I used UOW::getIdentityMap for collecting messages because any loaded entity might issue messages.
Consider a classic DDD example. AddOrderItem command is being handled. An Aggregate Root Order is retrieved from its repository. Order::addItem() method is called and an item is added to the incapsulated Item collection. OrderItemAdded event is recorded. In this case the aggregate root Order has not changed from the Doctrine POV, so it's not in the $uow->getScheduledEntityUpdates() array. That's why we need to check all managed entities by iterating over the identity map.
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