guice注入器getInstance注释的单例实例

Question

我正在使用Restice和Guice。

一个CachedThreadPool的肺癌在我的吉斯：

@Provides 
@Singleton 
@Named("name0") 
public ExecutorService provideAutoDisconnectThreadPool() { 
    return Executors.newCachedThreadPool(); 
} 

本想关闭线程池当服务器停止，所以在我restlet.Application，我用注射器来获得实例：

@Override 
public void stop() throws Exception { 
    LOGGER.info("stopping..."); 
    // shutdown threadPool 
    injector.getInstance(ExecutorService.class).shutdown(); 
    super.stop(); 
    LOGGER.info("stopped"); 
} 

然而，该方案得到了与错误：

com.google.inject.ConfigurationException: Guice configuration errors: 

1) No implementation for java.util.concurrent.ExecutorService was bound. 
while locating java.util.concurrent.ExecutorService 

1 error 
at com.google.inject.internal.InjectorImpl.getProvider(InjectorImpl.java:1004) 
at com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1009) 

所以，我怎么能得到应用程序停止时的threadPool实例。

Answer 1

Named是binding annotation，所以在这种情况下，注入键是ExecutorService.class和@Named("name0")：

injector.getInstance(Key.get(ExecutorService.class, Names.named("name0")))