Recursive triggers in Salesforce || interview stuff

                                       Recursive triggers in Salesforce

Suppose there is a scenario where in one trigger perform update operation, which results in invocation of second trigger and the update operation in second trigger acts as triggering criteria for trigger one.

Solution:

Class:

public class Utility

{

    public static boolean isFutureUpdate;

}

Trigger:

trigger updateSomething on Account (after insert, after update)

{

    /*  This trigger performs its logic when the call is not from @future */

    if(Utility.isFutureUpdate != true)

    {

        Set<Id> idsToProcess = new Se<Id>();

        for(Account acct : trigger.new)

        {

            if(acct.NumberOfEmployees > 500)

            {

                idsToProcess.add(acct.Id);

            }

        }

        /* Sending Ids to @future method for processing */

        futureMethods.processLargeAccounts(idsToProcess);

    }

}

Class:

public class FutureMethods

{

    @future

    public static void processLargeAccounts(Set<Id> acctIDs)

    {

        List<Account> acctsToUpdate = new List<Account>();

        /* isFutureUpdate is set to true to avoid recursion */

        Utility.isFutureUpdate = true;

       

        update acctsToUpdate;

    }

}