private void threadSpin()
{
var lastPileCompact = DateTime.UtcNow;
log(MessageType.Info, "threadSpin()", "Entering...");
try
{
var wasActive = App.Active; //remember whether app was active during start
//this is needed so that CacheStore works without app container (using NOPApplication) in which case
//service must be .Disposed() to stop this thread
var timer = Stopwatch.StartNew();
while ((App.Active | !wasActive) && Running)
{
var utcNow = DateTime.UtcNow;
var tc = m_Tables.Count;
var maxTimePerTableMs = THREAD_MAX_TIME_FOR_SWEEP_ALL_MS / (tc != 0 ? tc : 1);
if (maxTimePerTableMs < 2)
{
maxTimePerTableMs = 2;
}
foreach (var table in m_Tables)
{
if (!Running)
{
break;
}
try
{
var sweptToEnd = table.Sweep(timer, maxTimePerTableMs);
if (m_InstrumentationEnabled)
{
Instrumentation.CacheTableSwept.Happened(Name); //for cache
Instrumentation.CacheTableSwept.Happened(Name + "." + table.Name); //for table
}
if (sweptToEnd)
{
if (table.Count == 0)
{
if (!table.SweepWhenBecameEmpty.HasValue)
{
table.SweepWhenBecameEmpty = utcNow;
}
else
if ((utcNow - table.SweepWhenBecameEmpty.Value).TotalSeconds > EMPTY_TABLE_LIFE_SEC)
{
m_Tables.Unregister(table);//can mutate m_Tables because foreach does a snapshot via GetEnumerator
}
}
else
{
table.SweepWhenBecameEmpty = null;
}
}
}
catch (Exception error)
{
log(MessageType.Critical,
"threadSpin().foreach.Sweep",
"Leaked exception while sweeping table '{0}': {1}'"
.Args(table.Name, error.ToMessageWithType()), error);
}
}
try
{
dumpInstruments();
}
catch (Exception error)
{
log(MessageType.Critical,
"threadSpin().dumpInstruments",
"Leaked exception dumping instrumentation: {0}'"
.Args(error.ToMessageWithType()), error);
}
try
{
if ((utcNow - lastPileCompact).TotalSeconds > 5 * 60)
{
var freed = m_Pile.Compact();
lastPileCompact = utcNow;
if (freed > 0)
{
log(MessageType.Info, "threadSpin().pile.compact()", "Freed {0:n0} bytes".Args(freed));
}
}
}
catch (Exception error)
{
log(MessageType.Critical,
"threadSpin().pile.compact()",
"Leaked exception compacting pile: {0}'"
.Args(error.ToMessageWithType()), error);
}
m_Trigger.WaitOne(THREAD_MIN_GRANULARITY_MS + ExternalRandomGenerator.Instance.NextScaledRandomInteger(0, THREAD_GRANULARITY_VARIANCE_MS));
} //while
}
catch (Exception e)
{
log(MessageType.Emergency, "threadSpin()", "Leaked exception, the tables are not swept anymore" + e.ToMessageWithType(), e);
}
log(MessageType.Info, "threadSpin()", "...Exiting");
}
