HackMDRedis
Installing Redis using Docker
docker pull redis
docker run -p 6379:6379 -d --name redis-cache redis
Note : use the following command if you need to save configuration files in host server not in container:
docker run -p 6379:6379 -d --name redis-cache -v /Users/mac/configs :/usr/redis_config redis redis-server /usr/local/etc/redis/redis.conf
Access redis-cli
docker exec -it redis-cache /bin/bash
redis-cli
Some usefull redis-cli commands
redis-cli info stats : show information about redis
redis-cli info memory: show information about memory
redis-cli ping : check resdis service
redis-cli flushall : clear all cached data
Applying Redis in Micro-service
- Add Spring Data Redis as a dependency in your project
- Add the following properties in application.properties
spring.cache.type=redis
spring.cache.type=none: if you do not have redis in local env.
spring.redis.host=localhost
spring.redis.port=6379 - Add @EnableCaching into your Application class
- Apply cashing Annotations for service layer as in below service class sample
@Override
@Cacheable(value = "allUsersCache")
public List<User> findAll() {
log.info("UserService :: findAll");
return repository.findAll();
}
@Override
@Cacheable(value = "allUsersCache", key = "'wtihParam_'.concat(#param)")
public List<User> findAllWithParam(String param) {
log.info("UserService :: findAll");
return repository.findAll();
}
@Override
@Cacheable(value = "userCache", key="#userId")
public User findOne(int userId) {
log.info("UserService :: findOne");
return repository.getOne(userId);
}
@Override
@Caching(put= { @CachePut(value= "userCache", key= "#user.id") },
evict= { @CacheEvict(value= "allUsersCache", allEntries= true) })
public User save(User user) {
log.info("UserService :: save");
User createdUser = repository.saveAndFlush(user);
sender.send(USER_CREATED_TOPIC, createdUser);
return createdUser;
}
@Override
@Caching(evict= { @CacheEvict(value= "userCache", key= "#userId"),
@CacheEvict(value= "allUsersCache", allEntries= true)})
public void delete(@PathVariable int userId) {
log.info("UserService :: delete");
repository.deleteById(userId);
}
@Override
@Caching(put= { @CachePut(value= "userCache", key= "#user.id") },
evict= { @CacheEvict(value= "allUsersCache", allEntries= true) })
public User update(User user) {
log.info("UserService :: update");
User u = repository.getOne(user.getId());
u.setName(user.getName());
return repository.save(u);
}
