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Authored by:

Andres Almiray
aalmiray@yahoo.com

The ActiveJdbc plugin enables lightweight access to MySql, Postgres, Oracle and H2 datasources using Activejdbc. This plugin does NOT provide domain classes nor dynamic finders like GORM does.

Usage

Upon installation the plugin will generate the following artifacts in $appdir/griffon-app/conf:

  • DataSource.groovy - contains the datasource and pool definitions. Its format is equal to GORM's requirements. Additional configuration for this artifact is explained in the Activejdbc Plugin.
  • BootstrapActivejdbc.groovy - defines init/destroy hooks for data to be manipulated during app startup/shutdown.

A new dynamic method named withActivejdbc will be injected into all controllers, giving you access to a org.javalite.activejdbc.Base object, with which you'll be able to make calls to the database. Remember to make all database calls off the UI thread otherwise your application may appear unresponsive when doing long computations inside the UI thread.

This method is aware of multiple dataSources. If no dataSourceName is specified when calling it then the default dataSource will be selected. Here are two example usages, the first queries against the default dataSource while the second queries a dataSource whose name has been configured as 'internal'

package sample
class SampleController {
    def queryAllDatabases = {
        withActivejdbc { dataSourceName -> ... }
        withActivejdbc('internal') { dataSourceName -> ... }
    }
}

The following list enumerates all the variants of the injected method

  • <R> R withActivejdbc(Closure<R> stmts)
  • <R> R withActivejdbc(CallableWithArgs<R> stmts)
  • <R> R withActivejdbc(String dataSourceName, Closure<R> stmts)
  • <R> R withActivejdbc(String dataSourceName, CallableWithArgs<R> stmts)

These methods are also accessible to any component through the singleton griffon.plugins.activejdbc.ActivejdbcEnhancer. You can inject these methods to non-artifacts via metaclasses. Simply grab hold of a particular metaclass and call ActivejdbcEnhancer.enhance(metaClassInstance).

Configuration

ActivejdbcAware AST Transformation

The preferred way to mark a class for method injection is by annotating it with @griffon.plugins.activejdbc.ActivejdbcAware. This transformation injects the griffon.plugins.activejdbc.ActivejdbcContributionHandler interface and default behavior that fulfills the contract.

Dynamic Method Injection

Dynamic methods will be added to controllers by default. You can change this setting by adding a configuration flag in griffon-app/conf/Config.groovy

griffon.activejdbc.injectInto = ['controller', 'service']

Dynamic method injection will be skipped for classes implementing griffon.plugins.activejdbc.ActivejdbcContributionHandler.

Events

The following events will be triggered by this addon

  • ActivejdbcConnectStart[dataSourceName, dataSource] - triggered before connecting to the database
  • ActivejdbcConnectEnd[dataSourceName, dataSource] - triggered after connecting to the database
  • ActivejdbcDisconnectStart[dataSourceName, dataSource] - triggered before disconnecting from the database
  • ActivejdbcDisconnectEnd[dataSourceName, dataSource] - triggered after disconnecting from the database

This plugin relies on the facilities exposed by the datasource plugin.

Connect at Startup

The plugin will attempt a connection to the default database at startup. If this behavior is not desired then specify the following configuration flag in Config.groovy

griffon.activejdbc.connect.onstartup = false

Example

A trivial sample application can be found at https://github.com/aalmiray/griffon_sample_apps/tree/master/persistence/activejdbc

Scripts

  • activejdbc-instrument - collects information of model classes and enhances their bytecode with ActiveJdbc specific calls.

This script will be called automatically after sources have been compiled. If any of the model classes are updated or new model classes are added then you must clean all compiled sources.

Testing

Dynamic methods will not be automatically injected during unit testing, because addons are simply not initialized for this kind of tests. However you can use ActivejdbcEnhancer.enhance(metaClassInstance, activejdbcProviderInstance) where activejdbcProviderInstance is of type griffon.plugins.activejdbc.ActivejdbcProvider. The contract for this interface looks like this

public interface ActivejdbcProvider {
    <R> R withActivejdbc(Closure<R> closure);
    <R> R withActivejdbc(CallableWithArgs<R> callable);
    <R> R withActivejdbc(String dataSourceName, Closure<R> closure);
    <R> R withActivejdbc(String dataSourceName, CallableWithArgs<R> callable);
}

It's up to you define how these methods need to be implemented for your tests. For example, here's an implementation that never fails regardless of the arguments it receives

class MyActivejdbcProvider implements ActivejdbcProvider {
    public <R> R withActivejdbc(Closure<R> closure) { null }
    public <R> R withActivejdbc(CallableWithArgs<R> callable) { null }
    public <R> R withActivejdbc(String dataSourceName, Closure<R> closure) { null }
    public <R> R withActivejdbc(String dataSourceName, CallableWithArgs<R> callable) { null }
}

This implementation may be used in the following way

class MyServiceTests extends GriffonUnitTestCase {
    void testSmokeAndMirrors() {
        MyService service = new MyService()
        ActivejdbcEnhancer.enhance(service.metaClass, new MyActivejdbcProvider())
        // exercise service methods
    }
}

On the other hand, if the service is annotated with @ActivejdbcAware then usage of ActivejdbcEnhancer should be avoided at all costs. Simply set activejdbcProviderInstance on the service instance directly, like so, first the service definition

@griffon.plugins.activejdbc.ActivejdbcAware
class MyService {
    def serviceMethod() { ... }
}

Next is the test

class MyServiceTests extends GriffonUnitTestCase {
    void testSmokeAndMirrors() {
        MyService service = new MyService()
        service.activejdbcProvider = new MyActivejdbcProvider()
        // exercise service methods
    }
}

Tool Support

DSL Descriptors

This plugin provides DSL descriptors for Intellij IDEA and Eclipse (provided you have the Groovy Eclipse plugin installed). These descriptors are found inside the griffon-activejdbccompile-x.y.z.jar, with locations

  • dsdl/activejdbc.dsld
  • gdsl/activejdbc.gdsl

Lombok Support

Rewriting Java AST in a similar fashion to Groovy AST transformations is possible thanks to the lombok plugin.

JavaC

Support for this compiler is provided out-of-the-box by the command line tools. There's no additional configuration required.

Eclipse

Follow the steps found in the Lombok plugin for setting up Eclipse up to number 5.

  1. Go to the path where the lombok.jar was copied. This path is either found inside the Eclipse installation directory or in your local settings. Copy the following file from the project's working directory

     $ cp $USER_HOME/.griffon/<version>/projects/<project>/plugins/activejdbc<version>/dist/griffon-activejdbccompile-<version>.jar .
    
  2. Edit the launch script for Eclipse and tweak the boothclasspath entry so that includes the file you just copied

    -Xbootclasspath/a:lombok.jar:lombok-pg-<version>.jar:        griffon-lombok-compile-<version>.jar:griffon-activejdbccompile-<version>.jar
    
  3. Launch Eclipse once more. Eclipse should be able to provide content assist for Java classes annotated with @ActivejdbcAware.

NetBeans

Follow the instructions found in Annotation Processors Support in the NetBeans IDE, Part I: Using Project Lombok. You may need to specify lombok.core.AnnotationProcessor in the list of Annotation Processors.

NetBeans should be able to provide code suggestions on Java classes annotated with @ActivejdbcAware.

Intellij IDEA

Follow the steps found in the Lombok plugin for setting up Intellij IDEA up to number 5.

  1. Copy griffon-activejdbccompile-<version>.jar to the lib directory

     $ pwd
       $USER_HOME/Library/Application Support/IntelliJIdea11/lombok-plugin
     $ cp $USER_HOME/.griffon/<version>/projects/<project>/plugins/activejdbc<version>/dist/griffon-activejdbccompile-<version>.jar lib
    
  2. Launch IntelliJ IDEA once more. Code completion should work now for Java classes annotated with @ActivejdbcAware.