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https://issues.apache.org/jira/browse/ISIS-369?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dan Haywood updated ISIS-369:
-----------------------------
Labels: ddd domain-driven-design dsl framework gsoc java mentor mentoring
nakedobjects (was: ddd domain-driven-design dsl framework gsoc2013 java
nakedobjects)
> [Mentored?] A domain-specific language aligned with the Apache Isis
> programming conventions.
> --------------------------------------------------------------------------------------------
>
> Key: ISIS-369
> URL: https://issues.apache.org/jira/browse/ISIS-369
> Project: Isis
> Issue Type: New Feature
> Components: GSOC
> Reporter: Dan Haywood
> Labels: ddd, domain-driven-design, dsl, framework, gsoc, java,
> mentor, mentoring, nakedobjects
>
> From our website (http://isis.apache.org):
> Apache Isis™ software is a framework for rapidly developing domain-driven
> apps in Java. Write your business logic in entities, domain services and
> repositories, and the framework dynamically generates a representation of
> that domain model as a webapp or a RESTful API. Use for prototyping or
> production.
> ~~~
> Isis works by building a metamodel from the domain object models, where these
> follow a number of straightforward programming conventions (basically, pojos
> + some annotations, see our cheat sheet
> [http://isis.apache.org/getting-started/cheat-sheet.html]).
> A discussion that's we've had on the mailing list a few times is to support a
> DSL tailored to these conventions, that would compile down to the same
> bytecode.
> A good candidate technology, we suspect, is Eclipse's XText
> [http://www.eclipse.org/Xtext/] or, perhaps, Eclipse XTend
> [http://eclipse.org/xtend/]
> And below is a sketch of what that DSL might look like.
> For entities:
> @... // annotations here
> entity Customer {
> ...
>
> ProductRepository products;
> OrderRepository orders;
> }
> where:
> - the products, orders imply an instance variable and a setter to allow
> services to be injected into
> - DomainObjectContainer container is provided automatically as a field
> For entity properties:
> entity Customer {
> @ ... // annotations here
> property String firstName {
> set;
> modify { ... }
> clear { }
> default { ... }
> choices { ... }
> hide { ... }
> disable { ... }
> validate { ... }
> }
> }
> where
> - property is a keyword
> - String firstName
> - implies the instance variable and the getter
> - annotations can be specified, apply to the getter
> - set;
> - is optional,
> - if present implies the setter (and so is a non-derived property)
> - syntax borrowed from C#
> - modify { ... }
> - is optional
> - if present, implies the modifyXxx(String value) method
> - 'value' would be an implicitly available locally scoped parameter
> - clear { ... }
> - is optional
> - if present, implies the void clearXxx() method
> - default { ... }
> - is optional
> - if present, implies the String defaultXxx() method
> - choices { ... }
> - is optional
> - if present, implies the List<String> choicesXxx() method
> - hide { ... }
> - is optional
> - if present, implies the boolean clearXxx() method
> - disable { ... }
> - is optional
> - if present, implies the String disableXxx() method
> - validate { ... }
> - is optional
> - if present, implies the String validateXxx(String value) method
> - 'value' would be an implicitly available locally scoped parameter
>
> similarly for entity collections:
> entity Customer {
> @ ... // annotations here
> collection List<Order> orders {
> addTo { ... }
> removeFrom { }
> hide { ... }
> disable { ... }
> validateAddTo { ... }
> validateRemoveFrom { ... }
> }
> }
> where
> - collection is a keyword
> - otherwise similarly as properties
> and similarly for entity actions:
> entity Customer {
> @... // annotations here
> action Order placeOrder(
> Product product {
> default { }
> choices { }
> validate { }
> },
> int quantity {
> default { }
> choices { }
> validate { }
> }
> ) {
> body { ... }
> hide { ... }
> disable { ... }
> validate { ... }
> }
> }
> where
> - the name of the parameter would imply @Named(...)
> - the default, choices, validate for the parameters apply to that parameter
> - imply corresponding defaultNXxx(), choicesNXxx, validateNXxx()
> - where N = parameter number
> - body { ... }
> - is the action body, with the parameters defined
> - hide, disable
> - similarly
> - validate (at action level)
> - corresponds to validateXxx(...)
> - to validate the set of arguments rather than an individual parameter
>
> Any members that do not follow the above rules are just copied over "as-is"
> into Java.
>
>
> ~~~~~~~~~~~~
> For values:
> value FractionalNumber {
> int numerator;
> int denominator;
> }
> is basically the same as Lombok @Data
> requires information in @ValueSemanticsProvider to be specified (somehow, not
> sure exactly how)
> ~~~~~~~~~~~~
> For services/repositories:
> service ProductRepository {
> }
> where:
> - any services are injected into as for entities
> - DomainObjectContainer container is provided for free, again as for entities
> - actions as for entities
> - properties and collections are disallowed
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