teverett / simpleioc

A simple IOC container

Simple IOC

Introduction

SimpleIOC is a framework for configuring autowire (JSR330) beans using XML.

Configurable bean properties include

• caching (singleton)
• ThreadLocal beans
• autocreation

Defining a Bean in code:

@RegistryBean(name = "regBean", cached=false, autocreate=true)
public class ExampleAnnotatedBean {
}

Injection via JSR330

@Inject()
@Named("fuddleduddle")
private SampleInjectedInterface interface2;

Construction filters can be used by SimpleIOC to wrap beans in arbitrary dynamic proxies at construction time.

A typical example is using cglib to define a dynamic proxy which can be used to implement a custom annotation such as @Transactional

Finding a bean in code

final IOCBeanRegistry autobeanRegistry = new DefaultIOCBeanRegistry();
autobeanRegistry.load("beans.xml");
/*
 * populate the beans we need
 */
jcrPersistenceContext = (JcrPersistenceContext) autobeanRegistry.getBean("jcrpersistencecontext");

Defining Construction filters.

public class ExampleProxyCreatingFilter implements IOCInstantiationFilter {
	public Object filter(IOCBeanRegistry iocBeanRegistry, Object object, Bean bean) throws IOCException {
		try {
			return Proxy.newProxyInstance(object.getClass().getClassLoader(), object.getClass().getInterfaces(), new DebugProxy(object));
		} catch (final Exception e) {
			throw new IOCException("Exception in filter", e);
		}
	}
}

Addons Available

• simpleioc-struts. Support for injection of JSR330 beans into Strut2 Actions
• simpleioc-testng. Support for TestNG Testing
• simpleioc-junit. Support for JUnit Testing
• simpleioc-servlet. Support for Servlets