Customizing GreenPepper fixture resolution

Prerequisite

To change fixtures resolutions you need to define a custom system under development

Changing how is finding your Fixtures

This could be useful when you are using for example an IOC, like Spring or just when you want to add locations (packages in java, namespaces in .Net) for can resolve your fixtures.

Only for specifying location to resolve fixtures (packages in java, namespaces in .Net)

public static class CustomSystemUnderDevelopment extends DefaultSystemUnderDevelopment
    {
        public CustomSystemUnderDevelopment( String... params )
        {
           super.addImport("com.mycompany.fixtures");
           super.addImport("com.mycompany.specials.fixtures");
        }
    }

By this custom system under development you tell to look in "com.mycompany.fixtures" and "com.mycompany.specials.fixtures" to resolve fixtures in specfications that your are running.

Changing Fixture instanciation mechanism (Spring example)

The Spring container system under development

Spring is an Inversion Of Control (IOC) container get more information about it on Spring website

SpringSystemUnderDevelopment code can be found in greenpepper-extensions-spring: SpringSystemUnderDevelopment.java

package com.greenpepper.extensions.spring;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.support.RootBeanDefinition;

import com.greenpepper.reflect.DefaultFixture;
import com.greenpepper.reflect.Fixture;
import com.greenpepper.systemunderdevelopment.DefaultSystemUnderDevelopment;

public class SpringSystemUnderDevelopment extends DefaultSystemUnderDevelopment
{
    private BeanFactory beanFactory;

    public SpringSystemUnderDevelopment(String... applicationCtxes)
    {
        this.beanFactory = new GreenPepperXMLAplicationContext(applicationCtxes).getBeanFactory();
    }
	
    public SpringSystemUnderDevelopment(BeanFactory beanFactory)
    {
        this.beanFactory = beanFactory;
    }

    @Override
    public Fixture getFixture(String fixtureName, String... params) throws Throwable
    {
		Fixture fixture;
		if (params.length != 0)
        {
		    // When params are used, we use the PlainOldSystemUnderDevelopment to instantiate the fixture
			// these params are passed to the constructor
            fixture = super.getFixture(fixtureName, params);
        }
		else
		{
	        try
	        {
	            fixture = new DefaultFixture(beanFactory.getBean(fixtureName));
	        }
	        catch (NoSuchBeanDefinitionException e)
	        {
	            fixture = new DefaultFixture(instantiateAsAutowiredBean(fixtureName));
	        }
		}
		
		return fixture;
    }

    private Object instantiateAsAutowiredBean(String fixtureName) throws Exception
    {
        Class fixtureClass = loadType(fixtureName).getUnderlyingClass();

        BeanDefinition beanDef = new RootBeanDefinition(fixtureClass, RootBeanDefinition.AUTOWIRE_AUTODETECT);
        
        DefaultListableBeanFactory fallFactory = new DefaultListableBeanFactory(beanFactory);
        fallFactory.registerBeanDefinition(fixtureName, beanDef);

        return fallFactory.getBean(fixtureName);
    }
}