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Difference between revisions of "OTJ Primer"
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This page with its sub-pages tries to cover the middle ground, addressing readers who do want to learn the essential concepts of Object Teams without the burden of a detailed scientific discussion. | This page with its sub-pages tries to cover the middle ground, addressing readers who do want to learn the essential concepts of Object Teams without the burden of a detailed scientific discussion. | ||
− | Throughout this text references into the [http://www.objectteams.org/def/1.3 OT/J Language Definition] are given like this (see {{otjld|0|}}), | + | Throughout this text references into the [http://www.objectteams.org/def/1.3 OT/J Language Definition] are given like this (see {{otjld|0|}}), where the interested reader will find the detailed definitions.}} |
The programming language [[OTJ|OT/J]] introduces two '''new kinds of classes''' | The programming language [[OTJ|OT/J]] introduces two '''new kinds of classes''' |
Revision as of 13:06, 8 July 2010
The programming language OT/J introduces two new kinds of classes
However, it is much more interesting to look at what happens between these things.
Here, OT/J introduces the following major relations:
Role Playing
Role classes/objects are playedBy base classes/objects. The communication between the two part objects is defined using
- callout method bindings for forwarding role-to-base
- callin method bindings for intercepting method calls base-to-role
Role Containment
Role classes/objects are contained in a team instance.
- Roles preferably communicate with other roles.
- Roles can be confined to their enclosing team to protect them against external access
- Data-flows between a team an its outside applies translation polymorphism to translate between roles and bases:
- sending a role object to the outside applies lowering (role-to-base translation)
- sending a base object into a team applies lifting (base-to-role translation)
- Team activation controls the enablement of callin bindings
→ Details on Role Containment ...
Team Inheritances
- A team class can be sub-classed including all its contained roles (similar to Java classes with inner classes)
- A sub-team can override any of its inherited roles (different from Java inner classes).
- An overriding role implicitly inherits from its overridden version.