Building Applications with Spring Data Redis - Spring Data - page 113

We can provide the CRUD operations for the Contact objects by implementing the
ContactService interface. Let's start by creating a dummy service implementation
and adding or implementing the actual CRUD operations later. The steps needed to
create a dummy service implementation are described as follows:

1. Implement the ContactService interface.

2. Annotate the created class with the @Service annotation.

3. Add the required dependencies as private members of the created class and

annotate these members with the @Resource annotation. We need to have a
reference to both the RedisTemplate and RedisAtomicLong objects.

The source code of our dummy service implementation is given as follows:

@Service
public class RedisContactService implements ContactService {

@Resource
private RedisAtomicLong contactIdCounter;

@Resource
private RedisTemplate<String, Contact> redisTemplate;

//Add methods here
}

We also have to implement some utility methods that are used by the methods
declared by the ContactService interface. These private methods are described in
the following table:

Method Description

String buildKey(Long contactId) Returns a key for a contact.

void persist(Contact persisted) Saves the contact information to a string

value.

First, we have to implement a method that is used to build keys for the persisted
Contact objects. The implementation of the buildKey() method is simple. We
build the key by appending the contact ID given as a parameter to a string contact
and return the resulting string. The source code of the buildKey() method is given
as follows:

private String buildKey(Long contactId) {
return "contact" + contactId;
}