/// <summary>
/// Initializes a new instance of the BeginCheckpointLogRecord class.
/// </summary>
/// <param name="dummy">Used to indicate that this is not an Invalid BeginCheckpointLogRecord.</param>
private BeginCheckpointLogRecord(bool dummy)
: base(LogRecordType.BeginCheckpoint, LogicalSequenceNumber.ZeroLsn, null)
{
this.IsFirstCheckpointOnFullCopy = false;
this.progressVector = ProgressVector.Clone(ProgressVector.ZeroProgressVector, 0, LogicalSequenceNumber.ZeroEpoch, LogicalSequenceNumber.ZeroEpoch);
this.earliestPendingTransactionOffset = 0;
this.earliestPendingTransaction = null;
this.checkpointState = CheckpointState.Completed;
this.lastStableLsn = LogicalSequenceNumber.ZeroLsn;
this.epoch = LogicalSequenceNumber.ZeroEpoch;
// Indicates that a full backup has not been taken yet.
this.highestBackedUpEpoch = LogicalSequenceNumber.ZeroEpoch;
this.highestBackedUpLsn = LogicalSequenceNumber.ZeroLsn;
// Indicates that the current backup stream has zero logs and hence 0 KB size.
this.backupLogRecordCount = (uint)0;
this.backupLogSize = (uint)0;
this.earliestPendingTransactionInvalidated = 0;
this.lastPeriodicCheckpointTimeTicks = DateTime.Now.Ticks;
this.lastPeriodicTruncationTimeTicks = this.lastPeriodicCheckpointTimeTicks;
}
/// <summary>
/// Initializes a new instance of the BeginCheckpointLogRecord class.
/// </summary>
/// <remarks>Called when the replicator decides to checkpoint.</remarks>
internal BeginCheckpointLogRecord(
bool isFirstCheckpointOnFullCopy,
ProgressVector progressVector,
BeginTransactionOperationLogRecord earliestPendingTransaction,
Epoch headEpoch,
Epoch epoch,
LogicalSequenceNumber lsn,
PhysicalLogRecord lastLinkedPhysicalRecord,
BackupLogRecord lastCompletedBackupLogRecord,
uint progressVectorMaxEntries,
long periodicCheckpointTimeTicks,
long periodicTruncationTimeTicks)
: base(LogRecordType.BeginCheckpoint, lsn, lastLinkedPhysicalRecord)
{
this.IsFirstCheckpointOnFullCopy = isFirstCheckpointOnFullCopy;
this.progressVector = ProgressVector.Clone(progressVector, progressVectorMaxEntries, lastCompletedBackupLogRecord.HighestBackedUpEpoch, headEpoch);
this.earliestPendingTransactionOffset = LogicalLogRecord.InvalidLogicalRecordOffset;
this.earliestPendingTransaction = earliestPendingTransaction;
this.checkpointState = CheckpointState.Invalid;
this.lastStableLsn = LogicalSequenceNumber.InvalidLsn;
this.epoch = (earliestPendingTransaction != null) ? earliestPendingTransaction.RecordEpoch : epoch;
// Initialize backup log record fields.
this.highestBackedUpEpoch = lastCompletedBackupLogRecord.HighestBackedUpEpoch;
this.highestBackedUpLsn = lastCompletedBackupLogRecord.HighestBackedUpLsn;
this.backupLogRecordCount = lastCompletedBackupLogRecord.BackupLogRecordCount;
this.backupLogSize = lastCompletedBackupLogRecord.BackupLogSizeInKB;
this.earliestPendingTransactionInvalidated = 0;
this.lastPeriodicCheckpointTimeTicks = periodicCheckpointTimeTicks;
this.lastPeriodicTruncationTimeTicks = periodicTruncationTimeTicks;
this.UpdateApproximateDiskSize();
}