public LogFileStats GetStats(ILogFile logFile, Filter filter) => impl_.GetOrAdd(new Key(logFile, filter), k => LogFileStats.GatherStats(logFile, k.UnstatableFilter));
public static LogFileStats GatherStats(ILogFile logFile, Filter filter)
{
var events = logFile.GetEvents();
var filteredEvents = filter != null
? events.Where(filter)
: events;
var stats = filteredEvents.Aggregate
(
new
{
EventCount = 0,
GroupStats = new Dictionary <EventGroupKey, int> (),
EarliestTimestamp = Timestamp.MaxValue,
LatestTimestamp = Timestamp.MinValue
},
(a, e) =>
{
var ts = e.Timestamp;
var gs = a.GroupStats;
var groupKey = new EventGroupKey(e);
if (gs.TryGetValue(groupKey, out var groupCount))
{
gs[groupKey] = groupCount + 1;
}
else
{
gs.Add(groupKey, 1);
}
return(new
{
EventCount = a.EventCount + 1,
GroupStats = gs,
EarliestTimestamp = ts <a.EarliestTimestamp?ts : a.EarliestTimestamp,
LatestTimestamp = ts> a.LatestTimestamp ? ts : a.LatestTimestamp
});
}
);
var eventCount = stats.EventCount;
var groupStats = stats.GroupStats;
Int64 earliestTimestamp;
Int64 latestTimestamp;
if (eventCount > 0)
{
earliestTimestamp = stats.EarliestTimestamp;
latestTimestamp = stats.LatestTimestamp;
}
else
{
earliestTimestamp = Timestamp.MinValue;
latestTimestamp = Timestamp.MaxValue;
}
var result = new LogFileStats
(logFile.FileName, logFile.Size, eventCount, groupStats, earliestTimestamp, latestTimestamp);
return(result);
}