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What is a Trigger Handler pattern and what are its benefits?

DevelopmentMediumAccentureInfosysCognizant

The trigger contains no logic; it only routes events to a handler class with methods like beforeInsert, afterUpdate.

apex
trigger AccountTrigger on Account (before insert, after update) {
    AccountTriggerHandler h = new AccountTriggerHandler();
    switch on Trigger.operationType {
        when BEFORE_INSERT { h.beforeInsert(Trigger.new); }
        when AFTER_UPDATE  { h.afterUpdate(Trigger.new, Trigger.oldMap); }
    }
}

Benefits: reusable and unit-testable methods, clean separation of concerns, one place for recursion/bypass control, easier maintenance, and ability to use a base handler framework.

apex-triggertriggerhandlerbest-practices

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