1. update sofa-common-tools 1.3.15

2. add SofaVirtualThreadFactory api for low java version sdk

src/main/java/com/alipay/sofa/common/thread/virtual/SofaVirtualThreadFactory.java

@@ -0,0 +1,88 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 com.alipay.sofa.common.thread.virtual;
+
+import java.util.concurrent.ExecutorService;
+
+/**
+ * Delegate for virtual thread handling on JDK 21.
+ * This is a dummy version for reachability on JDK less than 21.
+ *
+ * @author huzijie
+ * @version SofaVirtualThreadFactory.java, v 0.1 2023年11月20日 3:57 PM huzijie Exp $
+ */
+public class SofaVirtualThreadFactory {
+
+    /**
+     * Create a virtual thread with name.
+     *
+     * @param name thread name
+     * @param runnable task to run with thread
+     * @return a virtual thread with runnable
+     * @since 2.1.0
+     */
+    public static Thread ofThread(String name, Runnable runnable) {
+        throw new UnsupportedOperationException("Virtual threads not supported on JDK <21");
+    }
+
+    /**
+     * Create a virtual thread with name.
+     *
+     * @param name thread name
+     * @param inheritInheritableThreadLocals {@code true} to inherit, {@code false} to not inherit
+     * @param uncaughtExceptionHandler uncaught exception handler
+     * @param runnable task to run with thread
+     * @return a virtual thread with runnable
+     * @since 2.1.0
+     */
+
+    public static Thread ofThread(String name, boolean inheritInheritableThreadLocals,
+                                  Thread.UncaughtExceptionHandler uncaughtExceptionHandler,
+                                  Runnable runnable) {
+        throw new UnsupportedOperationException("Virtual threads not supported on JDK <21");
+    }
+
+    /**
+     * Creates an Executor that starts a new virtual Thread for each task.
+     * The number of threads created by the Executor is unbounded.
+     *
+     * @param prefix thread prefix
+     * @return a new executor that creates a new virtual Thread for each task
+     * @since 2.1.0
+     */
+    public static ExecutorService ofExecutorService(String prefix) {
+        throw new UnsupportedOperationException("Virtual threads not supported on JDK <21");
+    }
+
+    /**
+     * Creates an Executor that starts a new virtual Thread for each task.
+     * The number of threads created by the Executor is unbounded.
+     *
+     * @param prefix thread prefix
+     * @param start the starting value of the counter
+     * @param inheritInheritableThreadLocals {@code true} to inherit, {@code false} to not inherit
+     * @param uncaughtExceptionHandler uncaught exception handler
+     * @return a new executor that creates a new virtual Thread for each task
+     * @since 2.1.0
+     */
+    public static ExecutorService ofExecutorService(String prefix,
+                                                    long start,
+                                                    boolean inheritInheritableThreadLocals,
+                                                    Thread.UncaughtExceptionHandler uncaughtExceptionHandler) {
+        throw new UnsupportedOperationException("Virtual threads not supported on JDK <21");
+    }
+}