Databases Reference
In-Depth Information
Key components
Spring Data Redis provides certain components that are the cornerstones of each
application that uses it. This section provides a brief introduction to the components
that we will later use to implement our example applications.
Atomic counters
Atomic counters are for Redis what sequences are for relational databases. Atomic
counters guarantee that the value received by a client is unique. This makes these
counters a perfect tool for creating unique IDs to our data that is stored in Redis. At
the moment, Spring Data Redis offers two atomic counters:
RedisAtomicInteger
and
RedisAtomicLong
. These classes provide atomic counter operations for integers
and longs.
RedisTemplate
The
RedisTemplate<K,V>
class is the central component of Spring Data Redis. It
provides methods that we can use to communicate with a Redis instance. This class
requires that two type parameters are given during its instantiation: the type of used
Redis key and the type of the Redis value.
Operations
The
RedisTemplate
class provides two kinds of operations that we can use to store,
fetch, and remove data from our Redis instance:
1. Operations that require that the key and the value are given every time an
operation is performed. These operations are handy when we have to execute
a single operation by using a key and a value.
2. Operations that are bound to a specific key that is given only once. We
should use this approach when we have to perform multiple operations by
using the same key.
The methods that require that a key and value is given every time an operation is
performed are described in following list:
•
HashOperations<K,HK,HV> opsForHash()
: This method returns the
operations that are performed on hashes
•
ListOperations<K,V> opsForList()
: This method returns the operations
performed on lists
•
SetOperations<K,V> opsForSet()
: This method returns the operations
performed on sets
