ome.formats.importer.transfers

Interface FileTransfer

All Known Implementing Classes:

AbstractExecFileTransfer, AbstractFileTransfer, CopyFileTransfer, CopyMoveFileTransfer, HardlinkFileTransfer, MoveFileTransfer, SymlinkFileTransfer, UploadFileTransfer, UploadRmFileTransfer

public interface FileTransfer

Abstracted concept of "getting the file to the server". A single FileTransfer instance should be used for all the instances in a single "import". Implementations are responsible for making sure that when the server accesses the remote (i.e. server-side) location that a file-like object (file, hard-link, soft-link, etc.) is present with the right size and checksum. Transfer implementations have a number of responsibilities such as reporting on progress and estimating remaining time which make them not completely trivial to implement. Sub-classing an existing implementation is likely the easiest way to modify behavior. Implementations should be thread-safe, i.e. callable from multiple threads, and blocking should be avoided if at all possible.

Since:

5.0

Method Summary

Modifier and Type	Method and Description
void	afterTransfer(int errors, List<String> transferredFiles) Callback which must be invoked after a related set of files has been processed.
String	transfer(TransferState state) Transfers a file and returns the appropriate checksum string for the source file.

Method Detail

transfer

String transfer(TransferState state)
         throws IOException,
                omero.ServerError

Transfers a file and returns the appropriate checksum string for the source file. The TransferState instance should be unique for this invocation, i.e. not used by any other threads. After execution, the fields can be inspected to see, e.g., the newly created file.

Throws:

IOException

omero.ServerError

afterTransfer

void afterTransfer(int errors,
                   List<String> transferredFiles)
            throws CleanupFailure

Callback which must be invoked after a related set of files has been processed. This provides the FileTransfer instance a chance to free resources. If any errors have occurred, then no destructive changes should be made, though the user may should be given the option to react.

Throws:

CleanupFailure