Difference between revisions of "DTO DSL"
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Using the '''DTO DSL''', it is easy to create DTOs and the mapper classes that link them to the respective persistence entities. Property change support is automatically included in order to have current data without direct dependencies on the persistence layer. | Using the '''DTO DSL''', it is easy to create DTOs and the mapper classes that link them to the respective persistence entities. Property change support is automatically included in order to have current data without direct dependencies on the persistence layer. | ||
| + | |||
| + | ==Overview== | ||
| + | |||
| + | The main semantic elements of the DTO DSL are the following: | ||
| + | * '''Package''' - the root element that contains all the other elements. A model can contain multiple packages. | ||
| + | * '''Import''' declarations - used to import other DTO models or the entity model files that are covered by the DTOs. | ||
| + | * '''Datatype''' declarations - a way to define datatypes that can be used (only within the package - private scope). | ||
| + | * '''DTO''' - the model of a DTO that wraps an entity. It contains further elements such as properties and references. Appropriate mapper methods can be specified. | ||
| + | * '''Property''' - a reference to an enum, a Java class or a “simple datatype" (as defined in the datatype declaration). Can be inherited from the wrapped entity and offers multiplicity. | ||
| + | * '''Reference''' - a reference to another DTO. Can be inherited from the wrapped entity and offers multiplicity. | ||
| + | * '''Operations''' - similar to Java methods. The Xbase expression language can be used to write high-level code. | ||
| + | * '''Comments''' can be added to all elements. | ||
| + | |||
| + | '''Caveat:''' In order to make use of the DTO DSL, one has to make sure that the OSBP builder is executed after the Xtext builder. | ||
Revision as of 09:45, 4 August 2016
Copyright Notice
All rights are reserved by Compex Systemhaus GmbH. In particular, duplications, translations, microfilming, saving and processing in electronic systems are protected by copyright. Use of this manual is only authorized with the permission of Compex Systemhaus GmbH. Infringements of the law shall be punished in accordance with civil and penal laws. We have taken utmost care in putting together texts and images. Nevertheless, the possibility of errors cannot be completely ruled out. The Figures and information in this manual are only given as approximations unless expressly indicated as binding. Amendments to the manual due to amendments to the standard software remain reserved. Please note that the latest amendments to the manual can be accessed through our helpdesk at any time. The contractually agreed regulations of the licensing and maintenance of the standard software shall apply with regard to liability for any errors in the documentation. Guarantees, particularly guarantees of quality or durability can only be assumed for the manual insofar as its quality or durability are expressly stipulated as guaranteed. If you would like to make a suggestion, the Compex Team would be very pleased to hear from you.
(c) 2016-2024 Compex Systemhaus GmbH
Purpose
The DTO DSL facilitates the creation and handling of data transfer objects (DTOs) in order to carry data between processes. Communication between processes is usually done by calls to remote interfaces and services where each call is a computationally expensive and time-consuming operation. The use of DTOs that aggregate the data that would have been transferred separately reduces the number of calls that are necessary, thus speeding up the operation. Furthermore, DTOs are decoupled from the JPA, thus eliminating burdensome dependencies.
Using the DTO DSL, it is easy to create DTOs and the mapper classes that link them to the respective persistence entities. Property change support is automatically included in order to have current data without direct dependencies on the persistence layer.
Overview
The main semantic elements of the DTO DSL are the following:
- Package - the root element that contains all the other elements. A model can contain multiple packages.
- Import declarations - used to import other DTO models or the entity model files that are covered by the DTOs.
- Datatype declarations - a way to define datatypes that can be used (only within the package - private scope).
- DTO - the model of a DTO that wraps an entity. It contains further elements such as properties and references. Appropriate mapper methods can be specified.
- Property - a reference to an enum, a Java class or a “simple datatype" (as defined in the datatype declaration). Can be inherited from the wrapped entity and offers multiplicity.
- Reference - a reference to another DTO. Can be inherited from the wrapped entity and offers multiplicity.
- Operations - similar to Java methods. The Xbase expression language can be used to write high-level code.
- Comments can be added to all elements.
Caveat: In order to make use of the DTO DSL, one has to make sure that the OSBP builder is executed after the Xtext builder.
