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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 java.util.Objects;
import java.util.concurrent.atomic.AtomicBoolean;
import org.reactivestreams.*;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.exceptions.*;
import io.reactivex.rxjava3.functions.*;
import io.reactivex.rxjava3.internal.subscriptions.*;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
public final class FlowableUsing extends Flowable {
final Supplier extends D> resourceSupplier;
final Function super D, ? extends Publisher extends T>> sourceSupplier;
final Consumer super D> disposer;
final boolean eager;
public FlowableUsing(Supplier extends D> resourceSupplier,
Function super D, ? extends Publisher extends T>> sourceSupplier,
Consumer super D> disposer,
boolean eager) {
this.resourceSupplier = resourceSupplier;
this.sourceSupplier = sourceSupplier;
this.disposer = disposer;
this.eager = eager;
}
@Override
public void subscribeActual(Subscriber super T> s) {
D resource;
try {
resource = resourceSupplier.get();
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
EmptySubscription.error(e, s);
return;
}
Publisher extends T> source;
try {
source = Objects.requireNonNull(sourceSupplier.apply(resource), "The sourceSupplier returned a null Publisher");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
try {
disposer.accept(resource);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
EmptySubscription.error(new CompositeException(e, ex), s);
return;
}
EmptySubscription.error(e, s);
return;
}
UsingSubscriber us = new UsingSubscriber<>(s, resource, disposer, eager);
source.subscribe(us);
}
static final class UsingSubscriber extends AtomicBoolean implements FlowableSubscriber, Subscription {
private static final long serialVersionUID = 5904473792286235046L;
final Subscriber super T> downstream;
final D resource;
final Consumer super D> disposer;
final boolean eager;
Subscription upstream;
UsingSubscriber(Subscriber super T> actual, D resource, Consumer super D> disposer, boolean eager) {
this.downstream = actual;
this.resource = resource;
this.disposer = disposer;
this.eager = eager;
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.upstream, s)) {
this.upstream = s;
downstream.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
downstream.onNext(t);
}
@Override
public void onError(Throwable t) {
if (eager) {
Throwable innerError = null;
if (compareAndSet(false, true)) {
try {
disposer.accept(resource);
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
innerError = e;
}
}
if (innerError != null) {
downstream.onError(new CompositeException(t, innerError));
} else {
downstream.onError(t);
}
} else {
downstream.onError(t);
disposeResource();
}
}
@Override
public void onComplete() {
if (eager) {
if (compareAndSet(false, true)) {
try {
disposer.accept(resource);
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
downstream.onError(e);
return;
}
}
downstream.onComplete();
} else {
downstream.onComplete();
disposeResource();
}
}
@Override
public void request(long n) {
upstream.request(n);
}
@Override
public void cancel() {
if (eager) {
disposeResource();
upstream.cancel();
upstream = SubscriptionHelper.CANCELLED;
} else {
upstream.cancel();
upstream = SubscriptionHelper.CANCELLED;
disposeResource();
}
}
void disposeResource() {
if (compareAndSet(false, true)) {
try {
disposer.accept(resource);
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
// can't call actual.onError unless it is serialized, which is expensive
RxJavaPlugins.onError(e);
}
}
}
}
}
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