Michael Bolz created OLINGO-482:
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Summary: Refactoring of {{Processor}} interfaces
Key: OLINGO-482
URL: https://issues.apache.org/jira/browse/OLINGO-482
Project: Olingo
Issue Type: Improvement
Components: odata4-server
Affects Versions: V4 4.0.0-beta-01
Reporter: Michael Bolz
h2. Idea
During the introduction of the {{RepresentationType}} a discussion has started
about re-factoring of the {{Processor}} interfaces.
The new idea is to create an own {{*Processor}} interface for each
{{RepresentationType}} which then has the according HTTP methods (in form of
read/write/..).
As a result we don’t have explicit {{ProcedureProcessor}} because during the
dispatching the {{ReturnType}} of an e.g. Function is evaluated and the call is
than processed by the according e.g. {{EntityProcessor}} or
{{EntitySetProcessor}} or {{SomeOtherProcessor}}.
For the {{ProcessorInterfaces}} the return type ({{RepresentationType}}) and
its content is leading (and NOT the format). According to this each return type
(RepresentationType) results in an own {{*Processor}} Interface with methods
for the possible HTTP Requests (see Mapping HTTP Request -> Processor Method).
For some exception the return types should be added as method to an existing
{{Processor}} Interface.
As example the {{readPrimitiveAsValue(..)}} method should be added at
{{EntityProcessor}}. On the other side for the {{countXX(...)}} methods an own
{{Processor}} should be created because the result is not the content of the
entity (in a different format).
h2. Mapping HTTP Request -> Processor Methode
* HTTP GET -> read_XX(...)
* HTTP POST -> create_XX(...)
* HTTP PUT -> update_XX(...)
** HTTP PATCH -> update_XX(...)
* HTTP DELETE -> delete_XX(...)
h2. Processor Interfaces
* ServiceDocument - R
* Metadata - R
* Error - P rocess
* Batch - P rocess
* Entity - CRUD
* EntityCollection - R
* Primitive - RUD
* PrimitiveCollection - RUD
* Complex - RUD
* ComplexCollection - RUD
* Count Processor als
** Count - R
oder
** CountEntityCollection - R
** CountPrimitiveCollection - R
** CountComplexCollection - R
* Media - CRUD => Create Media at {{EntityProcessor}}
* -Binary - CRUD-
* -Value - CRUD- => Added as {{readPrimitiveAsValue(...)}} Methode at the
{{PrimitiveTypeProcessor}}
* Reference - CRUD
* ReferenceCollection - RU\[?\]
* Difference (Delte/Tombstone) - R
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