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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;

import org.redisson.api.Entry;
import org.redisson.api.RFuture;
import org.redisson.api.RPriorityBlockingQueue;
import org.redisson.api.RedissonClient;
import org.redisson.client.RedisConnectionException;
import org.redisson.client.codec.Codec;
import org.redisson.client.protocol.RedisCommand;
import org.redisson.client.protocol.RedisCommands;
import org.redisson.command.CommandAsyncExecutor;
import org.redisson.connection.decoder.ListDrainToDecoder;
import org.redisson.misc.CompletableFutureWrapper;

import java.time.Duration;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import java.util.function.Consumer;
import java.util.function.Function;

/**
 * 

Distributed and concurrent implementation of {@link java.util.concurrent.PriorityBlockingQueue}. * *

Queue size limited by Redis server memory amount. This is why {@link #remainingCapacity()} always * returns Integer.MAX_VALUE * * @author Nikita Koksharov */ public class RedissonPriorityBlockingQueue extends RedissonPriorityQueue implements RPriorityBlockingQueue { protected RedissonPriorityBlockingQueue(CommandAsyncExecutor commandExecutor, String name, RedissonClient redisson) { super(commandExecutor, name, redisson); } protected RedissonPriorityBlockingQueue(Codec codec, CommandAsyncExecutor commandExecutor, String name, RedissonClient redisson) { super(codec, commandExecutor, name, redisson); } @Override public void put(V e) throws InterruptedException { add(e); } @Override public boolean offer(V e, long timeout, TimeUnit unit) throws InterruptedException { return offer(e); } @Override public RFuture takeAsync() { CompletableFuture result = new CompletableFuture(); takeAsync(result, 0, 0, RedisCommands.LPOP, getRawName()); return new CompletableFutureWrapper<>(result); } protected void takeAsync(CompletableFuture result, long delay, long timeoutInMicro, RedisCommand command, Object... params) { long start = System.currentTimeMillis(); getServiceManager().newTimeout(t -> { RFuture future = wrapLockedAsync(command, params); future.whenComplete((res, e) -> { if (e != null && !(e instanceof RedisConnectionException)) { result.completeExceptionally(e); return; } if (res != null) { result.complete(res); return; } if (result.isCancelled()) { return; } long remain = 0; if (timeoutInMicro > 0) { remain = timeoutInMicro - ((System.currentTimeMillis() - start))*1000; if (remain <= 0) { result.complete(null); return; } } long del = ThreadLocalRandom.current().nextInt(2000000); if (timeoutInMicro > 0 && remain < 2000000) { del = 0; } takeAsync(result, del, remain, command, params); }); }, delay, TimeUnit.MICROSECONDS); } @Override public V take() throws InterruptedException { return commandExecutor.getInterrupted(takeAsync()); } public RFuture pollAsync(long timeout, TimeUnit unit) { CompletableFuture result = new CompletableFuture(); takeAsync(result, 0, unit.toMicros(timeout), RedisCommands.LPOP, getRawName()); return new CompletableFutureWrapper<>(result); } @Override public V poll(long timeout, TimeUnit unit) throws InterruptedException { return commandExecutor.getInterrupted(pollAsync(timeout, unit)); } @Override public V pollFromAny(long timeout, TimeUnit unit, String... queueNames) throws InterruptedException { throw new UnsupportedOperationException("use poll method"); } @Override public Entry pollFromAnyWithName(Duration timeout, String... queueNames) throws InterruptedException { throw new UnsupportedOperationException("use poll method"); } @Override public Map> pollFirstFromAny(Duration duration, int count, String... queueNames) throws InterruptedException { throw new UnsupportedOperationException("use poll method"); } @Override public Map> pollLastFromAny(Duration duration, int count, String... queueNames) throws InterruptedException { throw new UnsupportedOperationException("use poll method"); } @Override public RFuture>> pollFirstFromAnyAsync(Duration duration, int count, String... queueNames) { throw new UnsupportedOperationException("use poll method"); } @Override public RFuture>> pollLastFromAnyAsync(Duration duration, int count, String... queueNames) { throw new UnsupportedOperationException("use poll method"); } @Override public RFuture pollLastAndOfferFirstToAsync(String queueName, long timeout, TimeUnit unit) { CompletableFuture result = new CompletableFuture(); takeAsync(result, 0, unit.toMicros(timeout), RedisCommands.RPOPLPUSH, getRawName(), queueName); return new CompletableFutureWrapper<>(result); } @Override public V pollLastAndOfferFirstTo(String queueName, long timeout, TimeUnit unit) throws InterruptedException { return commandExecutor.getInterrupted(pollLastAndOfferFirstToAsync(queueName, timeout, unit)); } @Override public V takeLastAndOfferFirstTo(String queueName) throws InterruptedException { return commandExecutor.getInterrupted(takeLastAndOfferFirstToAsync(queueName)); } @Override public int subscribeOnElements(Consumer consumer) { return getServiceManager().getElementsSubscribeService() .subscribeOnElements(this::takeAsync, consumer); } @Override public int subscribeOnElements(Function> consumer) { return getServiceManager().getElementsSubscribeService() .subscribeOnElements(this::takeAsync, consumer); } @Override public void unsubscribe(int listenerId) { getServiceManager().getElementsSubscribeService().unsubscribe(listenerId); } public RFuture takeLastAndOfferFirstToAsync(String queueName) { return pollLastAndOfferFirstToAsync(queueName, 0, TimeUnit.SECONDS); } @Override public int remainingCapacity() { return Integer.MAX_VALUE; } @Override public int drainTo(Collection c) { lock.lock(); try { return get(drainToAsync(c)); } finally { lock.unlock(); } } public RFuture drainToAsync(Collection c) { if (c == null) { throw new NullPointerException(); } return commandExecutor.evalWriteAsync(getRawName(), codec, new RedisCommand("EVAL", new ListDrainToDecoder(c)), "local vals = redis.call('lrange', KEYS[1], 0, -1); " + "redis.call('ltrim', KEYS[1], -1, 0); " + "return vals", Collections.singletonList(getRawName())); } @Override public int drainTo(Collection c, int maxElements) { if (maxElements <= 0) { return 0; } lock.lock(); try { return get(drainToAsync(c, maxElements)); } finally { lock.unlock(); } } public RFuture drainToAsync(Collection c, int maxElements) { if (c == null) { throw new NullPointerException(); } return commandExecutor.evalWriteAsync(getRawName(), codec, new RedisCommand("EVAL", new ListDrainToDecoder(c)), "local elemNum = math.min(ARGV[1], redis.call('llen', KEYS[1])) - 1;" + "local vals = redis.call('lrange', KEYS[1], 0, elemNum); " + "redis.call('ltrim', KEYS[1], elemNum + 1, -1); " + "return vals", Collections.singletonList(getRawName()), maxElements); } @Override public RFuture offerAsync(V e) { throw new UnsupportedOperationException("use offer method"); } @Override public RFuture> pollAsync(int limit) { return wrapLockedAsync(() -> { return commandExecutor.evalWriteNoRetryAsync(getRawName(), codec, RedisCommands.EVAL_LIST, "local result = {};" + "for i = 1, ARGV[1], 1 do " + "local value = redis.call('lpop', KEYS[1]);" + "if value ~= false then " + "table.insert(result, value);" + "else " + "return result;" + "end;" + "end; " + "return result;", Collections.singletonList(getRawName()), limit); }); } @Override public RFuture pollFromAnyAsync(long timeout, TimeUnit unit, String... queueNames) { throw new UnsupportedOperationException("use poll method"); } @Override public RFuture> pollFromAnyWithNameAsync(Duration timeout, String... queueNames) { throw new UnsupportedOperationException("use poll method"); } @Override public RFuture putAsync(V e) { throw new UnsupportedOperationException("use add method"); } @Override public List poll(int limit) { return get(pollAsync(limit)); } }