} // end of GenerateSlowSqlSingleRow function
// Generates INSERT statement for a single data row - fast changing metric
private static string GenerateSqlSingleRowFast(int targetId, MetricGroup metricGroup, ProbeResultingData data)
{
string dataSqlStmt = "INSERT INTO " + SqlServerProbe.DataTableName(targetId, metricGroup) + " (dt,";
for (int i = 0; i < metricGroup.NumberOfMetrics; i++)
{
dataSqlStmt += metricGroup.metrics[i].name.Replace(' ', '_') + ",";
}
dataSqlStmt = dataSqlStmt.Remove(dataSqlStmt.Length - 1); // remove last comma
dataSqlStmt += ")" + Environment.NewLine + "VALUES ('" + SqlServerProbe.DateTimeToString(data.probeDateTime) + "',";
if (metricGroup.NumberOfMetrics != data.NumberOfColumns)
{
throw new Exception("Number of metrics don't match number of columns in probe results");
}
// add metric values
for (int i = 0; i < metricGroup.NumberOfMetrics; i++)
{
dataSqlStmt += SqlServerProbe.DataValueToString(metricGroup.metrics[i].type, data.values[0, metricGroup.NumberOfMultiRowKeys + metricGroup.NumberOfMultiRowKeyAttributes + i]) + ",";
}
dataSqlStmt = dataSqlStmt.Remove(dataSqlStmt.Length - 1); // remove last comma
dataSqlStmt += ")";
return(dataSqlStmt);
} // end of GenerateFastSqlSingleRow function
} // end of ProcessQueue function
#endregion public methods declarations
#region private static methods declarations
/// <summary>Generates UPDATE or INSERT statement for a single data row - slow changing metric</summary>
private static string GenerateSqlSingleRowSlow(int targetId, MetricGroup metricGroup, int dataMatches, ProbeResultingData data)
{
string dataSqlStmt;
if (dataMatches == 0) // just update endDate when current data matches one stored in repository
{
dataSqlStmt = "UPDATE " + SqlServerProbe.DataTableName(targetId, metricGroup)
+ " SET endDate = '" + SqlServerProbe.DateTimeToString(data.probeDateTime) + "'"
+ " WHERE startDate = (SELECT MAX(startDate) FROM " + SqlServerProbe.DataTableName(targetId, metricGroup) + ")";
}
else
{
if (metricGroup.NumberOfMetrics != data.NumberOfColumns)
{
throw new Exception("Number of metrics doesn't match number of columns in probe results");
}
dataSqlStmt = "INSERT INTO " + SqlServerProbe.DataTableName(targetId, metricGroup) + " (";
for (int i = 0; i < metricGroup.NumberOfMetrics; i++)
{
dataSqlStmt += metricGroup.metrics[i].name.Replace(' ', '_') + ",";
}
dataSqlStmt += "startDate,endDate)"
+ Environment.NewLine + "VALUES (";
// add metric values
for (int i = 0; i < metricGroup.NumberOfMetrics; i++)
{
dataSqlStmt += SqlServerProbe.DataValueToString(metricGroup.metrics[i].type, data.values[0, metricGroup.NumberOfMultiRowKeys + metricGroup.NumberOfMultiRowKeyAttributes + i]) + ",";
}
// startDate,endDate
dataSqlStmt += "'" + SqlServerProbe.DateTimeToString(data.probeDateTime) + "','" + SqlServerProbe.DateTimeToString(data.probeDateTime) + "')";
}
return(dataSqlStmt);
} // end of GenerateSlowSqlSingleRow function
// method that runs continuously and purges data in repository
public void Work()
{
int targetId;
int timeTableId;
string sqlStmt;
MetricGroup metricGroup;
InstanceSchedule schedule;
List <Tuple <DateTime, int> > lastPurgeList;
_logger.Info("Purger started");
_reposConn = new SqlConnection(Configuration.GetReposConnectionString("Purger"));
while (!_shouldStop)
{
try
{
// this is to wait until the repository is ready to serve requests
if (!Manager.IsRepositoryAccessible)
{
Thread.Sleep(250);
continue;
}
if (this._reposConn.State != ConnectionState.Open)
{
this._reposConn.Open();
}
lastPurgeList = Configuration.timeTable.LastPurge();
foreach (Tuple <DateTime, int> lastPurge in lastPurgeList)
{
timeTableId = lastPurge.Item2;
// Skip schedules that have been deleted
if (!Configuration.timeTable.TryGetValue(timeTableId, out schedule))
{
continue;
}
// skip schedules that were purged recently
if (DateTime.Compare(lastPurge.Item1.AddMinutes(Configuration.purgeInterval), DateTime.Now) > 0)
{
continue;
}
targetId = schedule._targetId;
metricGroup = Configuration.metricGroups[schedule._metricGroupId];
// prepare SQL statement
switch (metricGroup.changeSpeed)
{
case ChangeSpeed.Slow:
sqlStmt = "DELETE FROM " + SqlServerProbe.DataTableName(targetId, metricGroup)
+ " WHERE endDate <= '" + SqlServerProbe.DateTimeToString(DateTime.Now.AddHours(-1 * schedule._schedule.retention)) + "'";
break;
case ChangeSpeed.Fast:
sqlStmt = "DELETE FROM " + SqlServerProbe.DataTableName(targetId, metricGroup)
+ " WHERE dt <= '" + SqlServerProbe.DateTimeToString(DateTime.Now.AddHours(-1 * schedule._schedule.retention)) + "'";
break;
default:
throw new Exception("Unsupported change speed");
}
// execute SQL statement
try
{
if (!Manager.IsRepositoryAccessible)
{
Thread.Sleep(250);
break;
}
if (_reposConn.State != ConnectionState.Open)
{
_reposConn.Open();
}
using (SqlCommand cmd = _reposConn.CreateCommand())
{
cmd.CommandType = CommandType.Text;
cmd.CommandText = sqlStmt;
cmd.CommandTimeout = 300;
int rowCount = cmd.ExecuteNonQuery();
_logger.Debug("Rows deleted from table " + SqlServerProbe.DataTableName(targetId, metricGroup) + ": " + rowCount.ToString());
}
// update last purge time
Configuration.timeTable.SetLastPurge(lastPurge.Item2, DateTime.Now);
}
catch (SqlException e)
{
if (e.Number == 208)
{
_logger.Debug("Table " + SqlServerProbe.DataTableName(targetId, metricGroup) + " does not exist");
}
else if (this._reposConn.State != ConnectionState.Open)
{
Manager.SetRepositoryAccessibility(false);
}
else
{
_logger.Error("Could not purge " + SqlServerProbe.DataTableName(targetId, metricGroup) + " due to error: " + e.Message);
}
}
catch (Exception e)
{
if (this._reposConn.State == ConnectionState.Open)
{
_logger.Error("Could not purge " + SqlServerProbe.DataTableName(targetId, metricGroup) + " due to error: " + e.Message);
}
else
{
Manager.SetRepositoryAccessibility(false);
}
continue;
}
Thread.Sleep(250); // we don't want to stress the repository too much
} // foreach
Thread.Sleep(250);
}
catch (Exception e)
{
if (this._reposConn != null)
{
switch (this._reposConn.State)
{
case System.Data.ConnectionState.Broken:
case System.Data.ConnectionState.Closed:
Manager.SetRepositoryAccessibility(false);
break;
default:
_logger.Error(e.Message);
_logger.Error(e.StackTrace);
_mgr.ReportFailure("Purger");
return;
}
}
else
{
_logger.Error(e.Message);
_logger.Error(e.StackTrace);
_mgr.ReportFailure("Purger");
return;
}
} // end of catch
} // end of while (!_shouldStop)
_logger.Info("Purger stopped");
}
} // end of WriteFastSingleRowToRepository function
/// <summary>Saves data into dictionary and data table for multi-value metrics</summary>
private void WriteMultipleRowsToRepository(int targetId, MetricGroup metricGroup, ProbeResultingData data)
{
int id;
CacheTable dictCache, dataCache;
List <int> newDictRows;
List <Tuple <int, int> > oldDictRows;
object[] key, attributes;
string dataTableName, dictTableName;
byte tryCount = 0;
bool canExit = false;
SqlTransaction tran = null;
string dictSqlStmt = string.Empty;
string dataSqlStmt = string.Empty;
newDictRows = new List <int>(); // ids of records that should be added to the dictionary (new rows or rows with updated attributes)
oldDictRows = new List <Tuple <int, int> >(); // ids and dictionary ids of records that changed since last probe and need to be closed
dataTableName = SqlServerProbe.DataTableName(targetId, metricGroup);
_logger.Debug("Name of data table: " + dataTableName);
dictTableName = SqlServerProbe.DictTableName(targetId, metricGroup);
_logger.Debug("Name of dictionary: " + dictTableName);
// load the dictionary cache table if it doesn't exist
if (!InMemoryCache.ContainsKey(dictTableName))
{
InMemoryCache.LoadDictionaryIntoCache(targetId, metricGroup, false);
}
dictCache = Configuration.inMemoryCache[dictTableName];
// load the dictionary cache table if it doesn't exist
if (!InMemoryCache.ContainsKey(dataTableName))
{
InMemoryCache.LoadDataIntoCache(targetId, metricGroup, false);
}
/*
* Checks for changed or new records in dictionary and if needed prepares SQL statement to update dictionary table
*/
switch (metricGroup.multiRowKeyAttributesChangeSpeed)
{
case ChangeSpeed.Static:
// check whether all records are in the dictionary or some need to be added to it
for (int i = 0; i < data.NumberOfRows; i++)
{
key = new object[metricGroup.NumberOfMultiRowKeys];
for (int j = 0; j < metricGroup.NumberOfMultiRowKeys; j++)
{
key[j] = data.values[i, j];
}
if (dictCache.GetIdByKey(key) == -1)
{
newDictRows.Add(i);
}
}
// generate SQL statements if there are any new dictionary records
if (newDictRows.Count > 0)
{
dictSqlStmt = GenerateSqlStaticDict(targetId, metricGroup, data, newDictRows);
}
break;
case ChangeSpeed.Slow:
// check whether all records are in the dictionary or some need to be added to it
for (int i = 0; i < data.NumberOfRows; i++)
{
key = new object[metricGroup.NumberOfMultiRowKeys];
for (int j = 0; j < metricGroup.NumberOfMultiRowKeys; j++)
{
key[j] = data.values[i, j];
}
id = dictCache.GetIdByKey(key);
if (id == -1)
{
newDictRows.Add(i);
}
else // check that attributes match
{
attributes = new object[metricGroup.NumberOfMultiRowKeyAttributes];
for (int j = 0; j < metricGroup.NumberOfMultiRowKeyAttributes; j++)
{
attributes[j] = data.values[i, metricGroup.NumberOfMultiRowKeys + j];
}
if (!dictCache.CompareAttributesForKey(id, attributes))
{
oldDictRows.Add(new Tuple <int, int>(i, id)); // this is to close the old record - UPDATE
}
}
}
// generate SQL statements if there are any changes or new records in dictionary
if (oldDictRows.Count > 0 || newDictRows.Count > 0)
{
dictSqlStmt = GenerateSqlSlowDict(targetId, metricGroup, data, oldDictRows, newDictRows);
}
break;
default:
throw new Exception("Unknown dictionary change speed");
}
/*
* Write new data into dictionary but don't close transaction yet
*/
if (dictSqlStmt.CompareTo(string.Empty) != 0)
{
_logger.Trace(dictSqlStmt);
// If tables don't exist, will try to create them and rerun SQL statements
while (!canExit && tryCount < 2)
{
try
{
// we will write to the dictionary first and then to the data table so we need to begin a transaction
tran = this.reposConn.BeginTransaction();
if (dictSqlStmt.CompareTo(string.Empty) != 0)
{
// save dictionary changes
using (SqlCommand cmd = this.reposConn.CreateCommand())
{
cmd.Transaction = tran;
cmd.CommandType = System.Data.CommandType.Text;
cmd.CommandText = dictSqlStmt;
int rowCount = cmd.ExecuteNonQuery();
_logger.Debug("Rows affected: " + rowCount.ToString());
}
}
InMemoryCache.LoadDictionaryIntoCache(targetId, metricGroup, true, this.reposConn, tran);
canExit = true;
}
catch (SqlException e)
{
if (tran != null)
{
tran.Rollback();
tran.Dispose();
tran = null;
}
switch (e.Number)
{
case 208: // Invalid object
// Do not create tables if target has been deleted
if (!Configuration.targets.ContainsKey(targetId))
{
return;
}
SqlServerProbe.CreateTablesForMetricGroup(targetId, metricGroup);
break;
default:
_logger.Error("SqlException: " + e.Message + " ErrorCode: " + e.Number.ToString());
break;
}
}
tryCount++;
}
}
/*
* Prepare SQL statement to save data with right references to the dictionary records
*/
switch (metricGroup.changeSpeed)
{
case ChangeSpeed.Fast:
dataSqlStmt = "INSERT INTO " + dataTableName + " (dt,dictId,";
for (int i = 0; i < metricGroup.NumberOfMetrics; i++)
{
dataSqlStmt += metricGroup.metrics[i].name.Replace(' ', '_') + ",";
}
dataSqlStmt = dataSqlStmt.Remove(dataSqlStmt.Length - 1); // remove last comma
dataSqlStmt += ")" + Environment.NewLine + "VALUES";
for (int i = 0; i < data.NumberOfRows; i++)
{
dataSqlStmt += Environment.NewLine + "('" + SqlServerProbe.DateTimeToString(data.probeDateTime) + "',";
// retrieve corresponding id from dictionary
key = new object[metricGroup.NumberOfMultiRowKeys];
for (int k = 0; k < metricGroup.NumberOfMultiRowKeys; k++)
{
key[k] = data.values[i, k];
}
id = dictCache.GetIdByKey(key);
dataSqlStmt += id.ToString() + ",";
// add metric values
for (int j = 0; j < metricGroup.NumberOfMetrics; j++)
{
dataSqlStmt += SqlServerProbe.DataValueToString(metricGroup.metrics[j].type, data.values[i, metricGroup.NumberOfMultiRowKeys + metricGroup.NumberOfMultiRowKeyAttributes + j]) + ",";
}
dataSqlStmt = dataSqlStmt.Remove(dataSqlStmt.Length - 1); // remove last comma
dataSqlStmt += "),";
}
dataSqlStmt = dataSqlStmt.Remove(dataSqlStmt.Length - 1); // remove last comma
_logger.Trace(dataSqlStmt);
break;
default:
throw new Exception("Unsupported data change speed");
}
/*
* Executes SQL statements
* If tables don't exist, will try to create them and rerun SQL statements
*/
try
{
// save data
using (SqlCommand cmd = this.reposConn.CreateCommand())
{
if (tran != null) // use same transaction as for the dictionary
{
cmd.Transaction = tran;
}
cmd.CommandType = System.Data.CommandType.Text;
cmd.CommandText = dataSqlStmt;
int rowCount = cmd.ExecuteNonQuery();
_logger.Debug("Rows affected: " + rowCount.ToString());
}
if (tran != null)
{
tran.Commit();
}
InMemoryCache.LoadDictionaryIntoCache(targetId, metricGroup, true);
dictCache = Configuration.inMemoryCache[dictTableName];
// Update in-memory data cache
object[] newValues;
dataCache = Configuration.inMemoryCache[dataTableName];
for (int i = 0; i < data.NumberOfRows; i++)
{
key = new object[metricGroup.NumberOfMultiRowKeys];
for (int j = 0; j < metricGroup.NumberOfMultiRowKeys; j++)
{
key[j] = data.values[i, j];
}
id = dictCache.GetIdByKey(key);
newValues = new object[metricGroup.NumberOfMetrics];
for (int j = 0; j < metricGroup.NumberOfMetrics; j++)
{
newValues[j] = data.values[i, metricGroup.NumberOfMultiRowKeys + metricGroup.NumberOfMultiRowKeyAttributes + j];
}
dataCache.AddOrUpdateRowValues(id, new object[0], newValues);
}
canExit = true;
}
catch (SqlException e)
{
_logger.Error("SqlException: " + e.Message + " ErrorCode: " + e.Number.ToString());
if (tran != null)
{
tran.Rollback();
InMemoryCache.LoadDictionaryIntoCache(targetId, metricGroup, true);
}
}
}
} // end of GenerateSqlStaticDict method
// Generates UPDATE statement for closing records and INSERT statement for openning records
private static string GenerateSqlSlowDict(int targetId, MetricGroup metricGroup, ProbeResultingData data, List <Tuple <int, int> > rowsChanged, List <int> rowsNotInDict)
{
CacheTable dict = Configuration.inMemoryCache[InMemoryCache.GetCacheKey(targetId, metricGroup, CacheType.Dictionary)];
string sqlStmt = string.Empty;
// old rows where endDate need to be updated
if (rowsChanged.Count > 0)
{
sqlStmt = "UPDATE " + SqlServerProbe.DictTableName(targetId, metricGroup) + Environment.NewLine;
sqlStmt += "SET endDate = '" + SqlServerProbe.DateTimeToString(data.probeDateTime) + "'" + Environment.NewLine;
sqlStmt += "WHERE";
foreach (Tuple <int, int> ids in rowsChanged)
{
sqlStmt += Environment.NewLine + "(id = " + ids.Item2.ToString() + " AND ";
sqlStmt += "startDate = '" + SqlServerProbe.DateTimeToString((DateTime)dict[ids.Item2][metricGroup.NumberOfMultiRowKeys + metricGroup.NumberOfMultiRowKeyAttributes]) + "')";
sqlStmt += " OR ";
}
sqlStmt = sqlStmt.Remove(sqlStmt.Length - 4); // remove last ' OR '
sqlStmt += ";" + Environment.NewLine;
// new records for changed rows
sqlStmt += "INSERT INTO " + SqlServerProbe.DictTableName(targetId, metricGroup) + " (id,";
for (int i = 0; i < metricGroup.NumberOfMultiRowKeys; i++)
{
sqlStmt += Environment.NewLine + metricGroup.multiRowKeys[i].name.Replace(' ', '_') + ",";
}
for (int i = 0; i < metricGroup.NumberOfMultiRowKeyAttributes; i++)
{
sqlStmt += Environment.NewLine + metricGroup.multiRowKeyAttributes[i].name.Replace(' ', '_') + ",";
}
sqlStmt += "startDate,endDate)" + Environment.NewLine;
sqlStmt += "VALUES " + Environment.NewLine;
foreach (Tuple <int, int> ids in rowsChanged)
{
sqlStmt += "(" + ids.Item2.ToString() + ",";
for (int j = 0; j < metricGroup.NumberOfMultiRowKeys; j++)
{
sqlStmt += SqlServerProbe.DataValueToString(metricGroup.multiRowKeys[j].type, data.values[ids.Item1, j]) + ",";
}
for (int j = 0; j < metricGroup.NumberOfMultiRowKeyAttributes; j++)
{
sqlStmt += SqlServerProbe.DataValueToString(metricGroup.multiRowKeyAttributes[j].type, data.values[ids.Item1, metricGroup.NumberOfMultiRowKeys + j]) + ",";
}
// add startDate and endDate
sqlStmt += "'" + SqlServerProbe.DateTimeToString(data.probeDateTime) + "',NULL),";
}
sqlStmt = sqlStmt.Remove(sqlStmt.Length - 1); // remove last comma
}
// new rows
if (rowsNotInDict.Count > 0)
{
sqlStmt += "INSERT INTO " + SqlServerProbe.DictTableName(targetId, metricGroup) + " (id,";
for (int i = 0; i < metricGroup.NumberOfMultiRowKeys; i++)
{
sqlStmt += Environment.NewLine + metricGroup.multiRowKeys[i].name.Replace(' ', '_') + ",";
}
for (int i = 0; i < metricGroup.NumberOfMultiRowKeyAttributes; i++)
{
sqlStmt += Environment.NewLine + metricGroup.multiRowKeyAttributes[i].name.Replace(' ', '_') + ",";
}
sqlStmt += "startDate,endDate)" + Environment.NewLine;
sqlStmt += "VALUES " + Environment.NewLine;
foreach (int i in rowsNotInDict)
{
sqlStmt += "(NEXT VALUE FOR " + SqlServerProbe.SchemaName(targetId) + ".seq_" + metricGroup.dictTableName + ",";
for (int j = 0; j < metricGroup.NumberOfMultiRowKeys; j++)
{
sqlStmt += SqlServerProbe.DataValueToString(metricGroup.multiRowKeys[j].type, data.values[i, j]) + ",";
}
for (int j = 0; j < metricGroup.NumberOfMultiRowKeyAttributes; j++)
{
sqlStmt += SqlServerProbe.DataValueToString(metricGroup.multiRowKeyAttributes[j].type, data.values[i, metricGroup.NumberOfMultiRowKeys + j]) + ",";
}
// add startDate and endDate
sqlStmt += "'" + SqlServerProbe.DateTimeToString(data.probeDateTime) + "',NULL),";
}
sqlStmt = sqlStmt.Remove(sqlStmt.Length - 1); // remove last comma
}
return(sqlStmt);
} // end of GenerateSqlSlowDict method