GH-301 - Add Neo4j event publication repository.

Author: meistermeier

spring-modulith-bom/pom.xml

@@ -124,6 +124,11 @@
 				<artifactId>spring-modulith-starter-mongodb</artifactId>
 				<version>1.1.0-SNAPSHOT</version>
 			</dependency>
+			<dependency>
+				<groupId>org.springframework.modulith</groupId>
+				<artifactId>spring-modulith-starter-neo4j</artifactId>
+				<version>1.1.0-SNAPSHOT</version>
+			</dependency>
 			<dependency>
 				<groupId>org.springframework.modulith</groupId>
 				<artifactId>spring-modulith-starter-test</artifactId>

spring-modulith-events/pom.xml

@@ -23,6 +23,7 @@
 		<module>spring-modulith-events-jpa</module>
 		<module>spring-modulith-events-kafka</module>
 		<module>spring-modulith-events-mongodb</module>
+		<module>spring-modulith-events-neo4j</module>
 	</modules>
 
 	<profiles>

spring-modulith-events/spring-modulith-events-neo4j/pom.xml

@@ -0,0 +1,58 @@
+<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>org.springframework.modulith</groupId>
+        <artifactId>spring-modulith-events</artifactId>
+        <version>1.1.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <name>Spring Modulith - Events - Neo4j-based repository</name>
+    <artifactId>spring-modulith-events-neo4j</artifactId>
+
+    <properties>
+        <module.name>org.springframework.modulith.events.neo4j</module.name>
+    </properties>
+
+    <dependencies>
+
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>spring-modulith-events-core</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.data</groupId>
+            <artifactId>spring-data-neo4j</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-neo4j</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.testcontainers</groupId>
+            <artifactId>neo4j</artifactId>
+            <version>1.19.0</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.testcontainers</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>1.19.0</version>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+</project>

spring-modulith-events/spring-modulith-events-neo4j/src/main/java/org/springframework/modulith/events/neo4j/Neo4jEventPublication.java

@@ -0,0 +1,30 @@
+package org.springframework.modulith.events.neo4j;
+
+import java.time.Instant;
+import java.util.UUID;
+
+/**
+ *
+ * The event publication entity definition.
+ *
+ * @author Gerrit Meier
+ */
+public class Neo4jEventPublication {
+
+	public final UUID identifier;
+	public final Instant publicationDate;
+	public final String listenerId;
+	public final Object event;
+	public final String eventHash;
+
+	public Instant completionDate;
+
+	public Neo4jEventPublication(UUID identifier, Instant publicationDate, String listenerId, Object event, String eventHash) {
+		this.identifier = identifier;
+		this.publicationDate = publicationDate;
+		this.listenerId = listenerId;
+		this.event = event;
+		this.eventHash = eventHash;
+	}
+
+}

spring-modulith-events/spring-modulith-events-neo4j/src/main/java/org/springframework/modulith/events/neo4j/Neo4jEventPublicationAutoConfiguration.java

@@ -0,0 +1,37 @@
+package org.springframework.modulith.events.neo4j;
+
+import org.neo4j.cypherdsl.core.renderer.Configuration;
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.boot.autoconfigure.AutoConfigureBefore;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.annotation.Bean;
+import org.springframework.data.neo4j.core.Neo4jClient;
+import org.springframework.modulith.events.config.EventPublicationAutoConfiguration;
+import org.springframework.modulith.events.config.EventPublicationConfigurationExtension;
+import org.springframework.modulith.events.core.EventSerializer;
+
+/**
+ * @author Gerrit Meier
+ */
+@AutoConfiguration
+@AutoConfigureBefore(EventPublicationAutoConfiguration.class)
+public class Neo4jEventPublicationAutoConfiguration implements EventPublicationConfigurationExtension {
+
+	@Bean
+	Neo4jEventPublicationRepository neo4jEventPublicationRepository(Neo4jClient neo4jClient, Configuration cypherDslConfiguration, EventSerializer eventSerializer) {
+		return new Neo4jEventPublicationRepository(neo4jClient, cypherDslConfiguration, eventSerializer);
+	}
+
+	@Bean
+	@ConditionalOnMissingBean(Configuration.class)
+	Configuration cypherDslConfiguration() {
+		return Configuration.defaultConfig();
+	}
+
+	@Bean
+	@ConditionalOnProperty(name = "spring.modulith.events.neo4j.event-index.enabled", havingValue = "true")
+	Neo4jIndexInitializer neo4jIndexInitializer(Neo4jClient neo4jClient) {
+		return new Neo4jIndexInitializer(neo4jClient);
+	}
+}