feat: enable virtual threads

Author: nicklatch

pom.xml

@@ -72,6 +72,17 @@
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-maven-plugin</artifactId>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration>
+          <source>22</source>
+          <target>22</target>
+          <compilerArgs>
+            --enable-preview
+          </compilerArgs>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
 

src/main/java/dev/nicklatcham/shopthing/config/ThreadConfig.java

@@ -0,0 +1,31 @@
+package dev.nicklatcham.shopthing.config;
+
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.web.embedded.tomcat.TomcatProtocolHandlerCustomizer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.task.AsyncTaskExecutor;
+import org.springframework.core.task.support.TaskExecutorAdapter;
+import org.springframework.scheduling.annotation.EnableAsync;
+import java.util.concurrent.Executors;
+
+@EnableAsync
+@Configuration
+@ConditionalOnProperty(
+    value = "spring.thread-executor",
+    havingValue = "virtual"
+)
+public class ThreadConfig {
+
+  @Bean
+  public AsyncTaskExecutor applicationTaskExecutor() {
+    return new TaskExecutorAdapter(Executors.newVirtualThreadPerTaskExecutor());
+  }
+
+  @Bean
+  public TomcatProtocolHandlerCustomizer<?> protocolHandlerVirtualThreadExecutorCustomizer() {
+    return protocolHandler -> {
+      protocolHandler.setExecutor(Executors.newVirtualThreadPerTaskExecutor());
+    };
+  }
+}

src/main/resources/application.properties

@@ -1,2 +1,5 @@
 spring.application.name=shopthing
-spring.datasource.url=jdbc:h2:mem:shopthingdev
+spring.datasource.url=jdbc:h2:mem:shopthingdev
+
+spring.threads.virtual.enabled=true
+spring.thread-executor=virtual