JPS6380347A - Retransmission system for file transfer - Google Patents

Abstract

PURPOSE:To decrease the transfer time at the time of retransmission by storing error information and received record items in an external storage device at an error during file transfer and utilizing it to transfer them again. CONSTITUTION:A transfer management processor 32 refers to whether a preceding transfer result is a normal end or an abnormal end by an external storage device 2 at the time of starting transfer. In case of erroneous end, the restart of retransfer and in case of normal end, the start of normal transfer is informed to a reception processor 31. The information of a reception start record position is received from the reception processor 31 and stored in a storage device 2 to start transfer processing. The number of received items is stored in the storage device 2 at each reception record during reception processing. In case of the abnormal end, the number of received record items is acquired from the storage device 2 and the result is pointed out in a record decreased by one from the item number. In case of normal end, a received location is pointed out to a head record of the file as a new transfer. The reception start position is informed to a processor 32 to start the transfer.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a retransmission method for file transfer in reception processing.

(Conventional technology) Conventionally, this type of file transfer retransmission method retransmitted data from the beginning of the file when a failure occurred, without retaining failure information or the number of received records. .

(Problems to be Solved by the Invention) In the conventional file transfer retransmission method described above, data is transferred before a failure occurs, so the portion written in the file becomes invalid, making it extremely difficult to retransmit large files. had the disadvantage of low efficiency.

An object of the present invention is to retain failure information and the number of received records in an external storage device for management information when a failure occurs during file transfer, and to utilize the failure information and received records held in the external storage device for management information. It is an object of the present invention to provide a retransmission method for file transfer that is configured to eliminate the above-mentioned drawbacks and shorten the transfer time at the time of retransmission by performing the transfer again.

(Means for Solving the Problems) The transfer retransmission method according to the present invention executes a reception process that outputs a file to an external storage device for reception, and also provides failure information and the number of received records when a failure occurs during file transfer. a first processing means for retaining the information in the external storage device for management information, and a second processing means for retransferring the information using the failure information and the number of received records that are not retained in the external storage device for management information. The apparatus is configured to include a processing means.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an online system that implements the entire file transfer retransmission method according to the present invention. In FIG. 1, l is an external storage device for reception, 2 is an external storage device for management information, 3 is an online system, and 4
is a transmission device.

Further, 31 is a reception processor, and 32 is a transfer management processor.

In FIG. 1, the online system 3 includes an external storage device 1 for reception, an external storage device 2 for management information, and a transmission device 4.
is connected to the external storage device 1 for receiving received data.
A transfer management processor 32 that controls data from the transmission device 4, holds the information in the external storage device 2 for management information, and passes the data to the reception processor 31. It is.

The received data is passed from the transfer management processor 32 to the reception processor 31 via the transmission device 4, and is stored in the reception external storage device.

Next, the operation of this embodiment will be explained with reference to FIGS. 2 and 3.

FIG. 2 is a flowchart showing the retransmission method of the transfer management processor 32. In FIG. 2, before starting the transfer, the transfer management processor 32 refers to the external storage device 2 for management information to determine whether the prefixed transfer result was a normal end or an abnormal end. If it has ended abnormally, the reception processor 31 is notified of the start of retransmission transfer in step (2), and if it has ended normally, the reception processor 31 is notified of the start of normal transfer in step (2).

When receiving a notification of the reception start record position from the receiving processor 31, the image information is held in the management information external storage device 2 in step (2), and transfer processing is started in step (2). During the reception process, the number of receptions is held in the management information storage device 2 for each reception record in step (2).

FIG. 8 is a flowchart showing the retransmission method of the reception processor 31. In FIG. 8, the reception processor 31 receives a notification of the transfer status from the transfer management processor 32 in step (2). If the process ends abnormally, the number of received records is obtained from the management information external storage device 2 in step (2), and points to the record that is less than the number by 1. If the process ends normally, in the second step, the reception start position is pointed to the first record of the file as a new transfer.

The reason for pointing to a record that is less than the number of received records by 1 is that even if the transfer management processor 32 writes the number of received records to the external storage device 2 for management information, the record is written in the external storage device 1 for reception. Since there is a possibility that a failure may occur before, there is a possibility that the number of written records is 91 fewer than the number of received records.

Once the reception start position is determined, the corresponding information is notified to the transfer management processor 32 in the Oth step.

After starting the transfer in step 0, the record received in step ◎ is written to the previously pointed position.

(Effects of the Invention) As explained above, the present invention stores failure information and the number of injury records in one external storage device for management information in the event of a failure during file transfer. By retransferring using the fault information and received record, the retransmission process is executed (to the next record after the damaged record), so retransmission processing is enabled.
Moreover, there is an effect that it can be executed efficiently.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a retransmission method for file transfer according to the present invention. FIG. 2 is a flowchart showing an example of processing executed by the transfer management processor. FIG. 3 is a flowchart showing an example of processing executed by the reception processor. ], 2...External storage device 3...Online system 4...Transmission device 31.32...Processor

Claims (1)

[Claims] A first processing means for executing a receiving process for outputting a file to an external storage device for receiving, and for causing the external storage device for management information to retain failure information and the number of received records in the event of a failure during file transfer. and a second processing means for performing transfer again using the failure information and the number of received records held in the external storage device for management information. Transfer retransmission method.