/**
* Returns the optimal part size, in bytes, for each individual part upload in a multipart upload.
*
* @param putObjectRequest The request containing all the details of the upload.
* @param configuration Configuration values to use when calculating size.
* @return The optimal part size, in bytes, for each individual part upload in a multipart upload.
*/
public static long calculateOptimalPartSize(
PutObjectRequest putObjectRequest, TransferManagerConfiguration configuration) {
double contentLength = TransferManagerUtils.getContentLength(putObjectRequest);
double optimalPartSize = contentLength / MAXIMUM_UPLOAD_PARTS;
// round up so we don't push the upload over the maximum number of parts
optimalPartSize = Math.ceil(optimalPartSize);
return (long) Math.max(optimalPartSize, configuration.getMinimumUploadPartSize());
}
/**
* Calculates the optimal part size of each part request if the copy operation is carried out as
* multi-part copy.
*
* @param copyObjectRequest the original request.
* @param configuration configuration containing the default part size.
* @param contentLengthOfSource content length of the Amazon S3 object.
* @return the optimal part size for a copy part request.
*/
public static long calculateOptimalPartSizeForCopy(
CopyObjectRequest copyObjectRequest,
TransferManagerConfiguration configuration,
long contentLengthOfSource) {
double optimalPartSize = (double) contentLengthOfSource / (double) MAXIMUM_UPLOAD_PARTS;
// round up so we don't push the copy over the maximum number of parts
optimalPartSize = Math.ceil(optimalPartSize);
return (long) Math.max(optimalPartSize, configuration.getMultipartCopyPartSize());
}
/**
* Returns true if the the specified request should be processed as a multipart upload (instead of
* a single part upload).
*
* @param putObjectRequest The request containing all the details of the upload.
* @param configuration Configuration settings controlling how transfer manager processes
* requests.
* @return True if the the specified request should be processed as a multipart upload.
*/
public static boolean shouldUseMultipartUpload(
PutObjectRequest putObjectRequest, TransferManagerConfiguration configuration) {
long contentLength = TransferManagerUtils.getContentLength(putObjectRequest);
return (contentLength > configuration.getMultipartUploadThreshold());
}