CODEWITHSUNDEEP
javaspringredis
jpganz18
jpganz18

Reputation: 5858

how can I save a List of Objects into Redis using only one key - value?

I am trying to do this.

I have a list of objects (Custom objects), I want to save them all in a single register in Redis, is it possible to save them as ajax somehow? I was reading about Jackson but I couldn't figure it how.

So far I only have this

@Autowired
private StringRedisTemplate redisTmpl;

And I can save like this 

redisTmpl.opsForValue().set("foo", "bar");

Works pretty good, but instead of Bar , I want to save my list of objects (using this StringRedisTemplate.

Any idea how to do it?

Or maybe using another way? But I need to save all the list in just one key.

Thanks

Upvotes: 2

Views: 21689

Answers (5)

Lucas Araújo
Lucas Araújo

Reputation: 567

Using redisson you can do this:

ObjectMapper mapper = new ObjectMapper();
RList<MyObject> list = redissonCLient.getList("myKey");
list.add(mapper.writeValueAsString(new MyObject("test")));

The code above will save a Redis List in JSON format with the MyObjects values.

To retrieve the list you can do:

RList<MyObject> list = redissonCLient.getList("myKey");
List<MyObject> myObjects = mapper.readValue(list.toString(), new TypeReference<List<MyObject>>(){});

Upvotes: 0

Nikita Koksharov
Nikita Koksharov

Reputation: 10793

You can try Redisson as well. It supports many codecs like Jackson JSON, Avro, Smile, CBOR, MsgPack, Kryo, FST, LZ4, Snappy and JDK Serialization. It's very easy in use:

List<Object> list = ...
redisson.getBucket("yourKey").set(list);

// or use Redis list object

redisson.getList("yourKey").addAll(list);

Upvotes: 0

Nebras
Nebras

Reputation: 636

you should use spring support to convert your values to JSON like below example. It also convert your key to string directly.

<bean id="serializer" class="org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer">
    <constructor-arg>
        <value type="java.lang.Class">your.class.path.to.be.saved.in.redis</value>
    </constructor-arg>
</bean>

<bean id="template" class="org.springframework.data.redis.core.RedisTemplate"
        p:connection-factory-ref="redisConnectionFactory">
    <property name="valueSerializer" ref="serializer"/>
    <property name="keySerializer">
        <bean class="org.springframework.data.redis.serializer.StringRedisSerializer"/>
    </property>
   </bean>

Upvotes: 0

jpganz18
jpganz18

Reputation: 5858

I Found the way to do it....

To save all the list you can use jackson, on this way

ObjectMapper mapper = new ObjectMapper();
String jsonInString = mapper.writeValueAsString(myList);

And later you just save it on same way

redisTmpl.opsForValue().set("foo", jsonInString);

Upvotes: 5

Ali Nikneshan
Ali Nikneshan

Reputation: 3502

If you can serialize your object as JSON, you can store it as string in redis. but for this you may need to create serializer/deserializer methods for your class.

Upvotes: 0

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