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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) 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.reactive;
import org.redisson.api.RFuture;
import reactor.core.publisher.Flux;
import reactor.core.publisher.FluxSink;
import java.util.concurrent.Callable;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
/**
*
* @author Nikita Koksharov
*
*/
public class ElementsStream {
private static void take(Callable> factory, FluxSink emitter, AtomicLong counter, AtomicReference> futureRef) {
RFuture future;
try {
future = factory.call();
} catch (Exception e) {
emitter.error(e);
return;
}
futureRef.set(future);
future.whenComplete((res, e) -> {
if (e != null) {
emitter.error(e);
return;
}
emitter.next(res);
if (counter.decrementAndGet() == 0) {
return;
}
take(factory, emitter, counter, futureRef);
});
}
public static Flux takeElements(Callable> callable) {
return Flux.create(emitter -> {
AtomicReference> futureRef = new AtomicReference>();
emitter.onRequest(n -> {
AtomicLong counter = new AtomicLong(n);
take(callable, emitter, counter, futureRef);
});
emitter.onDispose(() -> {
futureRef.get().cancel(true);
});
});
}
}
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