Add examples using Virtual Threads.

Closes #665

redis/pubsub/README.md

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+# Spring Data Redis Pub/Sub Example
+
+This project contains samples of specific features of Spring Data Redis.
+

redis/pubsub/pom.xml

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+<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<artifactId>spring-data-redis-pubsub</artifactId>
+	<name>Spring Data Redis - Pub/Sub</name>
+
+	<parent>
+		<groupId>org.springframework.data.examples</groupId>
+		<artifactId>spring-data-redis-examples</artifactId>
+		<version>2.0.0.BUILD-SNAPSHOT</version>
+		<relativePath>../pom.xml</relativePath>
+	</parent>
+
+	<dependencies>
+
+		<dependency>
+			<groupId>${project.groupId}</groupId>
+			<artifactId>spring-data-redis-example-utils</artifactId>
+			<version>${project.version}</version>
+			<scope>test</scope>
+		</dependency>
+
+	</dependencies>
+
+</project>

redis/pubsub/src/test/java/example/springdata/redis/PubSubTests.java

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+/*
+ * Copyright 2023 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
+ *
+ *      http://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 example.springdata.redis;
+
+import static org.assertj.core.api.Assertions.*;
+
+import java.util.Collection;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedBlockingDeque;
+import java.util.concurrent.TimeUnit;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.data.redis.connection.RedisConnectionFactory;
+import org.springframework.data.redis.core.StringRedisTemplate;
+import org.springframework.data.redis.listener.ChannelTopic;
+import org.springframework.data.redis.listener.RedisMessageListenerContainer;
+import org.springframework.data.redis.listener.adapter.MessageListenerAdapter;
+import org.springframework.data.redis.serializer.StringRedisSerializer;
+
+/**
+ * Show usage of Redis Pub/Sub operations.
+ *
+ * @author Mark Paluch
+ */
+@SpringBootTest
+public class PubSubTests {
+
+	@Autowired RedisConnectionFactory connectionFactory;
+
+	@Autowired StringRedisTemplate redisTemplate;
+
+	@Test
+	void shouldListenToPubSubEvents() throws Exception {
+
+		BlockingQueue<String> events = new LinkedBlockingDeque<>();
+
+		RedisMessageListenerContainer container = new RedisMessageListenerContainer();
+		container.setConnectionFactory(connectionFactory);
+		container.afterPropertiesSet();
+		container.addMessageListener(
+				(message, pattern) -> events.add(String.format("%s@%s", new String(message.getBody()), new String(pattern))),
+				ChannelTopic.of("my-channel"));
+
+		container.start();
+
+		redisTemplate.convertAndSend("my-channel", "Hello, world!");
+
+		String event = events.poll(5, TimeUnit.SECONDS);
+
+		container.stop();
+		container.destroy();
+
+		assertThat(event).isEqualTo("Hello, world!@my-channel");
+	}
+
+	@Test
+	void shouldNotifyListener() throws Exception {
+
+		BlockingQueue<String> events = new LinkedBlockingDeque<>();
+
+		RedisMessageListenerContainer container = new RedisMessageListenerContainer();
+		container.setConnectionFactory(connectionFactory);
+		container.afterPropertiesSet();
+
+		MessageListenerAdapter messageListenerAdapter = new MessageListenerAdapter(new MyListener(events));
+		messageListenerAdapter.afterPropertiesSet();
+		messageListenerAdapter.setSerializer(StringRedisSerializer.UTF_8);
+		container.addMessageListener(messageListenerAdapter, ChannelTopic.of("my-channel"));
+
+		container.start();
+
+		redisTemplate.convertAndSend("my-channel", "Hello, world!");
+
+		String event = events.poll(5, TimeUnit.SECONDS);
+
+		container.stop();
+		container.destroy();
+
+		assertThat(event).isEqualTo("Hello, world!@my-channel");
+	}
+
+	static class MyListener {
+		private final Collection<String> events;
+
+		public MyListener(Collection<String> events) {
+			this.events = events;
+		}
+
+		public void handleMessage(String message, String channel) {
+			events.add(String.format("%s@%s", message, channel));
+		}
+	}
+}

redis/pubsub/src/test/java/example/springdata/redis/PubSubVirtualThreadsTests.java

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+/*
+ * Copyright 2023 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
+ *
+ *      http://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 example.springdata.redis;
+
+import static org.assertj.core.api.Assertions.*;
+
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedBlockingDeque;
+import java.util.concurrent.TimeUnit;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.EnabledOnJre;
+import org.junit.jupiter.api.condition.JRE;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.core.task.AsyncTaskExecutor;
+import org.springframework.data.redis.connection.RedisConnectionFactory;
+import org.springframework.data.redis.core.StringRedisTemplate;
+import org.springframework.data.redis.listener.ChannelTopic;
+import org.springframework.data.redis.listener.RedisMessageListenerContainer;
+
+/**
+ * Show usage of Redis Pub/Sub operations using Virtual Threads.
+ *
+ * @author Mark Paluch
+ */
+@SpringBootTest(properties = "spring.threads.virtual.enabled=true")
+@EnabledOnJre(JRE.JAVA_21)
+public class PubSubVirtualThreadsTests {
+
+	@Autowired RedisConnectionFactory connectionFactory;
+
+	@Autowired AsyncTaskExecutor taskExecutor;
+
+	@Autowired StringRedisTemplate redisTemplate;
+
+	@Test
+	void shouldListenToPubSubEvents() throws Exception {
+
+		BlockingQueue<String> events = new LinkedBlockingDeque<>();
+
+		RedisMessageListenerContainer container = new RedisMessageListenerContainer();
+		container.setConnectionFactory(connectionFactory);
+		container.setTaskExecutor(taskExecutor);
+		container.afterPropertiesSet();
+		container.addMessageListener(
+				(message, pattern) -> events
+						.add(String.format("%s on Thread %s", new String(message.getBody()), Thread.currentThread())),
+				ChannelTopic.of("my-channel"));
+
+		container.start();
+
+		redisTemplate.convertAndSend("my-channel", "Hello, world!");
+
+		String event = events.poll(5, TimeUnit.SECONDS);
+
+		container.stop();
+		container.destroy();
+
+		assertThat(event).isNotNull().contains("Hello, world!").contains("VirtualThread");
+	}
+}

redis/pubsub/src/test/java/example/springdata/redis/RedisTestConfiguration.java

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+/*
+ * Copyright 2014-2021 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 example.springdata.redis;
+
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * @author Mark Paluch
+ */
+@SpringBootApplication
+public class RedisTestConfiguration {}

redis/pubsub/src/test/resources/application.properties

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+logging.level.root=WARN