neo4j chatmemory implementation

spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chatclient.adoc

@@ -374,7 +374,7 @@ Refer to the xref:_retrieval_augmented_generation[Retrieval Augmented Generation
 
 The interface `ChatMemory` represents a storage for chat conversation history. It provides methods to add messages to a conversation, retrieve messages from a conversation, and clear the conversation history.
 
-There are currently two implementations, `InMemoryChatMemory` and `CassandraChatMemory`, that provide storage for chat conversation history, in-memory and persisted with `time-to-live`, correspondingly.
+There are currently three implementations, `InMemoryChatMemory`, `CassandraChatMemory` and `Neo4jChatMemory`, that provide storage for chat conversation history, in-memory, persisted with `time-to-live` in Cassandra, and persisted without `time-to-live` in Neo4j correspondingly.
 
 To create a `CassandraChatMemory` with `time-to-live`:
 
@@ -383,6 +383,24 @@ To create a `CassandraChatMemory` with `time-to-live`:
 CassandraChatMemory.create(CassandraChatMemoryConfig.builder().withTimeToLive(Duration.ofDays(1)).build());
 ----
 
+The Neo4j chat memory supports the following configuration parameters:
+
+[cols="2,5,1",stripes=even]
+|===
+|Property | Description | Default Value
+
+| `spring.ai.chat.memory.neo4j.messageLabel` | The label for the nodes that store messages | `Message`
+| `spring.ai.chat.memory.neo4j.sessionLabel` | The label for the nodes that store conversation sessions | `Session`
+| `spring.ai.chat.memory.neo4j.toolCallLabel` | The label for nodes that store tool calls, for example
+in Assistant Messages | `ToolCall`
+| `spring.ai.chat.memory.neo4j.metadataLabel` | The label for the node that store a message metadata | `Metadata`
+| `spring.ai.chat.memory.neo4j.toolResponseLabel` | The label for the nodes that store tool responses | `ToolResponse`
+| `spring.ai.chat.memory.neo4j.mediaLabel` | The label for the nodes that store the media associated to a message | `ToolResponse`
+
+
+|===
+
+
 The following advisor implementations use the `ChatMemory` interface to advice the prompt with conversation history which differ in the details of how the memory is added to the prompt
 
 * `MessageChatMemoryAdvisor` :  Memory is retrieved and added as a collection of messages to the prompt

spring-ai-spring-boot-autoconfigure/src/main/java/org/springframework/ai/autoconfigure/chat/memory/neo4j/Neo4jChatMemoryAutoConfiguration.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2023-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.ai.autoconfigure.chat.memory.neo4j;
+
+import org.neo4j.driver.Driver;
+import org.springframework.ai.chat.memory.neo4j.Neo4jChatMemory;
+import org.springframework.ai.chat.memory.neo4j.Neo4jChatMemoryConfig;
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.neo4j.Neo4jAutoConfiguration;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+
+/**
+ * {@link AutoConfiguration Auto-configuration} for {@link Neo4jChatMemory}.
+ *
+ * @author Enrico Rampazzo
+ * @since 1.0.0
+ */
+@AutoConfiguration(after = Neo4jAutoConfiguration.class)
+@ConditionalOnClass({ Neo4jChatMemory.class, Driver.class })
+@EnableConfigurationProperties(Neo4jChatMemoryProperties.class)
+public class Neo4jChatMemoryAutoConfiguration {
+
+	@Bean
+	@ConditionalOnMissingBean
+	public Neo4jChatMemory chatMemory(Neo4jChatMemoryProperties properties, Driver driver) {
+
+		var builder = Neo4jChatMemoryConfig.builder()
+			.withMediaLabel(properties.getMediaLabel())
+			.withMessageLabel(properties.getMessageLabel())
+			.withMetadataLabel(properties.getMetadataLabel())
+			.withSessionLabel(properties.getSessionLabel())
+			.withToolCallLabel(properties.getToolCallLabel())
+			.withToolResponseLabel(properties.getToolResponseLabel())
+			.withDriver(driver);
+
+		return Neo4jChatMemory.create(builder.build());
+	}
+
+}

spring-ai-spring-boot-autoconfigure/src/main/java/org/springframework/ai/autoconfigure/chat/memory/neo4j/Neo4jChatMemoryProperties.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright 2023-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.ai.autoconfigure.chat.memory.neo4j;
+
+import org.springframework.ai.autoconfigure.chat.memory.CommonChatMemoryProperties;
+import org.springframework.ai.chat.memory.neo4j.Neo4jChatMemoryConfig;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+/**
+ * Configuration properties for Neo4j chat memory.
+ *
+ * @author Enrico Rampazzo
+ */
+@ConfigurationProperties(Neo4jChatMemoryProperties.CONFIG_PREFIX)
+public class Neo4jChatMemoryProperties {
+
+	public static final String CONFIG_PREFIX = "spring.ai.chat.memory.neo4j";
+
+	private String sessionLabel = Neo4jChatMemoryConfig.DEFAULT_SESSION_LABEL;
+
+	private String toolCallLabel = Neo4jChatMemoryConfig.DEFAULT_TOOL_CALL_LABEL;
+
+	private String metadataLabel = Neo4jChatMemoryConfig.DEFAULT_METADATA_LABEL;
+
+	private String messageLabel = Neo4jChatMemoryConfig.DEFAULT_MESSAGE_LABEL;
+
+	private String toolResponseLabel = Neo4jChatMemoryConfig.DEFAULT_TOOL_RESPONSE_LABEL;
+
+	private String mediaLabel = Neo4jChatMemoryConfig.DEFAULT_MEDIA_LABEL;
+
+	public String getSessionLabel() {
+		return sessionLabel;
+	}
+
+	public void setSessionLabel(String sessionLabel) {
+		this.sessionLabel = sessionLabel;
+	}
+
+	public String getToolCallLabel() {
+		return toolCallLabel;
+	}
+
+	public String getMetadataLabel() {
+		return metadataLabel;
+	}
+
+	public String getMessageLabel() {
+		return messageLabel;
+	}
+
+	public String getToolResponseLabel() {
+		return toolResponseLabel;
+	}
+
+	public String getMediaLabel() {
+		return mediaLabel;
+	}
+
+	public void setToolCallLabel(String toolCallLabel) {
+		this.toolCallLabel = toolCallLabel;
+	}
+
+	public void setMetadataLabel(String metadataLabel) {
+		this.metadataLabel = metadataLabel;
+	}
+
+	public void setMessageLabel(String messageLabel) {
+		this.messageLabel = messageLabel;
+	}
+
+	public void setToolResponseLabel(String toolResponseLabel) {
+		this.toolResponseLabel = toolResponseLabel;
+	}
+
+	public void setMediaLabel(String mediaLabel) {
+		this.mediaLabel = mediaLabel;
+	}
+
+}

spring-ai-spring-boot-autoconfigure/src/test/java/org/springframework/ai/autoconfigure/chat/memory/neo4j/Neo4jChatMemoryAutoConfigurationIT.java

@@ -0,0 +1,156 @@
+/*
+ * Copyright 2023-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.ai.autoconfigure.chat.memory.neo4j;
+
+import com.datastax.driver.core.utils.UUIDs;
+import org.junit.jupiter.api.Test;
+import org.springframework.ai.chat.memory.neo4j.Neo4jChatMemory;
+import org.springframework.ai.chat.memory.neo4j.Neo4jChatMemoryConfig;
+import org.springframework.ai.chat.messages.*;
+import org.springframework.ai.chat.messages.ToolResponseMessage.ToolResponse;
+import org.springframework.ai.model.Media;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.autoconfigure.neo4j.Neo4jAutoConfiguration;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.util.MimeType;
+import org.testcontainers.containers.Neo4jContainer;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
+import org.testcontainers.utility.DockerImageName;
+
+import java.net.URI;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Mick Semb Wever
+ * @author Jihoon Kim
+ * @since 1.0.0
+ */
+@Testcontainers
+class Neo4jChatMemoryAutoConfigurationIT {
+
+	static final DockerImageName DEFAULT_IMAGE_NAME = DockerImageName.parse("neo4j");
+
+	@SuppressWarnings({ "rawtypes", "resource" })
+	@Container
+	static Neo4jContainer neo4jContainer = (Neo4jContainer) new Neo4jContainer(DEFAULT_IMAGE_NAME.withTag("5"))
+		.withoutAuthentication()
+		.withExposedPorts(7474, 7687);
+
+	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+		.withConfiguration(AutoConfigurations.of(Neo4jChatMemoryAutoConfiguration.class, Neo4jAutoConfiguration.class));
+
+	@Test
+	void addAndGet() {
+		this.contextRunner.withPropertyValues("spring.neo4j.uri=" + neo4jContainer.getBoltUrl()).run(context -> {
+			Neo4jChatMemory memory = context.getBean(Neo4jChatMemory.class);
+
+			String sessionId = UUIDs.timeBased().toString();
+			assertThat(memory.get(sessionId, Integer.MAX_VALUE)).isEmpty();
+
+			UserMessage userMessage = new UserMessage("test question");
+
+			memory.add(sessionId, userMessage);
+			List<Message> messages = memory.get(sessionId, Integer.MAX_VALUE);
+			assertThat(messages).hasSize(1);
+			assertThat(messages.get(0)).usingRecursiveAssertion().isEqualTo(userMessage);
+
+			memory.clear(sessionId);
+			assertThat(memory.get(sessionId, Integer.MAX_VALUE)).isEmpty();
+
+			AssistantMessage assistantMessage = new AssistantMessage("test answer", Map.of(),
+					List.of(new AssistantMessage.ToolCall("id", "type", "name", "arguments")));
+
+			memory.add(sessionId, List.of(userMessage, assistantMessage));
+			messages = memory.get(sessionId, Integer.MAX_VALUE);
+			assertThat(messages).hasSize(2);
+			assertThat(messages.get(1)).isEqualTo(userMessage);
+
+			assertThat(messages.get(0)).isEqualTo(assistantMessage);
+			memory.clear(sessionId);
+			MimeType textPlain = MimeType.valueOf("text/plain");
+			List<Media> media = List.of(
+					Media.builder()
+						.name("some media")
+						.id(UUIDs.random().toString())
+						.mimeType(textPlain)
+						.data("hello".getBytes(StandardCharsets.UTF_8))
+						.build(),
+					Media.builder().data(URI.create("http://www.google.com").toURL()).mimeType(textPlain).build());
+			UserMessage userMessageWithMedia = new UserMessage("Message with media", media);
+			memory.add(sessionId, userMessageWithMedia);
+
+			messages = memory.get(sessionId, Integer.MAX_VALUE);
+			assertThat(messages.size()).isEqualTo(1);
+			assertThat(messages.get(0)).isEqualTo(userMessageWithMedia);
+			assertThat(((UserMessage) messages.get(0)).getMedia()).hasSize(2);
+			assertThat(((UserMessage) messages.get(0)).getMedia()).usingRecursiveFieldByFieldElementComparator()
+				.isEqualTo(media);
+			memory.clear(sessionId);
+			ToolResponseMessage toolResponseMessage = new ToolResponseMessage(
+					List.of(new ToolResponse("id", "name", "responseData"),
+							new ToolResponse("id2", "name2", "responseData2")),
+					Map.of("id", "id", "metadataKey", "metadata"));
+			memory.add(sessionId, toolResponseMessage);
+			messages = memory.get(sessionId, Integer.MAX_VALUE);
+			assertThat(messages.size()).isEqualTo(1);
+			assertThat(messages.get(0)).isEqualTo(toolResponseMessage);
+
+			memory.clear(sessionId);
+			SystemMessage sm = new SystemMessage("this is a System message");
+			memory.add(sessionId, sm);
+			messages = memory.get(sessionId, Integer.MAX_VALUE);
+			assertThat(messages).hasSize(1);
+			assertThat(messages.get(0)).usingRecursiveAssertion().isEqualTo(sm);
+		});
+	}
+
+	@Test
+	void setCustomConfiguration() {
+		final String sessionLabel = "LabelSession";
+		final String toolCallLabel = "LabelToolCall";
+		final String metadataLabel = "LabelMetadata";
+		final String messageLabel = "LabelMessage";
+		final String toolResponseLabel = "LabelToolResponse";
+		final String mediaLabel = "LabelMedia";
+
+		final String propertyBase = "spring.ai.chat.memory.neo4j.%s=%s";
+		this.contextRunner
+			.withPropertyValues("spring.neo4j.uri=" + neo4jContainer.getBoltUrl(),
+					propertyBase.formatted("sessionlabel", sessionLabel),
+					propertyBase.formatted("toolcallLabel", toolCallLabel),
+					propertyBase.formatted("metadatalabel", metadataLabel),
+					propertyBase.formatted("messagelabel", messageLabel),
+					propertyBase.formatted("toolresponselabel", toolResponseLabel),
+					propertyBase.formatted("medialabel", mediaLabel))
+			.run(context -> {
+				Neo4jChatMemory chatMemory = context.getBean(Neo4jChatMemory.class);
+				Neo4jChatMemoryConfig config = chatMemory.getConfig();
+				assertThat(config.getMessageLabel()).isEqualTo(messageLabel);
+				assertThat(config.getMediaLabel()).isEqualTo(mediaLabel);
+				assertThat(config.getMetadataLabel()).isEqualTo(metadataLabel);
+				assertThat(config.getSessionLabel()).isEqualTo(sessionLabel);
+				assertThat(config.getToolResponseLabel()).isEqualTo(toolResponseLabel);
+				assertThat(config.getToolCallLabel()).isEqualTo(toolCallLabel);
+			});
+	}
+
+}

spring-ai-spring-boot-autoconfigure/src/test/java/org/springframework/ai/autoconfigure/chat/memory/neo4j/Neo4jChatMemoryPropertiesTest.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2023-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.ai.autoconfigure.chat.memory.neo4j;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.ai.chat.memory.neo4j.Neo4jChatMemoryConfig;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Enrico Rampazzo
+ * @since 1.0.0
+ */
+class Neo4jChatMemoryPropertiesTest {
+
+	@Test
+	void defaultValues() {
+		var props = new Neo4jChatMemoryProperties();
+		assertThat(props.getMediaLabel()).isEqualTo(Neo4jChatMemoryConfig.DEFAULT_MEDIA_LABEL);
+		assertThat(props.getMessageLabel()).isEqualTo(Neo4jChatMemoryConfig.DEFAULT_MESSAGE_LABEL);
+		assertThat(props.getMetadataLabel()).isEqualTo(Neo4jChatMemoryConfig.DEFAULT_METADATA_LABEL);
+		assertThat(props.getSessionLabel()).isEqualTo(Neo4jChatMemoryConfig.DEFAULT_SESSION_LABEL);
+		assertThat(props.getToolCallLabel()).isEqualTo(Neo4jChatMemoryConfig.DEFAULT_TOOL_CALL_LABEL);
+		assertThat(props.getToolResponseLabel()).isEqualTo(Neo4jChatMemoryConfig.DEFAULT_TOOL_RESPONSE_LABEL);
+	}
+
+}