Question

我正在寻找一种方法来覆盖GuiceServletContextListener中与guice绑定的球衣资源。我的代码，我正在努力工作：

//Define Jersey resource interface
@Path("/books/{key}")
public interface BookDocument {

    public BookDAO getDao();

    public void setDao(BookDAO dao);
}

//Define default implementation
public class BookImpl implements Book {

    @Override
    public BookDAO getDao() {
        return dao;
    }

    @Inject
    @Override
    public void setDao(BookDAO dao) {
        this.dao = dao;
    }
}

//User wants to inject his implementation, so he define it
public class BookUserImpl implements Book {

    @Override
    public BookDAO getDao() {
        return dao;
    }

    @Inject
    @Override
    public void setDao(BookDAO dao) {
        this.dao = dao;
    }
}

//Inject default implementation of resource
public class ApplicationResourcesModule extends AbstractModule
{
    @Override
    protected void configure()
    {
        bind(Book).to(BookImpl);
    }
}

//But user wants to inject his implementation, so he bind it in users AbstractModule
public class ApplicationResourcesModuleUser extends AbstractModule
{
    @Override
    protected void configure()
    {
        bind(Book).to(BookUserImpl);
    }
}

//Bind all resources
public class JerseyGuiceConfig extends GuiceServletContextListener
{
    @Override
    protected Injector getInjector()
    {
        //Override default binding by user bindings.
        return Guice.createInjector(Modules.override(new ApplicationResourcesModule()).with(new ApplicationResourcesModuleUser()), new JerseyServletModule());
    }
}

但不幸的是，这不起作用，而我无法将jersey绑定到类似接口的guice资源，只有bind(BookImpl.class)工作。但这种绑定是不可能覆盖的。如果我尝试使用bind(BookImpl.class)覆盖bind(BookUserImpl.class)，则会收到错误Conflicting URI templates. The URI template /books/{key} for root resource class.，而@Path应该是唯一的。那么我的用例有什么解决方案吗？

Answer 1

我只是不想警告你Modules.override不适用于Guice.createInjector（Stage.PRODUCTION，...）所以你应该只为开发小心使用它。您应该创建两个上下文侦听器，并以某种方式（通过maven配置文件说）设置web.xml并进行适当的实现。

最好使用：

//Inject default implementation of resource
public class MainModule extends AbstractModule
{
    @Override
    protected void configure()
    {
        if(currentStage().equals(Stage.PRODUCTION) {
          install(new ApplicationResourcesModuleUser());
        } else {
          install(new ApplicationResourcesModule());
        }
    }
}

//Bind all resources
public class JerseyGuiceConfigPROD extends GuiceServletContextListener
{
    @Override
    protected Injector getInjector()
    {
        //Override default binding by user bindings.
        return Guice.createInjector(Stage.PRODUCTION, new MainModule(), new JerseyServletModule());
    }
}

public class JerseyGuiceConfigDEV extends GuiceServletContextListener
{
    @Override
    protected Injector getInjector()
    {
        //Override default binding by user bindings.
        return Guice.createInjector(Stage.DEVELOPMENT, new MainModule(), new JerseyServletModule());
    }
}

您可以在界面中使用@ImplementedBy注释来说明默认实现。因此，您不必显式绑定它，如果绑定它，它将覆盖注释绑定。

@Path("/books/{key}")
@ImplementedBy(BookImpl.class)
public interface Book {

    public BookDAO getDao();

    @Inject //it is enough to put the injection here, i think
    public void setDao(BookDAO dao);
}

我认为这个问题与Book和Book实现绑定无关，而是与servlet绑定/注册到Jersey容器有关。你可以粘贴整个堆栈跟踪，guice stacktraces是冗长的，非常有用。

用guice覆盖球衣资源

1 个答案: