org.springframework.data.redis.connection

Interface RedisKeyCommands

All Known Subinterfaces:

DefaultedRedisClusterConnection, DefaultedRedisConnection, RedisClusterConnection, RedisCommands, RedisConnection, RedisConnectionUtils.RedisConnectionProxy, StringRedisConnection

All Known Implementing Classes:

AbstractRedisConnection, DefaultStringRedisConnection, JedisClusterConnection, JedisConnection, LettuceClusterConnection, LettuceConnection

public interface RedisKeyCommands

Key-specific commands supported by Redis.

Author:

Costin Leau, Christoph Strobl, Mark Paluch

Method Summary

Modifier and Type	Method and Description
Long	del(byte[]... keys) Delete given keys.
byte[]	dump(byte[] key) Retrieve serialized version of the value stored at key.
ValueEncoding	encodingOf(byte[] key) Get the type of internal representation used for storing the value at the given key.
Long	exists(byte[]... keys) Count how many of the given keys exist.
default Boolean	exists(byte[] key) Determine if given key exists.
Boolean	expire(byte[] key, long seconds) Set time to live for given key in seconds.
Boolean	expireAt(byte[] key, long unixTime) Set the expiration for given key as a UNIX timestamp.
Duration	idletime(byte[] key) Get the Duration since the object stored at the given key is idle.
Set<byte[]>	keys(byte[] pattern) Find all keys matching the given pattern.
Boolean	move(byte[] key, int dbIndex) Move given key to database with index.
Boolean	persist(byte[] key) Remove the expiration from given key.
Boolean	pExpire(byte[] key, long millis) Set time to live for given key in milliseconds.
Boolean	pExpireAt(byte[] key, long unixTimeInMillis) Set the expiration for given key as a UNIX timestamp in milliseconds.
Long	pTtl(byte[] key) Get the precise time to live for key in milliseconds.
Long	pTtl(byte[] key, TimeUnit timeUnit) Get the precise time to live for key in and convert it to the given TimeUnit.
byte[]	randomKey() Return a random key from the keyspace.
Long	refcount(byte[] key) Get the number of references of the value associated with the specified key.
void	rename(byte[] sourceKey, byte[] targetKey) Rename key sourceKey to targetKey.
Boolean	renameNX(byte[] sourceKey, byte[] targetKey) Rename key sourceKey to targetKey only if targetKey does not exist.
default void	restore(byte[] key, long ttlInMillis, byte[] serializedValue) Create key using the serializedValue, previously obtained using dump(byte[]).
void	restore(byte[] key, long ttlInMillis, byte[] serializedValue, boolean replace) Create key using the serializedValue, previously obtained using dump(byte[]).
Cursor<byte[]>	scan(ScanOptions options) Use a Cursor to iterate over keys.
List<byte[]>	sort(byte[] key, SortParameters params) Sort the elements for key.
Long	sort(byte[] key, SortParameters params, byte[] storeKey) Sort the elements for key and store result in storeKey.
Long	touch(byte[]... keys) Alter the last access time of given key(s).
Long	ttl(byte[] key) Get the time to live for key in seconds.
Long	ttl(byte[] key, TimeUnit timeUnit) Get the time to live for key in and convert it to the given TimeUnit.
DataType	type(byte[] key) Determine the type stored at key.
Long	unlink(byte[]... keys) Unlink the keys from the keyspace.

Method Detail

exists

@Nullable
default Boolean exists(byte[] key)

Determine if given key exists.

Parameters:

key - must not be null.

Returns:

true if key exists. null when used in pipeline / transaction.

See Also:

Redis Documentation: EXISTS

exists

@Nullable
Long exists(byte[]... keys)

Count how many of the given keys exist. Providing the very same key more than once also counts multiple times.

Parameters:

keys - must not be null.

Returns:

the number of keys existing among the ones specified as arguments. null when used in pipeline / transaction.

Since:

2.1

del

@Nullable
Long del(byte[]... keys)

Delete given keys.

Parameters:

keys - must not be null.

Returns:

The number of keys that were removed. null when used in pipeline / transaction.

See Also:

Redis Documentation: DEL

unlink

@Nullable
Long unlink(byte[]... keys)

Unlink the keys from the keyspace. Unlike with #del(byte[]...) the actual memory reclaiming here happens asynchronously.

Parameters:

keys - must not be null.

Returns:

null when used in pipeline / transaction.

Since:

2.1

See Also:

Redis Documentation: UNLINK

type

@Nullable
DataType type(byte[] key)

Determine the type stored at key.

Parameters:

key - must not be null.

Returns:

null when used in pipeline / transaction.

See Also:

Redis Documentation: TYPE

touch

@Nullable
Long touch(byte[]... keys)

Alter the last access time of given key(s).

Parameters:

keys - must not be null.

Returns:

null when used in pipeline / transaction.

Since:

2.1

See Also:

Redis Documentation: TOUCH

keys

@Nullable
Set<byte[]> keys(byte[] pattern)

Find all keys matching the given pattern.

Parameters:

pattern - must not be null.

Returns:

empty Set if no match found. null when used in pipeline / transaction.

See Also:

Redis Documentation: KEYS

scan

Cursor<byte[]> scan(ScanOptions options)

Use a Cursor to iterate over keys.

Parameters:

options - must not be null.

Returns:

never null.

Since:

1.4

See Also:

Redis Documentation: SCAN

randomKey

@Nullable
byte[] randomKey()

Return a random key from the keyspace.

Returns:

null if no keys available or when used in pipeline or transaction.

See Also:

Redis Documentation: RANDOMKEY

rename

void rename(byte[] sourceKey,
            byte[] targetKey)

Rename key sourceKey to targetKey.

Parameters:

sourceKey - must not be null.

targetKey - must not be null.

See Also:

Redis Documentation: RENAME

renameNX

@Nullable
Boolean renameNX(byte[] sourceKey,
                           byte[] targetKey)

Rename key sourceKey to targetKey only if targetKey does not exist.

Parameters:

sourceKey - must not be null.

targetKey - must not be null.

Returns:

null when used in pipeline / transaction.

See Also:

Redis Documentation: RENAMENX

expire

@Nullable
Boolean expire(byte[] key,
                         long seconds)

Set time to live for given key in seconds.

Parameters:

key - must not be null.

seconds -

Returns:

null when used in pipeline / transaction.

See Also:

Redis Documentation: EXPIRE

pExpire

@Nullable
Boolean pExpire(byte[] key,
                          long millis)

Set time to live for given key in milliseconds.

Parameters:

key - must not be null.

millis -

Returns:

null when used in pipeline / transaction.

See Also:

Redis Documentation: PEXPIRE

expireAt

@Nullable
Boolean expireAt(byte[] key,
                           long unixTime)

Set the expiration for given key as a UNIX timestamp.

Parameters:

key - must not be null.

unixTime -

Returns:

null when used in pipeline / transaction.

See Also:

Redis Documentation: EXPIREAT

pExpireAt

@Nullable
Boolean pExpireAt(byte[] key,
                            long unixTimeInMillis)

Set the expiration for given key as a UNIX timestamp in milliseconds.

Parameters:

key - must not be null.

unixTimeInMillis -

Returns:

null when used in pipeline / transaction.

See Also:

Redis Documentation: PEXPIREAT

persist

@Nullable
Boolean persist(byte[] key)

Remove the expiration from given key.

Parameters:

key - must not be null.

Returns:

null when used in pipeline / transaction.

See Also:

Redis Documentation: PERSIST

move

@Nullable
Boolean move(byte[] key,
                       int dbIndex)

Move given key to database with index.

Parameters:

key - must not be null.

dbIndex -

Returns:

null when used in pipeline / transaction.

See Also:

Redis Documentation: MOVE

ttl

@Nullable
Long ttl(byte[] key)

Get the time to live for key in seconds.

Parameters:

key - must not be null.

Returns:

null when used in pipeline / transaction.

See Also:

Redis Documentation: TTL

ttl

@Nullable
Long ttl(byte[] key,
                   TimeUnit timeUnit)

Get the time to live for key in and convert it to the given TimeUnit.

Parameters:

key - must not be null.

timeUnit - must not be null.

Returns:

null when used in pipeline / transaction.

Since:

1.8

See Also:

Redis Documentation: TTL

pTtl

@Nullable
Long pTtl(byte[] key)

Get the precise time to live for key in milliseconds.

Parameters:

key - must not be null.

Returns:

null when used in pipeline / transaction.

See Also:

Redis Documentation: PTTL

pTtl

@Nullable
Long pTtl(byte[] key,
                    TimeUnit timeUnit)

Get the precise time to live for key in and convert it to the given TimeUnit.

Parameters:

key - must not be null.

timeUnit - must not be null.

Returns:

null when used in pipeline / transaction.

Since:

1.8

See Also:

Redis Documentation: PTTL

sort

@Nullable
List<byte[]> sort(byte[] key,
                            SortParameters params)

Sort the elements for key.

Parameters:

key - must not be null.

params - must not be null.

Returns:

null when used in pipeline / transaction.

See Also:

Redis Documentation: SORT

sort

@Nullable
Long sort(byte[] key,
                    SortParameters params,
                    byte[] storeKey)

Sort the elements for key and store result in storeKey.

Parameters:

key - must not be null.

params - must not be null.

storeKey - must not be null.

Returns:

null when used in pipeline / transaction.

See Also:

Redis Documentation: SORT

dump

@Nullable
byte[] dump(byte[] key)

Retrieve serialized version of the value stored at key.

Parameters:

key - must not be null.

Returns:

null if key does not exist or when used in pipeline / transaction.

See Also:

Redis Documentation: DUMP

restore

default void restore(byte[] key,
                     long ttlInMillis,
                     byte[] serializedValue)

Create key using the serializedValue, previously obtained using dump(byte[]).

Parameters:

key - must not be null.

ttlInMillis -

serializedValue - must not be null.

See Also:

Redis Documentation: RESTORE

restore

void restore(byte[] key,
             long ttlInMillis,
             byte[] serializedValue,
             boolean replace)

Create key using the serializedValue, previously obtained using dump(byte[]).

Parameters:

key - must not be null.

ttlInMillis -

serializedValue - must not be null.

replace - use true to replace a potentially existing value instead of erroring.

Since:

2.1

See Also:

Redis Documentation: RESTORE

encodingOf

@Nullable
ValueEncoding encodingOf(byte[] key)

Get the type of internal representation used for storing the value at the given key.

Parameters:

key - must not be null.

Returns:

ValueEncoding.RedisValueEncoding.VACANT if key does not exist or null when used in pipeline / transaction.

Throws:

IllegalArgumentException - if key is null.

Since:

2.1

See Also:

Redis Documentation: OBJECT ENCODING

idletime

@Nullable
Duration idletime(byte[] key)

Get the Duration since the object stored at the given key is idle.

Parameters:

key - must not be null.

Returns:

null if key does not exist or when used in pipeline / transaction.

Throws:

IllegalArgumentException - if key is null.

Since:

2.1

See Also:

Redis Documentation: OBJECT IDLETIME

refcount

@Nullable
Long refcount(byte[] key)

Get the number of references of the value associated with the specified key.

Parameters:

key - must not be null.

Returns:

null if key does not exist or when used in pipeline / transaction.

Throws:

IllegalArgumentException - if key is null.

Since:

2.1

See Also:

Redis Documentation: OBJECT REFCOUNT