How to  Implement a Fall-Back Feature


How will you handle the situation when you have a big release which consists of multiple modules being integrated in one go for Production Release of your appilcation?
 Taking into consideration there might be issue with any of one of ingredient module’s code, will make entire application do go down - and hence the business will be down. A simple flaw in one file may make your entire application to get down.

= Here is the approach:
 Design a Table in database which will hold two columns ModuleNames and  flag.
ModuleName will store the name of multiple modules which are being released in current release.
When the application starts it reads the ModuleName & Flag in memory.  We may store the value from the following table in a static HashMap as  < String, boolean > .
Module_id (PK)
Module_Name
isEnabled (Flag)
Dependent_Module_id(FK)
1
ProtectAlert
1
2
2
Coexistance
1
-
3
InvestAlert
0
-

Introduce an If- block just before the line number where you have made code change for a CR.
  if (!isProtechAlertsNotifyToCAEnabled()) {
    asyncNewDeviceLoginAndAccntLock(userDetails, resultMap);//CR specific method name
   } else {
            if (log.isInfoEnabled()) {
              log.info("isAlertNotifyFallback is Enabled here.\n");
           }
   }

Implementation of this method:

public static boolean isProtechAlertsNotifyToCAEnabled() {
        boolean isProtechAlertsNotify = false;
  Map allFallbackParams = ConversionUtils.getContentFromCMCache(
                                       walletFUT_CONTENT_TYPE);

  if (null != allFallbackParams) {
                if (null != allFallbackParams.get("isAlertNotifyFallback")) {
                    boolean isFlagOn = allFallbackParams
                            .get("isAlertNotifyFallback");
                    if (isFlagOn) {
                        isAlertsNotify = true;
                    }
     }
   }

}

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