55 lines
2.2 KiB
Markdown
55 lines
2.2 KiB
Markdown
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---
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layout: pattern
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title: Data Transfer Object
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folder: data-transfer-object
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permalink: /patterns/data-transfer-object/
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categories: Architectural
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tags:
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- Performance
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---
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## Intent
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Pass data with multiple attributes in one shot from client to server, to avoid multiple calls to
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remote server.
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## Explanation
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Real world example
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> We need to fetch information about customers from remote database. Instead of querying the
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> attributes one at a time, we use DTOs to transfer all the relevant attributes in a single shot.
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In plain words
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> Using DTO relevant information can be fetched with a single backend query.
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Wikipedia says
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> In the field of programming a data transfer object (DTO) is an object that carries data between
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> processes. The motivation for its use is that communication between processes is usually done
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> resorting to remote interfaces (e.g. web services), where each call is an expensive operation.
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> Because the majority of the cost of each call is related to the round-trip time between the client
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> and the server, one way of reducing the number of calls is to use an object (the DTO) that
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> aggregates the data that would have been transferred by the several calls, but that is served by
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> one call only.
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## Class diagram
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## Applicability
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Use the Data Transfer Object pattern when:
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* The client is asking for multiple information. And the information is related.
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* When you want to boost the performance to get resources.
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* You want reduced number of remote calls.
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## Credits
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* [Design Pattern - Transfer Object Pattern](https://www.tutorialspoint.com/design_pattern/transfer_object_pattern.htm)
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* [Data Transfer Object](https://msdn.microsoft.com/en-us/library/ff649585.aspx)
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* [J2EE Design Patterns](https://www.amazon.com/gp/product/0596004273/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0596004273&linkCode=as2&tag=javadesignpat-20&linkId=f27d2644fbe5026ea448791a8ad09c94)
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* [Patterns of Enterprise Application Architecture](https://www.amazon.com/gp/product/0321127420/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0321127420&linkCode=as2&tag=javadesignpat-20&linkId=014237a67c9d46f384b35e10151956bd)
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