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MonoSendMany.java
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MonoSendMany.java
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/*
* Copyright (c) 2019-2022 VMware, Inc. or its affiliates, All Rights Reserved.
*
* 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
*
* https://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 reactor.netty.channel;
import java.nio.channels.ClosedChannelException;
import java.util.AbstractMap;
import java.util.Map;
import java.util.Objects;
import java.util.Queue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.function.ToIntFunction;
import java.util.stream.Stream;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufHolder;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.channel.DefaultChannelPromise;
import io.netty.channel.EventLoop;
import io.netty.util.IllegalReferenceCountException;
import io.netty.util.ReferenceCountUtil;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.GenericFutureListener;
import org.reactivestreams.Publisher;
import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.core.Exceptions;
import reactor.core.Fuseable;
import reactor.core.Scannable;
import reactor.core.publisher.Operators;
import reactor.util.annotation.Nullable;
import reactor.util.concurrent.Queues;
import reactor.util.context.Context;
final class MonoSendMany<I, O> extends MonoSend<I, O> implements Scannable {
static final Object KEY_ON_DISCARD;
static {
Context context = Operators.enableOnDiscard(null, o -> { });
Map.Entry<Object, Object> entry = context.stream()
.findAny()
.orElse(null);
if (entry != null) {
KEY_ON_DISCARD = entry.getKey();
}
else {
KEY_ON_DISCARD = null;
}
}
static MonoSendMany<ByteBuf, ByteBuf> byteBufSource(Publisher<? extends ByteBuf> source,
Channel channel,
Predicate<ByteBuf> predicate) {
return new MonoSendMany<>(source, channel, predicate, TRANSFORMATION_FUNCTION_BB, CONSUMER_NOCHECK_CLEANUP, SIZE_OF_BB);
}
static MonoSendMany<?, ?> objectSource(Publisher<?> source, Channel channel, Predicate<Object> predicate) {
return new MonoSendMany<>(source, channel, predicate, TRANSFORMATION_FUNCTION, CONSUMER_NOCHECK_CLEANUP, SIZE_OF);
}
final Publisher<? extends I> source;
final Predicate<I> predicate;
MonoSendMany(Publisher<? extends I> source,
Channel channel,
Predicate<I> predicate,
Function<? super I, ? extends O> transformer,
Consumer<? super I> sourceCleanup,
ToIntFunction<O> sizeOf) {
super(channel, transformer, sourceCleanup, sizeOf);
this.source = Objects.requireNonNull(source, "source publisher cannot be null");
this.predicate = Objects.requireNonNull(predicate, "predicate cannot be null");
}
@Override
public void subscribe(CoreSubscriber<? super Void> destination) {
source.subscribe(new SendManyInner<>(this, destination));
}
@Override
@Nullable
@SuppressWarnings("rawtypes")
public Object scanUnsafe(Attr key) {
if (key == Attr.PREFETCH) {
return MAX_SIZE;
}
if (key == Attr.PARENT) {
return source;
}
return null;
}
static final class SendManyInner<I, O> implements CoreSubscriber<I>, Subscription,
Fuseable, Context, Consumer<I>,
ChannelFutureListener, Runnable, Scannable, ChannelPromise {
final ChannelHandlerContext ctx;
final EventLoop eventLoop;
final MonoSendMany<I, O> parent;
final CoreSubscriber<? super Void> actual;
final Context actualContext;
final Runnable asyncFlush;
@SuppressWarnings("unused")
volatile Subscription s;
@SuppressWarnings("unused")
volatile int wip;
Queue<I> queue;
int pending;
int requested;
int sourceMode;
boolean needFlush;
Throwable terminalSignal;
int nextRequest;
SendManyInner(MonoSendMany<I, O> parent, CoreSubscriber<? super Void> actual) {
this.parent = parent;
this.actual = actual;
this.actualContext = actual.currentContext();
this.requested = MAX_SIZE;
this.ctx = parent.ctx;
this.eventLoop = ctx.channel().eventLoop();
this.asyncFlush = new AsyncFlush();
//TODO should also cleanup on complete operation (ChannelOperation.OnTerminate) ?
ctx.channel()
.closeFuture()
.addListener(this);
}
@Override
public Context currentContext() {
return this;
}
@Override
public void cancel() {
if (!Operators.terminate(SUBSCRIPTION, this)) {
return;
}
int wip = wipIncrement(WIP, this);
if (wip == 0) {
onInterruptionCleanup();
}
}
@Override
public void onComplete() {
if (terminalSignal != null) {
return;
}
terminalSignal = Completion.INSTANCE;
trySchedule();
}
@Override
public void onError(Throwable t) {
if (terminalSignal != null) {
Operators.onErrorDropped(t, actualContext);
return;
}
if (t instanceof ClosedChannelException) {
t = new AbortedException(t);
}
terminalSignal = t;
trySchedule();
}
@Override
public void onNext(I t) {
if (sourceMode == ASYNC) {
trySchedule();
return;
}
if (terminalSignal != null) {
parent.sourceCleanup.accept(t);
Operators.onDiscard(t, actualContext);
return;
}
// ReferenceCountUtil.touch(t);
if (!queue.offer(t)) {
onError(Operators.onOperatorError(s,
Exceptions.failWithOverflow(Exceptions.BACKPRESSURE_ERROR_QUEUE_FULL),
t,
actualContext));
return;
}
trySchedule();
}
@Override
public void onSubscribe(Subscription s) {
if (Operators.setOnce(SUBSCRIPTION, this, s)) {
if (s instanceof QueueSubscription) {
@SuppressWarnings("unchecked") QueueSubscription<I> f =
(QueueSubscription<I>) s;
int m = f.requestFusion(Fuseable.ANY | Fuseable.THREAD_BARRIER);
if (m == Fuseable.SYNC) {
sourceMode = Fuseable.SYNC;
queue = f;
terminalSignal = Completion.INSTANCE;
actual.onSubscribe(this);
trySchedule();
return;
}
if (m == Fuseable.ASYNC) {
sourceMode = Fuseable.ASYNC;
queue = f;
actual.onSubscribe(this);
s.request(MAX_SIZE);
return;
}
}
queue = Queues.<I>get(MAX_SIZE).get();
actual.onSubscribe(this);
s.request(MAX_SIZE);
}
else {
queue = Queues.<I>empty().get();
}
}
@Override
public void request(long n) {
//ignore since downstream has no demand
}
@Override
public void operationComplete(ChannelFuture future) {
if (Operators.terminate(SUBSCRIPTION, this)) {
int wip = wipIncrement(WIP, this);
if (wip == 0) {
onInterruptionCleanup();
}
//actual.onError(new AbortedException("Closed channel ["+ctx.channel().id().asShortText()+"] while sending operation active"));
actual.onComplete();
}
}
@Override
@SuppressWarnings("FutureReturnValueIgnored")
public void run() {
Queue<I> queue = this.queue;
try {
int missed = 1;
for (;;) {
int r = requested;
while (Integer.MAX_VALUE == r || r-- > 0) {
I sourceMessage = queue.poll();
if (sourceMessage == null) {
break;
}
if (s == Operators.cancelledSubscription()) {
parent.sourceCleanup.accept(sourceMessage);
Operators.onDiscard(sourceMessage, actualContext);
onInterruptionCleanup();
return;
}
O encodedMessage = parent.transformer.apply(sourceMessage);
if (encodedMessage == null) {
if (parent.predicate.test(sourceMessage)) {
nextRequest++;
needFlush = false;
ctx.flush();
}
continue;
}
int readableBytes = parent.sizeOf.applyAsInt(encodedMessage);
if (readableBytes == 0 && !(encodedMessage instanceof ByteBufHolder)) {
ReferenceCountUtil.release(encodedMessage);
nextRequest++;
continue;
}
pending++;
//"FutureReturnValueIgnored" this is deliberate
ctx.write(encodedMessage, this);
if (parent.predicate.test(sourceMessage) || !ctx.channel().isWritable() || readableBytes > ctx.channel().bytesBeforeUnwritable()) {
needFlush = false;
ctx.flush();
}
else {
needFlush = true;
}
}
if (needFlush && pending != 0) {
needFlush = false;
eventLoop.execute(asyncFlush);
}
if (Operators.cancelledSubscription() == s) {
onInterruptionCleanup();
return;
}
if (checkTerminated() && queue.isEmpty()) {
ctx.channel()
.closeFuture()
.removeListener(this);
Throwable t = terminalSignal;
if (t == Completion.INSTANCE) {
actual.onComplete();
}
else {
actual.onError(t);
}
return;
}
int nextRequest = this.nextRequest;
if (terminalSignal == null && nextRequest != 0) {
this.nextRequest = 0;
s.request(nextRequest);
}
missed = WIP.addAndGet(this, -missed);
if (missed == 0) {
break;
}
}
}
catch (Throwable t) {
onInterruptionCleanup();
if (Operators.terminate(SUBSCRIPTION, this)) {
actual.onError(t);
}
else {
Operators.onErrorDropped(t, actualContext);
}
}
}
@SuppressWarnings("FutureReturnValueIgnored")
void onInterruptionCleanup() {
//"FutureReturnValueIgnored" this is deliberate
ctx.channel()
.closeFuture()
.removeListener(this);
Queue<I> queue = this.queue;
if (queue == null) {
return;
}
if (sourceMode == ASYNC) {
// delegates discarding to the queue holder to ensure there is no racing on draining from the SpScQueue
// fused queue should discard elements on clear
discardAsyncWithTermination(WIP, this, queue);
}
else {
Context context = currentContext();
discardWithTermination(WIP, this, queue, context);
}
}
boolean checkTerminated() {
return pending == 0 && terminalSignal != null;
}
void trySchedule() {
int wip = wipIncrement(WIP, this);
if (wip != 0) {
if (wip == Integer.MIN_VALUE) {
if (sourceMode == ASYNC) {
queue.clear();
}
else {
Operators.onDiscardQueueWithClear(queue, currentContext(), null);
}
}
return;
}
try {
if (eventLoop.inEventLoop()) {
run();
return;
}
eventLoop.execute(this);
}
catch (Throwable t) {
if (Operators.terminate(SUBSCRIPTION, this)) {
onInterruptionCleanup();
actual.onError(Operators.onRejectedExecution(t, null, null, null, actualContext));
}
}
}
@Override
@SuppressWarnings("rawtypes")
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) {
return s;
}
if (key == Attr.ACTUAL) {
return actual;
}
if (key == Attr.REQUESTED_FROM_DOWNSTREAM) {
return requested;
}
if (key == Attr.CANCELLED) {
return Operators.cancelledSubscription() == s;
}
if (key == Attr.TERMINATED) {
return terminalSignal != null;
}
if (key == Attr.BUFFERED) {
return queue != null ? queue.size() : 0;
}
if (key == Attr.ERROR) {
return !hasOnComplete() ? terminalSignal : null;
}
if (key == Attr.PREFETCH) {
return MAX_SIZE;
}
return null;
}
@Override
public Channel channel() {
return ctx.channel();
}
@Override
public ChannelPromise setSuccess(Void result) {
trySuccess(null);
return this;
}
@Override
public ChannelPromise setSuccess() {
trySuccess(null);
return this;
}
@Override
public boolean trySuccess() {
trySuccess(null);
return true;
}
@Override
public ChannelPromise setFailure(Throwable cause) {
if (tryFailure(cause)) {
return this;
}
Operators.onErrorDropped(cause, actualContext);
return this;
}
@Override
public ChannelPromise addListener(GenericFutureListener<? extends Future<? super Void>> listener) {
throw new UnsupportedOperationException();
}
@SuppressWarnings("unchecked")
@Override
public ChannelPromise addListeners(GenericFutureListener<? extends Future<? super Void>>... listeners) {
throw new UnsupportedOperationException();
}
@Override
public ChannelPromise removeListener(GenericFutureListener<? extends Future<? super Void>> listener) {
return this;
}
@SuppressWarnings("unchecked")
@Override
public ChannelPromise removeListeners(GenericFutureListener<? extends Future<? super Void>>... listeners) {
return this;
}
@Override
public ChannelPromise sync() {
throw new UnsupportedOperationException();
}
@Override
public ChannelPromise syncUninterruptibly() {
throw new UnsupportedOperationException();
}
@Override
public ChannelPromise await() {
throw new UnsupportedOperationException();
}
@Override
public ChannelPromise awaitUninterruptibly() {
throw new UnsupportedOperationException();
}
@Override
public ChannelPromise unvoid() {
return new DefaultChannelPromise(ctx.channel()) {
@Override
public ChannelPromise setSuccess(Void result) {
super.trySuccess(null);
SendManyInner.this.trySuccess(null);
return this;
}
@Override
public boolean trySuccess(Void result) {
super.trySuccess(null);
return SendManyInner.this.trySuccess(null);
}
@Override
public ChannelPromise setFailure(Throwable cause) {
super.tryFailure(cause);
SendManyInner.this.tryFailure(cause);
return this;
}
@Override
public boolean tryFailure(Throwable cause) {
super.tryFailure(cause);
return SendManyInner.this.tryFailure(cause);
}
};
}
@Override
public boolean isVoid() {
return false;
}
@Override
public boolean trySuccess(Void result) {
requested--;
pending--;
if (checkTerminated()) {
if (sourceMode == SYNC && requested <= REFILL_SIZE) {
int u = MAX_SIZE - requested;
requested += u;
nextRequest += u;
}
trySchedule();
return true;
}
if (requested <= REFILL_SIZE) {
int u = MAX_SIZE - requested;
requested += u;
nextRequest += u;
trySchedule();
}
return true;
}
@Override
public boolean tryFailure(Throwable cause) {
if (Operators.terminate(SUBSCRIPTION, this)) {
int wip = wipIncrement(WIP, this);
if (wip == 0) {
onInterruptionCleanup();
}
actual.onError(cause);
}
return true;
}
@Override
public boolean setUncancellable() {
return true;
}
@Override
public boolean isSuccess() {
return hasOnComplete() && queue.isEmpty();
}
@Override
public boolean isCancellable() {
return false;
}
@Override
@Nullable
public Throwable cause() {
return null;
}
@Override
public boolean await(long timeout, TimeUnit unit) {
return false;
}
@Override
public boolean await(long timeoutMillis) {
throw new UnsupportedOperationException();
}
@Override
public boolean awaitUninterruptibly(long timeout, TimeUnit unit) {
throw new UnsupportedOperationException();
}
@Override
public boolean awaitUninterruptibly(long timeoutMillis) {
throw new UnsupportedOperationException();
}
@Override
public Void getNow() {
throw new UnsupportedOperationException();
}
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
return false;
}
@Override
public boolean isCancelled() {
return false;
}
@Override
public boolean isDone() {
return false;
}
@Override
public Void get() {
throw new UnsupportedOperationException();
}
@Override
public Void get(long timeout, TimeUnit unit) {
throw new UnsupportedOperationException();
}
// this as discard hook
@Override
public void accept(I i) {
try {
parent.sourceCleanup.accept(i);
}
catch (IllegalReferenceCountException e) {
// FIXME: should be removed once fusion is fixed in reactor-core
// for now we have double releasing issue
}
// propagates discard to the downstream
Operators.onDiscard(i, actualContext);
}
// Context interface impl
@Override
@SuppressWarnings({"unchecked", "rawtypes", "TypeParameterUnusedInFormals"})
public <T> T get(Object key) {
if (KEY_ON_DISCARD == key) {
return (T) this;
}
return actualContext.get(key);
}
@Override
public boolean hasKey(Object key) {
if (KEY_ON_DISCARD == key) {
return true;
}
return actualContext.hasKey(key);
}
@Override
public Context put(Object key, Object value) {
Context context = actualContext;
if (context.isEmpty()) {
if (key == KEY_ON_DISCARD) {
return Context.of(key, value);
}
return Context.of(KEY_ON_DISCARD, this, key, value);
}
return context.put(KEY_ON_DISCARD, this)
.put(key, value);
}
@Override
public Context delete(Object key) {
Context context = actualContext;
if (context.isEmpty()) {
if (key == KEY_ON_DISCARD) {
return Context.empty();
}
else {
return this;
}
}
return context .put(KEY_ON_DISCARD, this)
.delete(key);
}
@Override
public void forEach(BiConsumer<Object, Object> action) {
action.accept(KEY_ON_DISCARD, this);
actualContext.delete(KEY_ON_DISCARD).forEach(action);
}
@Override
public int size() {
Context context = actualContext;
if (context.hasKey(KEY_ON_DISCARD)) {
return context.size();
}
return context.size() + 1;
}
@Override
public Stream<Map.Entry<Object, Object>> stream() {
Context context = actualContext;
if (context.isEmpty()) {
return Stream.of(new AbstractMap.SimpleEntry<>(KEY_ON_DISCARD, this));
}
return context.put(KEY_ON_DISCARD, this)
.stream();
}
@SuppressWarnings("rawtypes")
static final AtomicIntegerFieldUpdater<SendManyInner> WIP =
AtomicIntegerFieldUpdater.newUpdater(SendManyInner.class, "wip");
@SuppressWarnings("rawtypes")
static final AtomicReferenceFieldUpdater<SendManyInner, Subscription> SUBSCRIPTION =
AtomicReferenceFieldUpdater.newUpdater(SendManyInner.class, Subscription.class, "s");
final class AsyncFlush implements Runnable {
@Override
public void run() {
if (pending != 0) {
ctx.flush();
}
}
}
boolean hasOnComplete() {
return terminalSignal == Completion.INSTANCE;
}
}
static final class Completion extends Exception {
static final Completion INSTANCE = new Completion();
@Override
public synchronized Throwable fillInStackTrace() {
return this;
}
private static final long serialVersionUID = 8284666103614054915L;
}
static <T> int wipIncrement(AtomicIntegerFieldUpdater<T> updater, T instance) {
for (;;) {
int wip = updater.get(instance);
if (wip == Integer.MIN_VALUE) {
return Integer.MIN_VALUE;
}
if (updater.compareAndSet(instance, wip, wip + 1)) {
return wip;
}
}
}
static <T> void discardWithTermination(
AtomicIntegerFieldUpdater<T> updater,
T instance,
Queue<?> q,
Context context) {
for (;;) {
int wip = updater.get(instance);
// In all other modes we are free to discard queue immediately
// since there is no racing on polling
Operators.onDiscardQueueWithClear(q, context, null);
if (updater.compareAndSet(instance, wip, Integer.MIN_VALUE)) {
break;
}
}
}
static <T> void discardAsyncWithTermination(AtomicIntegerFieldUpdater<T> updater,
T instance,
Queue<?> q) {
for (;;) {
int wip = updater.get(instance);
// delegates discarding to the queue holder to ensure there is no racing on draining from the SpScQueue
q.clear();
if (updater.compareAndSet(instance, wip, Integer.MIN_VALUE)) {
break;
}
}
}
}