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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.BiFunction;
import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.core.Fuseable.ConditionalSubscriber;
import reactor.util.annotation.Nullable;
import reactor.util.function.Tuple2;
/**
* An operator that tags the values it passes through with their index in the original
* sequence as their natural long index (0-based) and maps it to a container type
* by way of a user-provided {@link BiFunction}. Usually the container type would be
* a {@link Tuple2}, t1 value being the index (as mapped by the user function) and t2 the
* source value, but this is entirely up to the user function to decide.
*
* @author Simon Baslé
*/
final class FluxIndex extends InternalFluxOperator {
private final BiFunction indexMapper;
FluxIndex(Flux source,
BiFunction indexMapper) {
super(source);
this.indexMapper = NullSafeIndexMapper.create(Objects.requireNonNull(indexMapper,
"indexMapper must be non null"));
}
@Override
public CoreSubscriber subscribeOrReturn(CoreSubscriber actual) {
if (actual instanceof ConditionalSubscriber) {
@SuppressWarnings("unchecked") ConditionalSubscriber cs =
(ConditionalSubscriber) actual;
return new IndexConditionalSubscriber<>(cs, indexMapper);
}
else {
return new IndexSubscriber<>(actual, indexMapper);
}
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return super.scanUnsafe(key);
}
static final class IndexSubscriber implements InnerOperator {
final CoreSubscriber actual;
final BiFunction indexMapper;
boolean done;
Subscription s;
long index = 0;
IndexSubscriber(CoreSubscriber actual,
BiFunction indexMapper) {
this.actual = actual;
this.indexMapper = indexMapper;
}
@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, actual.currentContext());
return;
}
long i = this.index;
try {
I typedIndex = indexMapper.apply(i, t);
this.index = i + 1L;
actual.onNext(typedIndex);
}
catch (Throwable e) {
onError(Operators.onOperatorError(s, e, t, actual.currentContext()));
}
}
@Override
public void onError(Throwable t) {
if (done) {
Operators.onErrorDropped(t, actual.currentContext());
return;
}
done = true;
actual.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
actual.onComplete();
}
@Override
public CoreSubscriber actual() {
return this.actual;
}
@Override
public void request(long n) {
s.request(n);
}
@Override
public void cancel() {
s.cancel();
}
@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 IndexConditionalSubscriber implements InnerOperator,
ConditionalSubscriber {
final ConditionalSubscriber actual;
final BiFunction indexMapper;
Subscription s;
boolean done;
long index;
IndexConditionalSubscriber(
ConditionalSubscriber cs,
BiFunction indexMapper) {
this.actual = cs;
this.indexMapper = indexMapper;
}
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.s, s)) {
this.s = s;
actual.onSubscribe(this);
}
}
@Override
public boolean tryOnNext(T t) {
if (done) {
Operators.onNextDropped(t, actual.currentContext());
return true;
}
I typedIndex;
long i = this.index;
try {
typedIndex = indexMapper.apply(i, t);
this.index = i + 1L;
}
catch (Throwable e) {
onError(Operators.onOperatorError(s, e, t, actual.currentContext()));
return true;
}
return actual.tryOnNext(typedIndex);
}
@Override
public void onNext(T t) {
if (done) {
Operators.onNextDropped(t, actual.currentContext());
return;
}
long i = this.index;
try {
I typedIndex = indexMapper.apply(i, t);
this.index = i + 1L;
actual.onNext(typedIndex);
}
catch (Throwable e) {
onError(Operators.onOperatorError(s, e, t, actual.currentContext()));
}
}
@Override
public void onError(Throwable throwable) {
if (done) {
Operators.onErrorDropped(throwable, actual.currentContext());
return;
}
done = true;
actual.onError(throwable);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
actual.onComplete();
}
@Override
public CoreSubscriber actual() {
return this.actual;
}
@Override
public void request(long n) {
s.request(n);
}
@Override
public void cancel() {
s.cancel();
}
@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 class NullSafeIndexMapper implements BiFunction {
private final BiFunction indexMapper;
private NullSafeIndexMapper(BiFunction indexMapper) {
this.indexMapper = indexMapper;
}
@Override
public I apply(Long i, T t) {
I typedIndex = indexMapper.apply(i, t);
if (typedIndex == null) {
throw new NullPointerException("indexMapper returned a null value" +
" at raw index " + i + " for value " + t);
}
return typedIndex;
}
static BiFunction create(
BiFunction indexMapper) {
if (indexMapper == Flux.TUPLE2_BIFUNCTION) {
// TUPLE2_BIFUNCTION (Tuples::of) never returns null.
// Also helps FluxIndexFuseable to detect the default index mapper.
return indexMapper;
}
return new NullSafeIndexMapper<>(indexMapper);
}
}
}
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