Flowable源码注释（十三）事件调度器测试类（上）

最新推荐文章于 2025-05-03 10:57:41 发布

翻译最新推荐文章于 2025-05-03 10:57:41 发布 · 310 阅读

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原文链接：https://github.com/flowable/flowable-engine

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该博客主要介绍了Flowable事件调度器的测试用例。首先，创建了一个FlowableEventDispatcher实例，然后添加了一个监听器并发送了不同类型的事件，验证了监听器能否正确接收和过滤事件。测试包括添加监听器接收所有事件、指定类型事件以及空类型事件的情况，并检查了移除监听器后不再接收事件的逻辑。

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Flowable源码地址：https://github.com/flowable/flowable-engine

包路径：org.flowable.engine.test.api.event

FlowableEventDispatcherTest Flowable事件调度器测试类

/**
 * @author Frederik Heremans
 */
public class FlowableEventDispatcherTest extends PluggableFlowableTestCase {

    protected FlowableEventDispatcher dispatcher;

    @BeforeEach
    protected void setUp() throws Exception {

        dispatcher = new FlowableEventDispatcherImpl();
    }

    /**
     * 测试添加监听器并检查是否向其发送了事件，还检查删除后是否未收到任何事件.
     */
    @Test
    public void testAddAndRemoveEventListenerAllEvents() throws Exception {
        // 创建一个只将事件添加到列表的监听器
        TestFlowableEventListener newListener = new TestFlowableEventListener();

        // 将事件监听器添加到调度程序
        dispatcher.addEventListener(newListener);

        TaskServiceConfiguration taskServiceConfiguration = (TaskServiceConfiguration) processEngineConfiguration.getServiceConfigurations()
                .get(EngineConfigurationConstants.KEY_TASK_SERVICE_CONFIG);
        FlowableEntityEventImpl event1 = new FlowableEntityEventImpl(taskServiceConfiguration.getTaskEntityManager().create(),
                FlowableEngineEventType.ENTITY_CREATED);
        FlowableEntityEventImpl event2 = new FlowableEntityEventImpl(taskServiceConfiguration.getTaskEntityManager().create(),
                FlowableEngineEventType.ENTITY_CREATED);

        // 调度事件
        dispatcher.dispatchEvent(event1, processEngineConfiguration.getEngineCfgKey());
        dispatcher.dispatchEvent(event2, processEngineConfiguration.getEngineCfgKey());

        assertThat(newListener.getEventsReceived()).hasSize(2);
        assertThat(newListener.getEventsReceived().get(0)).isEqualTo(event1);
        assertThat(newListener.getEventsReceived().get(1)).isEqualTo(event2);

        // 删除监听器并再次分派事件，不应调用监听器
        dispatcher.removeEventListener(newListener);
        newListener.clearEventsReceived();
        dispatcher.dispatchEvent(event1, processEngineConfiguration.getEngineCfgKey());
        dispatcher.dispatchEvent(event2, processEngineConfiguration.getEngineCfgKey());

        assertThat(newListener.getEventsReceived()).isEmpty();
    }

    /**
     * 测试添加一个监听器，并检查是否向它发送了事件，以及它注册的类型。还检查删除后是否未收到任何事件.
     */
    @Test
    public void testAddAndRemoveEventListenerTyped() throws Exception {
        // 创建一个只将事件添加到列表的监听器
        TestFlowableEventListener newListener = new TestFlowableEventListener();

        // 将事件监听器添加到调度程序
        dispatcher.addEventListener(newListener, FlowableEngineEventType.ENTITY_CREATED, FlowableEngineEventType.ENTITY_DELETED);

        TaskServiceConfiguration taskServiceConfiguration = (TaskServiceConfiguration) processEngineConfiguration.getServiceConfigurations()
                .get(EngineConfigurationConstants.KEY_TASK_SERVICE_CONFIG);
        FlowableEntityEventImpl event1 = new FlowableEntityEventImpl(taskServiceConfiguration.getTaskEntityManager().create(),
                FlowableEngineEventType.ENTITY_CREATED);
        FlowableEntityEventImpl event2 = new FlowableEntityEventImpl(taskServiceConfiguration.getTaskEntityManager().create(),
                FlowableEngineEventType.ENTITY_DELETED);
        FlowableEntityEventImpl event3 = new FlowableEntityEventImpl(taskServiceConfiguration.getTaskEntityManager().create(),
                FlowableEngineEventType.ENTITY_UPDATED);

        // 分派事件，三分之二的事件应该已经进入监听器
        dispatcher.dispatchEvent(event1, processEngineConfiguration.getEngineCfgKey());
        dispatcher.dispatchEvent(event2, processEngineConfiguration.getEngineCfgKey());
        dispatcher.dispatchEvent(event3, processEngineConfiguration.getEngineCfgKey());

        assertThat(newListener.getEventsReceived()).hasSize(2);
        assertThat(newListener.getEventsReceived().get(0)).isEqualTo(event1);
        assertThat(newListener.getEventsReceived().get(1)).isEqualTo(event2);

        // 删除监听器并再次分派事件，不应调用监听器
        dispatcher.removeEventListener(newListener);
        newListener.clearEventsReceived();
        dispatcher.dispatchEvent(event1, processEngineConfiguration.getEngineCfgKey());
        dispatcher.dispatchEvent(event2, processEngineConfiguration.getEngineCfgKey());

        assertThat(newListener.getEventsReceived()).isEmpty();
    }

    /**
     * 测试是否从未调用添加空类型的监听器。
     */
    @Test
    public void testAddAndRemoveEventListenerTypedNullType() throws Exception {

        // 创建一个只将事件添加到列表的监听器
        TestFlowableEventListener newListener = new TestFlowableEventListener();

        // 将事件监听器添加到调度程序
        dispatcher.addEventListener(newListener, (FlowableEngineEventType) null);

        TaskServiceConfiguration taskServiceConfiguration = (TaskServiceConfiguration) processEngineConfiguration.getServiceConfigurations()
                .get(EngineConfigurationConstants.KEY_TASK_SERVICE_CONFIG);
        FlowableEntityEventImpl event1 = new FlowableEntityEventImpl(taskServiceConfiguration.getTaskEntityManager().create(),
                FlowableEngineEventType.ENTITY_CREATED);
        FlowableEntityEventImpl event2 = new FlowableEntityEventImpl(taskServiceConfiguration.getTaskEntityManager().create(),
                FlowableEngineEventType.ENTITY_DELETED);

        // 分派事件时，所有事件都应该已进入监听器
        dispatcher.dispatchEvent(event1, processEngineConfiguration.getEngineCfgKey());
        dispatcher.dispatchEvent(event2, processEngineConfiguration.getEngineCfgKey());

        assertThat(newListener.getEventsReceived()).isEmpty();
    }
	
    ...
   
}