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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
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/*
* 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.concurrent.atomic.AtomicLong;
import org.reactivestreams.*;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.internal.subscriptions.*;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
public final class FlowableTake extends AbstractFlowableWithUpstream {
final long n;
public FlowableTake(Flowable source, long n) {
super(source);
this.n = n;
}
@Override
protected void subscribeActual(Subscriber super T> s) {
source.subscribe(new TakeSubscriber<>(s, n));
}
static final class TakeSubscriber
extends AtomicLong
implements FlowableSubscriber, Subscription {
private static final long serialVersionUID = 2288246011222124525L;
final Subscriber super T> downstream;
long remaining;
Subscription upstream;
TakeSubscriber(Subscriber super T> actual, long remaining) {
this.downstream = actual;
this.remaining = remaining;
lazySet(remaining);
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.upstream, s)) {
if (remaining == 0L) {
s.cancel();
EmptySubscription.complete(downstream);
} else {
this.upstream = s;
downstream.onSubscribe(this);
}
}
}
@Override
public void onNext(T t) {
long r = remaining;
if (r > 0L) {
remaining = --r;
downstream.onNext(t);
if (r == 0L) {
upstream.cancel();
downstream.onComplete();
}
}
}
@Override
public void onError(Throwable t) {
if (remaining > 0L) {
remaining = 0L;
downstream.onError(t);
} else {
RxJavaPlugins.onError(t);
}
}
@Override
public void onComplete() {
if (remaining > 0L) {
remaining = 0L;
downstream.onComplete();
}
}
@Override
public void request(long n) {
if (SubscriptionHelper.validate(n)) {
for (;;) {
long r = get();
if (r == 0L) {
break;
}
long toRequest = Math.min(r, n);
long u = r - toRequest;
if (compareAndSet(r, u)) {
upstream.request(toRequest);
break;
}
}
}
}
@Override
public void cancel() {
upstream.cancel();
}
}
}
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