Flowable-Engine流程实例迁移API：版本升级的无缝过渡

Flowable-Engine流程实例迁移API：版本升级的无缝过渡

【免费下载链接】flowable-engine A compact and highly efficient workflow and Business Process Management (BPM) platform for developers, system admins and business users. 项目地址: https://gitcode.com/GitHub_Trending/fl/flowable-engine

痛点与解决方案

企业在使用Flowable-Engine进行业务流程管理时，随着业务需求的变化，经常需要对流程定义进行更新。然而，直接升级流程定义可能导致正在运行的流程实例出现异常，甚至中断业务。Flowable-Engine提供的流程实例迁移API解决了这一痛点，实现了版本升级的无缝过渡。

核心API介绍

ProcessMigrationService

ProcessMigrationService是流程实例迁移的核心服务接口，提供了创建流程实例迁移构建器、验证迁移以及执行迁移等功能。其主要方法包括：

• createProcessInstanceMigrationBuilder()：创建流程实例迁移构建器
• validateMigrationForProcessInstance()：验证单个流程实例的迁移
• migrateProcessInstance()：执行单个流程实例的迁移
• batchMigrateProcessInstancesOfProcessDefinition()：批量迁移流程实例

详细代码可参考modules/flowable-engine/src/main/java/org/flowable/engine/ProcessMigrationService.java

ProcessInstanceMigrationBuilder

ProcessInstanceMigrationBuilder用于构建流程实例迁移计划，支持指定目标流程定义、添加活动映射、设置迁移前后的脚本或委托等。主要方法包括：

• migrateToProcessDefinition()：指定目标流程定义
• addActivityMigrationMapping()：添加活动映射
• preUpgradeScript()：设置迁移前执行的脚本
• postUpgradeScript()：设置迁移后执行的脚本

详细代码可参考modules/flowable-engine/src/main/java/org/flowable/engine/migration/ProcessInstanceMigrationBuilder.java

迁移流程

1. 创建迁移构建器

ProcessMigrationService processMigrationService = processEngine.getProcessMigrationService();
ProcessInstanceMigrationBuilder migrationBuilder = processMigrationService.createProcessInstanceMigrationBuilder();

2. 配置目标流程定义

migrationBuilder.migrateToProcessDefinition(targetProcessDefinitionId);

或

migrationBuilder.migrateToProcessDefinition(processDefinitionKey, processDefinitionVersion, processDefinitionTenantId);

3. 添加活动映射（可选）

ActivityMigrationMapping mapping = new ActivityMigrationMapping();
mapping.setSourceActivityId("oldActivityId");
mapping.setTargetActivityId("newActivityId");
migrationBuilder.addActivityMigrationMapping(mapping);

4. 设置迁移前后脚本（可选）

Script preScript = new Script();
preScript.setScript("println 'Before migration'");
preScript.setScriptLanguage("groovy");
migrationBuilder.preUpgradeScript(preScript);

Script postScript = new Script();
postScript.setScript("println 'After migration'");
postScript.setScriptLanguage("groovy");
migrationBuilder.postUpgradeScript(postScript);

5. 验证迁移

ProcessInstanceMigrationValidationResult validationResult = migrationBuilder.validateMigration(processInstanceId);
if (validationResult.isValid()) {
    // 迁移验证通过
} else {
    // 处理验证失败
}

6. 执行迁移

migrationBuilder.migrate(processInstanceId);

7. 批量迁移

Batch batch = processMigrationService.batchMigrateProcessInstancesOfProcessDefinition(processDefinitionId, migrationBuilder.getProcessInstanceMigrationDocument());

迁移案例

以下是一个完整的流程实例迁移示例，将流程实例从旧版本迁移到新版本：

// 获取流程迁移服务
ProcessMigrationService processMigrationService = processEngine.getProcessMigrationService();

// 创建迁移构建器
ProcessInstanceMigrationBuilder migrationBuilder = processMigrationService.createProcessInstanceMigrationBuilder();

// 配置目标流程定义
migrationBuilder.migrateToProcessDefinition(targetProcessDefinitionId);

// 添加活动映射
ActivityMigrationMapping mapping = new ActivityMigrationMapping();
mapping.setSourceActivityId("oldTask");
mapping.setTargetActivityId("newTask");
migrationBuilder.addActivityMigrationMapping(mapping);

// 设置迁移前后脚本
Script preScript = new Script();
preScript.setScript("execution.setVariable('migrationTime', new Date())");
preScript.setScriptLanguage("groovy");
migrationBuilder.preUpgradeScript(preScript);

// 验证迁移
ProcessInstanceMigrationValidationResult validationResult = migrationBuilder.validateMigration(processInstanceId);
if (validationResult.isValid()) {
    // 执行迁移
    migrationBuilder.migrate(processInstanceId);
    System.out.println("流程实例迁移成功");
} else {
    System.out.println("流程实例迁移验证失败: " + validationResult.getValidationMessages());
}

详细测试案例可参考modules/flowable-engine/src/test/java/org/flowable/engine/test/api/runtime/migration/ProcessInstanceMigrationBatchTest.java

注意事项

1. 迁移前务必进行验证，确保迁移计划的正确性
2. 对于复杂流程，建议先进行小范围测试，再进行批量迁移
3. 迁移过程中可能需要处理流程变量的转换，可通过preUpgradeScript和postUpgradeScript实现
4. 批量迁移时，可通过Batch对象跟踪迁移进度和结果

总结

Flowable-Engine的流程实例迁移API为企业提供了一种安全、高效的流程版本升级方案。通过本文介绍的API和迁移流程，您可以轻松实现流程实例的无缝迁移，确保业务的连续性和稳定性。

更多详细信息可参考官方文档：docs/docusaurus/docs/oss-introduction.md

【免费下载链接】flowable-engine A compact and highly efficient workflow and Business Process Management (BPM) platform for developers, system admins and business users. 项目地址: https://gitcode.com/GitHub_Trending/fl/flowable-engine