【整合篇】Activiti業務與流程整合之查詢（三）

標籤：

繼前兩篇部落格：應用第三種方式

 

實體中不需要引入任何與工作流程相關的任何屬性，單純的做好自己即可！例如如下申請實體（Leave）：

package com.tgb.itoo.basic.entity;import java.util.Date;import java.util.HashSet;import java.util.Map;import java.util.Set;import javax.persistence.CascadeType;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.FetchType;import javax.persistence.JoinColumn;import javax.persistence.ManyToOne;import javax.persistence.OneToMany;import javax.persistence.Table;import javax.persistence.Temporal;import javax.persistence.TemporalType;import javax.persistence.Transient;import org.activiti.engine.history.HistoricProcessInstance;import org.activiti.engine.repository.ProcessDefinition;import org.activiti.engine.runtime.ProcessInstance;import org.activiti.engine.task.Task;import org.codehaus.jackson.annotate.JsonIgnore;import org.springframework.format.annotation.DateTimeFormat;/** * Entity: Leave * * @author hejingyuan IdEntity implements Serializable */@Entity@Table(name = "OA_LEAVE")public class Leave  extends IdEntity {     /** *  */private static final long serialVersionUID = 1L;private String processInstanceId;    private String userId;    private String testId;    private String oldCourse;    private String applyCourse;    @Column    public String getApplyCourse() {return applyCourse;}public void setApplyCourse(String applyCourse) {this.applyCourse = applyCourse;}@Column    public String getOldCourse() {return oldCourse;}public void setOldCourse(String oldCourse) {this.oldCourse = oldCourse;}@Columnpublic String getNewCourse() {return newCourse;}public void setNewCourse(String newCourse) {this.newCourse = newCourse;}private String newCourse;       @Column    public String getTestId() {return testId;}public void setTestId(String testId) {this.testId = testId;}   @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm")    private Date startTime;    @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm")    private Date endTime;    private Date applyTime;    private String leaveType;    private String reason;    //-- 臨時屬性 --//    private Map<String, Object> variables;        @Column    public String getProcessInstanceId() {        return processInstanceId;    }    public void setProcessInstanceId(String processInstanceId) {        this.processInstanceId = processInstanceId;    }    @Column    public String getUserId() {        return userId;    }    public void setUserId(String userId) {        this.userId = userId;    }    @Temporal(TemporalType.TIMESTAMP)    @Column(name = "START_TIME")    public Date getStartTime() {        return startTime;    }    public void setStartTime(Date startTime) {        this.startTime = startTime;    }    @Temporal(TemporalType.TIMESTAMP)    @Column(name = "END_TIME")    public Date getEndTime() {        return endTime;    }    public void setEndTime(Date endTime) {        this.endTime = endTime;    }    @Column    @Temporal(TemporalType.TIMESTAMP)    public Date getApplyTime() {        return applyTime;    }    public void setApplyTime(Date applyTime) {        this.applyTime = applyTime;    }    @Column    public String getLeaveType() {        return leaveType;    }    public void setLeaveType(String leaveType) {        this.leaveType = leaveType;    }    @Column    public String getReason() {        return reason;    }    public void setReason(String reason) {        this.reason = reason;    }         @Transient    public Map<String, Object> getVariables() {        return variables;    }    public void setVariables(Map<String, Object> variables) {        this.variables = variables;    }}

那麼查詢時要如何與工作流程進行整合？

我們來看待辦任務結點：

 /**     * 工作清單ERROR [stderr] (http-localhost/127.0.0.1:8080-3) ScriptEngineManager providers.next(): javax.script.ScriptEngineFactory: Provider com.sun.script.javascript.RhinoScriptEngineFactory not found     *     * @param leave     */    @RequestMapping(value = "list/task")    public ModelAndView taskList(HttpSession session, HttpServletRequest request) {    List<Map<String, Object>> results = new ArrayList<Map<String, Object>>();    String userId = UserUtil.getUserFromSession(session).getId();    results=abstractTaskList(userId);        return new ModelAndView("/oa/leave/taskList","results",results);                                          }      /**     * 抽象出來的查看工作清單，與基本業務無關     *     * @param userId 使用者id     * @return     */public List<Map<String, Object>> abstractTaskList(String userId){    List<Leave> results = new ArrayList<Leave>();     // 根據當前人的ID查詢     TaskQuery taskQuery = taskService.createTaskQuery().taskCandidateOrAssigned(userId);             List<Task> tasks = taskQuery.list();          int i=0;             List<Map<String, Object>> mapList = new ArrayList<Map<String, Object>>();     // 根據流程的業務ID查詢實體並關聯     for (Task task : tasks) {         String processInstanceId = task.getProcessInstanceId();         ProcessInstance processInstance = runtimeService.createProcessInstanceQuery().processInstanceId(processInstanceId).active().singleResult();         String businessKey = processInstance.getBusinessKey();         if (businessKey == null) {             continue;         }                   Map<String, Object> map = new HashMap<String, Object>();                  Leave leave = leaveBean.findEntityById(businessKey);                               map.put("leave", leave);//存入“申請資訊” map.put("task", task); map.put("processDefinition", getProcessDefinition(processInstance.getProcessDefinitionId())); map.put("processInstance", processInstance);//存入“流程執行個體” mapList.add(map);         /*Leave leave=updateEntity(processInstance,task,businessKey);         results.add(leave); */         i=i+1;     }return mapList;}

此時我們採用的方式是利用businessKey，並不使用流程變數中存放的業務資料，而是直接去業務表中進行查詢，避免了不同步的情況，而且返回值採用map的形式，並不需要業務實體去添加額外的屬性，離我們所說的AOP更近了一步。

以上的這些方式也都是在實踐中的積累，做個總結記錄一下！

【整合篇】Activiti業務與流程整合之查詢（三）