkTerminated(done, q.isEmpty(), a)) {
return;
}
long r = requested;
long e = 0L;
boolean unbounded = r == Long.MAX_VALUE;
while (r != 0L) {
boolean d = done;
T v = q.poll();
boolean empty = v == null;
if (checkTerminated(d, empty, a)) {
return;
}
if (empty) {
break;
}
a.onNext(v);
r--;
e++;
}
if (cancelled) {
return;
}
if (e != 0L) {
if (!unbounded) {
REQUESTED.addAndGet(this, -e);
}
s.request(e);
}
missed = addAndGet(-missed);
if (missed == 0) {
break;
}
}
}
boolean checkTerminated(boolean d, boolean empty, Subscriber a) {
if (cancelled) {
s.cancel();
worker.dispose();
return true;
}
if (d) {
Throwable e = error;
if (delayError) {
if (empty) {
if (e != null) {
a.onError(e);
} else {
a.onComplete();
}
worker.dispose();
return true;
}
} else {
if (e != null) {
a.onError(e);
worker.dispose();
return true;
} else
if (empty) {
a.onComplete();
worker.dispose();
return true;
}
}
}
return false;
}
}
}
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