/*
* Copyright 2011-2017 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.connection;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.springframework.data.redis.core.Cursor;
import org.springframework.data.redis.core.ScanOptions;
/**
* Hash-specific commands supported by Redis.
*
* @author Costin Leau
* @author Christoph Strobl
* @author Mark Paluch
*/
public interface RedisHashCommands {
/**
* Set the {@code value} of a hash {@code field}.
*
* @param key must not be {@literal null}.
* @param field must not be {@literal null}.
* @param value
* @return
* @see <a href="http://redis.io/commands/hset">Redis Documentation: HSET</a>
*/
Boolean hSet(byte[] key, byte[] field, byte[] value);
/**
* Set the {@code value} of a hash {@code field} only if {@code field} does not exist.
*
* @param key must not be {@literal null}.
* @param field must not be {@literal null}.
* @param value
* @return
* @see <a href="http://redis.io/commands/hsetnx">Redis Documentation: HSETNX</a>
*/
Boolean hSetNX(byte[] key, byte[] field, byte[] value);
/**
* Get value for given {@code field} from hash at {@code key}.
*
* @param key must not be {@literal null}.
* @param field must not be {@literal null}.
* @return
* @see <a href="http://redis.io/commands/hget">Redis Documentation: HGET</a>
*/
byte[] hGet(byte[] key, byte[] field);
/**
* Get values for given {@code fields} from hash at {@code key}.
*
* @param key must not be {@literal null}.
* @param fields must not be {@literal null}.
* @return
* @see <a href="http://redis.io/commands/hmget">Redis Documentation: HMGET</a>
*/
List<byte[]> hMGet(byte[] key, byte[]... fields);
/**
* Set multiple hash fields to multiple values using data provided in {@code hashes}
*
* @param key must not be {@literal null}.
* @param hashes must not be {@literal null}.
* @see <a href="http://redis.io/commands/hmset">Redis Documentation: HMSET</a>
*/
void hMSet(byte[] key, Map<byte[], byte[]> hashes);
/**
* Increment {@code value} of a hash {@code field} by the given {@code delta}.
*
* @param key must not be {@literal null}.
* @param field must not be {@literal null}.
* @param delta
* @return
* @see <a href="http://redis.io/commands/hincrby">Redis Documentation: HINCRBY</a>
*/
Long hIncrBy(byte[] key, byte[] field, long delta);
/**
* Increment {@code value} of a hash {@code field} by the given {@code delta}.
*
* @param key must not be {@literal null}.
* @param field
* @param delta
* @return
* @see <a href="http://redis.io/commands/hincrbyfloat">Redis Documentation: HINCRBYFLOAT</a>
*/
Double hIncrBy(byte[] key, byte[] field, double delta);
/**
* Determine if given hash {@code field} exists.
*
* @param key must not be {@literal null}.
* @param field must not be {@literal null}.
* @return
* @see <a href="http://redis.io/commands/hexits">Redis Documentation: HEXISTS</a>
*/
Boolean hExists(byte[] key, byte[] field);
/**
* Delete given hash {@code fields}.
*
* @param key must not be {@literal null}.
* @param fields must not be {@literal null}.
* @return
* @see <a href="http://redis.io/commands/hdel">Redis Documentation: HDEL</a>
*/
Long hDel(byte[] key, byte[]... fields);
/**
* Get size of hash at {@code key}.
*
* @param key must not be {@literal null}.
* @return
* @see <a href="http://redis.io/commands/hlen">Redis Documentation: HLEN</a>
*/
Long hLen(byte[] key);
/**
* Get key set (fields) of hash at {@code key}.
*
* @param key must not be {@literal null}.
* @return
* @see <a href="http://redis.io/commands/hkeys">Redis Documentation: HKEYS</a>?
*/
Set<byte[]> hKeys(byte[] key);
/**
* Get entry set (values) of hash at {@code field}.
*
* @param key must not be {@literal null}.
* @return
* @see <a href="http://redis.io/commands/hvals">Redis Documentation: HVALS</a>
*/
List<byte[]> hVals(byte[] key);
/**
* Get entire hash stored at {@code key}.
*
* @param key must not be {@literal null}.
* @return
* @see <a href="http://redis.io/commands/hgetall">Redis Documentation: HGETALL</a>
*/
Map<byte[], byte[]> hGetAll(byte[] key);
/**
* Use a {@link Cursor} to iterate over entries in hash at {@code key}.
*
* @param key must not be {@literal null}.
* @param options must not be {@literal null}.
* @return
* @since 1.4
* @see <a href="http://redis.io/commands/hscan">Redis Documentation: HSCAN</a>
*/
Cursor<Map.Entry<byte[], byte[]>> hScan(byte[] key, ScanOptions options);
}