OS.bee Tutorial

OS.bee Tutorial

Introduction

This tutorial will introduce the architecture, technology and functionality of OS.bee using basic OS.bee application My1App.

My1App is a personal administration application consisting of a collection of models based on OS.bee Domain Specific Languages. It is generated by Eclipse wizards; the wizards build the Eclipse workspace, provide the basic structure and a number of consistent objects of models.

We use the "2BEE concept":

1. describe the requirements from the point of a fictive user with using story map
2. technically implement the requirements of user

You can step by step expand the rudimentary person administration (which has only basic configuration) with the user stories described in the story map, and then generate an employee administration based on your new person administration.

Please notice:

• The task solutions can often be solved either by DSL code or graphic modeling. We will only present the solution with DSL code in this tutorial. You can use any one of them as you will.
• Each tutorial user stories are independent from each other; you don’t need to totally complete the tutorial in once.

Purpose

The task for the user of this tutorial is first the administration of personal data and then the main task is the administration of employee data.

Requirement

My1App is a personal administration application consisting of a collection of models based on OS.bee Domain Specific Languages. It is generated by Eclipse wizards; the wizards build the Eclipse workspace, provide the basic structure and a number of consistent objects of models. So before executing the tutorial steps in this tutorial using My1App, the appropriate wizards must be installed. You can find more information about installation in doc of My1App.

My1App has the following basic objects:

• The superclass BaseID, which has only one attribute identifier (id) as UUID (See UUID). It is the technical key as a basis of identification and it is an obligation for all entities.
• The entity Person , which inherits the identifier attribute (id) from the superclass BaseID and has additional personal attributes.

The following vertically divided person-view represent the entity Person in My1App, on the left side is the Person-Table and on the right side is the Person-Dialog:

Use cases

The personal administration should be extended by the following use cases:

• change address
• search person with full-name
• establish current age of person
• add profile picture
• add gender
• add marital status

The expected employee administration is described by the following use cases:

• hire employee
• fire employee
• increase salary of employee
• assign employee
• transfer employee
• evaluate employee

Story map

User stories

Administration of personal data

Change the address

Target:

Introducing the EntityDSL instance by extending an existing entity with new attributes.

Requirement:

As an administrator, I want to change a person's address.

User Task & User Story:

Process:

First of all, we need to set Street (Person.street), City (Person.city), Postal Code (Person.postal_code) and Country (Person.country) of a person.

Following are new attributes for the entity person (Person):

• street (street)
• city (city)
• postal code (postal_code)
• country (country)

These new attributes should be created as the extension of the entity person (Person).

After that, mocking data should be extended regarding to the new attributes, in order to already have data to use after restarting the application. Or we can change the address by hand using the Person Table and Person Dialog UI.

Detail implementation:

• Edit the EntityDSL model (my1app.entity) (See Entity DSL ).
  • Add the attributes street (street), city (city), postal code (postal_code) and country (country) as variables of the entity person (person).

  

• new graphic view of entity Person:

• mock data:

Test:

• After the creation of new attributes, we can change the address by calling up the person perspective via the menu entry of the person administration:

1. Call up the Person Administration menu.
   • open the employee perspective:
     • on the left side is the table of all persons.
     • on the right side is the persons dialog.
2. Edit a person.
   • Select an existing and already created person from the person table on the left side of the perspective.
     • Change the corresponding address attributes street (street), city (city), postal code (postal_code) and country (country) in the person dialog on the right side of the perspective.
3. Save the changed personal data.

Search person with full-name

Target:

Introducing a text search field and a function within the EntityDSL instance.

Requirement:

As a user of the OS.bee application, I want to find a person through a name-search.

User Task & User Story:

Process:

The full-text name search for a person requires a new attribute which show the full name (Person.full_name) of a person. This full name should be filled by a function from the attributes first name (person.first_name) and last name (person.last_name) during the creation or modification.

• Creation of the new attribute full name (full_name) as search text field.
• Creation of the function (full_name_function) as extension of the entity person (person).

Detail implementation:

• Creating the new attribute full name (full_name) as an extension of the entity person (person).
  • Edit the EntityDSL model (My1app.entity).
    • Add attribute full name (full_name) as variable of entity person (person)
    • Define the full name field as search text field using keyword domainKey.

    

• new graphic view of entity Person:

• mock data:

• • To make the using of this tutorial easier, the corresponding full name data in the person-data-object are already exist at the beginning of My1App. You only need to add the full name attribute in the person mock entity.

  

• Creating the new function (full_name_function) as an extension of the entity person (person), which fill the full name (full_name) from the first name (first_name) and last name (last_name).
  • Edit the EntityDSL model (My1app.entity).
    • Add the function (full_name_function) as a process of the entity person (person).
    • Fill the function with the annotations @javax.persistence.PrePersist and @javax.persistence.PreUpdate so that the content of the full name (full_name) will be filled when the attributes first name (first_name) and last name (last_name) are created or changed.

    

Test:

• After the creation of new attributes and functions, we can test the functionalities by calling up the person perspective via the menu entry of the person administration.

1. The full name should be filled from the first name and surname of a person .
   • Call up the Person Administration menu.
     • Open the employee perspective:
       • On the left side is the table of all persons.
       • On the right side is the persons dialog.
   • Edit a person.
     • Select an existing and already created person from the person table on the left side of the perspective.
       • Change the corresponding name attributes first name (first_name) and last name (last_name).
   • Save the changed personal data.
     • In the full name (full_name) field, the changed name appears.
2. The full-text-name search of a person by calling up the person perspective via the menu entry of the person administration.
   • Call up the Person Administration menu.
     • Open the employee perspective:
       • On the left side is the table of all persons.
       • On the right side is the persons dialog.
   • Find a person.
     • Enter the search term (name part) in the search field (full_name) in the persons dialog, and then all matching names will be shown as suggestion.
     • Select the name you want from the suggested names.

Establish current age

Target:

Introducing a transient attribute for entities and creating an individual data type.

Requirement:

As a user of the application, I would like to get the person's current age up-to-date, instead of always manually updating it.

User Task & User Story:

Process:

The age of a person (Person.age) should be always calculated from the date of birth and no longer be provided from the database as a fixed persisted value which must be manual-maintained regularly. Age is a transient attribute.

• Make a transient attribute from the existing attribute age(age), and it should be not persisted in the database and its content will be always calculated from the attribute birthdate (birthdate).
• In addition, we change the existing data type date (Date) to the individual data type of date Birthday (Birthdate), which in the future must not equals to zero and is only accurate to the day. It eliminates the time information.

Detail implementation:

• Change the existing data type date (Date) to the individual date data type Birthday (Birthdate), which in the future must not equals to zero and is only accurate to the day without time information.
  • Edit the DatatypeDSL model (My1app.datatype).
    • Add a new custom date type Birthdate.

    

  • Edit the EntityDSL model (My1app.entity).
    • Change the data type of the existing birthday attribute ('birthdate) from data type Date (Date) to the new data type Birthdate (Birthdate).

    

• The representation format of birthday without time information should be changed in the person table. We do this in the TableDSL.
  • Edit the TableDSL model (My1app.table).
    • Extending the table Person with a format SHORTDATE for the values of birthday (birthdate).

    

• Make a transient attribute from the existing attribute age, which is not persisted in the database and its content is always calculated from the attribute birthdate (birthdate).
  • Edit the EntityDSL model (My1app.entity).
    • Change the existing persistent attribute age (age) to a transient attribute.
      • Change the keyword var in derived.
      • The calculated current age is implemented as its return value.

      

• new graphic view of entity Person:

• mock data:

The age is no longer a persisted value , but is calculated from other data. As a result, no mocking data is required and everything related to the attribute age (Person.age) can be deleted from the EntityMockDSL instance.

Test:

To test the current age of a person, the person perspective must be called up via the menu entry of the person administration

• Call up the Person Administration menu.
  • Open the employee perspective:
    • On the left side is the table of all persons
    • On the right side is the persons dialog.
• Edit a person.
  • Select an existing and already created person from the person table on the left side of the perspective.
    • Change the birthday (birthdate) to the new format of the birthday without time information in the dialog.

    

    • You can also change the birthday (birthdate) to the new format of the birthday without time information only in the table.

    

• Save the changed personal data.
• In the field age, the current age appears.

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