/// <summary>
/// Creates instances of MBeanClient objects for all open JMX ports on a host within a given port range.
/// This is accomplished by scanning the range starting from the bottom and stopping when a closed port is encountered, to maintain parity with how Tableau exposes JMX ports.
/// </summary>
/// <param name="hostname">The hostname of the remote host to generate clients for.</param>
/// <param name="startPort">The start of the port range to scan.</param>
/// <param name="endPort">The end of the port range to scan.</param>
/// <returns>Collection of MBeanClients for open ports within the given range.</returns>
public static ICollection<IMBeanClient> CreateClients(string hostname, int startPort, int endPort)
{
// Validate port range.
if (!IsValidPortRange(startPort, endPort))
{
throw new ArgumentException("Invalid port range");
}
Log.Debug(String.Format("Scanning JMX ports {0}-{1} on {2}..", startPort, endPort, hostname));
ICollection<IMBeanClient> validClients = new List<IMBeanClient>();
for (var currentPort = startPort; currentPort <= endPort; currentPort++)
{
var connectionInfo = new JmxConnectionInfo(hostname, currentPort);
var connector = new JmxConnectorProxy(connectionInfo);
try
{
connector.OpenConnection();
IMBeanClient client = new MBeanClient(connector);
validClients.Add(client);
Log.Debug(String.Format("Created JMX client for {0}", connectionInfo));
}
catch (Exception)
{
Log.Debug(String.Format("Encountered closed JMX port ({0}), stopping scan.", currentPort));
break;
}
}
return validClients;
}
/// <summary>
/// Creates instances of MBeanClient objects for all open JMX ports on a host within a given port range.
/// This is accomplished by scanning the range starting from the bottom and stopping when a closed port is encountered, to maintain parity with how Tableau exposes JMX ports.
/// </summary>
/// <param name="hostname">The hostname of the remote host to generate clients for.</param>
/// <param name="startPort">The start of the port range to scan.</param>
/// <param name="endPort">The end of the port range to scan.</param>
/// <returns>Collection of MBeanClients for open ports within the given range.</returns>
public static ICollection <IMBeanClient> CreateClients(string hostname, int startPort, int endPort)
{
// Validate port range.
if (!IsValidPortRange(startPort, endPort))
{
throw new ArgumentException("Invalid port range");
}
Log.Debug(String.Format("Scanning JMX ports {0}-{1} on {2}..", startPort, endPort, hostname));
ICollection <IMBeanClient> validClients = new List <IMBeanClient>();
for (var currentPort = startPort; currentPort <= endPort; currentPort++)
{
var connectionInfo = new JmxConnectionInfo(hostname, currentPort);
var connector = new JmxConnectorProxy(connectionInfo);
try
{
connector.OpenConnection();
IMBeanClient client = new MBeanClient(connector);
validClients.Add(client);
Log.Debug(String.Format("Created JMX client for {0}", connectionInfo));
}
catch (Exception)
{
Log.Debug(String.Format("Encountered closed JMX port ({0}), stopping scan.", currentPort));
break;
}
}
return(validClients);
}
protected override object GetAttributeValue(string attribute)
{
// Find MBean object.
var objectNames = MBeanClient.QueryObjects(JmxDomain, Path);
// Validated MBean object was found.
if (objectNames.Count == 0)
{
throw new ArgumentException("Unable to query MBean.");
}
object result;
var obj = objectNames[0];
// The Java Health counters may be nested as CompositeData objects, so we need to be prepared to handle this.
if (attribute.Contains(@"\"))
{
var pathSegments = attribute.Split('\\');
var parent = pathSegments[0];
var child = pathSegments[1];
var compositeData = MBeanClient.GetAttributeValue(obj, parent) as CompositeData;
result = compositeData.get(child);
}
else
{
result = MBeanClient.GetAttributeValue(obj, attribute);
}
// Wonky parsing to convert result from Java lang object into C# float.
return(float.Parse(result.ToString()));
}
protected override object GetAttributeValue(string attribute)
{
// Find MBean object.
ICollection <ObjectName> objectNames = MBeanClient.QueryObjects(JmxDomain, Path);
// Validated MBean object was found.
if (objectNames.Count == 0)
{
throw new ArgumentException("Unable to query MBean.");
}
ObjectName obj = objectNames.First();
object result = MBeanClient.GetAttributeValue(obj, attribute);
// Wonky parsing to convert result from Java lang object into C# float.
return(float.Parse(result.ToString()));
}
protected override object GetAttributeValue(string attribute)
{
// Find MBean object.
var objectNames = MBeanClient.QueryObjects(JmxDomain, Path);
// Validated MBean object was found.
if (objectNames.Count < 1)
{
throw new ArgumentException("Unable to query MBean.");
}
// Grab associated attributes.
var attributes = MBeanClient.InvokeMethod(objectNames[0], "getPerformanceMetrics") as CompositeData;
// Look up the attribute we care about & do some wonky parsing to convert it from Java CompositeData into C# float.
var result = attributes.get(attribute).ToString();
return(float.Parse(result));
}
