/// <inheritdoc />
public async Task <Checkpoint> CreateCheckpointIfNotExistsAsync(string partitionId)
{
CheckpointEntry checkpoint;
using (_logger.BeginScope("Create checkpoint"))
{
_checkpointUpdateCounter.Increment();
_logger.LogDebug("Checkpoint partition {partitionId}", partitionId);
checkpoint = await ReadCheckpointFromFileAsync(partitionId).ConfigureAwait(false);
if (checkpoint == null)
{
_logger.LogInformation("Checkpoint not found for partition {partitionId}, creating", partitionId);
var fileName = GetFileName(partitionId);
var newCheckpoint = new CheckpointEntry {
PartitionId = partitionId, Owner = _eventProcessorName
};
var json = newCheckpoint.ToJson();
_logger.LogTrace("Checkpoint json: ", json);
try
{
await File.WriteAllTextAsync(fileName, json, ContainerLifecycle.CancellationToken).ConfigureAwait(false);
_logger.LogDebug("Checkpoint complete for file {fileName}", fileName);
checkpoint = newCheckpoint;
}
catch (Exception e)
{
_logger?.LogError(e, "Error writing checkpoint file {fileName}", fileName);
_checkpointErrorCounter.Increment();
}
}
else
{
_logger?.LogTrace("Checkpoint found for partition {partitionId}", partitionId);
}
}
return(checkpoint);
}
