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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.ArrayDeque;
import java.util.concurrent.atomic.*;
import org.reactivestreams.*;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
import io.reactivex.rxjava3.internal.util.BackpressureHelper;
public final class FlowableTakeLast extends AbstractFlowableWithUpstream {
final int count;
public FlowableTakeLast(Flowable source, int count) {
super(source);
this.count = count;
}
@Override
protected void subscribeActual(Subscriber super T> s) {
source.subscribe(new TakeLastSubscriber<>(s, count));
}
static final class TakeLastSubscriber extends ArrayDeque implements FlowableSubscriber, Subscription {
private static final long serialVersionUID = 7240042530241604978L;
final Subscriber super T> downstream;
final int count;
Subscription upstream;
volatile boolean done;
volatile boolean cancelled;
final AtomicLong requested = new AtomicLong();
final AtomicInteger wip = new AtomicInteger();
TakeLastSubscriber(Subscriber super T> actual, int count) {
this.downstream = actual;
this.count = count;
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.upstream, s)) {
this.upstream = s;
downstream.onSubscribe(this);
s.request(Long.MAX_VALUE);
}
}
@Override
public void onNext(T t) {
if (count == size()) {
poll();
}
offer(t);
}
@Override
public void onError(Throwable t) {
downstream.onError(t);
}
@Override
public void onComplete() {
done = true;
drain();
}
@Override
public void request(long n) {
if (SubscriptionHelper.validate(n)) {
BackpressureHelper.add(requested, n);
drain();
}
}
@Override
public void cancel() {
cancelled = true;
upstream.cancel();
}
void drain() {
if (wip.getAndIncrement() == 0) {
Subscriber super T> a = downstream;
long r = requested.get();
do {
if (cancelled) {
return;
}
if (done) {
long e = 0L;
while (e != r) {
if (cancelled) {
return;
}
T v = poll();
if (v == null) {
a.onComplete();
return;
}
a.onNext(v);
e++;
}
if (isEmpty()) {
a.onComplete();
return;
}
if (e != 0L) {
r = BackpressureHelper.produced(requested, e);
}
}
} while (wip.decrementAndGet() != 0);
}
}
}
}
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