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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) 2013-2024 Nikita Koksharov
*
* 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 org.redisson.rx;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Supplier;
import org.redisson.api.RFuture;
import io.reactivex.rxjava3.core.Flowable;
import io.reactivex.rxjava3.functions.Action;
import io.reactivex.rxjava3.functions.LongConsumer;
import io.reactivex.rxjava3.processors.ReplayProcessor;
/**
*
* @author Nikita Koksharov
*
*/
public class ElementsStream {
public static Flowable takeElements(Supplier> callable) {
ReplayProcessor p = ReplayProcessor.create();
return p.doOnRequest(new LongConsumer() {
@Override
public void accept(long n) throws Exception {
AtomicLong counter = new AtomicLong(n);
AtomicReference> futureRef = new AtomicReference>();
take(callable, p, counter, futureRef);
p.doOnCancel(new Action() {
@Override
public void run() throws Exception {
futureRef.get().cancel(true);
}
});
}
});
}
private static void take(Supplier> factory, ReplayProcessor p, AtomicLong counter, AtomicReference> futureRef) {
RFuture future = factory.get();
futureRef.set(future);
future.whenComplete((res, e) -> {
if (e != null) {
p.onError(e);
return;
}
p.onNext(res);
if (counter.decrementAndGet() == 0) {
p.onComplete();
}
take(factory, p, counter, futureRef);
});
}
}
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