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Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC
/*
* Copyright (c) 2016-2021 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.core.publisher;
import java.util.Objects;
import java.util.function.BiPredicate;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Supplier;
import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.core.Fuseable;
import reactor.core.Fuseable.ConditionalSubscriber;
import reactor.core.Fuseable.QueueSubscription;
import reactor.util.annotation.Nullable;
import reactor.util.context.Context;
/**
* For each subscriber, tracks the source values that have been seen and
* filters out duplicates.
*
* @param the source value type
* @param the key extracted from the source value to be used for duplicate testing
* @param the backing store type used together with the keys when testing for duplicates with {@link BiPredicate}
*
* @see Reactive-Streams-Commons
*/
final class FluxDistinct extends InternalFluxOperator {
final Function keyExtractor;
final Supplier collectionSupplier;
final BiPredicate distinctPredicate;
final Consumer cleanupCallback;
FluxDistinct(Flux source,
Function keyExtractor,
Supplier collectionSupplier,
BiPredicate distinctPredicate,
Consumer cleanupCallback) {
super(source);
this.keyExtractor = Objects.requireNonNull(keyExtractor, "keyExtractor");
this.collectionSupplier = Objects.requireNonNull(collectionSupplier, "collectionSupplier");
this.distinctPredicate = Objects.requireNonNull(distinctPredicate, "distinctPredicate");
this.cleanupCallback = Objects.requireNonNull(cleanupCallback, "cleanupCallback");
}
@Override
@SuppressWarnings("unchecked")
public CoreSubscriber subscribeOrReturn(CoreSubscriber actual) {
C collection = Objects.requireNonNull(collectionSupplier.get(),
"The collectionSupplier returned a null collection");
if (actual instanceof ConditionalSubscriber) {
return new DistinctConditionalSubscriber<>((ConditionalSubscriber) actual,
collection,
keyExtractor,
distinctPredicate, cleanupCallback);
}
else {
return new DistinctSubscriber<>(actual, collection, keyExtractor, distinctPredicate,
cleanupCallback);
}
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return super.scanUnsafe(key);
}
static final class DistinctSubscriber
implements ConditionalSubscriber, InnerOperator {
final CoreSubscriber actual;
final Context ctx;
final C collection;
final Function keyExtractor;
final BiPredicate distinctPredicate;
final Consumer cleanupCallback;
Subscription s;
boolean done;
DistinctSubscriber(CoreSubscriber actual,
C collection,
Function keyExtractor,
BiPredicate distinctPredicate,
Consumer cleanupCallback) {
this.actual = actual;
this.ctx = actual.currentContext();
this.collection = collection;
this.keyExtractor = keyExtractor;
this.distinctPredicate = distinctPredicate;
this.cleanupCallback = cleanupCallback;
}
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.s, s)) {
this.s = s;
actual.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
if (!tryOnNext(t)) {
s.request(1);
}
}
@Override
public boolean tryOnNext(T t) {
if (done) {
Operators.onNextDropped(t, this.ctx);
return true;
}
K k;
try {
k = Objects.requireNonNull(keyExtractor.apply(t),
"The distinct extractor returned a null value.");
}
catch (Throwable e) {
onError(Operators.onOperatorError(s, e, t, this.ctx));
Operators.onDiscard(t, this.ctx);
return true;
}
boolean b;
try {
b = distinctPredicate.test(collection, k);
}
catch (Throwable e) {
onError(Operators.onOperatorError(s, e, t, ctx));
Operators.onDiscard(t, this.ctx);
return true;
}
if (b) {
actual.onNext(t);
return true;
}
Operators.onDiscard(t , ctx);
return false;
}
@Override
public void onError(Throwable t) {
if (done) {
Operators.onErrorDropped(t, this.ctx);
return;
}
done = true;
cleanupCallback.accept(collection);
actual.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
cleanupCallback.accept(collection);
actual.onComplete();
}
@Override
public CoreSubscriber actual() {
return actual;
}
@Override
public void request(long n) {
s.request(n);
}
@Override
public void cancel() {
s.cancel();
if (collection != null) {
cleanupCallback.accept(collection);
}
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return s;
if (key == Attr.TERMINATED) return done;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return InnerOperator.super.scanUnsafe(key);
}
}
static final class DistinctConditionalSubscriber
implements ConditionalSubscriber, InnerOperator {
final ConditionalSubscriber actual;
final Context ctx;
final C collection;
final Function keyExtractor;
final BiPredicate distinctPredicate;
final Consumer cleanupCallback;
Subscription s;
boolean done;
DistinctConditionalSubscriber(ConditionalSubscriber actual,
C collection,
Function keyExtractor,
BiPredicate distinctPredicate,
Consumer cleanupCallback) {
this.actual = actual;
this.ctx = actual.currentContext();
this.collection = collection;
this.keyExtractor = keyExtractor;
this.distinctPredicate = distinctPredicate;
this.cleanupCallback = cleanupCallback;
}
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.s, s)) {
this.s = s;
actual.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
if (done) {
Operators.onNextDropped(t, this.ctx);
return;
}
K k;
try {
k = Objects.requireNonNull(keyExtractor.apply(t),
"The distinct extractor returned a null value.");
}
catch (Throwable e) {
onError(Operators.onOperatorError(s, e, t, this.ctx));
Operators.onDiscard(t, this.ctx);
return;
}
boolean b;
try {
b = distinctPredicate.test(collection, k);
}
catch (Throwable e) {
onError(Operators.onOperatorError(s, e, t, this.ctx));
Operators.onDiscard(t, this.ctx);
return;
}
if (b) {
actual.onNext(t);
}
else {
Operators.onDiscard(t, ctx);
s.request(1);
}
}
@Override
public boolean tryOnNext(T t) {
if (done) {
Operators.onNextDropped(t, this.ctx);
return true;
}
K k;
try {
k = Objects.requireNonNull(keyExtractor.apply(t),
"The distinct extractor returned a null value.");
}
catch (Throwable e) {
onError(Operators.onOperatorError(s, e, t, this.ctx));
Operators.onDiscard(t, this.ctx);
return true;
}
boolean b;
try {
b = distinctPredicate.test(collection, k);
}
catch (Throwable e) {
onError(Operators.onOperatorError(s, e, t, this.ctx));
Operators.onDiscard(t, this.ctx);
return true;
}
if (b) {
return actual.tryOnNext(t);
}
else {
Operators.onDiscard(t, ctx);
return false;
}
}
@Override
public void onError(Throwable t) {
if (done) {
Operators.onErrorDropped(t, this.ctx);
return;
}
done = true;
cleanupCallback.accept(collection);
actual.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
cleanupCallback.accept(collection);
actual.onComplete();
}
@Override
public CoreSubscriber actual() {
return actual;
}
@Override
public void request(long n) {
s.request(n);
}
@Override
public void cancel() {
s.cancel();
if (collection != null) {
cleanupCallback.accept(collection);
}
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return s;
if (key == Attr.TERMINATED) return done;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return InnerOperator.super.scanUnsafe(key);
}
}
static final class DistinctFuseableSubscriber
implements ConditionalSubscriber, InnerOperator,
QueueSubscription {
final CoreSubscriber actual;
final Context ctx;
final C collection;
final Function keyExtractor;
final BiPredicate distinctPredicate;
final Consumer cleanupCallback;
QueueSubscription qs;
boolean done;
int sourceMode;
DistinctFuseableSubscriber(CoreSubscriber actual, C collection,
Function keyExtractor,
BiPredicate predicate,
Consumer callback) {
this.actual = actual;
this.ctx = actual.currentContext();
this.collection = collection;
this.keyExtractor = keyExtractor;
this.distinctPredicate = predicate;
this.cleanupCallback = callback;
}
@SuppressWarnings("unchecked")
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.qs, s)) {
this.qs = (QueueSubscription) s;
actual.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
if (!tryOnNext(t)) {
qs.request(1);
}
}
@Override
public boolean tryOnNext(T t) {
if (sourceMode == Fuseable.ASYNC) {
actual.onNext(null);
return true;
}
if (done) {
Operators.onNextDropped(t, this.ctx);
return true;
}
K k;
try {
k = Objects.requireNonNull(keyExtractor.apply(t),
"The distinct extractor returned a null value.");
}
catch (Throwable e) {
onError(Operators.onOperatorError(qs, e, t, this.ctx));
Operators.onDiscard(t, this.ctx);
return true;
}
boolean b;
try {
b = distinctPredicate.test(collection, k);
}
catch (Throwable e) {
onError(Operators.onOperatorError(qs, e, t, this.ctx));
Operators.onDiscard(t, this.ctx);
return true;
}
if (b) {
actual.onNext(t);
return true;
}
Operators.onDiscard(t, ctx);
return false;
}
@Override
public void onError(Throwable t) {
if (done) {
Operators.onErrorDropped(t, this.ctx);
return;
}
done = true;
cleanupCallback.accept(collection);
actual.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
cleanupCallback.accept(collection);
actual.onComplete();
}
@Override
public CoreSubscriber actual() {
return actual;
}
@Override
public void request(long n) {
qs.request(n);
}
@Override
public void cancel() {
qs.cancel();
if (collection != null) {
cleanupCallback.accept(collection);
}
}
@Override
public int requestFusion(int requestedMode) {
int m = qs.requestFusion(requestedMode);
sourceMode = m;
return m;
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return qs;
if (key == Attr.TERMINATED) return done;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return InnerOperator.super.scanUnsafe(key);
}
@Override
@Nullable
public T poll() {
if (sourceMode == Fuseable.ASYNC) {
long dropped = 0;
for (; ; ) {
T v = qs.poll();
if (v == null) {
return null;
}
try {
K r = Objects.requireNonNull(keyExtractor.apply(v),
"The keyExtractor returned a null collection");
if (distinctPredicate.test(collection, r)) {
if (dropped != 0) {
request(dropped);
}
return v;
}
Operators.onDiscard(v, ctx);
dropped++;
}
catch (Throwable error) {
Operators.onDiscard(v, this.ctx);
throw error;
}
}
}
else {
for (; ; ) {
T v = qs.poll();
if (v == null) {
return null;
}
try {
K r = Objects.requireNonNull(keyExtractor.apply(v),
"The keyExtractor returned a null collection");
if (distinctPredicate.test(collection, r)) {
return v;
}
else {
Operators.onDiscard(v, ctx);
}
}
catch (Throwable error) {
Operators.onDiscard(v, this.ctx);
throw error;
}
}
}
}
@Override
public boolean isEmpty() {
return qs.isEmpty();
}
@Override
public void clear() {
qs.clear();
cleanupCallback.accept(collection);
}
@Override
public int size() {
return qs.size();
}
}
}
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