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    • org.redisson.RedissonPriorityDeque Maven / Gradle / Ivy

    /**
 * Copyright (c) 2013-2021 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.RFuture;
import org.redisson.api.RPriorityDeque;
import org.redisson.api.RedissonClient;
import org.redisson.api.queue.DequeMoveArgs;
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.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.stream.Stream;

/**
 * Distributed and concurrent implementation of {@link java.util.Queue}
 *
 * @author Nikita Koksharov
 *
 * @param  the type of elements held in this collection
 */
public class RedissonPriorityDeque extends RedissonPriorityQueue implements RPriorityDeque {

    private static final RedisCommand LRANGE_SINGLE = new RedisCommand("LRANGE", new ListFirstObjectDecoder());


    protected RedissonPriorityDeque(CommandAsyncExecutor commandExecutor, String name, RedissonClient redisson) {
        super(commandExecutor, name, redisson);
    }

    public RedissonPriorityDeque(Codec codec, CommandAsyncExecutor commandExecutor, String name, RedissonClient redisson) {
        super(codec, commandExecutor, name, redisson);
    }

    @Override
    public int addFirstIfExists(V... elements) {
        throw new UnsupportedOperationException("use add or put method");
    }

    @Override
    public int addLastIfExists(V... elements) {
        throw new UnsupportedOperationException("use add or put method");
    }

    @Override
    public RFuture addFirstIfExistsAsync(V... elements) {
        throw new UnsupportedOperationException("use add or put method");
    }

    @Override
    public RFuture addLastIfExistsAsync(V... elements) {
        throw new UnsupportedOperationException("use add or put method");
    }

    @Override
    public RFuture addFirstAsync(V e) {
        throw new UnsupportedOperationException("use add or put method");
    }

    @Override
    public RFuture addLastAsync(V e) {
        throw new UnsupportedOperationException("use add or put method");
    }

    @Override
    public void addFirst(V e) {
        throw new UnsupportedOperationException("use add or put method");
    }

    @Override
    public void addLast(V e) {
        throw new UnsupportedOperationException("use add or put method");
    }

    @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 RedissonPriorityDeque.this.get(currentIndex);
            }

            @Override
            public void remove() {
                if (removeExecuted) {
                    throw new IllegalStateException("Element been already deleted");
                }
                RedissonPriorityDeque.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) {
        throw new UnsupportedOperationException("use add or put method");
    }

    public RFuture offerFirstAsync(V e) {
        throw new UnsupportedOperationException("use add or put method");
    }
    
    @Override
    public boolean offerLast(V e) {
        throw new UnsupportedOperationException("use add or put method");
    }

    public RFuture offerLastAsync(V e) {
        throw new UnsupportedOperationException("use add or put method");
    }
    
    @Override
    public RFuture peekFirstAsync() {
        return getAsync(0);
    }

    @Override
    public V peekFirst() {
        return get(peekFirstAsync());
    }

    @Override
    public V peekLast() {
        return get(peekLastAsync());
    }
    
    public RFuture peekLastAsync() {
        return getLastAsync();
    }

    @Override
    public V pollFirst() {
        return get(pollFirstAsync());
    }
    
    public RFuture pollFirstAsync() {
        return pollAsync();
    }

    public RFuture pollLastAsync() {
        return wrapLockedAsync(RedisCommands.RPOP, getRawName());
    }

    @Override
    public V pollLast() {
        return get(pollLastAsync());
    }

    @Override
    public RFuture popAsync() {
        return pollAsync();
    }

    @Override
    public V pop() {
        return removeFirst();
    }

    @Override
    public void push(V e) {
        throw new UnsupportedOperationException("use add or put method");
    }

    public RFuture pushAsync(V e) {
        throw new UnsupportedOperationException("use add or put method");
    }

    @Override
    public RFuture removeAsync(Object o, int count) {
        return wrapLockedAsync(() -> {
            return super.removeAsync(o, count);
        });
    }

    @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 pollLastAsync();
    }

    @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);
    }

    @Override
    public Stream descendingStream() {
        return toStream(descendingIterator());
    }

    @Override
    public RFuture> pollFirstAsync(int limit) {
        return pollAsync(limit);
    }

    @Override
    public List pollFirst(int limit) {
        return poll(limit);
    }

    @Override
    public List pollLast(int limit) {
        return get(pollLastAsync(limit));
    }

    @Override
    public RFuture> pollLastAsync(int limit) {
        return wrapLockedAsync(() -> {
            return commandExecutor.evalWriteAsync(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 move(DequeMoveArgs args) {
        throw new UnsupportedOperationException();
    }

    @Override
    public RFuture moveAsync(DequeMoveArgs args) {
        throw new UnsupportedOperationException();
    }
}
    
    
    
    

    




    
    
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