[waterflow] supports configuring uuid generator

Author: loveTsong

framework/waterflow/java/waterflow-core/src/main/java/modelengine/fit/waterflow/domain/utils/UUIDUtil.java

@@ -7,6 +7,7 @@
 package modelengine.fit.waterflow.domain.utils;
 
 import java.util.UUID;
+import java.util.function.Supplier;
 
 /**
  * Uuid的Utils类。
@@ -15,12 +16,25 @@
  * @since 1.0
  */
 public class UUIDUtil {
+    private static Supplier<String> uuidGenerator = () -> UUID.randomUUID().toString().replace("-", "");
     /**
      * 随机生成uuid。
      *
      * @return 随机生成的uuid的 {@link String}。
      */
     public static String uuid() {
-        return UUID.randomUUID().toString().replace("-", "");
+        return uuidGenerator.get();
+    }
+
+    /**
+     * 全局替换 uuid 的生成器。
+     *
+     * @param uuidGenerator 表示要设置的 uuid 生成器的 {@link Supplier}{@code <}{@link String}{@code >}。
+     * @return 表示设置前使用的 uuid 生成器的 {@link Supplier}{@code <}{@link String}{@code >}。
+     */
+    public static Supplier<String> setUuidGenerator(Supplier<String> uuidGenerator) {
+        Supplier<String> oldUuidGenerator = UUIDUtil.uuidGenerator;
+        UUIDUtil.uuidGenerator = uuidGenerator;
+        return oldUuidGenerator;
     }
 }

framework/waterflow/java/waterflow-core/src/test/java/modelengine/fit/waterflow/domain/utils/UUIDUtilTest.java

@@ -0,0 +1,31 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) 2025 Huawei Technologies Co., Ltd. All rights reserved.
+ *  This file is a part of the ModelEngine Project.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+package modelengine.fit.waterflow.domain.utils;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.Supplier;
+
+/**
+ * {@link UUIDUtil} 的测试。
+ *
+ * @author 宋永坦
+ * @since 2025-09-18
+ */
+class UUIDUtilTest {
+    @Test
+    void shouldGetIdWhenExecuteUuidGivenNewIdGenerator() {
+        AtomicInteger idBase = new AtomicInteger(1);
+        Supplier<String> oldGenerator = UUIDUtil.setUuidGenerator(() -> Integer.toString(idBase.getAndIncrement()));
+
+        Assertions.assertEquals("1", UUIDUtil.uuid());
+        Assertions.assertEquals("2", UUIDUtil.uuid());
+        Assertions.assertEquals(32, oldGenerator.get().length());
+    }
+}