Question

我创建了一个工作流，无论何时我从/content/dam/MyAsset文件夹上传或删除资产，我都可以触发JavaServices。我用Created Event Type和Removed Event Type创建了两个启动器。我需要在服务中获取该事件的类型和流程步骤名称或参数内部触发执行功能

这是我的代码：

public void execute(WorkItem arg0, WorkflowSession arg1, MetaDataMap arg2) 
                    throws WorkflowException 
{
    log.info("Workflow created ::::: ");    
}

有没有办法让Launcher事件类型和进程参数]服务？

Answer 1

您无法获取启动器事件类型，因为该信息未传递给工作流程。您可以做的是检查有效负载以确定节点是否存在。被删除的工作流程将包含已删除的节点的路径，如果您尝试解析该路径，它将为您提供异常（是的，糟糕的方法，但这是唯一的可能性）。

对于传递的流程步骤参数，所有这些信息都可在元数据中使用。查看arg0.getWorkflowData().getMetaDataMap().get("MyIDkey",<Type>);，其中arg0是您的WorkItem实例。

Answer 2

为什么不使用org.osgi.service.event.EventHandler？您将获得所需的所有信息。这是一个等待事件的小代码片段，并将相关数据添加到地图中，然后传递给JobManager以生成由匹配JobConsumer执行的新作业：

import org.apache.sling.event.jobs.Job;
import org.apache.sling.event.jobs.JobManager;
import org.apache.sling.event.jobs.consumer.JobConsumer;
// and more imports...
@Service
@Component(immediate = true, policy = ConfigurationPolicy.OPTIONAL, description = "Listen to page modification events.")
@Properties(value = { @Property(name = "event.topics", value = { PageEvent.EVENT_TOPIC, DamEvent.EVENT_TOPIC}, propertyPrivate = true),
                      @Property(name = JobConsumer.PROPERTY_TOPICS, value = ModificationEventHandler.JOB_TOPICS, propertyPrivate = true) })
public class ModificationEventHandler implements EventHandler, JobConsumer {
    /**
     * Modification Job Topics.
     */
    public static final String JOB_TOPICS = "de/rockware/aem/modification";

    @Reference
    private JobManager jobManager;

    @Override 
    public void handleEvent(Event event) {
        logger.trace("Checking event.");
        PageEvent pageEvent = PageEvent.fromEvent(event);
        DamEvent damEvent = DamEvent.fromEvent(event);
        Map<String, Object> properties = new HashMap<>();
        if (damEvent != null) {
          // DamEvent is not serializable, so we cannot add the complete event to the map.
          logger.trace("Event on {} is a dam event ({}).", damEvent.getAssetPath(), damEvent.getType().name());
          properties.put(DAM_EVENT_ASSET_PATH, damEvent.getAssetPath());
        }
        if (pageEvent != null) {
          logger.trace("Event is a page event.");
          properties.put(PAGE_EVENT, pageEvent);
        }
        logger.trace("Adding new job.");
        jobManager.addJob(JOB_TOPICS, properties);
      }

      @Override 
      public JobResult process(Job job) {
          if (job.getProperty(PAGE_EVENT) != null) {
              PageEvent pageEvent = (PageEvent) job.getProperty(PAGE_EVENT);
              if(pageEvent.isLocal()) {
                  Iterator<PageModification> modificationsIterator;
                  modificationsIterator = pageEvent.getModifications();
                  while (modificationsIterator.hasNext()) {
                      PageModification modification = modificationsIterator.next();
                      logger.info("Handling modification {} on path {}.", modification.getType(), modification.getPath());
                      if(isRelevantModification(modification.getType())) {
                          logger.info(modification.getPath());
                      }
                  }
              } else {
                  logger.trace("Page event is not local.");
              }
          } else if (job.getProperty(DAM_EVENT_ASSET_PATH) != null) {
              String assetPath = (String) job.getProperty(DAM_EVENT_ASSET_PATH);
              logger.trace(assetPath);
              backupService.trackModification(assetPath);
          } else {
              logger.trace("Invalid event type. Cannot help.");
          }
          return JobResult.OK;
      }
}

如何在AEM中获取Workflow事件类型和Processstep名称或Arguments到java服务？

2 个答案: