使用Restlet,我可以在哪里预先加载某些内容,以便每次访问资源时都不会处理它?

时间:2011-11-29 20:01:55

标签: java web-services restlet

我想使用Restlet处理某些信息的请求,但是这些信息需要一些时间才能从磁盘加载,所以我想在启动Restlet服务器时执行此步骤,而不是在我的Resource类中执行此步骤,在每个请求上实例化。换句话说,我想将它加载到内存中一次。

我正在查看本教程:http://www.2048bits.com/2008/06/creating-simple-web-service-with.html并假设每次有人请求/用户时,router.attach("/users", UserResource.class);都会实例化一个新的UserResource()对象。假设我想将用户数据库加载到内存中,以便UserResource.findUser()中的查找速度很快。

更新:也许像这样的回答可以帮到我吗? https://stackoverflow.com/a/7865506/318870

更新2:我认为我找到了一个解决方案,所以很快就会发布我的调查结果

1 个答案:

答案 0 :(得分:1)

从Restlet一书和their public source code,他们只使用getApplication()课程中的Resource函数:

public class Application extends org.restlet.Application {

    public static void main(String... args) throws Exception {
        // Create a component with an HTTP server connector
        final Component comp = new Component();
        comp.getServers().add(Protocol.HTTP, 3000);

        // Attach the application to the default host and start it
        comp.getDefaultHost().attach("/v1", new Application());
        comp.start();
    }

    private final ObjectContainer container;

    /**
     * Constructor.
     */
    public Application() {
        /** Open and keep the db4o object container. */
        EmbeddedConfiguration config = Db4oEmbedded.newConfiguration();
        config.common().updateDepth(2);
        this.container = Db4oEmbedded.openFile(config, System
                .getProperty("user.home")
                + File.separator + "restbook.dbo");
    }

    @Override
    public Restlet createInboundRoot() {
        final Router router = new Router(getContext());

        // Add a route for user resources
        router.attach("/users/{username}", UserResource.class);

        // Add a route for user's bookmarks resources
        router.attach("/users/{username}/bookmarks", BookmarksResource.class);

        // Add a route for bookmark resources
        final TemplateRoute uriRoute = router.attach(
                "/users/{username}/bookmarks/{URI}", BookmarkResource.class);
        uriRoute.getTemplate().getVariables().put("URI",
                new Variable(Variable.TYPE_URI_ALL));

        return router;
    }

    /**
     * Returns the database container.
     * 
     * @return the database container.
     */
    public ObjectContainer getContainer() {
        return this.container;
    }
}


/** resource class (UserResource.java) has these functions
/**
 * Returns the parent application.
 * 
 * @return the parent application.
 */
@Override
public Application getApplication() {
    return (Application) super.getApplication();
}

/**
 * Returns the database container.
 * 
 * @return the database container.
 */
public ObjectContainer getContainer() {
    return getApplication().getContainer();
}