Here is how I have implemented an automatic reloading progress page,
during credit-card payment and other long running tasks.
1) action: PaymentSubmit
2) action: PaymentProgress
3) interface: reloadInfo
4) view: progress.jsp
5) cfg: xwork.xml
PaymentSubmit receives the form data and launches a thread.
The thread runs the payment operation, but the action return "progress".
When the payment thread is done, it updates the payment object
in the HttpSession.
PaymentProgress checks the payment object in the HttpSession.
As long as the payment is not complete, it returns "progress".
After payment completion it returns "success".
This action exports a reloadInfo object with url and interval
for the progress jsp to use.
The code below have been simplified and stripped,
to make the idea (hopefully) clear.
---------------------------------------------------------
action: PaymentSubmit
---------------------------------------------------------
public class PaymentSubmit extends ActionSupport
implements BusinessAware,
CardProcessorAware,
ServletRequestAware,
Runnable
{
private CardProcessor cardProcessor;
private HttpSession session;
private Business business;
public String execute() throws Exception {
Payment payment = getPayment();
payment.paymentStart();
business.addPayment(payment);
new Thread(this).start();
return "progress";
}
public void run() {
Payment payment = getPayment();
try {
User user = payment.getUser();
cardProcessor.setPartner( user.getPartner() );
String msg = cardProcessor.performPayment(user.getCard(),
payment.getAmount());
synchronized (payment) {
payment.paymentComplete(msg==null, msg);
}
} catch (Exception e) {
synchronized (payment) {
payment.paymentComplete(false, e.toString());
}
}
}
public void setBusiness(Business business) {this.business
= business;}
public void setServletRequest(HttpServletRequest request) {this.session
= request.getSession();}
public void setCardProcessor(CardProcessor cardProcessor)
{this.cardProcessor = cardProcessor;}
public Payment getPayment() {return (Payment)
session.getAttribute("payment");}
}
---------------------------------------------------------
action: PaymentProgress
---------------------------------------------------------
public class PaymentProgress extends ActionSupport
implements BusinessAware,
ServletRequestAware
{
private HttpSession session;
private Business business;
public String execute() throws Exception {
Payment payment = getPayment();
synchronized (payment) {
if (payment.isComplete()) {
business.updatePayment(payment);
return Action.SUCCESS;
} else {
return "progress";
}
}
}
public void setBusiness(Business business) {this.business
= business;}
public void setServletRequest(HttpServletRequest request) {this.session
= request.getSession();}
public Payment getPayment() {return (Payment)
session.getAttribute("payment");}
public ReloadInfo getReloadInfo() {
return new ReloadInfo() {
public String getProgressName() {return "payment";}
public String getActionName() {return
ActionContext.getContext().getName() + ".cmd";}
public int getInterval() {return 1;}
};
}
}
---------------------------------------------------------
interface: reloadInfo
---------------------------------------------------------
public interface ReloadInfo {
String getProgressName();
String getActionName();
int getInterval();
}
---------------------------------------------------------
view: progress.jsp
I'm using JSP 2.0 / JSTL 1.1
Read the WW2 Cookbook entry below, to get the trick working
http://wiki.opensymphony.com/space/Using+WebWork2+and+XWork1+with+JSP+2.0+an
d+JSTL+1.1
---------------------------------------------------------
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<fmt:bundle basename="messages.${reloadInfo.progressName}Progress">
<html>
<head>
<meta HTTP-EQUIV="Refresh"
CONTENT="${reloadInfo.interval}; URL=""
value='/${reloadInfo.actionName}'/>">
<title><fmt:message key="title"/></title>
<style type='text/css'>
@import url(<c:url value="/style.css"/>);
table.progress {border: solid 1px red; width: 8cm;}
tr.progress {}
td.progress {background-color: orange; text-align: left;}
table.box {background-color: transparent;}
tr.box {}
td.box {background-color:red; width:3mm; height:3mm;}
</style>
</head>
<body>
<h1><fmt:message key="heading"/></h1>
<p><fmt:message key="instruction"/></p>
<c:set var="numReloads" scope="session" value="${numReloads + 1}"/>
<table class="progress" cellspacing="0" cellpadding="2">
<tr class="progress"><td class="progress">
<table class="box" border="0" cellspacing="2" cellpadding="0"><tr
class="box">
<c:forEach begin="1" end="${numReloads}"> <td
class="box"> </td> </c:forEach>
</tr></table>
</td></tr>
</table>
</body>
</html>
</fmt:bundle>
---------------------------------------------------------
cfg: xwork.xml
---------------------------------------------------------
<action name="paymentSubmit"
class="com.whatever.actions.payment.PaymentSubmit">
<result name="progress"
type="redirect">/paymentProgress.cmd</result>
<result name="input" type="view">/view/paymentForm.jsp</result>
. . .
</action>
<action name="paymentProgress"
class="com.whatever.actions.payment.PaymentProgress" >
<result name="progress" type="view">/view/progress.jsp</result>
<result name="success" type="view">. . .</result>
. . .
</action>
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of
Aaron Held
Sent: Wednesday, March 03, 2004 6:08 PM
To: [EMAIL PROTECTED]
Subject: Re: [OS-webwork] Long running tasks
Jason Carreira wrote:
Nope, no support out of the box... If you wanted, it would be easy
enough to create an asynch ActionProxy using threads or JMS, and/or to
create a JMSDispatcher to consume JMS messages and translate them to
Action executions...
Jason
Thanks,
Threads will do. I'll look into ActionProxy, but it seems easier to
understand if I have three
seperate pages.
startLongAction Page -> Refresh And Wait Page -> Show user results Page.
-Aaron
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