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The aggregate enterprise integration pattern right now supports one type of aggregation out-of-the box: set . A business application might require a variant to this type of aggregation, one that is tightly coupled to the business process say. To enable such customizations to aggregate, a user can define their own aggregate implementation which is plugged in seamlessly into the runtime.
A simple POJO can be used to extend and customize the aggregate functionality. The IFL section here describes how you can extend aggregate.