Hi All,
I had posted a similar query earlier to prevent double click of a form
button.
I could use Shale's <s:token> but i ran into compatibility issues
between RAD6.0.1 and Shale-core.jar1.0.3.
So i had to give it up and try another approach using Synchronizer Token
pattern as in sytuts.
Please help me fine tune it.Please go ahead to provide me any other
elegant approach.
I want to call the method generateSaveToken() from phaseListener.
Is it possible.????
Jsp Page
<h:form>
<h:inputText id="text1"/>
<h:inputHidden value="#{visit.saveToken}" />
<h:commandButton value="Submit" id="button1"
action="#{reqBean.actionMethod}" />
</h:form>
FacesConfig.xml
<managed-bean>
<description>Session bean that holds data and delegates needed by
request beans.</description>
<managed-bean-name>visit</managed-bean-name>
<managed-bean-class>com.acs.click.Visit</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
<managed-bean>
<description>Some request bean.</description>
<managed-bean-name>reqBean</managed-bean-name>
<managed-bean-class>com.acs.click.RequestBean</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
<managed-property>
<property-name>visit</property-name>
<value>#{sessionScope.visit}</value>
</managed-property>
</managed-bean>
Visit.java
public class Visit extends BaseBean {
private long activeToken;
private long receivedToken;
public long getSaveToken() {
return this.activeToken;
}
public void setSaveToken(long aToken) {
this.receivedToken = aToken;
}
public long getActiveToken() {
return activeToken;
}
public void setActiveToken(long activeToken) {
this.activeToken = activeToken;
}
public long getReceivedToken() {
return receivedToken;
}
public void setReceivedToken(long receivedToken) {
this.receivedToken = receivedToken;
}
boolean tokensMatch() {
return (this.activeToken == this.receivedToken);
}
}
RequestBean.java
public class RequestBean extends BaseBean {
public String actionMethod() {
// prevent identical requests from being processed
String normalOutcome = "Google-NOT-OK";
if (this.saveTokenIsInValid() )
return this.logInvalidSaveAndReturn(normalOutcome);
this.expireSaveToken();
System.out.println("save token is valid. attempting to
save....");
try {
// invoke some business logic here
} catch (Exception exc) {
this.generateSaveToken();
return null;
}
this.generateSaveToken();
return "success";
}
BaseBean.java
public class BaseBean {
protected void generateSaveToken() {
System.out.println("generateSaveToken()");
Random random = new Random();
long token = random.nextLong();
while (token == 0) {
token = random.nextLong();
}
System.out.println("Save token generated =>"+ token);
this.getVisit().setActiveToken(token);
this.getVisit().setReceivedToken(0);
}
protected boolean saveTokenIsInValid() {
System.out.println("saveTokenIsValid():\n active token: " +
this.getVisit().getActiveToken() + "\n recv'd token: " +
this.getVisit().getReceivedToken() );
boolean isValid = this.getVisit().tokensMatch();
return !isValid;
}
protected void expireSaveToken() {
System.out.println("expireSaveToken()");
this.getVisit().setActiveToken(0);
}
protected String logInvalidSaveAndReturn(String outcome) {
System.out.println("User submitted a save request that was not " +
"processed because the save token was not valid. Returning
outcome: '" + outcome + "'.");
return outcome;
}
// Used by JSF managed bean creation facility
public Visit getVisit() {
FacesContext context = FacesContext.getCurrentInstance();
HttpSession session = (HttpSession)
context.getExternalContext().getSession(false);
Visit visit = (Visit) session.getAttribute("visit");
return visit;
}
// Used by JSF managed bean creation facility
public void setVisit(Visit visit) {
FacesContext context = FacesContext.getCurrentInstance();
HttpSession session = (HttpSession)
context.getExternalContext().getSession(false);
session.setAttribute("visit",visit);
}
}
Best Regards,
Pallavi
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