[Feature] Redis embedding store spring boot starter

.sdkmanrc

@@ -3,4 +3,4 @@
 # See https://sdkman.io/usage#config
 # A summary is to add the following to ~/.sdkman/etc/config
 # sdkman_auto_env=true
-java=17.0.11-tem
+java=17.0.11-tem

langchain4j-qianfan-spring-boot-starter/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>dev.langchain4j</groupId>
         <artifactId>langchain4j-spring</artifactId>
-        <version>0.30.0</version>
+        <version>0.32.0-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 

langchain4j-redis-spring-boot-starter/pom.xml

@@ -0,0 +1,91 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>dev.langchain4j</groupId>
+        <artifactId>langchain4j-spring</artifactId>
+        <version>0.32.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>langchain4j-redis-spring-boot-starter</artifactId>
+    <name>LangChain4j Spring Boot starter for Redis</name>
+    <packaging>jar</packaging>
+
+    <dependencies>
+
+        <dependency>
+            <groupId>dev.langchain4j</groupId>
+            <artifactId>langchain4j-redis</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-autoconfigure-processor</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <!-- should be listed before spring-boot-configuration-processor -->
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <scope>provided</scope>
+        </dependency>
+
+        <!-- needed to generate automatic metadata about available config properties -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-configuration-processor</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>dev.langchain4j</groupId>
+            <artifactId>langchain4j-embeddings-all-minilm-l6-v2-q</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>dev.langchain4j</groupId>
+            <artifactId>langchain4j-spring-boot-tests</artifactId>
+            <version>${project.version}</version>
+            <classifier>tests</classifier>
+            <type>test-jar</type>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>com.redis.testcontainers</groupId>
+            <artifactId>testcontainers-redis</artifactId>
+            <version>1.6.4</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.tinylog</groupId>
+            <artifactId>tinylog-impl</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.tinylog</groupId>
+            <artifactId>slf4j-tinylog</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+
+</project>

langchain4j-redis-spring-boot-starter/src/main/java/dev/langchain4j/store/embedding/redis/spring/RedisEmbeddingStoreAutoConfiguration.java

@@ -0,0 +1,47 @@
+package dev.langchain4j.store.embedding.redis.spring;
+
+import dev.langchain4j.model.embedding.EmbeddingModel;
+import dev.langchain4j.store.embedding.redis.RedisEmbeddingStore;
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.lang.Nullable;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+import static dev.langchain4j.store.embedding.redis.spring.RedisEmbeddingStoreProperties.PREFIX;
+
+@AutoConfiguration
+@EnableConfigurationProperties(RedisEmbeddingStoreProperties.class)
+@ConditionalOnProperty(prefix = PREFIX, name = "enabled", havingValue = "true", matchIfMissing = true)
+public class RedisEmbeddingStoreAutoConfiguration {
+
+    private static final String DEFAULT_HOST = "localhost";
+    private static final int DEFAULT_PORT = 6379;
+    private static final String DEFAULT_INDEX_NAME = "langchain4j-index";
+
+    @Bean
+    @ConditionalOnMissingBean
+    public RedisEmbeddingStore redisEmbeddingStore(RedisEmbeddingStoreProperties properties,
+                                                   @Nullable EmbeddingModel embeddingModel) {
+        String host = Optional.ofNullable(properties.getHost()).orElse(DEFAULT_HOST);
+        int port = Optional.ofNullable(properties.getPort()).orElse(DEFAULT_PORT);
+        String indexName = Optional.ofNullable(properties.getIndexName()).orElse(DEFAULT_INDEX_NAME);
+        Integer dimension = Optional.ofNullable(properties.getDimension()).orElseGet(() -> embeddingModel == null ? null : embeddingModel.dimension());
+        List<String> metadataKeys = Optional.ofNullable(properties.getMetadataKeys()).orElse(new ArrayList<>());
+
+        return RedisEmbeddingStore.builder()
+                .host(host)
+                .port(port)
+                .user(properties.getUser())
+                .password(properties.getPassword())
+                .indexName(indexName)
+                .dimension(dimension)
+                .metadataKeys(metadataKeys)
+                .build();
+    }
+}

langchain4j-redis-spring-boot-starter/src/main/java/dev/langchain4j/store/embedding/redis/spring/RedisEmbeddingStoreProperties.java

@@ -0,0 +1,24 @@
+package dev.langchain4j.store.embedding.redis.spring;
+
+import lombok.Getter;
+import lombok.Setter;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@ConfigurationProperties(prefix = RedisEmbeddingStoreProperties.PREFIX)
+@Getter
+@Setter
+public class RedisEmbeddingStoreProperties {
+
+    static final String PREFIX = "langchain4j.redis";
+
+    private String host;
+    private Integer port;
+    private String user;
+    private String password;
+    private String indexName;
+    private Integer dimension;
+    private List<String> metadataKeys;
+}

langchain4j-redis-spring-boot-starter/src/main/resources/META-INF/spring.factories

@@ -0,0 +1 @@
+org.springframework.boot.autoconfigure.EnableAutoConfiguration=dev.langchain4j.store.embedding.redis.spring.RedisEmbeddingStoreAutoConfiguration

langchain4j-redis-spring-boot-starter/src/test/java/dev/langchain4j/store/embedding/redis/spring/RedisEmbeddingStoreAutoConfigurationIT.java

@@ -0,0 +1,61 @@
+package dev.langchain4j.store.embedding.redis.spring;
+
+import com.redis.testcontainers.RedisContainer;
+import dev.langchain4j.data.segment.TextSegment;
+import dev.langchain4j.store.embedding.EmbeddingStore;
+import dev.langchain4j.store.embedding.redis.RedisEmbeddingStore;
+import dev.langchain4j.store.embedding.spring.EmbeddingStoreAutoConfigurationIT;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.testcontainers.containers.wait.strategy.Wait;
+import redis.clients.jedis.JedisPooled;
+
+import static com.redis.testcontainers.RedisStackContainer.DEFAULT_IMAGE_NAME;
+import static com.redis.testcontainers.RedisStackContainer.DEFAULT_TAG;
+
+class RedisEmbeddingStoreAutoConfigurationIT extends EmbeddingStoreAutoConfigurationIT {
+
+    static RedisContainer redis = new RedisContainer(DEFAULT_IMAGE_NAME.withTag(DEFAULT_TAG))
+            .waitingFor(Wait.defaultWaitStrategy());
+
+    @BeforeAll
+    static void beforeAll() {
+        redis.start();
+    }
+
+    @AfterAll
+    static void afterAll() {
+        redis.stop();
+    }
+
+    @BeforeEach
+    void beforeEach() {
+        try (JedisPooled jedis = new JedisPooled(redis.getHost(), redis.getFirstMappedPort())) {
+            jedis.flushDB(); // TODO fix: why redis returns embeddings from different indexes?
+        }
+    }
+
+    @Override
+    protected Class<?> autoConfigurationClass() {
+        return RedisEmbeddingStoreAutoConfiguration.class;
+    }
+
+    @Override
+    protected Class<? extends EmbeddingStore<TextSegment>> embeddingStoreClass() {
+        return RedisEmbeddingStore.class;
+    }
+
+    @Override
+    protected String[] properties() {
+        return new String[]{
+                "langchain4j.redis.host=" + redis.getHost(),
+                "langchain4j.redis.port=" + redis.getFirstMappedPort()
+        };
+    }
+
+    @Override
+    protected String dimensionPropertyKey() {
+        return "langchain4j.redis.dimension";
+    }
+}

pom.xml

@@ -24,13 +24,15 @@
         <module>langchain4j-azure-open-ai-spring-boot-starter</module>
         <module>langchain4j-vertex-ai-gemini-spring-boot-starter</module>
         <module>langchian4j-elasticsearch-spring-boot-starter</module>
+        <module>langchain4j-redis-spring-boot-starter</module>
         <module>langchain4j-qianfan-spring-boot-starter</module>
     </modules>
 
     <properties>
         <maven.compiler.source>17</maven.compiler.source>
         <maven.compiler.target>17</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <tinylog.version>2.6.2</tinylog.version>
         <spring.boot.version>3.2.6</spring.boot.version>
         <testcontainers.version>1.19.8</testcontainers.version>
         <tinylog.version>2.6.2</tinylog.version>