static InstanceNameTruncOptions GetCompressionTasks(int totalLen, int serviceLen, int uriLen)
{
InstanceNameTruncOptions bitmask = 0;
if (totalLen > maxCounterLength)
{
int workingLen = totalLen;
//note: order of if statements important (see spec)!
if (workingLen > maxCounterLength && serviceLen > 32)
{
bitmask |= InstanceNameTruncOptions.Service32; //compress service name to 16 chars
workingLen -= serviceLen - 32;
}
if (workingLen > maxCounterLength && uriLen > 31)
{
bitmask |= InstanceNameTruncOptions.Uri31; //compress uri to 31 chars
}
}
return(bitmask);
}
static internal string CreateFriendlyInstanceName(ServiceHostBase serviceHost)
{
// instance name is: serviceName@uri
ServiceInfo serviceInfo = new ServiceInfo(serviceHost);
string serviceName = serviceInfo.ServiceName;
string uri;
if (!TryGetFullVirtualPath(serviceHost, out uri))
{
uri = serviceInfo.FirstAddress;
}
int length = serviceName.Length + uri.Length + 2;
if (length > maxCounterLength)
{
int count = 0;
InstanceNameTruncOptions tasks = GetCompressionTasks(
length, serviceName.Length, uri.Length);
//if necessary, compress service name to 8 chars with a 2 char hash code
if ((tasks & InstanceNameTruncOptions.Service32) > 0)
{
count = 32;
serviceName = GetHashedString(serviceName, count - hashLength, serviceName.Length - count + hashLength, true);
}
//if necessary, compress uri to 36 chars with a 2 char hash code
if ((tasks & InstanceNameTruncOptions.Uri31) > 0)
{
count = 31;
uri = GetHashedString(uri, 0, uri.Length - count + hashLength, false);
}
}
// replace '/' with '|' because perfmon fails when '/' is in perfcounter instance name
return(serviceName + "@" + uri.Replace('/', '|'));
}
