spring-data-redis RedisHyperLogLogCommands 源码
spring-data-redis RedisHyperLogLogCommands 代码
文件路径：/src/main/java/org/springframework/data/redis/connection/RedisHyperLogLogCommands.java
/*
* Copyright 2014-2022 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.connection;
import org.springframework.lang.Nullable;
/**
* {@literal HyperLogLog} specific commands supported by Redis.
*
* @author Christoph Strobl
* @author Mark Paluch
* @since 1.5
*/
public interface RedisHyperLogLogCommands {
/**
* Adds given {@literal values} to the HyperLogLog stored at given {@literal key}.
*
* @param key must not be {@literal null}.
* @param values must not be {@literal null}.
* @return {@literal null} when used in pipeline / transaction.
* @see <a href="https://redis.io/commands/pfadd">Redis Documentation: PFADD</a>
*/
@Nullable
Long pfAdd(byte[] key, byte[]... values);
/**
* Return the approximated cardinality of the structures observed by the HyperLogLog at {@literal key(s)}.
*
* @param keys must not be {@literal null}.
* @return {@literal null} when used in pipeline / transaction.
* @see <a href="https://redis.io/commands/pfcount">Redis Documentation: PFCOUNT</a>
*/
@Nullable
Long pfCount(byte[]... keys);
/**
* Merge N different HyperLogLogs at {@literal sourceKeys} into a single {@literal destinationKey}.
*
* @param destinationKey must not be {@literal null}.
* @param sourceKeys must not be {@literal null}.
* @see <a href="https://redis.io/commands/pfmerge">Redis Documentation: PFMERGE</a>
*/
void pfMerge(byte[] destinationKey, byte[]... sourceKeys);
}
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