Arch-03-21- Spring 中调用 Guice 中的注入

当 spring 和 guice 共同存在一个项目中，且 spring 中需要访问 guice 的注入时，这个方法似乎可以使用。

（1） spring 中配置转换的 factory

    <bean id="guiceBeanProvider" class="com.plusrun.util.GuiceBeanProviderFactory"/>

（2）GuiceBeanProviderFactory

package com.plusrun.util;

import com.google.inject.AbstractModule;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.name.Names;
import javax.servlet.ServletContext;
import org.apache.log4j.Logger;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.web.context.WebApplicationContext;

public class GuiceBeanProviderFactory<T> extends AbstractModule
  implements ApplicationContextAware, BeanFactoryAware
{
  private final Logger log = Logger.getLogger(GuiceBeanProviderFactory.class);
  protected WebApplicationContext applicationContext;
  protected static BeanFactory beanFactory;

  private static BeanFactory getBeanFactory()
  {
    return beanFactory;
  }

  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    if (!(applicationContext instanceof WebApplicationContext)) {
      this.log.warn("Application context is not instance of WebApplicationContext unable to provide Guice registersthrough Spring.");
    }

    this.applicationContext = ((WebApplicationContext)applicationContext);
  }

  public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
    this.beanFactory = beanFactory;
  }

  public T get(Class clazz) throws ClassNotFoundException
  {
    return (T) injector().getInstance(clazz);
  }

  public BeanProvider<T> getNamed(final Class clazz, final String name)
  {
    return new BeanProvider() {
      public Object get() {
        return GuiceBeanProviderFactory.this.injector().getInstance(Key.get(clazz, Names.named(name)));
      }
    };
  }

  protected void configure() {
    BeanFactory beanFactory = getBeanFactory();
    if (beanFactory != null) {
      bind(BeanFactory.class).toInstance(beanFactory);
    }
    else
      this.log.warn("BeanFactory not initialized Spring -> Guice Integration will not function");
  }

  protected Injector injector()
  {
    return (Injector)this.applicationContext.getServletContext().getAttribute("guice-injector");
  }
}

（3）spring 配置使用

    <bean id="iframeUriManager" scope="singleton" factory-bean="guiceBeanProvider" factory-method="get"
          lazy-init="true">
        <constructor-arg type="java.lang.Class" value="org.apache.shindig.gadgets.uri.IframeUriManager"/>
    </bean>