[ODATA-43] No indicator for optimistic concurrency control on EntityType or EntitySet level - OASIS Technical Committees Issue Tracker

Details

Type: Improvement
Status: Closed
Priority: Major
Resolution: Fixed
Affects Version/s: V4.0_WD01
Fix Version/s: V4.0_WD01
Component/s: CSDL XML, Protocol, Vocabularies
Labels:
None
Environment:

[Proposed]

Proposal:

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Remove ConcurrencyMode facet attribute.

Define a new Behavior vocabulary with an annotation that expresses this meaning:

<Term Name="OptimisticConcurrencyControl" Type="Capabilites.OptimisticConcurrencyControlType" AppliesTo="EntitySet" />
<ComplexType Name="OptimisticConcurrencyControlType">
<Documentation>
<Summary>If present, the annotated entity set uses optimistic concurrency control</Summary>
<LongDescription>If the ETag is computed from properties of entities of this set, these are listed in ETagDependsOn</LongDescription>
</Documentation>
<Property Name="ETagDependsOn" Type="Collection(Edm.Property)" Nullable="true" />
</ComplexType>

Accepted: https://www.oasis-open.org/committees/download.php/48411/odata-meeting-27_on-20130228-minutes.html#odata-43

Addendum: remove references to ConcurrencyMode from Part 1: Protocol, refer to Behavior vocabulary in ETag section

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Remove ConcurrencyMode facet attribute. Define a new Behavior vocabulary with an annotation that expresses this meaning: <Term Name="OptimisticConcurrencyControl" Type="Capabilites.OptimisticConcurrencyControlType" AppliesTo="EntitySet" /> <ComplexType Name="OptimisticConcurrencyControlType"> <Documentation> <Summary>If present, the annotated entity set uses optimistic concurrency control</Summary> <LongDescription>If the ETag is computed from properties of entities of this set, these are listed in ETagDependsOn</LongDescription> </Documentation> <Property Name="ETagDependsOn" Type="Collection(Edm.Property)" Nullable="true" /> </ComplexType> Accepted: https://www.oasis-open.org/committees/download.php/48411/odata-meeting-27_on-20130228-minutes.html#odata-43 Addendum: remove references to ConcurrencyMode from Part 1: Protocol, refer to Behavior vocabulary in ETag section
Resolution:

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https://www.oasis-open.org/committees/download.php/48439/odata-core-v4.0-wd01-part1-protocol-2013-03-05-RH.doc

https://www.oasis-open.org/committees/download.php/48440/odata-core-v4.0-wd01-part3-csdl-2013-03-05-RH.doc
https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/schemas/edm.xsd?rev=205

https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/vocabularies/Org.OData.Behavior.V1.xml?rev=205

Accepted: https://www.oasis-open.org/committees/download.php/48549/odata-meeting-29_on-20130314-minutes.html#odata-43

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https://www.oasis-open.org/committees/download.php/48439/odata-core-v4.0-wd01-part1-protocol-2013-03-05-RH.doc https://www.oasis-open.org/committees/download.php/48440/odata-core-v4.0-wd01-part3-csdl-2013-03-05-RH.doc https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/schemas/edm.xsd?rev=205 https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/vocabularies/Org.OData.Behavior.V1.xml?rev=205 Accepted: https://www.oasis-open.org/committees/download.php/48549/odata-meeting-29_on-20130314-minutes.html#odata-43

Description

Currently the only way for a server to indicate to its clients that entities of a given type use optimistic concurrency control, and that the client thus has to watch out for ETags in responses and provide appropriate If-Modified headers in requests is to use the ConcurrencyMode="Fixed" facet on simple properties of an entity type.

If the server

does not wish to disclose which properties it uses for optimistic concurrency control, or
does not include the concurrency control properties in the entity type, or
includes the properties as part of a complex type
it has no means to advertise the presence of optimistic concurrency control to the client.

No indicator for optimistic concurrency control on EntityType or EntitySet level

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