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Example : Apex Class Methad [When Account Status = 'Closed' then Automatically Contacts Status Should be Closed]
=========

On Account obj -- Create Picklist field Status=[Open/Closed]

On Contat obj -- Create Picklist field status=[Open/Closed]



1 . Process Name : Apex Class Methad When Account Stutas ='Closed' Auto Contact Status ='closed'
The process starts when : A Record changes

2 . Add the Object : Account [ when a record is created or edited ] click on Save

3 . Add the Criteria : Stutas = Closed. [Criteria Name also Same ]
Select : All of the conditions are met (AND)

4 . Add the Action : Action Type -- Apex.

Action Name -- When Account Stutas ='Closed' Auto Contact Status ='closed'.

Apex Class -- RelatedConatctHandler.

Set Apex Variables - accountidList- Field Reference -- Account ID.

5 . Save.

6 . Activate the Process builder.



Apex Class :
===========

public class RelatedConatctHandler {
@invocableMethod
public Static void closeContactForAccounts(List id accountidList){
List Contact contactList=[select id,status__c from contact where status__c!='Closed' AND Account.Status__c='Closed' AND Accountid in :accountidList];
for(contact c:contactList) {
c.status__c='Closed';
}
update contactList;
}
}



NOTE :
******
1 . in order to invoke Apex class From Process Builder, you need to make sure the class has a method declared with "@invocableMethod" annotation

2 . an Apex class can only have one invocableMethod.

3 . an invocableMethod must be defind as static and either public or global.

4 . Other annotations cannot be combined with the invocableMethod annotation.

5 . invocableMethod cannot be used in Apex Triggers


=========================================================

Process Builders cannot handle :
================================

1 . Process Builders cannot handle before DML It executes after a record has been created or updated.
Whereas Apex triggers can handle both before and after DML operations.

2 . Process Builder cannot handle delete and undelete DML. Whereas Apex triggers can handle all DML operations.

3 . Whenever a particular use case is not possible using Process Builder, consider using Apex triggers.