spring-data-redis RedisMap 源码

  • 2022-08-16
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spring-data-redis RedisMap 代码

文件路径:/src/main/java/org/springframework/data/redis/support/collections/RedisMap.java

/*
 * Copyright 2011-2022 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
 *
 *      https://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.support.collections;

import java.util.Iterator;
import java.util.Map;
import java.util.concurrent.ConcurrentMap;

import org.springframework.lang.Nullable;

/**
 * Map view of a Redis hash.
 *
 * @author Costin Leau
 * @author Christoph Strobl
 */
public interface RedisMap<K, V> extends RedisStore, ConcurrentMap<K, V> {

	/**
	 * Increment {@code value} of the hash {@code key} by the given {@code delta}.
	 *
	 * @param key must not be {@literal null}.
	 * @param delta
	 * @return {@literal null} if hash does not exist.
	 * @since 1.0
	 */
	Long increment(K key, long delta);

	/**
	 * Increment {@code value} of the hash {@code key} by the given {@code delta}.
	 *
	 * @param key must not be {@literal null}.
	 * @param delta
	 * @return {@literal null} if hash does not exist.
	 * @since 1.1
	 */
	Double increment(K key, double delta);

	/**
	 * Get a random key from the hash.
	 *
	 * @return {@literal null} if the hash does not exist.
	 * @since 2.6
	 */
	K randomKey();

	/**
	 * Get a random entry from the hash.
	 *
	 * @return {@literal null} if the hash does not exist.
	 * @since 2.6
	 */
	@Nullable
	Map.Entry<K,V> randomEntry();

	/**
	 * @since 1.4
	 * @return
	 */
	Iterator<Map.Entry<K, V>> scan();
}

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