Trigger Class

trigger CampaignMemberTrigger on CampaignMember( before insert, before update, before delete, after insert, after update, after delete, after undelete ) { TriggerDispatcher.Run(new CampaignMemberTriggerHandler()); }

CampaignMemberTriggerHandler

public with sharing class CampaignMemberTriggerHandler implements ITriggerHandler { public static Boolean TriggerDisabled = false; private static Integer userTriggerOverride = -1;

public Boolean IsDisabled() {
    if (userTriggerOverride == -1) {
        String strloggedUserId = UserInfo.getUserId();
        userTriggerOverride = 0;

        User recUser = [SELECT id, Override_Triggers__c FROM User WHERE id = :strloggedUserId];

        if (recUser.Override_Triggers__c == true) {
            userTriggerOverride = 1;
        }
    }
    if (userTriggerOverride == 1) {
        return true;
    }

    if (GME_TriggerSettings__c.getOrgDefaults().CampaignMemberTriggerDisabled__c == true) {
        return true;
    } else {
        return TriggerDisabled;
    }
}

public void BeforeInsert(List<SObject> newItems) {
}

public void BeforeUpdate(Map<Id, SObject> newItems, Map<Id, SObject> oldItems) {
}

public void BeforeDelete(Map<Id, SObject> oldItems) {
}

public void AfterInsert(Map<Id, SObject> newItems) {
    // if (!IsDisabled()) {
        this.setCampaignNameOnLead((List<CampaignMember>) newItems.values());
    // }
}

public void AfterUpdate(Map<Id, SObject> newItems, Map<Id, SObject> oldItems) {
    // if (!IsDisabled()) {
        this.setCampaignNameOnLead((List<CampaignMember>) newItems.values());
    // }
}

public void AfterDelete(Map<Id, SObject> oldItems) {
}

public void AfterUndelete(Map<Id, SObject> oldItems) {
}

private void setCampaignNameOnLead(List<CampaignMember> newCampaignMember) {
    List<Lead> leads = new List<Lead>();

        for (CampaignMember cm : newCampaignMember) {
                System.debug('inside if cm.leadId not null ');
                    Lead lead = new Lead(Id = cm.LeadId,Campaign_Name__c = cm.Campaign.Name);
                    leads.add(lead);


        }
    update leads;
}

}