# IT:AD:Patterns:IdentityMap #



<callout type="Navigation" class="small">

* [[../|(UP)]]
{{indexmenu>.#2|nsort tsort}}





---


</callout>


<panel title="Summary">
Ensures that each object gets loaded only once by keeping every loaded object in a map. Looks up objects using the map when referring to them.


</panel>


### Sequence Diagram ###

![MF](http://martinfowler.com/eaaCatalog/idMapperSketch.gif)