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org.redisson.RedissonDeque Maven / Gradle / Ivy
/**
* 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.RDeque;
import org.redisson.api.RFuture;
import org.redisson.api.RedissonClient;
import org.redisson.api.queue.DequeMoveArgs;
import org.redisson.api.queue.DequeMoveParams;
import org.redisson.client.codec.Codec;
import org.redisson.client.protocol.RedisCommand;
import org.redisson.client.protocol.RedisCommands;
import org.redisson.client.protocol.decoder.ListFirstObjectDecoder;
import org.redisson.command.CommandAsyncExecutor;
import java.util.*;
/**
* Distributed and concurrent implementation of {@link java.util.Queue}
*
* @author Nikita Koksharov
*
* @param the type of elements held in this collection
*/
public class RedissonDeque extends RedissonQueue implements RDeque {
private static final RedisCommand LRANGE_SINGLE = new RedisCommand("LRANGE", new ListFirstObjectDecoder());
public RedissonDeque(CommandAsyncExecutor commandExecutor, String name, RedissonClient redisson) {
super(commandExecutor, name, redisson);
}
public RedissonDeque(Codec codec, CommandAsyncExecutor commandExecutor, String name, RedissonClient redisson) {
super(codec, commandExecutor, name, redisson);
}
@Override
public int addFirstIfExists(V... elements) {
return get(addFirstIfExistsAsync(elements));
}
@Override
public int addLastIfExists(V... elements) {
return get(addLastIfExistsAsync(elements));
}
@Override
public int addFirst(V... elements) {
return get(addFirstAsync(elements));
}
@Override
public int addLast(V... elements) {
return get(addLastAsync(elements));
}
@Override
public RFuture addFirstAsync(V... elements) {
List args = new ArrayList<>(elements.length + 1);
args.add(getRawName());
encode(args, Arrays.asList(elements));
return commandExecutor.writeAsync(getRawName(), codec, RedisCommands.LPUSH, args.toArray());
}
@Override
public RFuture addLastAsync(V... elements) {
List args = new ArrayList<>(elements.length + 1);
args.add(getRawName());
encode(args, Arrays.asList(elements));
return commandExecutor.writeAsync(getRawName(), codec, RedisCommands.RPUSH, args.toArray());
}
@Override
public RFuture addFirstIfExistsAsync(V... elements) {
List args = new ArrayList<>(elements.length + 1);
args.add(getRawName());
encode(args, Arrays.asList(elements));
return commandExecutor.writeAsync(getRawName(), codec, RedisCommands.LPUSHX, args.toArray());
}
@Override
public RFuture addLastIfExistsAsync(V... elements) {
List args = new ArrayList<>(elements.length + 1);
args.add(getRawName());
encode(args, Arrays.asList(elements));
return commandExecutor.writeAsync(getRawName(), codec, RedisCommands.RPUSHX, args.toArray());
}
@Override
public void addFirst(V e) {
get(addFirstAsync(e));
}
@Override
public RFuture addFirstAsync(V e) {
return commandExecutor.writeAsync(getRawName(), codec, RedisCommands.LPUSH_VOID, getRawName(), encode(e));
}
@Override
public void addLast(V e) {
get(addLastAsync(e));
}
@Override
public RFuture addLastAsync(V e) {
return commandExecutor.writeAsync(getRawName(), codec, RedisCommands.RPUSH_VOID, getRawName(), encode(e));
}
@Override
public V move(DequeMoveArgs args) {
return get(moveAsync(args));
}
@Override
public RFuture moveAsync(DequeMoveArgs args) {
DequeMoveParams pp = (DequeMoveParams) args;
return commandExecutor.writeAsync(getRawName(), codec, RedisCommands.LMOVE, getRawName(),
pp.getDestName(), pp.getSourceDirection(), pp.getDestDirection());
}
@Override
public Iterator descendingIterator() {
return new Iterator() {
private int currentIndex = size();
private boolean removeExecuted;
@Override
public boolean hasNext() {
int size = size();
return currentIndex > 0 && size > 0;
}
@Override
public V next() {
if (!hasNext()) {
throw new NoSuchElementException("No such element at index " + currentIndex);
}
currentIndex--;
removeExecuted = false;
return RedissonDeque.this.get(currentIndex);
}
@Override
public void remove() {
if (removeExecuted) {
throw new IllegalStateException("Element been already deleted");
}
RedissonDeque.this.remove(currentIndex);
currentIndex++;
removeExecuted = true;
}
};
}
@Override
public RFuture getLastAsync() {
return commandExecutor.readAsync(getRawName(), codec, LRANGE_SINGLE, getRawName(), -1, -1);
}
@Override
public V getLast() {
V result = get(getLastAsync());
if (result == null) {
throw new NoSuchElementException();
}
return result;
}
@Override
public boolean offerFirst(V e) {
return get(offerFirstAsync(e));
}
@Override
public RFuture offerFirstAsync(V e) {
return commandExecutor.writeAsync(getRawName(), codec, RedisCommands.LPUSH_BOOLEAN, getRawName(), encode(e));
}
@Override
public RFuture offerLastAsync(V e) {
return offerAsync(e);
}
@Override
public boolean offerLast(V e) {
return get(offerLastAsync(e));
}
@Override
public RFuture peekFirstAsync() {
return getAsync(0);
}
@Override
public V peekFirst() {
return get(peekFirstAsync());
}
@Override
public RFuture peekLastAsync() {
return getLastAsync();
}
@Override
public V peekLast() {
return get(getLastAsync());
}
@Override
public RFuture pollFirstAsync() {
return pollAsync();
}
@Override
public V pollFirst() {
return poll();
}
@Override
public RFuture> pollFirstAsync(int limit) {
return pollAsync(limit);
}
@Override
public List pollFirst(int limit) {
return poll(limit);
}
@Override
public RFuture pollLastAsync() {
return commandExecutor.writeAsync(getRawName(), codec, RedisCommands.RPOP, getRawName());
}
@Override
public List pollLast(int limit) {
return get(pollLastAsync(limit));
}
@Override
public RFuture> pollLastAsync(int limit) {
return commandExecutor.evalWriteNoRetryAsync(getRawName(), codec, RedisCommands.EVAL_LIST,
"local result = {};"
+ "for i = 1, ARGV[1], 1 do " +
"local value = redis.call('rpop', KEYS[1]);" +
"if value ~= false then " +
"table.insert(result, value);" +
"else " +
"return result;" +
"end;" +
"end; " +
"return result;",
Collections.singletonList(getRawName()), limit);
}
@Override
public V pollLast() {
return get(pollLastAsync());
}
@Override
public RFuture popAsync() {
return pollAsync();
}
@Override
public V pop() {
return removeFirst();
}
@Override
public RFuture pushAsync(V e) {
return addFirstAsync(e);
}
@Override
public void push(V e) {
addFirst(e);
}
@Override
public RFuture removeFirstOccurrenceAsync(Object o) {
return removeAsync(o, 1);
}
@Override
public boolean removeFirstOccurrence(Object o) {
return remove(o, 1);
}
@Override
public RFuture removeFirstAsync() {
return pollAsync();
}
@Override
public RFuture removeLastAsync() {
return commandExecutor.writeAsync(getRawName(), codec, RedisCommands.RPOP, getRawName());
}
@Override
public V removeLast() {
V value = get(removeLastAsync());
if (value == null) {
throw new NoSuchElementException();
}
return value;
}
@Override
public RFuture removeLastOccurrenceAsync(Object o) {
return removeAsync(o, -1);
}
@Override
public boolean removeLastOccurrence(Object o) {
return remove(o, -1);
}
}
