Dali Developer Documentation

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Contents

Dali Java Persistence Tools – Developer Documentation

Archive


Repository info

http://git.eclipse.org/c/dali/webtools.dali.git

NB: Ensure the Eclipse network proxy is configured, if applicable (Preferences > General > Network Connections)

Development Workspace

To set up an Eclipse IDE workspace for working on Dali, perform the following steps:

eclipse.exe -vm C:\jdk\1.6.0_23\bin\javaw.exe -data C:\dev\dali -vmargs -Xmx768M -XX:MaxPermSize=256M
  • Add the appropriate Execution Environment to the host platform
    • If necessary, download and install the final J2SE 1.5 JRE or JDK (http://www.oracle.com/technetwork/java/javase/downloads/index.html)
    • Start the host platform
    • Add an Installed JRE (Preferences > Java > Installed JREs)
      • <Standard VM>
      • Select the directory holding the just-installed JRE/JDK
    • NB: This Java installation must be version 1.5. WTP requires Dali to execute on a 1.5 JVM. Installing and using a 1.5 JRE/JDK reduces the possibility of any errors slipping through (e.g. using classes or methods added in later versions of Java). The host platform can be run on a later version of Java; but the Dali plug-ins must be compiled against and capable of executing on Java 1.5. Each Dali project's build path and project-specific Java compiler settings ensure Dali is compiled with Java 1.5 compliance; but there must be a Java 1.5 installation present for the compiler to compile against the correct Java jars.
    • NB: The JPA Diagram Editor compiles against Java 1.5; but it requires a Java 1.6 Execution Environment. This is because its prerequisite Graphiti requires a Java 1.6 Execution Environment.
    • NB: The JAXB test plug-ins compile against Java 1.5; but they require a Java 1.6 Execution Environment. This is because the javax.xml.bind annotations ship with the Java 1.6 Execution Environment.
  • Set up a target platform
    • Download the latest WTP Integration Build and all of its dependencies (http://download.eclipse.org/webtools/downloads/)
      • Eclipse SDK
      • EMF and XSD SDK
      • GEF SDK
      • DTP SDK
      • EMF Transaction
      • EMF Validation
      • Graphiti
      • Orbit
      • WTP SDK
    • Unzip all the downloaded files (except the Graphiti and Orbit files) into the same directory (This directory is different than the directory holding the host platform created above.)
  • Configure the host platform to use the target platform for building plug-ins
    • Start the host platform
    • Add a target platform (Preferences > Plug-in Development > Target Platform)
      • <Add...> a new Target definition
      • Initialize the target definition with <Nothing>
      • <Add...> a new location for the target platform
        • <Directory>
        • Select the directory holding the target platform (i.e. the directory holding the just-unzipped WTP files and pre-requisites)
        • NB: The new location should indicate it has over 1000 plug-ins available
      • <Add...> another location for the Orbit repository
        • <Software Site>
        • <Add...> a new repository
          • <Archive...>
          • Select the just-downloaded Orbit zip file
        • <Work with:> the just-added Orbit repository
        • NB: Make sure <Group by Category> is checked.
        • Select "All Orbit Bundles" => "EasyMock"
        • NB: The new location should indicate it has 2 plug-ins available
      • <Add...> another location for the Graphiti repository
        • <Software Site>
        • <Add...> a new repository
          • <Archive...>
          • Select the just-downloaded Graphiti zip file
        • <Work with:> the just-added Graphiti repository
        • NB: Make sure <Include required software> is unchecked. (Graphiti requires the EMF Transaction plug-in, which is already part of the target platform location added above.)
        • Select "Graphiti SDK" (or "Graphiti" => "Graphiti SDK" if grouped by categories.)
        • NB: The new location should indicate it has 20 plug-ins available
      • <Finish> the wizard to create the new target platform
  • Optional (but very helpful): Configure the host platform to include the classes from the target platform (Preferences > Plug-in Development > Include all plug-ins from target in Java search)
  • Clone the Eclipse Foundation-hosted Dali Git repository and import the Dali projects
    • Ensure the Eclipse network proxy is configured, if applicable (Preferences > General > Network Connections)
    • Open the Git Repository Exploring perspective
    • Clone the Dali repository using the appropriate URL from http://git.eclipse.org/c/dali/webtools.dali.git
    • Import the plug-in and test plug-in projects in the repository's working directory (The projects are named org.eclipse.jpt.*.):
      • common/plugins - the *.branding projects are optional
      • common/tests
      • jaxb/plugins - the *.branding projects are optional
      • jaxb/tests
      • jpa/plugins - the *.branding projects are optional
      • jpa/tests
      • jpa_diagram_editor/plugins
      • jpa_diagram_editor/tests

Executing JUnit Tests

Once the development workspace is configured and the Dali plug-ins built, it is possible to execute the Dali tests.

Generic JPA Core Tests

  • Add a run configuration (Run > Run Configurations... > JUnit Plug-in Test > New)
    • <Test> tab
      • <Run a single test>
        • Project: org.eclipse.jpt.jpa.core.tests
        • Test Class: org.eclipse.jpt.jpa.core.tests.internal.JptJpaCoreTests
      • Test Runner: JUnit 3 or 4
    • <Main> tab
      • <Program to run>
        • Run an application: [No Application] - Headless mode
    • <Arguments> tab
      • VM arguments:
-Xmx768M
-XX:MaxPermSize=256M
-Dorg.eclipse.jpt.jpa.jar=<path to jar containing javax.persistence packages>
  • <Run>

NB: These tests may take on the order of 30 minutes to complete.

EclipseLink JPA Core Tests

Duplicate the Generic JPA Core Tests configuration described above and make the following modifications:

  • <Test> tab
    • Project: org.eclipse.jpt.jpa.eclipselink.core.tests
    • Test class: org.eclipse.jpt.jpa.eclipselink.core.tests.internal.JptJpaEclipseLinkCoreTests
  • <Arguments> tab
    • Add the following VM argument:
-Dorg.eclipse.jpt.eclipselink.jar=<path to eclipselink.jar>

JaxbCoreTests

  • Same basic setup as JptCore and EcliseLinkCore tests
    • Project: org.eclipse.jpt.jaxb.core.tests
    • Test Class: org.eclipse.jpt.jaxb.core.tests.internal.JaxbCoreTests
  • On the Arguments tab
    • Make sure the following VM arguments are specified:
-Xmx512M -Dhttp.proxyHost=www-proxy.us.oracle.com -Dhttp.proxyPort=80

JptUtilityTests

  • Create a new Launch Config under the "JUnit" category
  • Run a single test
    • Project: org.eclipse.jpt.common.utility.tests
    • Test Class: org.eclipse.jpt.common.utility.tests.internal.JptCommonUtilityTests
  • No other configuration is needed

Major Features

JPA Structure View

  • Contains the elements of an Entity
  • Visual representation
  • Allows navigation of JPA Details view

JPA Details View

  • Provides rich UI for the editing of persistence related metadata
  • Unified editing for Java annotation and orm.xml
  • Provides defaults values for JPA metadata

Validation

  • Validation in the form of “Problems” are reported based on the state of the Persistence Unit

Entity Generation from Tables

  • Generates spec compliant Entities from tables defined in the DTP database definition model



Dali Terminology

Resource Model: A resource model directly reflects a given resource (Java source or XML source). Dali currently maintains three resource models, including one for persistence.xml, the XML mapping file(s), and one for JPA Annotations. For XML resources(Mapping File or persistence.xml) this is a generated EMF model that uses the WTP translator framework to read/write the XML source. On the Java side it is a non-EMF object model that represents the JPA Annotations on the Java Types and Attributes.

Context Model: A context model represents only the non-resource related JPA metadata. Dali currently maintains three context models, including one for persistence.xml, the XML mapping file(s), and one for JPA Annotations. It pulls together the persistence.xml, XML Mapping File and Java resource models and uses common API. As and example, it gives context to the Java Annotations so that a JavaResourcePersistentType in the resource model with Entity, Table, SecondaryTable annotations on it becomes a PersistentType with an Entity TypeMapping in the context model. The context model interfaces are used by the Dali UI and adopters.

Persistent Type: Any Java Type that will be persisted.

Persistent Attribute: Any Java Attribute that will be persisted.

Mapping: A collection of related JPA metadata that consists of a persistence strategy for a given Type or Attribute.

Type Mapping: A specific way of persisting a Persistent Type, for example, Enity, Mapped Superclass, or Embeddable. All JPA metadata specified at the Type level will be contained by this Type Mapping.

Attribute Mapping: A specific way of persisting a Persistent Attribute, for example, Basic, ManyToOne, or OneToMany. All JPA metadata specified at the Attribute level will be contained by this Attribute Mapping.

Model usage examples

Traversing the Context model for JPA metadata

To access the JPA metadata for a type listed in the persistence.xml file:

IProject.getAdapter(JpaProject.class) : JpaProject
  JpaProject.getRootContextNode() : JpaRootContextNode
    JpaRootContextNode.getPersistenceXml(): PersistenceXml
      PersistenceXml.getPersistence() : Persistence
        Persistence.getPersistenceUnits() : Iterable<PersistenceUnit>
              (this will contain 0 or 1 PersistenceUnits as Dali does not support multiple persistence units)
          PersistenceUnit.getClassRefs() : Iterable<ClassRef>
            ClassRef.getJavaPersistentType() : JavaPersistentType
              JavaPersistentType.getMapping() : JavaTypeMapping
              JavaPersistentType.getAttributes() : Iterable<JavaPersistentAttribute>
                JavaPersistentAttribute.getMapping() : JavaAttributeMapping

To access the JPA metadata for a type listed in an orm.xml file:

...
PersistenceUnit.getMappingFileRefs() : Iterable<MappingFileRef>
  MappingFileRef.getMappingFile() : MappingFile
    MappingFile.getPersistentTypes() : Iterable<PersistentType>
...

Retrieving the JPA Entities for a Project

public static Iterable<PersistentType> getEntities(IProject project) {
    JpaProject jpaProject = (JpaProject) project.getAdapter(JpaProject.class);
    if (jpaProject == null) {
        return Collections.emptySet();
    }

    JpaRootContextNode rootContextNode = jpaProject.getRootContextNode();
    PersistenceXml persistenceXml = rootContextNode.getPersistenceXml();
    if (persistenceXml == null) {
        return Collections.emptySet();
    }

    Persistence persistence = persistenceXml.getPersistence();
    if (persistence == null) {
        return Collections.emptySet();
    }

    if (persistence.getPersistenceUnitsSize() == 0) {
        return Collections.emptySet();
    }

    PersistenceUnit persistenceUnit = persistence.getPersistenceUnit(0);
    ArrayList<PersistentType> entities = new ArrayList<PersistentType>();
    for (PersistentType persistentTypes : persistenceUnit.getPersistentTypes()) {
        if (persistentTypes.getMappingKey() == MappingKeys.ENTITY_TYPE_MAPPING_KEY) {
            entities.add(persistentTypes);
        }
    }
    return entities;
}

Changing the Context model programatically

If you are changing the model outside the UI thread you will need to configure the JPA project to make modifications on the UI thread as necessary. See JpaProject#setThreadLocalModifySharedDocumentCommandExecutor(CommandExecutor).

Also note the model is "updated" asynchronously with every change. If you want these updates to happen synchronously, you will need to set the JPA project's "updater". See JpaProject#setUpdater(Updater). Note the comments in SynchronousJpaProjectUpdater.

Core Dali Plug-ins

org.eclipse.jpt.*.core

Description: Resource model and Context model interfaces and implementations


org.eclipse.jpt.jpa.db

Description: DTP wrapper model, serves as Dali’s interface to the DTP DB model.


org.eclipse.jpt.jpa.db.ui

Description: Dali UI for DTP Connection Wizard


org.eclipse.jpt.doc.isv

Description: Javadoc plugin


org.eclipse.jpt.doc.user

Description: User docs and infopop for Dali


org.eclipse.jpt.jpa.gen

Description: Contains model and generator code for generating Entities from tables


org.eclipse.jpt.*.ui

Description: Contains the actions, composites, data models, wizards, views, and perspective that make up the Dali UI.


org.eclipse.jpt.utility

Description: A set of utility classes for the Dali plug-in. Contains a set of advanced iterators, change support, SWT Value Models, plus utilities for dealing with Files, Strings, Collections, etc.

No Dependencies.


org.eclipse.jpt.*.eclipselink.core

Description: EclipseLink extension, including an EclipseLinkPlatform and the EclipseLink context model.


org.eclipse.jpt.*.eclipselink.ui

Description: EclipseLink UI extension, including an EclipseLinkPlatformUI and associated EclipseLink UI composites.


org.eclipse.jpt.*.core.tests

Description: Contains a suite of headless JUnit tests for the core plug-ins.


org.eclipse.jpt.utility.tests

Description: Contains a comprehensive set of tests for the Utility classes.

Major Integration points

JDT

  • The Dali Core makes extensive use of the JDT Core model and utilities for the purpose of reading and writing Java class metadata.
  • Code Completion

DTP

The Dali DB and DDL plug-ins make use of the data definition mode and the New Connection Wizard. The Datasource Explorer view is an integral part of the Dali Persistence Perspective.

WTP

  • Facets
  • EMF-XML Translator Framework

Platform

  • Project Explorer


Extension Mechanism

Dali's main extension mechanism is the JpaPlatform Interface and extension point.

This interface is to be implemented by a JPA vendor to provide extensions to the core JPA model. The core JPA model will provide functionality for JPA spec annotations in java, persistence.xml and (orm.xml) mapping files. The org.eclipse.jpt.core.genericPlatform extension supplies resource models for those file types. As another vendor option you will have to supply those resource models as well or different ones as necessary.

The extension designates a Platform ID, Label, Class (implemenation of JpaPlatform), and an option to set the platform as a "Default" platform.

Extension Example:

  <extension
         point="org.eclipse.jpt.core.jpaPlatform">
      <jpaPlatform
            class="org.eclipse.jpt.eclipselink.core.internal.EclipseLinkPlatform"
            id="org.eclipse.eclipselink.platform"
            label="EclipseLink">
      </jpaPlatform>
   </extension>

See the EclipseLinkPlatform included in Dali as an exemplary implementation.

Statement on API

Provisional API is available as of the 2.0 release.