A UML profile for OData Web APIs

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Generate an OData implementation for your data based on an initial UML domain model. Refine the model with OData information for a more precise generation.

Software

REST APIs2
Health
Demography
Transport
Government

REST APIs description formats
▹ REST is a style, not a standard
3
API Blueprint

OData in a nutshell
▹ OData is a standardized protocol for creating and
consuming data APIs
▹ Key features:
▸ Resources are defined in a data model
▸ URIs to identify resources and query data
4
GET
http://example.com/ODataDemo/Products?$top=20&$orderby=Name
XML/AtomJSON
Resource query

but…5
Developer
OData
schema
{ }
Serialization
deserialization
Query
resolution

Running example8
<edmx:Edmx Version="4.0">
<edmx:DataServices>
<Schema Namespace="com.example.ODataDemo"
Alias="ODataDemo">
<EntityType Name="Product">
<Key><PropertyRef Name="ID"/></Key>
<Property Name="ID" Type="Edm.Int32"
Nullable="false"/>
<Property Name= “Name" Type="Edm.String"
Nullable="false"/>...
<NavigationProperty Name=“Cotegories"
Type= “Collection(Category)“ Nullable="false“
Partner= “Categories"/>...
</EntityType>
<EntityContainer Name="ODataDemoService">
<EntitySet Name="Products"
EntityType="ODataDemo.Product">
<NavigationPropertyBinding Path="Categories"
Target="Categories"/>
</EntitySet>
</EntityContainer>
</Schema>
</edmx:DataServices>
</edmx:Edmx>

NavigationProperty, NavigationPropertyBinding12

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A UML profile for OData Web APIs

1. A UML Profile for OData Web APIs Hamza Ed-douibi, Javier Luis Cánovas Izquierdo, Jordi Cabot June 7, 2017 ICWE 2017, Rome, Italy.

2. REST APIs2 Health Demography Transport Government

3. REST APIs description formats ▹ REST is a style, not a standard 3 API Blueprint

4. OData in a nutshell ▹ OData is a standardized protocol for creating and consuming data APIs ▹ Key features: ▸ Resources are defined in a data model ▸ URIs to identify resources and query data 4 GET http://example.com/ODataDemo/Products?$top=20&$orderby=Name XML/AtomJSON Resource query

5. but…5 Developer OData schema { } Serialization deserialization Query resolution

6. What we propose6 UML Class diagram OData profile OData API OData clients 2 1

7. A UML profile? ▹ Profile is a lightweight extension mechanism to the UML standard ▹ A profile consists of a set of stereotypes, tagged values and constraints ▹ Stereotypes are formal extensions of existing model elements within the UML metamodel 7

8. Running example8 <edmx:Edmx Version="4.0"> <edmx:DataServices> <Schema Namespace="com.example.ODataDemo" Alias="ODataDemo"> <EntityType Name="Product"> <Key><PropertyRef Name="ID"/></Key> <Property Name="ID" Type="Edm.Int32" Nullable="false"/> <Property Name= “Name" Type="Edm.String" Nullable="false"/>... <NavigationProperty Name=“Cotegories" Type= “Collection(Category)“ Nullable="false“ Partner= “Categories"/>... </EntityType> <EntityContainer Name="ODataDemoService"> <EntitySet Name="Products" EntityType="ODataDemo.Product"> <NavigationPropertyBinding Path="Categories" Target="Categories"/> </EntitySet> </EntityContainer> </Schema> </edmx:DataServices> </edmx:Edmx>

9. OData service9

10. EntityType, EntitySet10

11. Key, Property11

12. NavigationProperty, NavigationPropertyBinding12

13. And More ▹ Stereotypes: • Enumerations • Complex types • Annotations • Singletons ▹ OCL constraints to validate the profile 13

14. Automatic application of the profile14 UML Class diagram OData profile 2 1 Product <<ODEntityType>> <<ODEntitySet>> name = Product … name = Products …

15. Implementation15

16. Conclusion

17. Conclusion ▹ A UML profile to model OData Web APIs ▹ Automatic application of OData profile 17 Profile Tuning Functions Actions … Future work Reverse- engineering ER models Databases … Code generation OData APIs OData clients … Integration with other modeling languages IFML BPMN …

18. Thank you! A UML profile for OData Web APIs Hamza Ed-douibi, Javier Luis Cánovas Izquierdo, Jordi Cabot 18 ▹Check it out at: https://github.com/SOM-Research/OData ▹ contact: hed-douibi@uoc.edu Icons credits: CC 3.0 Freepik, Maxim Basinski , Madebyoliver from www.flaticon.com UML Class diagram OData profile OData API OData clients 2 1

Notas do Editor

I’ll start the presentation by explaining where Odata fits in the world of Web APIs. Then I’ll describe the motivation behind this paper I’ll explain then our approach. I’ll finally conclude the presentation and introduce our future work
In the last years we have seen an explosion of available Web Apis specially because of the emergence of REST
However if consuming ODAta apis is easy, creating them is a time consuming task
In this paper we propose an approach which relies on model-driven techniques to facilitate the development of Odata Web APIs
Which define a formal extension of exisiting model elements withing the UML metamodel

A UML profile for OData Web APIs

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