App Engine与Google Cloud Endpoints和Guice [英] Appengine with Google Cloud Endpoints and Guice

问题描述

所以我想在App Engine中使用Guice注入我的服务，或者是daos - 很常见我猜，但是我没有找到任何教程。

Appengine文档的官方版本似乎在这里： https://github.com/google/guice/wiki / GoogleAppEngine

配置Guice时，您可以设置com.google.inject.servlet.GuiceFilter来拦截每个请求/ *。在某些时候，您必须初始化模块。像文档说的一个好地方是ServletContextListener。

一种特殊类型的模块是ServletModules，它将请求路由到Servlet-Classes，而不是在web.xml中执行此操作，现在可以通过编程方式来执行此操作。 / p>

挺直直到这里。但是如何将Guice配置为也包括Endpoint-Class？

解决方案

原来，有一个GuiceSystemServiceServletModule可以正确处理。

  public class GuiceSSSModule extends GuiceSystemServiceServletModule {
 
 @Override 
 protected void configureServlets（） 
 super.configureServlets（）; 
 
设置< Class<？>> serviceClasses = new HashSet< Class<？>>（）; 
 serviceClasses.add（MyEndpoint.class）; 
 serviceClasses.add（AnotherAndpoint.class）; 
 this.serveGuiceSystemServiceServlet（/ _ ah / spi / *，serviceClasses）; 
} 
} 
  

将此模块包含在ServletContextListener中的注入器构造中：

  public class MyGSCL extends GuiceServletContextListener {
 
 @Override 
 protected Injector getInjector（） 
 return Guice.createInjector（new GuiceSSSModule（），new BaseModule（））; 
} 
} 
  

并在您的web.xml中使用此监听器： / p>

 < listener> 
< listener-class> de.mypkg.MyGSCL< / listener-class> 
< / listener> 
  

还要确保在您的web.xml中包含Guice过滤器：

 <！ -  GUICE  - > 
< filter> 
< filter-name> guiceFilter< / filter-name> 
< filter-class> com.google.inject.servlet.GuiceFilter< / filter-class> 
< / filter> 
< filter-mapping> 
< filter-name> guiceFilter< / filter-name> 
< url-pattern> / *< / url-pattern> 
< / filter-mapping> 
  

您的端点将在/ _ah / api / ...下可用，您可以使用@Inject在你的端点类。

So i want to use Guice in Appengine with Cloud Endpoints to inject my services, or daos - pretty common I guess, but I found no tutorial for this.

Official Guice for Appengine documentation seems to be here: https://github.com/google/guice/wiki/GoogleAppEngine

When configuring Guice you set up the com.google.inject.servlet.GuiceFilter to intercept every request "/*". And at some point you must initialize the modules. Like the documentation says a good place to do that is a ServletContextListener.

One special kind of Module are ServletModules, that map request-Paths to Servlet-Classes, instead of doing this in the web.xml you can now do this programmatically.

Pretty straight forward up until here. But how do I configure Guice to also include the Endpoint-Classes?

解决方案

Turns out there is a GuiceSystemServiceServletModule that handles exactly this.

public class GuiceSSSModule extends GuiceSystemServiceServletModule {

  @Override
  protected void configureServlets() {
    super.configureServlets();

    Set<Class<?>> serviceClasses = new HashSet<Class<?>>();
    serviceClasses.add(MyEndpoint.class);
    serviceClasses.add(AnotherAndpoint.class);
    this.serveGuiceSystemServiceServlet("/_ah/spi/*", serviceClasses);
  }
}

Include this module in the Injector construction in your ServletContextListener:

public class MyGSCL extends GuiceServletContextListener {

  @Override
  protected Injector getInjector() {
    return Guice.createInjector(new GuiceSSSModule(), new BaseModule());
  }
}

and use this listener in your web.xml:

<listener>
   <listener-class>de.mypkg.MyGSCL</listener-class>
</listener>

Also make sure to include the Guice filter in your web.xml:

<!-- GUICE -->
<filter>
    <filter-name>guiceFilter</filter-name>
    <filter-class>com.google.inject.servlet.GuiceFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>guiceFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

Your endpoints will be available under /_ah/api/... again and you can use @Inject in your endpoint classes.

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