JPH0619819A - Transmission/reception controller - Google Patents

Abstract

PURPOSE:To prevent the overload of a server and to avoid the reduction of the processing efficiency of the server on account of an overload by adjusting an interval for issuing a processing request on a client-side issuing the processing request. CONSTITUTION:A command processing part 1 is composed of a request reception part 11 and a timer 13. The request reception part 11 reads the time of the timer 13 at the time of receiving a command frame from terminal equipments (20-1) to (n) as request reception time and notifies the command processing part of the command frame. In such a case, the command processing part 1 adds processing time required for a data processing for which a command issuing part 2 requests to a response frame and returns it to the command issuing part 2. The command issuing part 2 delays the timing of issuing the command frame for a next processing request when processing time added to the response frame exceeds prescribed time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission / reception control device. In a network system such as a financial institution, a processing device (called a server) that processes asynchronous data processing requests from a plurality of terminal devices (called clients) connected via a communication line When the number of requested clients exceeds a certain range, an overload occurs, and the processing device reaches the limit of its processing capacity.

It is necessary to monitor a client's data processing request that exceeds the processing capability of the processing device.

[0003]

2. Description of the Related Art FIG. 7 shows a conventional system configuration diagram. In a network system such as an online banking system, as shown in FIG. 7, terminals ai (i = 1,2, ..., n) called terminals that request data processing, terminals bi (i = 1,
2, ..., N) and a processing device 4 called a server that is connected to the terminals ai and bi via a communication line.

The processor 4 has a main controller 42 and a task Si (i = 1, 1) to which a CPU is assigned to execute a program.
2, ..., N) and a communication control unit 41.
The communication control unit 41 establishes a line connection with the terminals ai and bi based on processing requests from the terminals ai and bi to perform data processing, that is, a task program and task Si and terminals ai and bi.
Fulfills the function of establishing a logical communication path.

The task Si performs data processing such as balance inquiry, deposit / withdrawal processing, and file transfer for each type of banking business. With reference to the task processing sequence shown in FIG. 8, a description will be given below of a case where a task request such as balance inquiry or deposit processing is made to the task S1 from the terminals ai and bi.

[0006] When an inquiry request for a balance inquiry is sent from the terminal a1 to the processing device 4, the task S1 of the processing device 4 starts processing with the terminal a1. Task S
If a processing request is issued from another terminal a2 to the processing device 4 while one is executing the balance inquiry processing for the terminal a2, the execution of the task S1 is suspended. Main control unit 42
Acquires a processing request from the terminal a1 via the communication control unit 41, analyzes the content of the request, and notifies a predetermined task Si to execute the processing request.

If the task Si is the task S1, the task S1 registers the processing request, for example, in a queue in order to process the request of the terminal a2 after the processing of the terminal a1 currently being processed is completed. After performing the process (1), the process returns to the process of the terminal a1 (request reception in FIG. 8).

If a request from the terminal b1 occurs again before the processing for the terminal a1 is completed, the execution of the task S1 is interrupted (request acceptance in FIG. 8). Terminal a of task S1
When the process for 1 is completed, the task S1 transmits the process result to the terminal a1 (in FIG. 8), and then moves to the process of the terminal a2.

[0009]

Task S of processing device 4
A client that issues a processing request for i (terminals ai, b
If the number of i) increases, the task Si that is being executed is frequently interrupted for request reception processing, resulting in an increase in the overhead of the processing device 4, and the terminal side until obtaining the requested processing result. There is a problem that an overloaded state of data processing such as taking a long time occurs, and the terminal requests the processing device 4 to release the connection with the task Si (release the session), etc. It was

An object of the present invention is to prevent deterioration of data processing efficiency due to occurrence of an overloaded state of the processing device 4 in advance.

[0011]

FIG. 1 is a block diagram showing the principle of the present invention. The processing device has a plurality of terminal devices and a communication line 25.
In the network system which is connected by the above and transmits and receives data by the transmission control method based on HDLC, the command processing unit 1, the request receiving unit 11, and the processing unit 10 having the timer 13, and the command frame to the processing unit 10. The command processing unit 1 includes a terminal device 20-1, 2, 3, ..., N having a command transmitting unit 2 for transmitting and requesting data processing. The command processing unit 1 includes a request receiving unit 11 and a timer 13. Consists of the request reception unit 11
When receiving a command frame from the terminal device 20-1, 2, 3, ..., N, the timer reads the time of the timer 13 as the request reception time, notifies the command processing unit 1 of the command frame, When a response frame transmission request is issued from the processing unit 1, the time of the timer 13 is read, the elapsed time from the request reception time is added to the response frame, and the terminal devices 20-1, 2, 3, ... , n, and when the command processing unit 1 receives the notification of the command frame from the request receiving unit 11, the command processing unit 1 performs data processing based on the request of the terminal devices 20-1, 2, 3, ..., N. When the command transmission unit 2 receives the response frame from the processing device 10, the request reception unit 11 is requested to transmit a response frame for notifying the completion of the data processing. Exceeds the specified value If so, the transmission of the command frame requesting the next data processing to the processing device 10 is delayed.

[0012]

The command processing unit 1 adds the processing time required for the data processing requested by the command transmitting unit 2 to the response frame and returns the response frame to the command transmitting unit 2, and the command transmitting unit 2
If the processing time added to the response frame exceeds a predetermined time, by delaying the timing of transmitting the command frame of the next processing request by a predetermined time,
The overload state of the processing device 10 is reduced.

[0013]

Embodiment FIG. 2 shows a system configuration diagram of an embodiment. Figure 2
Represents an online network system of a financial institution or the like, which is a terminal device 20-i (i = 1,2,3, ..., n) called a client that issues a data processing request, and the terminal device 20. -i (i = 1, 2, 3, ..., N) and a processing device 10 called a server that is connected via a communication line 25, and a file device 16 having a customer file 18.

The terminal device 20-i includes a communication control unit 24 and a timer.
22, a transmission / reception processing unit 21, a transmission suppression unit 27, a command transmission unit 2 having a delay flag 28, and an input / output operation unit 29. As an example, an automatic installation installed in a store such as a financial institution. Configure a transaction device.

The processing device 10 (server) includes a communication control unit 14
, Request receiving unit 11, timer 13, task 12, and queue
And a command processing unit 1 having 15 The sequence in the communication between the terminal device 20-i and the processing device 10 is
A command (request for processing to the processing device) and a response (response to the command) by a frame which is a transmission unit of HDLC are used.

In the block diagram of the transmission / reception frame of FIG.
20 shows a transmission / reception data format exchanged between 20-i and the processing device 10. In FIG. 3, F (flag sequence), A (address), C (control field), FC
The S (frame check sequence) is used as control information when the communication control unit 14 establishes a communication path between the processing device 10 and the terminal device 20-i, and data is transmitted and received.

The transmission / reception processing unit 21 is a data input from the input / output operation unit 29 by a customer who uses the terminal device 20-i to perform deposit / withdrawal processing and balance inquiry, for example, a personal identification number, an amount, and a deposit. The data recorded on the card is read and transmitted to the processing device 10 via the communication control unit 24 (transmission of a processing request).

The transmission / reception processing unit 21 also performs processing for displaying on a display (not shown) or the like of the input / output operation unit 29 based on the data of the transmission / reception frame received from the processing device 10 via the communication control unit 24.

In the initial state of the display of the input / output operation unit 29, a work menu that the customer can select is displayed.
The customer selects deposit / withdrawal processing, balance inquiry, etc. from the work menu. Hereinafter, assuming a case where the balance inquiry process is selected, the description will be given according to the explanatory diagram of request transmission and result transmission of FIG. 4 and the command / response procedure at the start of transmission / reception of FIG.

Referring to FIG. 5, in a processing step 70, the transmission / reception processing unit 21 of the command transmission unit 2 receives the data (called processing request data, such as a personal identification number) input by the customer from the input / output operation unit 29 for business processing. Read. In processing step 71, the transmission / reception processing unit 21 transmits a command frame composed of the input processing request data to the processing device 10 (request transmission in FIG. 4).

In step 72, the communication controller of the processing device 10
14 receives the processing request data from the terminal device 20-i, and notifies the request receiving unit 11 of the command processing unit 1. In processing step 73, the request receiving unit 11 sends the processing request data to the communication control unit 14
The processing request data is registered in the queue 15 in which the processing waiting data of the task 12 is stored, and the time (TA) is read from the timer 13 and recorded.

In process step 74, task 12 waits in queue 15
Is checked, and the registered processing request data is stored in the FIFO (
A first-in first-out method) is used to retrieve the customer's balance by, for example, processing a balance inquiry based on the processing request data, that is, searching the customer file 18 of the file device 16.

In processing step 75, the task 12 passes the data, "deposit balance", obtained as a result of the processing, to the request receiving unit 11.
In processing step 76, the request receiving unit 11 reads the time (TB) from the timer 13, calculates the elapsed time Tp (= TB-TA), and adds the elapsed time Tp to the processing result data (FIG. 3). ) Is requested to the communication control unit 14.

In processing step 77, the communication control unit 14 returns the response frame composed of the elapsed time Tp and the data "deposit balance" to the terminal device 20-i (send result in FIG. 4).
). In processing step 78, the command transmission unit 2 of the terminal device 20-i
Receives the frame via the communication control unit 24, and the transmission / reception processing unit 21 determines the elapsed time Tp in the processing step 79 by the transmission suppressing unit 27.
To notify.

At processing step 80, the transmission / reception processing section 21 performs processing based on the received data, that is, processing such as displaying the deposit balance on the display of the input / output operation section 29. Next, the command transmission delay process will be described with reference to FIG.

The transmission suppressing unit 27 is notified of the elapsed time Tp from the transmission / reception processing unit 21, and judges from the value of Tp whether the processing device 10 is in an overloaded state in the data transmission / reception process with the terminal device 20-i. In order to do so, in processing step 90 of FIG. 6, it is checked whether or not the value of the elapsed time Tp exceeds a predetermined value (= S 1).

If the elapsed time Tp> S (the value of the elapsed time Tp exceeds S), it is judged that the network is overloaded and the delay time (= Y 1) is reached in processing step 91.
To calculate. The delay time is, for example, a value of Y = Tp (1 + 0.3) with the elapsed time Tp as a variable.

Next, in the processing step 92, the transmission suppressing unit 27 sets the delay time Y in the timer 22 and sets the delay flag 28 to ON. On the other hand, the transmission / reception processing unit 21 performs processing step 93 based on the input data from the input / output operation unit 29, and then the processing device 10
The command frame data for making a request is generated. When the generation of data is completed, before sending a request to the processing device 10, it is checked in step 94 whether or not the delay flag 28 is set. If the flag is not set, the communication controller 24 is passed through in step 96. Send a command frame with.

When the delay flag 28 is set, the process waits for an interrupt that occurs when the time Y set in the timer 22 at step 95 has elapsed. If there is a timer interrupt, the delay flag 28 is cleared in processing step 96, and the command frame is transmitted (request transmission) in processing step 97.

If the elapsed time Tp ≦ S, the process proceeds to processing step 92. That is, the command frame is transmitted without considering the delay processing.

[0031]

[Effects of the Invention] Based on the elapsed time Tp that increases / decreases in conjunction with the load of the processing device 10 (server), the client side that issues a processing request adjusts the interval for issuing the processing request, thereby overloading the server. Can be prevented in advance, and a decrease in server processing efficiency due to overload can be avoided.

[Brief description of drawings]

FIG. 1 is a block diagram of the principle of the present invention.

FIG. 2 is a system configuration diagram of an embodiment.

FIG. 3 is a block diagram of a transmission / reception frame

FIG. 4 is an explanatory diagram of request transmission and result transmission.

[Figure 5] Command / response procedure at the start of transmission / reception

[Fig. 6] Delay processing procedure for command transmission

FIG. 7: Conventional system configuration diagram

[Figure 8] Task processing sequence

[Explanation of symbols]

 1 is a command processing unit, 10 and 4 are processing devices, 11 is a request receiving unit, 12, S1, S2, ..., Sn is a task, 13,22 is a timer, 14, 24 and 41 are communication control units, 15 Is a queue, 16 is a file device, 18 is a customer file, 2 is a command transmission unit, 20-1,2,3, ..., n is a terminal device, 21 is a transmission / reception processing unit, 25 is a communication line, and 27 is Transmission suppression unit, 28 is a delay flag, 29 is an operation input / output unit, 42 is a main control unit, a1, a2, ..., an, b1, b2, ..., bn are terminals, 70,71, ~, 79, 80, 90, 91, ~ 97 represent processing steps.

Claims (1)

[Claims] 1. In a network system in which a processing device is connected to a plurality of terminal devices via a communication line (25) to exchange data by a transmission control system based on HDLC, a command processing unit (1) and a request receiving unit ( 11), a processing device (10) having a timer (13), and a terminal device (20-1) having a command transmission section (2) for requesting data processing by transmitting a command frame to the processing device (10). , 2, 3, 3, ..., N), the command processing unit (1) includes a request receiving unit (11) and a timer (13), and the request receiving unit (11) is Terminal device (20-1,2,3, ...,
When a command frame is received from n), the time of the timer (13) is read as the request reception time, the command processing unit (1) is notified of the command frame, and the command processing unit (1) requests the transmission of a response frame. If so, the time of the timer (13) is read, the elapsed time from the request reception time is added to the response frame, and the response frame is transmitted to the terminal device (20-1, 2, 3, ..., N), When the command processing unit (1) receives the command frame notification from the request receiving unit (11), the command processing unit (1) performs data processing based on the request from the terminal device (20-1, 2, 3, ..., N). Then, the request reception unit (11) is requested to transmit a response frame for notifying the completion of the data processing, and when the command transmission unit (2) receives the response frame from the processing device (10), the response frame is changed to the response frame. Added A transmission / reception control device, which delays the transmission of a command frame requesting the next data processing to the processing device (10) when the elapsed time data exceeds a predetermined value.