public void MarkAlive(DateTime timestamp)
{
var newReading = new RecordedHeartbeat(HeartbeatStatus.Alive, timestamp);
var done = false;
while (!done)
{
var priorReading = heartbeat;
if (priorReading.Timestamp.GetValueOrDefault() <= timestamp)
{
done = Interlocked.CompareExchange(ref heartbeat, newReading, priorReading) == priorReading;
}
else
{
done = true;
}
}
}
public RecordedHeartbeat MarkDeadIfOlderThan(DateTime cutoff)
{
var done = false;
while (!done)
{
var priorReading = heartbeat;
if (priorReading.Timestamp.GetValueOrDefault() < cutoff)
{
var newReading = new RecordedHeartbeat(HeartbeatStatus.Dead, priorReading.Timestamp);
done = Interlocked.CompareExchange(ref heartbeat, newReading, priorReading) == priorReading;
}
else
{
done = true;
}
}
return(heartbeat);
}
