I am trying write an application to continuously upload large data (multipart uploads) to Amazon's S3 Storage. However, my application needs to be able to shut down mid-transfer and pick up from where it left off the next time it's restarted.
From playing around a little bit with the C++ SDK, the TransferManager class provides a RetryUpload function that requires a shared pointer to the TransferHandle object that is returned upon issuing an initial UploadFile call. However, the transfer handle object will no longer be in existence if the application crashes or has to shut down mid-operation.
In such a case, is it possible to resume a multipart upload using the TransferManager class? In effect, this probably requires the reconstruction of the transfer handle object, which I am not quite sure how to do. It seems that the TransferManager class is just a nice wrapper around the S3Client, which seems to be more clearer on how to resume the operation but also seems to be more painful to use for general multipart uploading