Ways to improve development efficiency: Use Java workflow framework

How to use the Java workflow framework to improve development efficiency

Introduction:
In the software development process, workflow (Workflow) refers to a series of related A collection of tasks, activities, or steps. In practical applications, workflow can be used to coordinate and manage some systems with complex business logic. In order to improve development efficiency, developers can use the Java workflow framework to simplify the workflow design and implementation process. This article will introduce some commonly used Java workflow frameworks and show how to use these frameworks to improve development efficiency through specific code examples.

1. Activiti workflow engine
Activiti is an open source BPMN 2.0 (Business Process Model and Notation) workflow engine. It provides a set of Java API and Web console that can be used for design , deploy and execute workflows. The following is a simple example using Activiti:

1. Introduce dependencies:

   <dependency>
    <groupId>org.activiti</groupId>
    <artifactId>activiti-engine</artifactId>
    <version>7.1.0</version>
   </dependency>

2. Create a workflow engine:

   ProcessEngineConfiguration processEngineConfiguration = ProcessEngineConfiguration.createStandaloneInMemProcessEngineConfiguration();
   ProcessEngine processEngine = processEngineConfiguration.buildProcessEngine();

3. Deployment workflow definition:

   RepositoryService repositoryService = processEngine.getRepositoryService();
   Deployment deployment = repositoryService.createDeployment()
        .addClasspathResource("myProcess.bpmn")
        .addClasspathResource("myProcess.png")
        .deploy();

4. Start workflow instance:

   RuntimeService runtimeService = processEngine.getRuntimeService();
   ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("myProcess");

5. Execute task:

   TaskService taskService = processEngine.getTaskService();
   List<Task> tasks = taskService.createTaskQuery().taskAssignee("user").list();
   for (Task task : tasks) {
    taskService.complete(task.getId());
   }

2. JBPM workflow engine
JBPM is a mature and powerful Java workflow engine. It uses a combination of rule engine and process engine to realize complex workflow scenarios. The following is a simple example of using JBPM:

1. Introduce dependencies:

   <dependency>
    <groupId>org.jbpm</groupId>
    <artifactId>jbpm-bom</artifactId>
    <version>7.45.0.Final</version>
    <type>pom</type>
    <scope>import</scope>
   </dependency>

2. Create a workflow engine:

   KieServices kieServices = KieServices.Factory.get();
   KieContainer kieContainer = kieServices.getKieClasspathContainer();
   KieSession kieSession = kieContainer.newKieSession();

3. Deployment workflow definition:

   KieRepository kieRepository = kieServices.getRepository();
   KieFileSystem kieFileSystem = kieServices.newKieFileSystem();
   Resource resource = kieServices.getResources().newClassPathResource("myProcess.bpmn");
   kieFileSystem.write("myProcess.bpmn", resource);
   KieBuilder kieBuilder = kieServices.newKieBuilder(kieFileSystem);
   kieBuilder.buildAll();
   KieModule kieModule = kieBuilder.getKieModule();
   kieRepository.addKieModule(kieModule);

4. Start workflow instance:

   ProcessInstance processInstance = kieSession.startProcess("myProcess");

5. Execute task:

   List<TaskSummary> tasks = runtimeEngine.getTaskService().getTasksAssignedAsPotentialOwner("user", "en-UK");
   for (TaskSummary task : tasks) {
    runtimeEngine.getTaskService().start(task.getId(), "user");
    runtimeEngine.getTaskService().complete(task.getId(), "user", null);
   }

Summary:
By using the Java workflow framework, developers can simplify the workflow design and implementation process and improve development efficiency. By introducing Activiti and JBPM, two commonly used workflow engines, as well as corresponding specific code examples, this article hopes to help readers better understand how to use the Java workflow framework to improve development efficiency. Of course, in addition to these two frameworks, there are many other Java workflow frameworks to choose from, and readers can choose the appropriate framework according to their own needs.

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