pureMVC 实例

package flex.spring; import org.springframework.context.ApplicationContext; import org.springframework.web.context.support.WebApplicationContextUtils; import org.springframework.beans.BeansException; import org.springframework.beans.factory.NoSuchBeanDefinitionException; import flex.messaging.FactoryInstance; import flex.messaging.FlexFactory; import flex.messaging.config.ConfigMap; import flex.messaging.services.ServiceException; /** * This interface is implemented by factory components which provide * instances to the flex messaging framework. To configure flex data services * to use this factory, add the following lines to your services-config.xml * file (located in the WEB-INF/flex directory of your web application). * * &lt;factories&gt; * &lt;factory id="spring" class="flex.samples.factories.SpringFactory" /&gt; * &lt;/factories&gt; * * You also must configure the web application to use spring and must copy the spring.jar * file into your WEB-INF/lib directory. To configure your app server to use spring, * you add the following lines to your WEB-INF/web.xml file: * * &lt;context-param&gt; * &lt;param-name&gt;contextConfigLocation&lt;/param-name&gt; * &lt;param-value&gt;/WEB-INF/applicationContext.xml&lt;/param-value&gt; * &lt;/context-param&gt; * * &lt;listener&gt; * &lt;listener-class&gt;org.springframework.web.context.ContextLoaderListener&lt;/listener-class&gt; * &lt;/listener&gt; * * Then you put your spring bean configuration in WEB-INF/applicationContext.xml (as per the * line above). For example: * * &lt;?xml version="1.0" encoding="UTF-8"?&gt; * &lt;!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"&gt; * * &lt;beans&gt; * &lt;bean name="weatherBean" class="dev.weather.WeatherService" singleton="true"/&gt; * &lt;/beans&gt; * * Now you are ready to define a destination in flex that maps to this existing service. * To do this you'd add this to your WEB-INF/flex/remoting-config.xml: * * &lt;destination id="WeatherService"&gt; * &lt;properties&gt; * &lt;factory&gt;spring&lt;/factory&gt; * &lt;source&gt;weatherBean&lt;/source&gt; * &lt;/properties&gt; * &lt;/destination&gt; * * @author Jeff Vroom */ public class SpringFactory implements FlexFactory { private static final String SOURCE = "source"; /** * This method can be used to initialize the factory itself. It is called with configuration * parameters from the factory tag which defines the id of the factory. */ public void initialize(String id, ConfigMap configMap) {} /** * This method is called when we initialize the definition of an instance * which will be looked up by this factory. It should validate that * the properties supplied are valid to define an instance. * Any valid properties used for this configuration must be accessed to * avoid warnings about unused configuration elements. If your factory * is only used for application scoped components, this method can simply * return a factory instance which delegates the creation of the component * to the FactoryInstance's lookup method. */ public FactoryInstance createFactoryInstance(String id, ConfigMap properties) { SpringFactoryInstance instance = new SpringFactoryInstance(this, id, properties); instance.setSource(properties.getPropertyAsString(SOURCE, instance.getId())); return instance; } // end method createFactoryInstance() /** * Returns the instance specified by the source * and properties arguments. For the factory, this may mean * constructing a new instance, optionally registering it in some other * name space such as the session or JNDI, and then returning it * or it may mean creating a new instance and returning it. * This method is called for each request to operate on the * given item by the system so it should be relatively efficient. * <p> * If your factory does not support the scope property, it * report an error if scope is supplied in the properties * for this instance. */ public Object lookup(FactoryInstance inst) { SpringFactoryInstance factoryInstance = (SpringFactoryInstance) inst; return factoryInstance.lookup(); } static class SpringFactoryInstance extends FactoryInstance { SpringFactoryInstance(SpringFactory factory, String id, ConfigMap properties) { super(factory, id, properties); } public String toString() { return "SpringFactory instance for id=" + getId() + " source=" + getSource() + " scope=" + getScope(); } public Object lookup() { ApplicationContext appContext = WebApplicationContextUtils.getWebApplicationContext(flex.messaging.FlexContext.getServletConfig().getServletContext()); String beanName = getSource(); try { return appContext.getBean(beanName); } catch (NoSuchBeanDefinitionException nexc) { ServiceException e = new ServiceException(); String msg = "Spring service named '" + beanName + "' does not exist."; e.setMessage(msg); e.setRootCause(nexc); e.setDetails(msg); e.setCode("Server.Processing"); throw e; } catch (BeansException bexc) { ServiceException e = new ServiceException(); String msg = "Unable to create Spring service named '" + beanName + "' "; e.setMessage(msg); e.setRootCause(bexc); e.setDetails(msg); e.setCode("Server.Processing"); throw e; } } } }