public void Execute(CancellationToken cancellationToken)
{
foreach (var table in ProcessedTables)
{
Logger.DebugFormat("Removing outdated records from table '{0}'...", table);
int removedCount = 0;
do
{
_storage.UsingDatabase(connection =>
{
if (
connection.DataProvider.GetSchemaProvider()
.GetSchema(connection)
.Tables.Any(t => t.TableName.ToLowerInvariant() == table.ToLowerInvariant()))
{
using (
var lck = _storage.GetConnection()
.AcquireDistributedLock(DistributedLockKey, DefaultLockTimeout))
{
removedCount = connection.Execute(
String.Format(@"
SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
START TRANSACTION;
delete from {0}.{1} where ExpireAt < @now limit @count;
COMMIT;", connection.DataProvider.GetSchemaProvider().GetSchema(connection).Database, table),
new { now = DateTime.UtcNow, count = NumberOfRecordsInSinglePass });
}
}
});
if (removedCount > 0)
{
Logger.Trace(String.Format("Removed {0} outdated record(s) from '{1}' table.", removedCount,
table));
cancellationToken.WaitHandle.WaitOne(DelayBetweenPasses);
cancellationToken.ThrowIfCancellationRequested();
}
} while (removedCount != 0);
}
cancellationToken.WaitHandle.WaitOne(_checkInterval);
}