JPH0247750A - File transfer device - Google Patents

Abstract

PURPOSE:To effectively and efficiently execute the retransmission processing by executing the retransmission processing from the text following a processed text even in the case of the destination system to which a variable text is transmitted. CONSTITUTION:A file transfer device 5 is provided with a reception processing device 2 which stores reception data in an external storage device 1 for reception. A transfer management processing device 3 stores the processing position of reception data, which is stored in the external storage device 1 for reception through the reception processing device 2, in an external storage device 4 for management information at the time of the occurrence of trouble. The reception processing device 2 reads out position information stored in the external storage device 4 for management information at the time of retransmission and writes reception data in the external storage device 1 for reception in accordance with this information.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is utilized in a file transfer device in an online data processing system.

The present invention relates to a file transfer device in an online data processing system that has a reception processing means for outputting to a reception storage device. Here, a file refers to a collection of data that has a logical meaning according to established rules.

〔overview〕

The present invention provides a checkpoint in a file transfer device that stores received data from a partner system in a receiving storage device, so that when a file transfer failure occurs, the data is retransmitted starting from the next data received before the failure occurs. By performing retransmission using the acquired checkpoint, retransmission processing can be executed effectively and efficiently even to the other party's system to which the variable text is transmitted.

[Conventional technology]

Conventionally, the retransmission method for file transfer in this type of file transfer device does not acquire checkpoints, so for systems that send fixed-length text over the line, it is difficult to calculate the number of records from the number of texts. It was possible to calculate and resend from an intermediate record, but in other cases, resend was performed from the beginning of the file.

[Problem that the invention seeks to solve]

With the conventional file transfer devices mentioned above, retransmission from the middle after a failure is only possible when text on the line is sent in a fixed length. This had the drawback that the data transferred to the file and written to the file became invalid, resulting in extremely low efficiency.

An object of the present invention is to provide a file transfer device that can reduce the transfer time during retransmission by eliminating the above-mentioned drawbacks.

[Means for solving problems]

The present invention provides a file transfer device that includes a reception storage device that stores reception data from a partner system and a reception processing device that stores the reception data in the reception storage device, when a failure occurs during file transfer. , further comprising checkpoint acquisition means for acquiring a checkpoint for starting retransmission from data subsequent to the data received before the occurrence of a failure, and the reception processing device performs retransmission using the checkpoint acquired by the checkpoint acquisition means. It is characterized by including means for performing.

[Effect]

The checkpoint acquisition means has, for example, a storage device for management information, and when a failure occurs, the processing position (checkpoint) of the received data stored in the storage device for reception via the reception processing device is transferred to the storage device for management information. Store in. Then, the reception processing device reads the position information stored in the management information storage device at the time of retransmission, and writes the received data to the reception storage device in accordance with the position information.

Therefore, even for a partner system that transmits variable text, reprocessing can be performed starting from the next text after the processed text, making it possible to perform retransmission processing effectively and efficiently.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the main parts of an embodiment of the present invention.

This embodiment includes a receiving external storage device 1 as a receiving storage device that stores received data from a partner system, and a receiving processing device 2 that performs storage processing of the received data in this receiving external storage device 1. In the file transfer device 5,
Equipped with a transfer management processing device 3 and an external storage device 4 for management information as a checkpoint acquisition means for acquiring a checkpoint for starting retransmission from the next data of the data received before the failure occurs when a failure occurs during file transfer. , the reception processing device 2 includes means for performing retransmission based on the checkpoint acquired by the transfer management processing device 3 and the external storage device 4 for management information. Note that 6 is an online system and 7 is a transmission device.

Here, the receiving external storage device 1 has a means for storing received data from a partner system in file transfer, storing data from the beginning when transferring a new file, and storing data from a specified position when retransmitting midway.

The management information external storage device 2 stores the processing position of the received data so that the reception processing device 2 can write the received data to the reception external storage device from the middle.

The reception processing device 2 determines the relationship between the position of the received data (which data is received) and the position when the data is written to the external storage device 1 for reception, for the received data from the partner system. get. This is used as the reception start position when starting retransmission midway.

The transfer management processing device 3 manages the data received from the other party's system as received text. The received text is a unit that indicates the starting position for retransmission and is based on the ST on the protocol.
The period from X (text start control code) to ETX (text end control code) is defined as one text. The number of the first record in the received text is acquired and stored in the management information external storage device 4 so that the reception processing device 2 can refer to it when retransmitting it.

The transmission device 7 is a line and O8 that enable data exchange with the partner system.

The features of the present invention include a transfer management processing device 3 as a checkpoint acquisition means and an external storage device 4 for management information,
The present invention is characterized in that a reception processing device 2 including a means for retransmission based on the acquired checkpoint is provided.

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

FIG. 2 is a flowchart showing the processing procedure of the transfer management processing device 3. Before starting the transfer, the transfer management processing device 3 refers to whether the previous transfer result was a normal end or an abnormal end in the management information external storage device 4 (step Sl). If it is normal, the receiving processing device 2 is notified to start normal transfer (step S2), and if it is abnormal, the receiving processing device 2 is notified to start retransmission transfer (step S3). Upon receiving notification of the number of received texts and the first record number in the latest received text from the reception processing device 2, the information is retained in the external storage device 2 for management information (step S4) and transfer is started (step S4).
5). At this time, when the reception processing device 2 is notified of the start of normal transfer, the number of texts received from the reception processing device 2 is always 0, and the first record number in the latest received text is always 1. During the reception process, the transfer management processing device 3 holds the number of received texts and the first record number in the latest received text in the management information external storage device 4 at the time of receiving the text (step S6.37). Here, the first record number in the latest received text is the number of records written in the receiving external storage device 1 +1.

FIG. 3 is a flowchart showing the processing procedure of the reception processing device 2. The reception processing device 2 receives a notification of the transfer status from the transfer management processing device 3 (step 511), and if it ends normally, a new normal transfer starts, so the number of received texts is O, and the first record number in the latest received text is 1. is held as internal information (step 512). If the process ends abnormally, the number of received texts and the first record number in the latest received text are acquired from the management information external storage device 2 and held as internal information (step 513). Next, point to the first record number in the latest received text held in internal information as the file reception start position (step 514).
. When the point to the reception start position is completed, the transfer management processing device 3 is notified of the number of received texts and the first record number in the latest received text (step 515). After starting the transfer (step 516), the received record is written from the previously pointed position (step 517).

〔Effect of the invention〕

As explained above, in the case of a failure during file transfer, the present invention stores, for example, failure information, the number of received texts, and the first record number in the latest received text in an external storage device for management information. By performing retransmission using the failure information held in the external storage device, the number of received texts, and the first record number in the most recently received text, processing can be performed even for a partner system that sends variable text. Since the retransmission process is executed from the next text after the completed text, the retransmission process can be executed effectively and efficiently.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the main parts of an embodiment of the present invention. FIG. 2 is a flowchart showing the processing procedure of the transfer management processing device. FIG. 3 is a flowchart showing the processing procedure of the reception processing device. 1... external storage device for reception, 2... reception processing device,
3... Transfer management processing device, 4... External storage device for management information, 5... File transfer device, 6... Online system, 7... Transmission device, 81-S7, SL1-S17. ...step.

Claims (1)

[Claims] 1. A file comprising a receiving storage device (1) that stores received data from a partner system, and a receiving processing device (2) that stores the received data in this receiving storage device. The transfer device (5) includes checkpoint acquisition means (3, 4) for acquiring a checkpoint for starting retransmission from data subsequent to the data received up to the occurrence of the failure in the event of a failure during file transfer; A file transfer device characterized in that the processing device includes means for performing retransmission using the checkpoint acquired by the checkpoint acquisition means.