以编程方式与工作流交互

在自定义和扩展工作流时，您可以访问工作流对象：

• 使用工作流Java API
• 在ECMA脚本中获取工作流对象
• 使用工作流REST API

使用工作流Java API

工作流Java API由com.adobe.granite.workflow包和多个子包组成。 API最重要的成员是com.adobe.granite.workflow.WorkflowSession类。 WorkflowSession类提供对设计时和运行时工作流对象的访问：

• 工作流模型
• 工作项
• 工作流实例
• 工作流数据
• 收件箱项目

类还提供了几种用于干预工作流生命周期的方法。

下表提供了在以编程方式与工作流交互时要使用的几个关键Java对象的参考文档的链接。 以下示例演示了如何在代码中获取和使用类对象。

在ECMA脚本中获取工作流对象

如查找脚本中所述， AEM（通过Apache Sling）提供了一个可执行服务器端ECMA脚本的ECMA脚本引擎。 org.apache.sling.scripting.core.ScriptHelper类可作为sling变量立即在脚本中使用。

ScriptHelper类提供对SlingHttpServletRequest的访问权限，您可以使用最终获取WorkflowSession对象；例如：

var wfsession = sling.getRequest().getResource().getResourceResolver().adaptTo(Packages.com.adobe.granite.workflow.WorkflowSession);

使用工作流REST API

工作流控制台充分利用了REST API;因此，本页介绍了工作流的REST API。

REST API支持以下操作：

• 启动或停止工作流服务
• 创建、更新或删除工作流模型
• 启动、暂停、继续或终止工作流实例
• 完成或委派工作项

在本页中，假定AEM在端口4502的本地主机上运行，并且安装上下文为“ /”（根）。 如果安装的URI不是，则需要相应地调整HTTP请求所适用的URI。

GET请求支持的渲染是JSON渲染。 GET的URL应具有.json扩展名，例如：

http://localhost:4502/etc/workflow.json

管理工作流实例

以下HTTP请求方法适用于：

http://localhost:4502/etc/workflow/instances

按状态管理工作流实例

以下HTTP请求方法适用于：

http://localhost:4502/etc/workflow/instances.{state}

通过工作流实例的ID管理该实例

以下HTTP请求方法适用于：

http://localhost:4502/etc/workflow/instances/{id}

管理工作流模型

以下HTTP请求方法适用于：

http://localhost:4502/etc/workflow/models

示例：在浏览器中，对http://localhost:4502/etc/workflow/models.json的请求会生成与以下内容类似的json响应：

[
    {"uri":"/var/workflow/models/activationmodel"}
    ,{"uri":"/var/workflow/models/dam/adddamsize"}
    ,{"uri":"/var/workflow/models/cloudconfigs/dtm-reactor/library-download"}
    ,{"uri":"/var/workflow/models/ac-newsletter-workflow-simple"}
    ,{"uri":"/var/workflow/models/dam/dam-create-language-copy"}
    ,{"uri":"/var/workflow/models/dam/dam-create-and-translate-language-copy"}
    ,{"uri":"/var/workflow/models/dam-indesign-proxy"}
    ,{"uri":"/var/workflow/models/dam-xmp-writeback"}
    ,{"uri":"/var/workflow/models/dam-parse-word-documents"}
    ,{"uri":"/var/workflow/models/dam/process_subasset"}
    ,{"uri":"/var/workflow/models/dam/dam_set_last_modified"}
    ,{"uri":"/var/workflow/models/dam/dam-autotag-assets"}
    ,{"uri":"/var/workflow/models/dam/update_asset"}
    ,{"uri":"/var/workflow/models/dam/update_asset_offloading"}
    ,{"uri":"/var/workflow/models/dam/dam-update-language-copy"}
    ,{"uri":"/var/workflow/models/dam/update_from_lightbox"}
    ,{"uri":"/var/workflow/models/cloudservices/DTM_bundle_download"}
    ,{"uri":"/var/workflow/models/dam/dam_download_asset"}
    ,{"uri":"/var/workflow/models/dam/dynamic-media-encode-video"}
    ,{"uri":"/var/workflow/models/dam/dynamic-media-video-thumbnail-replacement"}
    ,{"uri":"/var/workflow/models/dam/dynamic-media-video-user-uploaded-thumbnail"}
    ,{"uri":"/var/workflow/models/newsletter_bounce_check"}
    ,{"uri":"/var/workflow/models/projects/photo_shoot_submission"}
    ,{"uri":"/var/workflow/models/projects/product_photo_shoot"}
    ,{"uri":"/var/workflow/models/projects/approval_workflow"}
    ,{"uri":"/var/workflow/models/prototype-01"}
    ,{"uri":"/var/workflow/models/publish_example"}
    ,{"uri":"/var/workflow/models/publish_to_campaign"}
    ,{"uri":"/var/workflow/models/screens/publish_to_author_bin"}
    ,{"uri":"/var/workflow/models/s7dam/request_to_publish_to_youtube"}
    ,{"uri":"/var/workflow/models/projects/request_copy"}
    ,{"uri":"/var/workflow/models/projects/request_email"}
    ,{"uri":"/var/workflow/models/projects/request_landing_page"}
    ,{"uri":"/var/workflow/models/projects/request_launch"}
    ,{"uri":"/var/workflow/models/request_for_activation"}
    ,{"uri":"/var/workflow/models/request_for_deactivation"}
    ,{"uri":"/var/workflow/models/request_for_deletion"}
    ,{"uri":"/var/workflow/models/request_for_deletion_without_deactivation"}
    ,{"uri":"/var/workflow/models/request_to_complete_move_operation"}
    ,{"uri":"/var/workflow/models/reverse_replication"}
    ,{"uri":"/var/workflow/models/salesforce-com-export"}
    ,{"uri":"/var/workflow/models/scene7"}
    ,{"uri":"/var/workflow/models/scheduled_activation"}
    ,{"uri":"/var/workflow/models/scheduled_deactivation"}
    ,{"uri":"/var/workflow/models/screens/screens-update-asset"}
    ,{"uri":"/var/workflow/models/translation"}
    ,{"uri":"/var/workflow/models/s7dam/request_to_remove_from_youtube"}
    ,{"uri":"/var/workflow/models/wcm-translation/create_language_copy"}
    ,{"uri":"/var/workflow/models/wcm-translation/prepare_translation_project"}
    ,{"uri":"/var/workflow/models/wcm-translation/translate-i18n-dictionary"}
    ,{"uri":"/var/workflow/models/wcm-translation/sync_translation_job"}
    ,{"uri":"/var/workflow/models/wcm-translation/translate-language-copy"}
    ,{"uri":"/var/workflow/models/wcm-translation/update_language_copy"}
]

管理特定的工作流模型

以下HTTP请求方法适用于：

http://localhost:4502*{uri}*

其中*{uri}*是存储库中模型节点的路径。

示例：在浏览器中，对http://localhost:4502/var/workflow/models/publish_example.json的请求会返回与以下代码类似的json响应：

{
  "id":"/var/workflow/models/publish_example",
  "title":"Publish Example",
  "version":"1.0",
  "description":"This example shows a simple review and publish process.",
  "metaData": 
  {
    "multiResourceSupport":"true",
    "tags":"wcm,publish"
  },
  "nodes":
  [{
    "id":"node0",
    "type":"START",
    "title":"Start",
    "description":"The start node of the workflow.",
    "metaData":
    {
    }
  },
  {
    "id":"node1",
    "type":"PARTICIPANT",
    "title":"Validate Content",
    "description":"Validate the modified content.",
    "metaData":
    {
      "PARTICIPANT":"admin"
    }
  },
  {
    "id":"node2",
    "type":"PROCESS",
    "title":"Publish Content",
    "description":"Publish the modified content.",
    "metaData":
    {
      "PROCESS_AUTO_ADVANCE":"true",
      "PROCESS":"com.day.cq.wcm.workflow.process.ActivatePageProcess"
    }
  },
  {
    "id":"node3",
    "type":"END",
    "title":"End",
    "description":"The end node of the workflow.",
    "metaData":
    {
    }
  }],
  "transitions":
  [{
    "from":"node0",
    "to":"node1",
    "metaData":
    {
    }
  },
  {
    "from":"node1",
    "to":"node2",
    "metaData":
    {
    }
  },
  {
    "from":"node2",
    "to":"node3",
    "metaData":
    {
    }
  }
]}

按版本管理工作流模型

以下HTTP请求方法适用于：

http://localhost:4502/etc/workflow/models/{id}.{version}

管理（用户）收件箱

以下HTTP请求方法适用于：

http://localhost:4502/bin/workflow/inbox

通过WorkItem ID管理（用户）收件箱

以下HTTP请求方法适用于：

http://localhost:4502/bin/workflow/inbox/{id}

示例

如何获取所有正在运行的工作流及其ID的列表

要获取所有正在运行的工作流的列表，请执行以下GET:

http://localhost:4502/etc/workflow/instances.RUNNING.json

如何获取所有正在运行的工作流及其ID的列表 — 使用curl的REST

使用curl的示例：

curl -u admin:admin http://localhost:4502/etc/workflow/instances.RUNNING.json

结果中显示的uri可用作其他命令中的实例id;例如：

[
    {"uri":"/etc/workflow/instances/server0/2017-03-08/request_for_activation_1"}
]

如何更改工作流标题

要更改工作流控制台的​实例​选项卡中显示的​工作流标题，请发送POST命令：

• 到: http://localhost:4502/etc/workflow/instances/{id}

• 使用以下参数：

  • action:其价值必须是： UPDATE
  • workflowTitle:工作流标题

如何使用curl更改工作流标题 — REST

使用curl的示例：

curl -u admin:admin -d "action=UPDATE&workflowTitle=myWorkflowTitle" http://localhost:4502/etc/workflow/instances/{id}

# for example
curl -u admin:admin -d "action=UPDATE&workflowTitle=myWorkflowTitle" http://localhost:4502/etc/workflow/instances/server0/2017-03-08/request_for_activation_1

如何列出所有工作流模型

要获取所有可用工作流模型的列表，请执行以下GET:

http://localhost:4502/etc/workflow/models.json

如何列出所有工作流模型 — 使用curl的REST

使用curl的示例：

curl -u admin:admin http://localhost:4502/etc/workflow/models.json

获取WorkflowSession对象

com.adobe.granite.workflow.WorkflowSession类可从javax.jcr.Session对象或org.apache.sling.api.resource.ResourceResolver对象进行修改。

获取WorkflowSession对象 — Java

在JSP脚本（或Servlet类的Java代码）中，使用HTTP请求对象获取SlingHttpServletRequest对象，该对象提供对ResourceResolver对象的访问。 将ResourceResolver对象调整为WorkflowSession。

<%
%><%@include file="/libs/foundation/global.jsp"%><%
%><%@page session="false" 
    import="com.adobe.granite.workflow.WorkflowSession,
  org.apache.sling.api.SlingHttpServletRequest"%><%

SlingHttpServletRequest slingReq = (SlingHttpServletRequest)request;
WorkflowSession wfSession = slingReq.getResourceResolver().adaptTo(WorkflowSession.class);
%>

获取WorkflowSession对象 — ECMA脚本

使用sling变量获取用于获取ResourceResolver对象的SlingHttpServletRequest对象。 将ResourceResolver对象调整为WorkflowSession对象。

var wfsession = sling.getRequest().getResource().getResourceResolver().adaptTo(Packages.com.adobe.granite.workflow.WorkflowSession);

创建、读取或删除工作流模型

以下示例显示如何访问工作流模型：

• Java和ECMA脚本的代码使用WorkflowSession.createNewModel方法。
• curl命令可直接使用其URL访问模型。

使用的示例：

1. 创建模型（ID为/var/workflow/models/mymodel/jcr:content/model）。
2. 删除模型。

创建新模型时：

• 工作流模型编辑器要求模型使用/var/workflow/models下的特定节点结构。 模型的父节点必须为具有jcr:content节点的cq:Page类型，且该节点具有以下属性值：

  • sling:resourceType: cq/workflow/components/pages/model
  • cq:template: /libs/cq/workflow/templates/model

  创建模型时，必须先创建此cq:Page节点，并将其jcr:content节点用作模型节点的父节点。

• 某些方法识别模型所需的id参数是存储库中模型节点的绝对路径：

  /var/workflow/models/<*model_name>*/jcr:content/model

  注意

  请参阅如何列出所有工作流模型。

创建、读取或删除工作流模型 — Java

<%@include file="/libs/foundation/global.jsp"%><%
%><%@page session="false" import="com.adobe.granite.workflow.WorkflowSession,
                 com.adobe.granite.workflow.model.WorkflowModel,
             org.apache.sling.api.SlingHttpServletRequest"%><%

SlingHttpServletRequest slingReq = (SlingHttpServletRequest)request;
WorkflowSession wfSession = slingReq.getResourceResolver().adaptTo(WorkflowSession.class);
/* Create the parent page */
String modelRepo = new String("/var/workflow/models");
String modelTemplate = new String ("/libs/cq/workflow/templates/model");
String modelName = new String("mymodel");
Page modelParent = pageManager.create(modelRepo, modelName, modelTemplate, "My workflow model");

/* create the model */
String modelId = new String(modelParent.getPath()+"/jcr:content/model")
WorkflowModel model = wfSession.createNewModel("Made using Java",modelId);

/* delete the model */
wfSession.deleteModel(modelId);
%>

创建、读取或删除工作流模型 — ECMA脚本

var resolver = sling.getRequest().getResource().getResourceResolver();
var wfSession = resolver.adaptTo(Packages.com.adobe.granite.workflow.WorkflowSession);
var pageManager = resolver.adaptTo(Packages.com.day.cq.wcm.api.PageManager);

//create the parent page node
var workflowPage = pageManager.create("/var/workflow/models", "mymodel", "/libs/cq/workflow/templates/model", "Created via ECMA Script");
var modelId = workflowPage.getPath()+ "/jcr:content/model";
//create the model
var model = wfSession.createNewModel("My Model", modelId);
//delete the model
var model = wfSession.deleteModel(modelId);

删除工作流模型 — 使用curl的REST

# deleting the model by its id
curl -u admin:admin -X DELETE http://localhost:4502/etc/workflow/models/{id}

检查工作流状态时筛选系统工作流

您可以使用WorkflowStatus API检索有关节点工作流状态的信息。

各种方法均具有参数：

excludeSystemWorkflows

此参数可设置为true，以指示应从相关结果中排除系统工作流。

您可以更新OSGi配置 AdobeGranite工作流负载MapCache，该配置指定要视为系统工作流的工作流Models。 默认（运行时）工作流模型包括：

• /var/workflow/models/scheduled_activation/jcr:content/model
• /var/workflow/models/scheduled_deactivation/jcr:content/model

超时后自动提前参与者步骤

如果需要自动前进在预定义时间内未完成的​参与者​步骤，您可以：

1. 实施OSGi事件侦听器以侦听任务创建和修改。

2. 指定超时（截止时间），然后创建一个计划的sling作业，以在该时触发。

3. 编写一个在超时过期时通知的作业处理程序并触发该作业。

   如果任务尚未完成，此处理程序将对任务执行所需的操作

与工作流实例交互

以下提供了如何与工作流实例进行交互（编程）的基本示例。

与工作流实例交互 — Java

// starting a workflow
WorkflowModel model = wfSession.getModel(workflowId);
WorkflowData wfData = wfSession.newWorkflowData("JCR_PATH", repoPath);
wfSession.startWorkflow(model, wfData);

// querying and managing a workflow
Workflow[] workflows workflows = wfSession.getAllWorkflows();
Workflow workflow= wfSession.getWorkflow(id);
wfSession.suspendWorkflow(workflow);
wfSession.resumeWorkflow(workflow);
wfSession.terminateWorkflow(workflow);

与工作流实例交互 — ECMA脚本

// starting a workflow
var model = wfSession.getModel(workflowId);
var wfData = wfSession.newWorkflowData("JCR_PATH", repoPath);
wfSession.startWorkflow(model, wfData);

// querying and managing a workflow
var workflows = wfSession.getWorkflows(“RUNNING“);
var workflow= wfSession.getWorkflow(id);
wfSession.suspendWorkflow(workflow);
wfSession.resumeWorkflow(workflow);
wfSession.terminateWorkflow(workflow);

与工作流实例交互 — 使用curl的REST

• 启动工作流

  # starting a workflow
  curl -d "model={id}&payloadType={type}&payload={payload}" http://localhost:4502/etc/workflow/instances
  
  # for example:
  curl -u admin:admin -d "model=/var/workflow/models/request_for_activation&payloadType=JCR_PATH&payload=/content/we-retail/us/en/products" http://localhost:4502/etc/workflow/instances
  

• 列出实例

  # listing the instances
  curl -u admin:admin http://localhost:4502/etc/workflow/instances.json
  

  这将列出所有实例；例如：

  [
      {"uri":"/var/workflow/instances/server0/2018-02-26/prototype-01_1"}
      ,{"uri":"/var/workflow/instances/server0/2018-02-26/prototype-01_2"}
  ]
  

  注意

  请参阅如何获取所有正在运行的工作流的列表及其ID，以列出具有特定状态的实例。

• 暂停工作流

  # suspending a workflow
  curl -d "state=SUSPENDED" http://localhost:4502/etc/workflow/instances/{id}
  
  # for example:
  curl -u admin:admin -d "state=SUSPENDED" http://localhost:4502/etc/workflow/instances/server0/2017-03-08/request_for_activation_1
  

• 恢复工作流

  # resuming a workflow
  curl -d "state=RUNNING" http://localhost:4502/etc/workflow/instances/{id}
  
  # for example:
  curl -u admin:admin -d "state=RUNNING" http://localhost:4502/etc/workflow/instances/server0/2017-03-08/request_for_activation_1
  

• 终止工作流实例

  # terminating a workflow
  curl -d "state=ABORTED" http://localhost:4502/etc/workflow/instances/{id}
  
  # for example:
  curl -u admin:admin -d "state=ABORTED" http://localhost:4502/etc/workflow/instances/server0/2017-03-08/request_for_activation_1
  

与工作项交互

以下提供了如何与工作项进行交互（按程序方式）的基本示例。

与工作项交互 — Java

// querying work items
WorkItem[] workItems = wfSession.getActiveWorkItems();
WorkItem workItem = wfSession.getWorkItem(id);

// getting routes
List<Route> routes = wfSession.getRoutes(workItem);

// delegating
Iterator<Participant> delegatees = wfSession.getDelegatees(workItem);
wfSession.delegateWorkItem(workItem, delegatees.get(0));

// completing or advancing to the next step
wfSession.complete(workItem, routes.get(0));

与工作项交互 — ECMA脚本

// querying work items
var workItems = wfSession.getActiveWorkItems();
var workItem = wfSession.getWorkItem(id);

// getting routes
var routes = wfSession.getRoutes(workItem);

// delegating
var delegatees = wfSession.getDelegatees(workItem);
wfSession.delegateWorkItem(workItem, delegatees.get(0));

// completing or advancing to the next step
wfSession.complete(workItem, routes.get(0));

与工作项交互 — 使用curl的REST

• 从收件箱中列出工作项

  # listing the work items
  curl -u admin:admin http://localhost:4502/bin/workflow/inbox
  

  收件箱中将列出当前工作项的详细信息；例如：

  [{
      "uri_xss": "/var/workflow/instances/server0/2018-02-26/prototype-01_2/workItems/node2_var_workflow_instances_server0_2018-02-26_prototype-01_2",
      "uri": "/var/workflow/instances/server0/2018-02-26/prototype-01_2/workItems/node2_var_workflow_instances_server0_2018-02-26_prototype-01_2",
      "currentAssignee_xss": "workflow-administrators",
      "currentAssignee": "workflow-administrators",
      "startTime": 1519656289274,
      "payloadType_xss": "JCR_PATH",
      "payloadType": "JCR_PATH",
      "payload_xss": "/content/we-retail/es/es",
      "payload": "/content/we-retail/es/es",
      "comment_xss": "Process resource is null",
      "comment": "Process resource is null",
      "type_xss": "WorkItem",
      "type": "WorkItem"
    },{
      "uri_xss": "configuration/configure_analyticstargeting",
      "uri": "configuration/configure_analyticstargeting",
      "currentAssignee_xss": "administrators",
      "currentAssignee": "administrators",
      "type_xss": "Task",
      "type": "Task"
    },{
      "uri_xss": "configuration/securitychecklist",
      "uri": "configuration/securitychecklist",
      "currentAssignee_xss": "administrators",
      "currentAssignee": "administrators",
      "type_xss": "Task",
      "type": "Task"
    },{
      "uri_xss": "configuration/enable_collectionofanonymoususagedata",
      "uri": "configuration/enable_collectionofanonymoususagedata",
      "currentAssignee_xss": "administrators",
      "currentAssignee": "administrators",
      "type_xss": "Task",
      "type": "Task"
    },{
      "uri_xss": "configuration/configuressl",
      "uri": "configuration/configuressl",
      "currentAssignee_xss": "administrators",
      "currentAssignee": "administrators",
      "type_xss": "Task",
      "type": "Task"
    }
  

• 委派工作项

  # delegating
  curl -d "item={item}&delegatee={delegatee}" http://localhost:4502/bin/workflow/inbox
  
  # for example: 
  curl -u admin:admin -d "item=/etc/workflow/instances/server0/2017-03-08/request_for_activation_1/workItems/node1_etc_workflow_instances_server0_2017-03-08_request_for_act_1&delegatee=administrators" http://localhost:4502/bin/workflow/inbox
  

  注意

  delegatee必须是工作流步骤的有效选项。

• 完成或将工作项目推进到下一步

  # retrieve the list of routes; the results will be similar to {"results":1,"routes":[{"rid":"233123169","label":"End","label_xss":"End"}]}
  http://localhost:4502/etc/workflow/instances/<path-to-the-workitem>.routes.json
  
  # completing or advancing to the next step; use the appropriate route ID (rid value) from the above list
  curl -d "item={item}&route={route}" http://localhost:4502/bin/workflow/inbox
  
  # for example:
  curl -u admin:admin -d "item=/etc/workflow/instances/server0/2017-03-08/request_for_activation_1/workItems/node1_etc_workflow_instances_server0_2017-03-08_request_for_activation_1&route=233123169" http://localhost:4502/bin/workflow/inbox
  

侦听工作流事件

使用OSGi事件框架来监听 com.adobe.granite.workflow.event.WorkflowEvent类定义的事件。 此类还提供了几种用于获取有关事件主题的信息的有用方法。 例如，getWorkItem方法会返回事件中涉及的工作项的WorkItem对象。

以下示例代码定义了一项服务，该服务侦听工作流事件并根据事件类型执行任务。

package com.adobe.example.workflow.listeners;

import org.apache.sling.event.jobs.JobProcessor;
import org.apache.sling.event.jobs.JobUtil;

import org.osgi.service.event.Event;
import org.osgi.service.event.EventHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.Service;

import com.adobe.granite.workflow.event.WorkflowEvent;
import com.adobe.granite.workflow.exec.WorkItem;

/**
 * The <code>WorkflowEventCatcher</code> class listens to workflow events. 
 */
@Component(metatype=false, immediate=true)
@Service(value=org.osgi.service.event.EventHandler.class)
public class WorkflowEventCatcher implements EventHandler, JobProcessor {

 @Property(value=com.adobe.granite.workflow.event.WorkflowEvent.EVENT_TOPIC)
 static final String EVENT_TOPICS = "event.topics";

 private static final Logger logger = LoggerFactory.getLogger(WorkflowEventCatcher.class);

 public void handleEvent(Event event) {
  JobUtil.processJob(event, this);
 }

 public boolean process(Event event) {
  logger.info("Received event of topic: " + event.getTopic());
  String topic = event.getTopic();

  try {
   if (topic.equals(WorkflowEvent.EVENT_TOPIC)) {
    WorkflowEvent wfevent = (WorkflowEvent)event;
    String eventType = wfevent.getEventType();
    String instanceId = wfevent.getWorkflowInstanceId();

    if (instanceId != null) {
     //workflow instance events
     if (eventType.equals(WorkflowEvent.WORKFLOW_STARTED_EVENT) ||
       eventType.equals(WorkflowEvent.WORKFLOW_RESUMED_EVENT) ||
       eventType.equals(WorkflowEvent.WORKFLOW_SUSPENDED_EVENT)) {
      // your code comes here...
     } else if (
       eventType.equals(WorkflowEvent.WORKFLOW_ABORTED_EVENT) ||
       eventType.equals(WorkflowEvent.WORKFLOW_COMPLETED_EVENT)) {
      // your code comes here...
     }
     // workflow node event
     if (eventType.equals(WorkflowEvent.NODE_TRANSITION_EVENT)) {
      WorkItem currentItem = (WorkItem) event.getProperty(WorkflowEvent.WORK_ITEM);
      // your code comes here...
     }
    }
   }
  } catch(Exception e){
   logger.debug(e.getMessage());
   e.printStackTrace();
  }
  return true;
 }
}