[英]Override jersey resource with guice
我正在寻找一种方法来覆盖GuiceServletContextListener中与guice绑定的球衣资源。 我正在尝试的代码:
//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());
}
}
但是不幸的是,这是行不通的,尽管我不能像实现接口那样绑定球衣资源,但只能bind(BookImpl.class)
。 但是这种绑定是不可能覆盖的。 如果我尝试使用bind(BookImpl.class)
覆盖bind(BookImpl.class)
, bind(BookUserImpl.class)
收到错误Conflicting URI templates. The URI template /books/{key} for root resource class.
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?
我只是不警告您Modules.override在Guice.createInjector(Stage.PRODUCTION,...)上不起作用,因此您应该仅将其谨慎地用于开发。 您应该创建两个上下文侦听器,并以某种方式(可以说是maven配置文件)设置具有正确实现的web.xml。
更好地使用:
//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());
}
}
您可以在界面上使用@ImplementedBy批注,以表示默认实现应为。 因此,您不必显式绑定它,而如果您绑定它,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 and Book实现绑定无关,而是与Servlet到Jersey容器的绑定/注册有关。 您能粘贴整个stacktrace吗,guice stacktrace很冗长而且很有帮助。
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