什么对应泽西2中HK2的asEagerSingleton？

Question

我正在使用Jersey 2开发REST API,我需要在启动时实例化一些类,而不仅仅是在某些资源请求触发它时.

所以我要问的是:我如何实现SomethingImpl下面定义的实例是在服务器启动时创建的,而不仅仅是当有人点击某些资源时？在Guice我会用.asEagerSingleton().

应用:

public class MyApplication extends ResourceConfig {
    public MyApplication() {
        register(new AbstractBinder() {
            @Override
            protected void configure() {
                bind(" else").to(String.class);
                bind(SomethingImpl.class).to(Something.class).in(Singleton.class);
            }
        });

        register(SomeResource.class);
    }
}

东西:

public interface Something {
   String something();
}

public class SomethingImpl implements Something {
    @Inject
    public SomethingImpl(final String something) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                while (true) {
                    System.out.println(something() + something);

                    try {
                        Thread.sleep(4000);

                    } catch (final InterruptedException e) {
                        break;
                    }
                }
            }
        }).start();
    }

    @Override
    public String something() {
        return "Something";
    }
}

一些资源:

@Path("/")
public class SomeResource {
    private final Something something;

    @Inject
    public SomeResource(final Something something) {
        this.something = something;
    }

    @GET
    @Path("something")
    public String something() {
        return something.something();
    }
}

Answer 1

在hk2的后续版本中,与Jersey集成(但很快将集成),您可以获得标记为@Immediate的服务.这些基本上都会在添加到hk2后立即开始.但是,为了使其工作,您必须将Immediate上下文添加到系统中(例如https://hk2.java.net/2.2.0-b27/apidocs/org/glassfish/hk2/utilities/ServiceLocatorUtilities.html #enableImmediateScope%28org.glassfish.hk2.api.ServiceLocator%29)

与Jersey团队一起游说默认启用此范围/上下文对(他们已经启用PerThread范围之类的东西)是个好主意

我创建了这个问题:https://java.net/jira/browse/JERSEY-2291请求泽西岛默认启用@Immediate服务