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/*
 * Copyright 2017-2018 the original author or authors.
 *
 * 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.springframework.data.redis.core;

import reactor.core.publisher.Mono;

import java.time.Duration;
import java.util.Collection;
import java.util.List;
import java.util.Map;

import org.springframework.data.redis.connection.BitFieldSubCommands;

/**
 * Reactive Redis operations for simple (or in Redis terminology 'string') values.
 *
 * @author Mark Paluch
 * @author Jiahe Cai
 * @since 2.0
 */
public interface ReactiveValueOperations {

	/**
	 * Set {@code value} for {@code key}.
	 *
	 * @param key must not be {@literal null}.
	 * @param value
	 * @see Redis Documentation: SET
	 */
	Mono set(K key, V value);

	/**
	 * Set the {@code value} and expiration {@code timeout} for {@code key}.
	 *
	 * @param key must not be {@literal null}.
	 * @param value
	 * @param timeout must not be {@literal null}.
	 * @see Redis Documentation: SETEX
	 */
	Mono set(K key, V value, Duration timeout);

	/**
	 * Set {@code key} to hold the string {@code value} if {@code key} is absent.
	 *
	 * @param key must not be {@literal null}.
	 * @param value
	 * @see Redis Documentation: SETNX
	 */
	Mono setIfAbsent(K key, V value);

	/**
	 * Set {@code key} to hold the string {@code value} and expiration {@code timeout} if {@code key} is absent.
	 *
	 * @param key must not be {@literal null}.
	 * @param value
	 * @param timeout must not be {@literal null}.
	 * @since 2.1
	 * @see Redis Documentation: SET
	 */
	Mono setIfAbsent(K key, V value, Duration timeout);

	/**
	 * Set {@code key} to hold the string {@code value} if {@code key} is present.
	 *
	 * @param key must not be {@literal null}.
	 * @param value
	 * @see Redis Documentation: SET
	 */
	Mono setIfPresent(K key, V value);

	/**
	 * Set {@code key} to hold the string {@code value} and expiration {@code timeout} if {@code key} is present.
	 *
	 * @param key must not be {@literal null}.
	 * @param value
	 * @param timeout must not be {@literal null}.
	 * @since 2.1
	 * @see Redis Documentation: SET
	 */
	Mono setIfPresent(K key, V value, Duration timeout);

	/**
	 * Set multiple keys to multiple values using key-value pairs provided in {@code tuple}.
	 *
	 * @param map must not be {@literal null}.
	 * @see Redis Documentation: MSET
	 */
	Mono multiSet(Map map);

	/**
	 * Set multiple keys to multiple values using key-value pairs provided in {@code tuple} only if the provided key does
	 * not exist.
	 *
	 * @param map must not be {@literal null}.
	 * @see Redis Documentation: MSETNX
	 */
	Mono multiSetIfAbsent(Map map);

	/**
	 * Get the value of {@code key}.
	 *
	 * @param key must not be {@literal null}.
	 * @see Redis Documentation: GET
	 */
	Mono get(Object key);

	/**
	 * Set {@code value} of {@code key} and return its old value.
	 *
	 * @param key must not be {@literal null}.
	 * @see Redis Documentation: GETSET
	 */
	Mono getAndSet(K key, V value);

	/**
	 * Get multiple {@code keys}. Values are returned in the order of the requested keys.
	 *
	 * @param keys must not be {@literal null}.
	 * @see Redis Documentation: MGET
	 */
	Mono> multiGet(Collection keys);

	/**
	 * Increments the number stored at {@code key} by one.
	 *
	 * @param key must not be {@literal null}.
	 * @since 2.1
	 * @see Redis Documentation: INCR
	 */
	Mono increment(K key);

	/**
	 * Increments the number stored at {@code key} by {@code delta}.
	 *
	 * @param key must not be {@literal null}.
	 * @param delta
	 * @since 2.1
	 * @see Redis Documentation: INCRBY
	 */
	Mono increment(K key, long delta);

	/**
	 * Increment the string representing a floating point number stored at {@code key} by {@code delta}.
	 *
	 * @param key must not be {@literal null}.
	 * @param delta
	 * @since 2.1
	 * @see Redis Documentation: INCRBYFLOAT
	 */
	Mono increment(K key, double delta);

	/**
	 * Decrements the number stored at {@code key} by one.
	 *
	 * @param key must not be {@literal null}.
	 * @since 2.1
	 * @see Redis Documentation: DECR
	 */
	Mono decrement(K key);

	/**
	 * Decrements the number stored at {@code key} by {@code delta}.
	 *
	 * @param key must not be {@literal null}.
	 * @param delta
	 * @since 2.1
	 * @see Redis Documentation: DECRBY
	 */
	Mono decrement(K key, long delta);

	/**
	 * Append a {@code value} to {@code key}.
	 *
	 * @param key must not be {@literal null}.
	 * @param value
	 * @see Redis Documentation: APPEND
	 */
	Mono append(K key, String value);

	/**
	 * Get a substring of value of {@code key} between {@code begin} and {@code end}.
	 *
	 * @param key must not be {@literal null}.
	 * @param start
	 * @param end
	 * @see Redis Documentation: GETRANGE
	 */
	Mono get(K key, long start, long end);

	/**
	 * Overwrite parts of {@code key} starting at the specified {@code offset} with given {@code value}.
	 *
	 * @param key must not be {@literal null}.
	 * @param value
	 * @param offset
	 * @see Redis Documentation: SETRANGE
	 */
	Mono set(K key, V value, long offset);

	/**
	 * Get the length of the value stored at {@code key}.
	 *
	 * @param key must not be {@literal null}.
	 * @see Redis Documentation: STRLEN
	 */
	Mono size(K key);

	/**
	 * Sets the bit at {@code offset} in value stored at {@code key}.
	 *
	 * @param key must not be {@literal null}.
	 * @param offset
	 * @param value
	 * @see Redis Documentation: SETBIT
	 */
	Mono setBit(K key, long offset, boolean value);

	/**
	 * « Get the bit value at {@code offset} of value at {@code key}.
	 *
	 * @param key must not be {@literal null}.
	 * @param offset
	 * @see Redis Documentation: GETBIT
	 */
	Mono getBit(K key, long offset);

	/**
	 * Get / Manipulate specific integer fields of varying bit widths and arbitrary non (necessary) aligned offset stored
	 * at a given {@code key}.
	 *
	 * @param key must not be {@literal null}.
	 * @param command must not be {@literal null}.
	 * @return
	 * @since 2.1
	 */
	Mono> bitField(K key, BitFieldSubCommands command);

	/**
	 * Removes the given {@literal key}.
	 *
	 * @param key must not be {@literal null}.
	 */
	Mono delete(K key);
}




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