public override void Run()
{
try
{
MBeanServer mbs = ManagementFactory.GetPlatformMBeanServer();
// Metrics that belong to "FSNamesystem", these are metrics that
// come from hadoop metrics framework for the class FSNamesystem.
ObjectName mxbeanNamefsn = new ObjectName("Hadoop:service=NameNode,name=FSNamesystem"
);
// Metrics that belong to "FSNamesystemState".
// These are metrics that FSNamesystem registers directly with MBeanServer.
ObjectName mxbeanNameFsns = new ObjectName("Hadoop:service=NameNode,name=FSNamesystemState"
);
// Metrics that belong to "NameNodeInfo".
// These are metrics that FSNamesystem registers directly with MBeanServer.
ObjectName mxbeanNameNni = new ObjectName("Hadoop:service=NameNode,name=NameNodeInfo"
);
ICollection <ObjectName> mbeans = new HashSet <ObjectName>();
mbeans.AddItem(mxbeanNamefsn);
mbeans.AddItem(mxbeanNameFsns);
mbeans.AddItem(mxbeanNameNni);
foreach (ObjectName mbean in mbeans)
{
MBeanInfo attributes = mbs.GetMBeanInfo(mbean);
foreach (MBeanAttributeInfo attributeInfo in attributes.GetAttributes())
{
mbs.GetAttribute(mbean, attributeInfo.GetName());
}
}
succeeded = true;
}
catch (Exception)
{
}
}
// --------------------------------------------------------- Private Methods
/// <exception cref="System.IO.IOException"/>
private void ListBeans(JsonGenerator jg, ObjectName qry, string attribute, HttpServletResponse
response)
{
Log.Debug("Listing beans for " + qry);
ICollection <ObjectName> names = null;
names = mBeanServer.QueryNames(qry, null);
jg.WriteArrayFieldStart("beans");
IEnumerator <ObjectName> it = names.GetEnumerator();
while (it.HasNext())
{
ObjectName oname = it.Next();
MBeanInfo minfo;
string code = string.Empty;
object attributeinfo = null;
try
{
minfo = mBeanServer.GetMBeanInfo(oname);
code = minfo.GetClassName();
string prs = string.Empty;
try
{
if ("org.apache.commons.modeler.BaseModelMBean".Equals(code))
{
prs = "modelerType";
code = (string)mBeanServer.GetAttribute(oname, prs);
}
if (attribute != null)
{
prs = attribute;
attributeinfo = mBeanServer.GetAttribute(oname, prs);
}
}
catch (AttributeNotFoundException e)
{
// If the modelerType attribute was not found, the class name is used
// instead.
Log.Error("getting attribute " + prs + " of " + oname + " threw an exception", e);
}
catch (MBeanException e)
{
// The code inside the attribute getter threw an exception so log it,
// and fall back on the class name
Log.Error("getting attribute " + prs + " of " + oname + " threw an exception", e);
}
catch (RuntimeException e)
{
// For some reason even with an MBeanException available to them
// Runtime exceptionscan still find their way through, so treat them
// the same as MBeanException
Log.Error("getting attribute " + prs + " of " + oname + " threw an exception", e);
}
catch (ReflectionException e)
{
// This happens when the code inside the JMX bean (setter?? from the
// java docs) threw an exception, so log it and fall back on the
// class name
Log.Error("getting attribute " + prs + " of " + oname + " threw an exception", e);
}
}
catch (InstanceNotFoundException)
{
//Ignored for some reason the bean was not found so don't output it
continue;
}
catch (IntrospectionException e)
{
// This is an internal error, something odd happened with reflection so
// log it and don't output the bean.
Log.Error("Problem while trying to process JMX query: " + qry + " with MBean " +
oname, e);
continue;
}
catch (ReflectionException e)
{
// This happens when the code inside the JMX bean threw an exception, so
// log it and don't output the bean.
Log.Error("Problem while trying to process JMX query: " + qry + " with MBean " +
oname, e);
continue;
}
jg.WriteStartObject();
jg.WriteStringField("name", oname.ToString());
jg.WriteStringField("modelerType", code);
if ((attribute != null) && (attributeinfo == null))
{
jg.WriteStringField("result", "ERROR");
jg.WriteStringField("message", "No attribute with name " + attribute + " was found."
);
jg.WriteEndObject();
jg.WriteEndArray();
jg.Close();
response.SetStatus(HttpServletResponse.ScNotFound);
return;
}
if (attribute != null)
{
WriteAttribute(jg, attribute, attributeinfo);
}
else
{
MBeanAttributeInfo[] attrs = minfo.GetAttributes();
for (int i = 0; i < attrs.Length; i++)
{
WriteAttribute(jg, oname, attrs[i]);
}
}
jg.WriteEndObject();
}
jg.WriteEndArray();
}