Object Mapping (and more) for Redis!

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Redis OM Spring extends Spring Data Redis to take full advantage of the power of Redis.

Project Stage	Release	Snapshot	Issues	Resolution	Code QL	License	SDR Version

Table of contents

• 💡 Why Redis OM?
• 🍀 Redis OM Spring
• 🏁 Getting Started
• 💻 Maven configuration
• 📚 Documentation
• ⛏️ Troubleshooting
• ✨ So, How Do You Get RediSearch and RedisJSON?
• 💖 Contributing
• 🧑‍🤝‍🧑 Sibling Projects
• 📝 License

💡 Why Redis OM?

The Redis OM family of projects aim is to provide high-level abstractions idiomatically implemented for your language/platform of choice. We currently cater to the Node, Python, .Net and Spring communities.

🍀 Redis OM Spring

Redis OM Spring provides powerful repository and custom object-mapping abstractions built on top of the powerful Spring Data Redis (SDR) framework.

This preview release provides all of SDRs capabilities plus:

• @Document annotation to map Spring Data models to Redis JSON documents
• Enhances SDRs @RedisHash via @EnableRedisEnhancedRepositories to:
  • uses Redis' native search engine (RediSearch) for secondary indexing
  • uses ULID for @Id annotated fields
• RedisDocumentRepository with automatic implementation of Repository interfaces for complex querying capabilities using @EnableRedisDocumentRepositories
• Declarative Search Indices via @Indexable
• Full-text Search Indices via @Searchable
• EntityStreams: Streams-based Query Builder
• @Bloom annotation to determine very fast, with and with high degree of certainty, whether a value is in a collection.

Note: Redis OM Spring currently works only with Jedis.

🏁 Getting Started

Here is a quick teaser of an application using Redis OM Spring to map a Spring Data model using a RedisJSON document.

🚀 Launch Redis

Redis OM Spring relies on the power of the RediSearch and RedisJSON modules. We have provided a docker compose YAML file for you to quickly get started. To launch the docker compose application, on the command line (or via Docker Desktop), clone this repository and run (from the root folder):

docker compose up

The SpringBoot App

Use the @EnableRedisDocumentRepositories annotation to scan for @Document annotated Spring models, Inject repositories beans implementing RedisDocumentRepository which you can use for CRUD operations and custom queries (all by declaring Spring Data Query Interfaces):

package com.redis.om.documents;

import java.util.Set;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.geo.Point;

import com.redis.om.documents.domain.Company;
import com.redis.om.documents.repositories.CompanyRepository;

@SpringBootApplication
@Configuration
@EnableRedisDocumentRepositories(basePackages = "com.redis.om.documents.*")
public class RomsDocumentsApplication {

  @Autowired
  CompanyRepository companyRepo;

  @Bean
  CommandLineRunner loadTestData() {
    return args -> {
      // remove all companies
      companyRepo.deleteAll();

      // Create a couple of `Company` domain entities
      Company redis = Company.of(
        "Redis", "https://redis.com", new Point(-122.066540, 37.377690), 526, 2011 //
      );
      redis.setTags(Set.of("fast", "scalable", "reliable"));

      Company microsoft = Company.of(
        "Microsoft", "https://microsoft.com", new Point(-122.124500, 47.640160), 182268, 1975 //
      );
      microsoft.setTags(Set.of("innovative", "reliable"));

      // save companies to the database
      companyRepo.save(redis);
      companyRepo.save(microsoft);
    };
  }

  public static void main(String[] args) {
    SpringApplication.run(RomsDocumentsApplication.class, args);
  }
}

💁‍♂️ The Mapped Model

Like many other Spring Data projects, an annotation at the class level determines how instances of the class are persisted. Redis OM Spring provides the @Document annotation to persist models as JSON documents using RedisJSON:

package com.redis.om.documents.domain;

import java.util.HashSet;
import java.util.Set;
import org.springframework.data.annotation.Id;
import org.springframework.data.geo.Point;
import com.redis.om.spring.annotations.Document;
import com.redis.om.spring.annotations.Searchable;
import lombok.*;

@Data
@NoArgsConstructor
@RequiredArgsConstructor(staticName = "of")
@AllArgsConstructor(access = AccessLevel.PROTECTED)
@Document
public class Company {
  @Id private String id;
  @Searchable private String name;
  @Indexed private Point location;
  @Indexed private Set<String> tags = new HashSet<String>();
  @Indexed private Integer numberOfEmployees;
  @Indexed private Integer yearFounded;
  private String url;
  private boolean publiclyListed;

  // ...
}

Redis OM Spring, replaces the conventional UUID primary key strategy generation with a ULID (Universally Unique Lexicographically Sortable Identifier) which is faster to generate and easier on the eyes.

🧰 The Repository

Redis OM Spring data repository's goal, like other Spring Data repositories, is to significantly reduce the amount of boilerplate code required to implement data access. Simply create a Java interface that extends RedisDocumentRepository that takes the domain class to manage as well as the ID type of the domain class as type arguments. RedisDocumentRepository extends the Spring Data class PagingAndSortingRepository.

Declare query methods on the interface. You can both, expose CRUD methods or create declarations for complex queries that Redis OM Spring will fulfill at runtime:

package com.redis.om.documents.repositories;

import java.util.*;

import org.springframework.data.geo.Distance;
import org.springframework.data.geo.Point;
import org.springframework.data.repository.query.Param;

import com.redis.om.documents.domain.Company;
import com.redis.om.spring.annotations.Query;
import com.redis.om.spring.repository.RedisDocumentRepository;

public interface CompanyRepository extends RedisDocumentRepository<Company, String> {
  // find one by property
  Optional<Company> findOneByName(String name);

  // geospatial query
  Iterable<Company> findByLocationNear(Point point, Distance distance);

  // find by tag field, using JRediSearch "native" annotation
  @Query("@tags:{$tags}")
  Iterable<Company> findByTags(@Param("tags") Set<String> tags);

  // find by numeric property
  Iterable<Company> findByNumberOfEmployees(int noe);

  // find by numeric property range
  Iterable<Company> findByNumberOfEmployeesBetween(int noeGT, int noeLT);

  // starting with/ending with
  Iterable<Company> findByNameStartingWith(String prefix);
}

The repository proxy has two ways to derive a store-specific query from the method name:

• By deriving the query from the method name directly.
• By using a manually defined query using the @Query or @Aggregation annotations.

🚤 Querying with Entity Streams

Redis OM Spring Entity Streams provides a Java 8 Streams interface to Query Redis JSON documents using RediSearch. Entity Streams allow you to process data in a type safe declarative way similar to SQL statements. Streams can be used to express a query as a chain of operations.

Entity Streams in Redis OM Spring provide the same semantics as Java 8 streams. Streams can be made of Redis Mapped entities (@Document) or one or more properties of an Entity. Entity Streams progressively build the query until a terminal operation is invoked (such as collect). Whenever a Terminal operation is applied to a Stream, the Stream cannot accept additional operations to its pipeline and it also means that the Stream is started.

Let's start with a simple example, a Spring @Service which includes EntityStream to query for instances of the mapped class Person:

package com.redis.om.skeleton.services;

import java.util.stream.Collectors;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.redis.om.skeleton.models.Person;
import com.redis.om.skeleton.models.Person$;
import com.redis.om.spring.search.stream.EntityStream;

@Service
public class PeopleService {
  @Autowired
  EntityStream entityStream;

  // Find all people
  public Iterable<Person> findAllPeople(int minAge, int maxAge) {
    return entityStream //
        .of(Person.class) //
        .collect(Collectors.toList());
  }

}

The EntityStream is injected into the PeopleService using @Autowired. We can then get a stream for Person objects by using entityStream.of(Person.class). At this point the stream represents the equivalent of a SELECT * FROM Person on a relational database. The call to collect will then execute the underlying query and return a collection of all Person objects in Redis.

👭 Entity Meta-model

To produce more elaborate queries, you're provided with a generated meta-model, which is a class with the same name as your model but ending with a dollar sign. In the example below, our entity model is Person therefore we get a meta-model named Person$. With the meta-model you have access to the operations related to the underlying search engine field. For example, in the example we have an age property which is an integer. Therefore our metamodel has an AGE property which has numeric operations we can use with the stream's filter method such as between.

  // Find people by age range
  public Iterable<Person> findByAgeBetween(int minAge, int maxAge) {
    return entityStream //
        .of(Person.class) //
        .filter(Person$.AGE.between(minAge, maxAge)) //
        .sorted(Person$.AGE, SortOrder.ASC) //
        .collect(Collectors.toList());
  }

In this example we also make use of the Streams sorted method to declare that our stream will be sorted by the Person$.AGE in ASCending order.

💻 Maven configuration

Official Releases

<dependency>
  <groupId>com.redis.om</groupId>
  <artifactId>redis-om-spring</artifactId>
  <version>${version}</version>
</dependency>

Snapshots

  <repositories>
    <repository>
      <id>snapshots-repo</id>
      <url>https://s01.oss.sonatype.org/content/repositories/snapshots/</url>
    </repository>
  </repositories>

and

<dependency>
  <groupId>com.redis.om</groupId>
  <artifactId>redis-om-spring</artifactId>
  <version>${version}-SNAPSHOT</version>
</dependency>

Ready to learn more? Check out the getting started guide.

🐘 Gradle configuration

Add Repository - Snapshots Only

repositories {
    mavenCentral()
    maven {
        url 'https://s01.oss.sonatype.org/content/repositories/snapshots/'
    }
}

Dependency

ext {
  redisOmVersion = '0.5.2-SNAPSHOT'
}

dependencies {
    implementation: "com.redis.om:redis-om-spring:$redisOmVersion"
    }
}

📚 Documentation

The Redis OM documentation is available here.

Demos

Basic JSON Mapping and Querying

• roms-documents:
  • Simple API example of @Document mapping, Spring Repositories and Querying.
  • Run with ./mvnw install -Dmaven.test.skip && ./mvnw spring-boot:run -pl demos/roms-documents
• rds-hashes:
  • Simple API example of @RedisHash, enhanced secondary indices and querying.
  • Run with ./mvnw install -Dmaven.test.skip && ./mvnw spring-boot:run -pl demos/roms-hashes
• rds-permits:
  • Port of Elena Kolevska's Quick Start: Using RediSearch with JSON [Demo][redisearch-wjso] to Redis OM Spring.
  • Run with ./mvnw install -Dmaven.test.skip && ./mvnw spring-boot:run -pl demos/roms-permits

⛏️ Troubleshooting

If you run into trouble or have any questions, we're here to help!

First, check the FAQ. If you don't find the answer there, hit us up on the Redis Discord Server.

✨ So How Do You Get RediSearch and RedisJSON?

Some advanced features of Redis OM rely on core features from two source available Redis modules: RediSearch and RedisJSON.

You can run these modules in your self-hosted Redis deployment, or you can use Redis Enterprise, which includes both modules.

To learn more, read our documentation.

💖 Contributing

We'd love your contributions!

Bug reports are especially helpful at this stage of the project. You can open a bug report on GitHub.

You can also contribute documentation -- or just let us know if something needs more detail. Open an issue on GitHub to get started.

🧑‍🤝‍🧑 Sibling Projects

• Redis OM Node.js
• Redis OM Python
• Redis OM .NET

📝 License

Redis OM uses the MIT license.