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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-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.rxjava3.internal.operators.flowable;
import org.reactivestreams.*;
import io.reactivex.rxjava3.core.Flowable;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.*;
import io.reactivex.rxjava3.internal.subscriptions.*;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
import java.util.Objects;
/**
* Utility classes to work with scalar-sourced XMap operators (where X == { flat, concat, switch }).
*/
public final class FlowableScalarXMap {
/** Utility class. */
private FlowableScalarXMap() {
throw new IllegalStateException("No instances!");
}
/**
* Tries to subscribe to a possibly Supplier source's mapped Publisher.
* @param the input value type
* @param the output value type
* @param source the source Publisher
* @param subscriber the subscriber
* @param mapper the function mapping a scalar value into a Publisher
* @return true if successful, false if the caller should continue with the regular path.
*/
@SuppressWarnings("unchecked")
public static boolean tryScalarXMapSubscribe(Publisher source,
Subscriber super R> subscriber,
Function super T, ? extends Publisher extends R>> mapper) {
if (source instanceof Supplier) {
T t;
try {
t = ((Supplier)source).get();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
EmptySubscription.error(ex, subscriber);
return true;
}
if (t == null) {
EmptySubscription.complete(subscriber);
return true;
}
Publisher extends R> r;
try {
r = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null Publisher");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
EmptySubscription.error(ex, subscriber);
return true;
}
if (r instanceof Supplier) {
R u;
try {
u = ((Supplier)r).get();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
EmptySubscription.error(ex, subscriber);
return true;
}
if (u == null) {
EmptySubscription.complete(subscriber);
return true;
}
subscriber.onSubscribe(new ScalarSubscription<>(subscriber, u));
} else {
r.subscribe(subscriber);
}
return true;
}
return false;
}
/**
* Maps a scalar value into a Publisher and emits its values.
*
* @param the scalar value type
* @param the output value type
* @param value the scalar value to map
* @param mapper the function that gets the scalar value and should return
* a Publisher that gets streamed
* @return the new Flowable instance
*/
public static Flowable scalarXMap(final T value, final Function super T, ? extends Publisher extends U>> mapper) {
return RxJavaPlugins.onAssembly(new ScalarXMapFlowable<>(value, mapper));
}
/**
* Maps a scalar value to a Publisher and subscribes to it.
*
* @param the scalar value type
* @param the mapped Publisher's element type.
*/
static final class ScalarXMapFlowable extends Flowable {
final T value;
final Function super T, ? extends Publisher extends R>> mapper;
ScalarXMapFlowable(T value,
Function super T, ? extends Publisher extends R>> mapper) {
this.value = value;
this.mapper = mapper;
}
@SuppressWarnings("unchecked")
@Override
public void subscribeActual(Subscriber super R> s) {
Publisher extends R> other;
try {
other = Objects.requireNonNull(mapper.apply(value), "The mapper returned a null Publisher");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
EmptySubscription.error(e, s);
return;
}
if (other instanceof Supplier) {
R u;
try {
u = ((Supplier)other).get();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
EmptySubscription.error(ex, s);
return;
}
if (u == null) {
EmptySubscription.complete(s);
return;
}
s.onSubscribe(new ScalarSubscription<>(s, u));
} else {
other.subscribe(s);
}
}
}
}
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