我正在寻找一种方法来覆盖在 GuiceServletContextListener 中与 guice 绑定(bind)的 Jersey 资源。我正在尝试运行的代码:
//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,这行不通,虽然我不能像实现接口(interface)那样在 guice 中绑定(bind) Jersey 资源,只有 bind(BookImpl.class)
可以工作。但是这样的绑定(bind)是不可能被覆盖的。如果我尝试使用 bind(BookUserImpl.class)
覆盖 bind(BookImpl.class)
,我会收到错误消息 Conflicting URI templates。根资源类的 URI 模板/books/{key}。
而 @Path 应该是唯一的。那么我的用例有什么解决方案吗?
最佳答案
我只是想警告您 Modules.override 对 Guice.createInjector(Stage.PRODUCTION,...) 不起作用,因此您应该仅在开发时谨慎使用它。您应该创建两个上下文监听器并以某种方式(可以说是通过 maven 配置文件)设置 web.xml 并正确实现。
更好用:
//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());
}
}
您可以在您的界面上使用@ImplementedBy 注释来说明默认实现应该是什么。因此,您不必显式绑定(bind)它,如果您绑定(bind)它,它将覆盖注释绑定(bind)。
@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(bind)无关,而是与将 servlet 绑定(bind)/注册到 Jersey 容器有关。你能粘贴整个堆栈跟踪吗,guice 堆栈跟踪很冗长但很有帮助。
关于java - 用 guice 覆盖 Jersey 资源,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13752061/