OSWorkflow的第二支程式

這裡將介紹如何在流程裡加上限制，首先修改leave.xml，限制送出假單的人一定要是啟動流程的人。

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE workflow PUBLIC "-//OpenSymphony Group//DTD OSWorkflow 2.7//EN"
"http://www.opensymphony.com/osworkflow/workflow_2_7.dtd">
<workflow>
  <initial-actions>
   <action id="0" name="開始">
      <pre-functions>
<function type="class">
    <arg name="class.name">com.opensymphony.workflow.util.Caller</arg>
    </function>
      </pre-functions>
      <results>
        <unconditional-result old-status="Finished" status="Queued"
step="1" owner="${caller}" />
      </results>
    </action>
  </initial-actions>

  <steps>
    <step id="1" name="填假單">
      <actions>
        <action id="1" name="送出">
          <restrict-to>
            <conditions>
              <condition type="class">
                <arg name="class.name">
                  com.opensymphony.workflow.util.AllowOwnerOnlyCondition
                </arg>
              </condition>
            </conditions>
          </restrict-to>
          <pre-functions>
      <function type="class">
      <arg name="class.name">com.opensymphony.workflow.util.Caller</arg>
    </function>
          </pre-functions>
          <results>
            <unconditional-result old-status="Finished" status="Queued"
step="2"  owner="${caller}" />
          </results>
        </action>
      </actions>
    </step>

    <step id="2" name="批假單">
      <actions>
        <action id="2" name="准許">
  <pre-functions>
    <function type="class">
      <arg name="class.name">com.opensymphony.workflow.util.Caller</arg>
    </function>
  </pre-functions>
          <results>
            <unconditional-result old-status="Finished" status="Queued"
step="3"  owner="${caller}"/>
          </results>
        </action>

        <action id="3" name="駁回">
  <pre-functions>
    <function type="class">
      <arg name="class.name">com.opensymphony.workflow.util.Caller</arg>
    </function>
  </pre-functions>
          <results>
            <unconditional-result old-status="Finished" status="Queued"
step="1"  owner="${caller}"/>
          </results>
        </action>
      </actions>     
    </step>

    <step id="3" name="停止" />
  </steps>
</workflow>

接著更改Leave.java及LeaveAction.java，讓啟動流程的人和送出假單的人可以不同。
    Leave.java
package tw.idv.idealist;

import com.opensymphony.workflow.InvalidActionException;
import com.opensymphony.workflow.InvalidEntryStateException;
import com.opensymphony.workflow.InvalidInputException;
import com.opensymphony.workflow.InvalidRoleException;
import com.opensymphony.workflow.Workflow;
import com.opensymphony.workflow.WorkflowException;
import com.opensymphony.workflow.basic.BasicWorkflow;
import com.opensymphony.workflow.config.DefaultConfiguration;
import com.opensymphony.workflow.spi.Step;

/**
* 請假流程
* @author steven
*/
public class Leave {
/**
* 啟動流程
* @param employee 員工編號
* @return 工作流編號
*/
public long start(String employee) {
Workflow workflow = new BasicWorkflow(employee);
DefaultConfiguration config = new DefaultConfiguration();
workflow.setConfiguration(config);
long workflowId = -1;
try {
//leave是workflowx.xml中定的名稱
workflowId = workflow.initialize("leave", 0, null);
} catch (InvalidActionException e) {
e.printStackTrace();
} catch (InvalidRoleException e) {
e.printStackTrace();
} catch (InvalidInputException e) {
e.printStackTrace();
} catch (InvalidEntryStateException e) {
e.printStackTrace();
} catch (WorkflowException e) {
e.printStackTrace();
}

return workflowId;
}

/**
* 送出假單
* @param workflowId 工作流編號
* @param employee 員工編號
*/
public void send(long workflowId, String employee) {
Workflow workflow = new BasicWorkflow(employee);
DefaultConfiguration config = new DefaultConfiguration();
workflow.setConfiguration(config);
try {
workflow.doAction(workflowId, 1, null);
} catch (InvalidActionException e) {
e.printStackTrace();
} catch (InvalidRoleException e) {
e.printStackTrace();
} catch (InvalidInputException e) {
e.printStackTrace();
} catch (InvalidEntryStateException e) {
e.printStackTrace();
} catch (WorkflowException e) {
e.printStackTrace();
}
}

/**
* 准假假單
* @param workflowId 工作流編號
* @param actionId 動作編號, 2 准許, 3 駁回
*/
public void allow(long workflowId, int actionId) {
Workflow workflow = new BasicWorkflow("manager1");
DefaultConfiguration config = new DefaultConfiguration();
workflow.setConfiguration(config);
try {
workflow.doAction(workflowId, actionId, null);
} catch (InvalidInputException e) {
e.printStackTrace();
} catch (WorkflowException e) {
e.printStackTrace();
}
catch (InvalidActionException e) {
e.printStackTrace();
}
}
}
    LeaveAction.java
package tw.idv.idealist.actions;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import tw.idv.idealist.Leave;

/**
* @author Steven
*/
public class LeaveAction extends HttpServlet {

public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doPost(req, resp);
}

public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
Leave leave = new Leave();
String employee = req.getParameter("employee");
long workflowId = leave.start(employee);
leave.send(workflowId, "someone"); // <<== 非啟動流程的人送出假單
resp.sendRedirect("allow.jsp?workflowId=" + workflowId);
}

}
package tw.idv.idealist.actions;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import tw.idv.idealist.Leave;

/**
* @author Steven
*/
public class LeaveAction extends HttpServlet {

public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doPost(req, resp);
}

public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
Leave leave = new Leave();
String employee = req.getParameter("employee");
long workflowId = leave.start(employee);
leave.send(workflowId, "someone"); // <<== 非啟動流程的人送出假單
resp.sendRedirect("allow.jsp?workflowId=" + workflowId);
}

}
啟動Tomcat，並執行leave.jsp後，會出現如下exception，確實OSWorkflow偵測到啟動流程的人和送出假單的人不同。

com.opensymphony.workflow.InvalidActionException: Action 1 is invalid
at com.opensymphony.workflow.AbstractWorkflow.doAction(AbstractWorkflow.java:546)
at tw.idv.idealist.Leave.send(Leave.java:56)
at tw.idv.idealist.actions.LeaveAction.doPost(LeaveAction.java:25)
at tw.idv.idealist.actions.LeaveAction.doGet(LeaveAction.java:17)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2422)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:163)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:199)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:700)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:584)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:534)