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The collections in general are passive. In many scenerios, consumers of collectoins would be interested in handling the events whenever the collection is modified. 

Let us assume a collection is built on by loading a property file. If any consumer object adds an element, the other objects which refers the particular collection should be notified for the new modifications done on a collection. 

The new library introduced in the project will facilitate a consumer object to register its listener. The listener will be notified with the events happening on the collection. 

"Active Collections" library written on adapting Event Delegation model to deliver the events and the source of events to the listeners. Such that the focus of the consumer object narrowed to business logic.