java – 从JNDI custom-resource检索其他属性

2019年8月4日 158次阅读

我在Glassfish服务器上配置了这个JNDI自定义资源：

我也部署了一个Web应用程序,在某些时候,我想获得为我的自定义资源的“版本”附加属性配置的值.

我的工厂类是这样的：

public class TestCRFactory implements ObjectFactory {

    @Override
    public Object getObjectInstance(Object obj, Name name, Context nameCtx, Hashtable<?, ?> environment) {
        if (obj instanceof Reference) {
            Reference ref = (Reference) obj;
            Enumeration<RefAddr> addrs = ref.getAll();
            while (addrs.hasMoreElements()) {
                RefAddr addr = addrs.nextElement();
                if (addr.getType().equals("version")) {
                    String version = (String) addr.getContent();
                    System.out.println(version); // it shows me "1"
                }
            }
        }
    }
}

如果我查找对象：

Context context = new InitialContext();
Object obj = context.lookup("test/TestCR");

我的代码工作正常,我可以在工厂类中获得“版本”属性没有问题.

但是现在我想获得“version”属性而不查找对象并调用工厂类.我只想通过MBeanServer做类似的事情：

import javax.management.MBeanServer;
import java.lang.management.ManagementFactory;
import javax.management.ObjectName;

...
boolean existsObject = false;
String name = "amx:pp=/domain/resources,type=custom-resource,name=test/TestCR";
ObjectName objName = new ObjectName(name);
try {
    MBeanServer mbean = ManagementFactory.getPlatformMBeanServer();
    existsObject = mbean.getObjectInstance(objName) != null; // this line works
    if (existsObject) {
       Object attr = mbean.getAttribute(objName, "version"); // this line doesn't work. it doesn't give me the "version" property I want.
    }
} catch (Throwable e) {
    existsObject = false;
}

我的问题是：我做错了什么？我应该将属性名称放在name变量的末尾吗？或类似的东西？

最佳答案 我知道了！

只需使用这样的getAttribute方法：

getAttribute("amx:pp=/domain/resources/custom-resource[test/TestCR],type=property,name=version", "Value");

所以我的最终代码是：

boolean existsObject = false;
ObjectName objName = new ObjectName("amx:pp=/domain/resources,type=custom-resource,name=test/TestCR");
try {
    MBeanServer mbean = ManagementFactory.getPlatformMBeanServer();
    existsObject = mbean.getObjectInstance(objName) != null;
    if (existsObject) {
       Object attr = mbean.getAttribute("amx:pp=/domain/resources/custom-resource[test/TestCR],type=property,name=version", "Value");
       // here 'attr' var is indicating '1', as I've set! (I tested with other values too) 
    }
} catch (Throwable e) {
    existsObject = false;
}
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