/// <summary>
/// Reads the names of classes specified in the
/// "hadoop.htrace.spanreceiver.classes" property and instantiates and registers
/// them with the Tracer as SpanReceiver's.
/// </summary>
/// <remarks>
/// Reads the names of classes specified in the
/// "hadoop.htrace.spanreceiver.classes" property and instantiates and registers
/// them with the Tracer as SpanReceiver's.
/// The nullary constructor is called during construction, but if the classes
/// specified implement the Configurable interface, setConfiguration() will be
/// called on them. This allows SpanReceivers to use values from the Hadoop
/// configuration.
/// </remarks>
public virtual void LoadSpanReceivers(Configuration conf)
{
lock (this)
{
config = new Configuration(conf);
string receiverKey = confPrefix + SpanReceiversConfSuffix;
string[] receiverNames = config.GetTrimmedStrings(receiverKey);
if (receiverNames == null || receiverNames.Length == 0)
{
if (Log.IsTraceEnabled())
{
Log.Trace("No span receiver names found in " + receiverKey + ".");
}
return;
}
// It's convenient to have each daemon log to a random trace file when
// testing.
string pathKey = confPrefix + LocalFileSpanReceiverPathSuffix;
if (config.Get(pathKey) == null)
{
string uniqueFile = GetUniqueLocalTraceFileName();
config.Set(pathKey, uniqueFile);
if (Log.IsTraceEnabled())
{
Log.Trace("Set " + pathKey + " to " + uniqueFile);
}
}
foreach (string className in receiverNames)
{
try
{
SpanReceiver rcvr = LoadInstance(className, Empty);
Trace.AddReceiver(rcvr);
receivers[highestId++] = rcvr;
Log.Info("Loaded SpanReceiver " + className + " successfully.");
}
catch (IOException e)
{
Log.Error("Failed to load SpanReceiver", e);
}
}
}
}
/// <exception cref="System.IO.IOException"/>
public override long AddSpanReceiver(SpanReceiverInfo info)
{
lock (this)
{
StringBuilder configStringBuilder = new StringBuilder();
string prefix = string.Empty;
foreach (SpanReceiverInfo.ConfigurationPair pair in info.configPairs)
{
configStringBuilder.Append(prefix).Append(pair.GetKey()).Append(" = ").Append(pair
.GetValue());
prefix = ", ";
}
SpanReceiver rcvr = null;
try
{
rcvr = LoadInstance(info.GetClassName(), info.configPairs);
}
catch (IOException e)
{
Log.Info("Failed to add SpanReceiver " + info.GetClassName() + " with configuration "
+ configStringBuilder.ToString(), e);
throw;
}
catch (RuntimeException e)
{
Log.Info("Failed to add SpanReceiver " + info.GetClassName() + " with configuration "
+ configStringBuilder.ToString(), e);
throw;
}
Trace.AddReceiver(rcvr);
long newId = highestId++;
receivers[newId] = rcvr;
Log.Info("Successfully added SpanReceiver " + info.GetClassName() + " with configuration "
+ configStringBuilder.ToString());
return(newId);
}
}