private void GetMetricValue()
{
if (DateTime.Now.Subtract(lastPoll).TotalSeconds > _pollingIntervalInSeconds)
{
_lastDelay = 0;
var lastCommitDoc = _commitsCollection.FindAll()
.SetSortOrder(SortBy.Descending("_id"))
.SetFields(Fields.Include("_id"))
.FirstOrDefault();
if (lastCommitDoc == null)
{
return;
}
var lastCommit = lastCommitDoc["_id"].AsInt64;
//db.checkpoints.aggregate(
//[
// {$match : {"Active": true}}
// ,{$project : {"Slot" : 1, "Current" : 1}}
// ,{$group : {"_id" : "$Slot", "Current" : {$min : "$Current"}}}
//])
BsonDocument[] pipeline =
{
BsonDocument.Parse(@"{$match : {""Active"": true}}"),
BsonDocument.Parse(@"{$project : {""Slot"" : 1, ""Current"" : 1}}"),
BsonDocument.Parse(@"{$group : {""_id"" : ""$Slot"", ""Current"" : {$min : ""$Current""}}}")
};
AggregateArgs args = new AggregateArgs();
args.Pipeline = pipeline;
args.AllowDiskUse = true; //important for large file systems
var allCheckpoints = _checkpointCollection.Aggregate(args);
foreach (BsonDocument metric in allCheckpoints)
{
var slotName = metric["_id"].AsString;
Int64 current;
if (!metric["Current"].IsBsonNull)
{
current = Int64.Parse(metric["Current"].AsString);
}
else
{
current = 0;
}
var delay = lastCommit - current;
if (delay > _lastDelay)
{
_lastDelay = delay;
}
_lastMetrics[slotName] = new SlotStatus(slotName, delay);
}
lastPoll = DateTime.Now;
}
}
static SlotStatus()
{
Null = new SlotStatus("", 0);
}
private void GetMetricValue()
{
try
{
if (Interlocked.CompareExchange(ref _isRetrievingData, 1, 0) == 0 &&
DateTime.Now.Subtract(lastPoll).TotalSeconds > _pollingIntervalInSeconds)
{
if (_eventStoreDatabase.Client.Cluster.Description.State != ClusterState.Connected ||
_readModelDatabase.Client.Cluster.Description.State != ClusterState.Connected)
{
//database is down, we cannot read values.
lastPoll = DateTime.Now;
return;
}
_lastDelay = 0;
var lastCommitDoc = _commitsCollection
.FindAll()
.Sort(Builders <BsonDocument> .Sort.Descending("_id"))
.Project(Builders <BsonDocument> .Projection.Include("_id"))
.FirstOrDefault();
if (lastCommitDoc == null)
{
return;
}
var lastCommit = lastCommitDoc["_id"].AsInt64;
BsonDocument[] pipeline =
{
BsonDocument.Parse(@"{""Active"": true}"),
BsonDocument.Parse(@"{""Slot"" : 1, ""Current"" : 1}"),
BsonDocument.Parse(@"{""_id"" : ""$Slot"", ""Current"" : {$min : ""$Current""}}")
};
var options = new AggregateOptions();
options.AllowDiskUse = true;
options.UseCursor = true;
var allCheckpoints = _checkpointCollection.Aggregate(options)
.Match(pipeline[0])
.Project(pipeline[1])
.Group(pipeline[2])
.ToList();
foreach (BsonDocument metric in allCheckpoints)
{
var slotName = metric["_id"].AsString;
Int64 current;
if (!metric["Current"].IsBsonNull)
{
current = metric["Current"].AsInt64;
}
else
{
current = 0;
}
var delay = lastCommit - current;
if (delay > _lastDelay)
{
_lastDelay = delay;
}
_lastMetrics[slotName] = new SlotStatus(slotName, delay);
}
lastPoll = DateTime.Now;
}
}
finally
{
Interlocked.Exchange(ref _isRetrievingData, 0);
}
}
private void UpdateSlot(long lastCommit, string slotName, long current)
{
var delay = lastCommit - current;
_lastMetrics[slotName] = new SlotStatus(slotName, delay);
}