如何在Jersey / Glassfish中加载和存储全局变量

问题描述

我正在创建一个包装陈旧供应商API的RESTful Web服务。一些外部配置将是必需的，并将以文件或rdbms的形式存储在服务器上。我在Glassfish 3.1.2中使用Jersey 1.11.1。

I am creating a RESTful Web Service that wraps an antiquated vendor API. Some external configuration will be required and will be stored on the server either in a file or rdbms. I'm using Jersey 1.11.1 in Glassfish 3.1.2. This configuration data is all in String key/value format.

我的第一个问题是 - 我可以在哪里存储全局变量/实例变量，以便它们在请求并可用于所有资源？如果这是一个纯粹的Servlet应用程序，我会使用ServletContext来实现这一点。

My first question is this - where can I store global/instance variables in Jersey so that they will be persisted between requests and available to all resources? If this was a pure Servlet application I would use the ServletContext to accomplish this.

问题的第二部分是如何在Jersey服务器加载后加载配置？同样，我的Servlet的比喻是找到与init（）方法等价的东西。

The second part to the question is how can I load my configuration once the Jersey server has loaded? Again, my Servlet analogy would be to find the equivalent to the init() method.

推荐答案

Singleton @Startup EJB符合您的要求。

@Singleton @Startup EJB matches your requirements.

@Singleton
@Startup // initialize at deployment time instead of first invocation
public class VendorConfiguration {

    @PostConstruct
    void loadConfiguration() {
        // do the startup initialization here
    }

    @Lock(LockType.READ) // To allow multiple threads to invoke this method
                         // simultaneusly
    public String getValue(String key) {
    }
}


@Path('/resource')
@Stateless
public class TheResource {
    @EJB
    VendorConfiguration configuration;
    // ...
}

编辑： em>根据Graham的评论添加注释

Added annotation as per Graham's comment

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