CAMEL-20187: Add basic support of virtual threads

Jenkinsfile.jdk21

@@ -43,6 +43,7 @@ pipeline {
 
     parameters {
         booleanParam(name: 'CLEAN', defaultValue: true, description: 'Perform the build in clean workspace')
+        booleanParam(name: 'VIRTUAL_THREAD', defaultValue: false, description: 'Perform the build using virtual threads')
     }
 
     stages {
@@ -73,7 +74,7 @@ pipeline {
         stage('Test') {
             steps {
                 timeout(unit: 'HOURS', time: 7) {
-                    sh "./mvnw $MAVEN_PARAMS $MAVEN_TEST_PARAMS -Darchetype.test.skip -Dmaven.test.failure.ignore=true -Dcheckstyle.skip=true verify"
+                    sh "./mvnw $MAVEN_PARAMS $MAVEN_TEST_PARAMS -Darchetype.test.skip -Dmaven.test.failure.ignore=true -Dcheckstyle.skip=true verify -Dcamel.threads.virtual.enabled=${params.VIRTUAL_THREAD}"
                 }
             }
             post {

core/camel-core/src/test/java/org/apache/camel/impl/DefaultExecutorServiceManagerTest.java

@@ -27,6 +27,7 @@
 import org.apache.camel.util.concurrent.ThreadPoolRejectedPolicy;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.DisabledIfSystemProperty;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
@@ -37,6 +38,8 @@
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+@DisabledIfSystemProperty(named = "camel.threads.virtual.enabled", matches = "true",
+                          disabledReason = "In case of Virtual Threads, ThreadPerTaskExecutor is created instead of ThreadPoolExecutor")
 public class DefaultExecutorServiceManagerTest extends ContextTestSupport {
 
     @Test

core/camel-core/src/test/java/org/apache/camel/processor/WireTapAbortPolicyTest.java

@@ -30,13 +30,16 @@
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.RepeatedTest;
+import org.junit.jupiter.api.condition.DisabledIfSystemProperty;
 import org.junit.jupiter.api.parallel.Isolated;
 
 import static org.junit.jupiter.api.Assertions.fail;
 
 /**
  * Wire tap unit test
  */
+@DisabledIfSystemProperty(named = "camel.threads.virtual.enabled", matches = "true",
+                          disabledReason = "Tasks are not rejected when using Virtual Threads")
 @Isolated
 public class WireTapAbortPolicyTest extends ContextTestSupport {
 

core/camel-core/src/test/java/org/apache/camel/processor/aggregator/AggregateTimeoutWithNoExecutorServiceTest.java

@@ -21,9 +21,12 @@
 import org.apache.camel.component.mock.MockEndpoint;
 import org.apache.camel.processor.aggregate.UseLatestAggregationStrategy;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.DisabledIfSystemProperty;
 
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+@DisabledIfSystemProperty(named = "camel.threads.virtual.enabled", matches = "true",
+                          disabledReason = "In case of Virtual Threads, the threads cannot be counted this way")
 public class AggregateTimeoutWithNoExecutorServiceTest extends ContextTestSupport {
 
     @Test

core/camel-management/src/test/java/org/apache/camel/management/DualManagedThreadPoolProfileTest.java

@@ -23,12 +23,15 @@
 import org.apache.camel.spi.ThreadPoolProfile;
 import org.apache.camel.util.concurrent.ThreadPoolRejectedPolicy;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.DisabledIfSystemProperty;
 import org.junit.jupiter.api.condition.DisabledOnOs;
 import org.junit.jupiter.api.condition.OS;
 
 import static org.apache.camel.management.DefaultManagementObjectNameStrategy.TYPE_THREAD_POOL;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
+@DisabledIfSystemProperty(named = "camel.threads.virtual.enabled", matches = "true",
+                          disabledReason = "In case of Virtual Threads, the created thread pools don't have all these attributes")
 @DisabledOnOs(OS.AIX)
 public class DualManagedThreadPoolProfileTest extends ManagementTestSupport {
 

core/camel-management/src/test/java/org/apache/camel/management/DualManagedThreadPoolWithIdTest.java

@@ -21,12 +21,15 @@
 
 import org.apache.camel.builder.RouteBuilder;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.DisabledIfSystemProperty;
 import org.junit.jupiter.api.condition.DisabledOnOs;
 import org.junit.jupiter.api.condition.OS;
 
 import static org.apache.camel.management.DefaultManagementObjectNameStrategy.TYPE_THREAD_POOL;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
+@DisabledIfSystemProperty(named = "camel.threads.virtual.enabled", matches = "true",
+                          disabledReason = "In case of Virtual Threads, the created thread pools don't have all these attributes")
 @DisabledOnOs(OS.AIX)
 public class DualManagedThreadPoolWithIdTest extends ManagementTestSupport {
 

core/camel-management/src/test/java/org/apache/camel/management/ManagedRouteRemoveWireTapTest.java

@@ -24,6 +24,7 @@
 import org.apache.camel.ServiceStatus;
 import org.apache.camel.builder.RouteBuilder;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.DisabledIfSystemProperty;
 import org.junit.jupiter.api.condition.DisabledOnOs;
 import org.junit.jupiter.api.condition.OS;
 
@@ -32,6 +33,8 @@
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+@DisabledIfSystemProperty(named = "camel.threads.virtual.enabled", matches = "true",
+                          disabledReason = "In case of Virtual Threads, the thread pools are not ThreadPoolExecutor")
 @DisabledOnOs(OS.AIX)
 public class ManagedRouteRemoveWireTapTest extends ManagementTestSupport {
 

core/camel-management/src/test/java/org/apache/camel/management/ManagedThreadPoolProfileTest.java

@@ -23,13 +23,16 @@
 import org.apache.camel.spi.ThreadPoolProfile;
 import org.apache.camel.util.concurrent.ThreadPoolRejectedPolicy;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.DisabledIfSystemProperty;
 import org.junit.jupiter.api.condition.DisabledOnOs;
 import org.junit.jupiter.api.condition.OS;
 
 import static org.apache.camel.management.DefaultManagementObjectNameStrategy.TYPE_THREAD_POOL;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+@DisabledIfSystemProperty(named = "camel.threads.virtual.enabled", matches = "true",
+                          disabledReason = "In case of Virtual Threads, the created thread pools don't have all these attributes")
 @DisabledOnOs(OS.AIX)
 public class ManagedThreadPoolProfileTest extends ManagementTestSupport {
 

core/camel-management/src/test/java/org/apache/camel/management/ManagedThreadPoolTest.java

@@ -28,12 +28,15 @@
 import org.apache.camel.builder.RouteBuilder;
 import org.awaitility.Awaitility;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.DisabledIfSystemProperty;
 import org.junit.jupiter.api.condition.DisabledOnOs;
 import org.junit.jupiter.api.condition.OS;
 
 import static org.apache.camel.management.DefaultManagementObjectNameStrategy.TYPE_THREAD_POOL;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
+@DisabledIfSystemProperty(named = "camel.threads.virtual.enabled", matches = "true",
+                          disabledReason = "In case of Virtual Threads, the created thread pools don't have all these attributes")
 @DisabledOnOs(OS.AIX)
 public class ManagedThreadPoolTest extends ManagementTestSupport {
 

core/camel-management/src/test/java/org/apache/camel/management/ManagedThreadPoolWithIdTest.java

@@ -21,12 +21,15 @@
 
 import org.apache.camel.builder.RouteBuilder;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.DisabledIfSystemProperty;
 import org.junit.jupiter.api.condition.DisabledOnOs;
 import org.junit.jupiter.api.condition.OS;
 
 import static org.apache.camel.management.DefaultManagementObjectNameStrategy.TYPE_THREAD_POOL;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
+@DisabledIfSystemProperty(named = "camel.threads.virtual.enabled", matches = "true",
+                          disabledReason = "In case of Virtual Threads, the created thread pools don't have all these attributes")
 @DisabledOnOs(OS.AIX)
 public class ManagedThreadPoolWithIdTest extends ManagementTestSupport {
 

core/camel-support/pom.xml

@@ -85,4 +85,53 @@
         </dependency>
     </dependencies>
 
+    <profiles>
+        <profile>
+            <id>java-21-sources</id>
+            <activation>
+                <jdk>[21,)</jdk>
+            </activation>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-compiler-plugin</artifactId>
+                        <version>${maven-compiler-plugin-version}</version>
+                        <executions>
+                            <execution>
+                                <id>default-compile</id>
+                                <phase>compile</phase>
+                                <goals>
+                                    <goal>compile</goal>
+                                </goals>
+                            </execution>
+                            <execution>
+                                <id>compile-java-21</id>
+                                <phase>compile</phase>
+                                <goals>
+                                    <goal>compile</goal>
+                                </goals>
+                                <configuration>
+                                    <release>21</release>
+                                    <compileSourceRoots>${project.basedir}/src/main/java21</compileSourceRoots>
+                                    <multiReleaseOutput>true</multiReleaseOutput>
+                                </configuration>
+                            </execution>
+                        </executions>
+                    </plugin>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-jar-plugin</artifactId>
+                        <configuration>
+                            <archive>
+                                <manifestEntries>
+                                    <Multi-Release>true</Multi-Release>
+                                </manifestEntries>
+                            </archive>
+                        </configuration>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+    </profiles>
 </project>