JmxInfoProviderSupport.java 文件源码

@Override
public long[] getFileDecriptorInfo() {
    MBeanServer mbsc = MBeans.getMBeanServer();
    AttributeList attributes;
    try {
        attributes = mbsc.getAttributes(
            new ObjectName("java.lang:type=OperatingSystem"), 
            new String[]{"OpenFileDescriptorCount", "MaxFileDescriptorCount"});
        List<Attribute> attrList = attributes.asList();
        long openFdCount = (Long)attrList.get(0).getValue();
        long maxFdCount = (Long)attrList.get(1).getValue();
        long[] fdCounts = { openFdCount, maxFdCount};
        return fdCounts;
    } catch (Exception e) {
        LogFactory.getLog(SdkMBeanRegistrySupport.class).debug(
                "Failed to retrieve file descriptor info", e);
    }
    return null;
}