/// <summary>
/// Creates a checkpoint for a given sequence point.
/// </summary>
public Task <BoolResult> CreateCheckpointAsync(OperationContext context, EventSequencePoint sequencePoint)
{
context = context.CreateNested();
string checkpointId = "Unknown";
long checkpointSize = 0;
return(context.PerformOperationAsync(
_tracer,
async() =>
{
bool successfullyUpdatedIncrementalState = false;
try
{
// Creating a working temporary directory
using (new DisposableDirectory(_fileSystem, _checkpointStagingDirectory))
{
// NOTE(jubayard): this needs to be done previous to checkpointing, because we always
// fetch the latest version's size in this way. This implies there may be some difference
// between the reported value and the actual size on disk: updates will get in in-between.
// The better alternative is to actually open the checkpoint and ask, but it seems like too
// much.
checkpointSize = _database.GetContentDatabaseSizeBytes().GetValueOrDefault(-1);
// Saving checkpoint for the database into the temporary folder
_database.SaveCheckpoint(context, _checkpointStagingDirectory).ThrowIfFailure();
if (_configuration.UseIncrementalCheckpointing)
{
checkpointId = await CreateCheckpointIncrementalAsync(context, sequencePoint);
successfullyUpdatedIncrementalState = true;
}
else
{
checkpointId = await CreateFullCheckpointAsync(context, sequencePoint);
}
return BoolResult.Success;
}
}
finally
{
ClearIncrementalCheckpointStateIfNeeded(context, successfullyUpdatedIncrementalState);
}
},
extraStartMessage: $"SequencePoint=[{sequencePoint}]",
extraEndMessage: result => $"SequencePoint=[{sequencePoint}] Id=[{checkpointId}] SizeMb=[{(checkpointSize < 0 ? checkpointSize:checkpointSize*1e-6)}]"));
}
