JP2581476B2 - Information processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus, and more particularly, to TELNE of TCP / IP (Transmission Control Protocol / Internet Protocol) procedure.
The present invention relates to a client / server and a server / client type information processing device that performs online processing with a partner device using a T protocol.

[0002]

2. Description of the Related Art Conventionally, in general UNIX, TELN
The login process is above the ET server, TELNE
A user exists above the T client, and a TCP exists below the TELNET. The user here is TELN
Refers to a user of the ET and an application program in the device or an operator of the device.

[0003] When the own device is a client, TELNE
T accepts an OPEN command from the user and establishes a connection. The user transmits and receives data using the connection. Connection is disconnected at logout. Alternatively, the user is logged out when the connection is disconnected due to some failure. Again TELNET
In order to perform data transfer using
An N command must be issued to establish a connection.

When the own device is a server, TELNET always performs a LISTEN on a WELL KNOWN port, and generates a login process when a connection is established from a partner device. Normally, the connection establishment from the partner device is performed by the user of the partner device by the TELNET of the partner device.
This is performed when an OPEN command is issued to the client. The login process transmits and receives data using the connection.

[0005] At the time of logout, the connection is disconnected.
Alternatively, if the user is logged out when the connection is disconnected due to some failure, the login process is deleted. In order to transfer data again using TELNET, the partner user must issue an OPEN command and establish a connection.

Another conventional example is disclosed in Japanese Patent Application Laid-Open No. 5-346.
No. 898 discloses an example of a TCP / IP-based client / server system that establishes a connection between a client and a server and performs data communication through this connection, and FIG. 19 is a schematic block diagram thereof. ing.

In this system, the client 1 and the server 2 use UNIX as an operating system, and use TCP / IP as the third and fourth layers of the OSI reference model, and use Ethernet or the like as the first and second layers. And are connected via a transmission line 3.

[0008] The client 1 transmits and receives data via the connection, detects an error during transmission and reception, when a cable or the like is connected, detects connection close processing on the server 2 side, and issues a connection close instruction and a connection establishment request output. Data transmission / reception processing unit 11 for giving instructions
A connection establishment requesting unit 12 that continuously transmits a connection establishment request to the server 2 until a connection is established according to an instruction from the data transmission / reception processing unit 11, and a connection control that closes the connection according to an instruction from the data transmission / reception processing unit 11. Unit 13 in the TCP layer.

The server 2 performs data transmission and reception via a connection in the same manner as the data transmission / reception processing unit 11, and
A data transmission / reception processing unit 21 that detects a connection close process on the client 1 side and issues a connection close instruction and a connection establishment request output instruction when a transmission / reception error or a cable or the like is connected, and a connection establishment request unit of the client 1 A connection establishment passive unit 22 for performing a connection establishment process in response to a request from
The connection established by the connection passive unit 22 is authenticated, and the process control unit 23 that closes the old connection (process) and the connection control unit 24 that closes the connection according to an instruction from the data transmission / reception processing unit 23 are TCP. Have in layers.

[0010] Thereby, between the client 1 and the server 2, a connection communication type transmission mode, that is, each TCP at both ends of the connection established by the socket interface.
Data communication is performed via a port (communication port).

In this example, when an error occurs during data transmission / reception between the client and the server, the data transmission / reception processing unit 11 detects the error and causes the connection control unit 13 to close the connection and the connection establishment request unit 12 to newly notify the connection establishment request unit 12. It keeps outputting the connection establishment request until a proper connection is established.

On the server side, the data transmission / reception processing unit 21 detects the connection closing process on the client side, and sends instructions to the connection establishment passive unit 22 and the connection control unit 24, and the connection control unit 24 closes the connection. The connection passive unit 22 always waits for a connection establishment request.

By doing so, when an error occurs during communication, a connection establishment request is automatically output and a new connection is established, thereby enabling automatic connection restoration.

[0014]

In the prior art described above, the user of the own device and the user of the other device must perform processing on the assumption that a connection exists. That is, it is necessary to start the process when the connection is established and to end the process when the connection is disconnected, and there is a problem that the degree of freedom of the process is low.

[0015] Further, since the user of the own apparatus and the other apparatus must manage the connection and perform operations of establishing and disconnecting the connection, there is a problem that the processing of the user becomes complicated.

When the connection is disconnected due to some kind of failure, the processing of the user of the own apparatus and the processing of the other apparatus are terminated at that point, and to resume the processing from the point where the processing was interrupted, one of the user's own processing is again performed. TELN of equipment
An OPEN command must be issued to the ET to establish a connection. Then, it is necessary to investigate where the processing has been terminated, and if necessary, perform a recovery processing, which causes a problem that it takes time and effort.

In the client / server system disclosed in Japanese Patent Laid-Open No. 5-346985, when an error occurs during communication, the connection is closed, a new connection request is generated, and the connection is established. Although the process of managing the connection by the user is not complicated, the operation is performed on the premise of the connection. Instead, the process is terminated when the connection is disconnected. There is a problem similar to the conventional example.

An object of the present invention is to improve the simplicity of processing and simplify and speed up the recovery from a line failure without assuming a connection when performing data transfer using TELNET by an application program. An object of the present invention is to provide an information processing device that can be designed.

[0019]

According to the present invention, a TCP is provided.
Client / server, server / client type information processing apparatus that performs online processing with a partner apparatus using the TELNET protocol of the / IP procedure,
A terminal-oriented application program, definition information storage means for storing definition information relating to all partner devices for which the device itself performs online processing, and a data transmission request to the partner device in response to a data transmission request from the application program. A data transmitting unit, a data receiving unit for receiving a data reception request from the application program and notifying the application program of data received from a partner device, and transmitting data from the application program when the own device is a client. A client connection establishing means for establishing a connection in response to the definition information in response to a request and a data reception request, and a server connector for establishing a connection in response to a connection establishment request from a partner device when the own device is a server And ® down establishing means, the information processing apparatus is obtained which comprises a fault notifying means for notifying the application program as a line fault by detecting Konekushoku cutting, the.

[0020]

The terminal-oriented application program in the own device simply issues a data transmission request and a data reception request with the partner device, and the connection management based on these data transmission / reception requests is performed by the connection management unit. In this way, the application program does not need to assume the establishment of a connection, but only needs to support operations that require only data transmission / reception, and since it does not assume a connection, data transfer cannot be performed regardless of the presence or absence of a connection. Can notify the application program in the form of a line failure, which greatly simplifies the creation and management of the application program.

[0021]

Next, an embodiment of the information processing apparatus of the present invention will be described with reference to the drawings.

Referring to FIG. 1, an information processing apparatus 200 according to an embodiment of the present invention has the following functional units. That is, definition information 260 about all partner devices,
An application program management unit 210 that receives a data transmission request and a data reception request from the terminal-oriented application program 110 and notifies the application program 110 of received data and a line failure. Connection management unit 220 for establishing a connection between
And a data transfer unit 230 that transmits and receives data to and from the partner device using the TELNET server 130 and the TELNET client 140, a user management unit 240 that receives a command from the user 120, and definition information 260. And a definition information management unit 250 that changes the

Further, the entire apparatus 100 includes an application program 110, a user 120, and a TELNE.
T server 130 and TELNET client 140
, TCP / IP processing section 150, information processing apparatus 200
It is comprised including. This own device 100 is usually L
It is connected to a line 300 that is an AN. User 12
0 is an application program or an operator of the apparatus itself.

Referring to FIG. 2A, definition information 260
Is defined in a line for each connection expected to be used in advance, and the destination device name 261 specified by the application program, the destination device address information 262,
The information includes device information 263, a timer value 264 for monitoring the time of a non-communication state, selection information 265 for establishing a client connection, and the like. A plurality of rows may be defined for the same partner device.

Referring to FIG. 2B, device information 263
Includes the terminal type name of TELNET, the type of whether the device is a client or a server, the type of TELNET option that can be used with the partner device, and the like. In addition, the login information may include a user name, a password, and the like.

Referring to FIG. 2C, selection information 265
There are four types, which indicate whether a client connection is established or not at the time of data transmission request and data reception request, respectively. Normally 0 is not specified.

Referring to FIGS. 3A and 3B, the TELNET client 140 of the own device 100 transmits and receives TELNET data to and from the TELNET server of the other device 400, and the TELNET server 130 transmits the TELNET data to the TELNET server.
TELNET data is transmitted to and received from the NET client 420. TELNET server 410 and TEL
The NET client 420 is connected to the TELNET server 13
0 and TELNET client 140 need not be the same. Further, the partner device 400 does not need to mount the information processing device 200.

Next, the operation of the embodiment of the information processing apparatus of the present invention will be described with reference to the drawings.

Referring to FIG. 4, the application program management section 210 executes the application program 1
10 is received. Then, the non-communication monitoring timer corresponding to the device name 261 is set to the timer value 264.
To reset. Then, the transmission request is passed to the connection management unit 220. The data transmission request is composed of the partner device name 261 and data to be transmitted. Further, the all-no-communications monitoring timer corresponding to all partner device names 261 starts with a timer value 264 when the information processing device 200 is started.

Referring to FIG. 5, the application program management section 210 stores the application program 1
10, a data reception request is received. Then, the non-communication monitoring timer corresponding to the device name 261 is reset with the timer value 264. Then, the reception request is passed to the connection management unit 220. The data reception request is composed of the partner device name 261.

Referring to FIG. 6, application program management section 210 receives data received from data transfer section 230. Then, it notifies the application program 110 of the received data.

Referring to FIG. 7, application program management section 210 receives a line fault from connection management section 220. Then, if there is an application program 110 registered in a FIFO queue to be described later, a transmission failure is notified to the corresponding partner device. Further, if there is an application program 110 registered in a FIFO queue, which will be described later, a reception failure is notified to the corresponding partner device. If there is no application program 110 to be notified of the failure, nothing is performed.

Referring to FIG. 8, connection management unit 2
20 receives a data transmission request from the application program management unit 210. Then, the device name 26
If there is already a connection between one partner device, it transmits a transmission request to the data transfer unit 230. If there is no connection and a server is specified in the device information 263, the application program management unit is notified of the line failure of the device.

If the client is designated and the number 0 or 2 is designated in the selection information 265, the application program management unit is notified of the line failure of the device. If No. 1 or No. 3 is designated, the transmission request is temporarily registered in the FIFO queue. Then, in accordance with the definition information 260, a connection is established using the TELNET client 140.

Referring to FIG. 9, the connection management unit 2
20 receives a data reception request from the application program management unit 210. Then, the device name 26
If a connection has already been established between one partner device, a server has been specified in the device information 263, or a number 0 or 1 has been specified in the selection information 265, a reception request is received by the data transfer unit 230. hand over.

If there is no connection and the client is specified, and if the number 2 or 3 is specified in the selection information 265, the reception request is temporarily registered in the FIFO queue. Then, according to the definition information 260, TELNET
The connection is established using the client 140.

Unlike the data transmission request described with reference to FIG. 8, a data reception request does not cause a line failure even if data transfer is not possible. This is because the data transmission occurs by the operation of the own device, but the data reception occurs by the operation of the partner device. That is, from the viewpoint of the application program, the process is the same regardless of whether data transfer is possible or not, unless data arrives from the partner device.

Referring to FIG. 10, when connection establishment is requested from the partner device, the connection management unit 220 according to the definition information 260, the TELNET server 130
Use to establish a connection.

Referring to FIG. 11, when a connection with the partner device is established, connection management section 220 takes out a data transmission request from the FIFO queue described with reference to FIG. Then, the transmission request is transferred to the data transfer unit 230.

The data reception request is taken out of the FIFO queue described with reference to FIG. Then, the data transfer unit 2
The reception request is passed to 30. These are repeated until both queues are empty.

Referring to FIG. 12, when the connection with the partner device is disconnected or when the connection establishment fails, the connection management unit 220 registers the connection in the FIFO queue of the device described in FIG. Discard all data transmission requests. Also, all the data reception requests registered in the queue described with reference to FIG. 9 are discarded. Also, all data transmission requests registered by the data transfer unit described later with reference to FIG. 14 are discarded. Also, all data reception requests registered by the data transfer unit described later with reference to FIG. 15 are discarded.

Then, the application program management unit is notified of the line failure of the device.

Referring to FIG. 13, when the non-communication monitoring timer described in FIG. 4 times out a predetermined period of time, the connection management unit 220, if there is a connection with the device, the TELNET server 130,
Or, using the TELNET client 140,
Disconnect the connection.

Referring to FIG. 14, data transfer unit 230
Registers the data transmission request passed from the application program management unit in a queue indicating that data is being transmitted. Then, the TELNET server 130 or
The TELNET client 140 is used to transmit data to the partner device. When the transmission is completed, the transmission request is deleted from the queue.

Referring to FIG. 15, data transfer unit 230
Registers the data reception request passed from the application program management unit in a queue indicating that data is being received.

Referring to FIG. 16, data transfer unit 230
Is the TELNET server 130 or TELNET
When notified of data reception from the client 140,
If a data reception request is registered in the FIFO queue described with reference to FIG. 15 for the device name 261 corresponding to the connection, the reception request is deleted. Then, the application program management unit 210 is notified of the data reception of the application program 110. If the data reception request has not been registered, the received data is discarded.

Referring to FIG. 17, user management unit 240
Receives a command for the own device from the user.
If the command is a request to change the selection information 265, the command is passed to the definition information management unit 250.

Referring to FIG. 18, definition information management unit 25
When the command is passed from the user management unit 240 to 0, the process is performed only when the device information 263 of the designated partner device is a client. First, the selection information 265 is changed according to the designation of the command. If there is no connection with the device and the selection information 265 is changed to the second or third, the application program management unit is notified of the line failure of the device.

[0049]

As is apparent from the above description, according to the present invention, an application program that transmits and receives data to and from a partner device using TELNET does not need to perform a connection establishment operation.
Therefore, in order to perform data transfer, only two types of operations, a data transmission request and a data reception request, need to be supported. And, regardless of the presence or absence of a connection,
Since the impossibility of data transfer is reported in the form of a line failure, it becomes very easy to create an application program.

When the own device is a client,
The connection is not established unless the application program issues a data transfer operation.

Further, since the application program monitors the non-communication time during which no data transfer operation is performed and disconnects unnecessary connections, the resources of the own device can be effectively used.

Further, since the application program can operate without assuming the existence of the connection, even if the connection is disconnected due to a line failure or the like,
Processing continuity can be maintained.

When the device is a client, the connection is automatically re-established when the application program issues a data transfer operation, so that recovery from a failure can be performed very quickly and easily. .

Furthermore, if the partner device also implements the information processing device of the present invention, it is possible to construct a fully automatic failure recovery system that does not require human intervention.

If the own device is a client, the establishment of the connection is stopped according to the selection information. Further, since the selection information can be dynamically changed, it is possible to prevent a loop of the application program such as a failure in connection establishment or a re-establishment.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an embodiment of an information processing apparatus according to the present invention.

FIG. 2A is a diagram illustrating an example of definition information regarding a partner device according to an embodiment of the present invention; FIG. 2B is a diagram illustrating an example of device information in definition information regarding a partner device according to an embodiment of the present invention; FIG. 7C is a diagram illustrating an example of selection information in the definition information regarding the partner device according to an embodiment of the present invention.

FIG. 3 is a diagram showing an outline of data transfer in one embodiment of the present invention.

FIG. 4 is a flowchart of a data transmission request operation of an application program management unit in one embodiment of the present invention.

FIG. 5 is a flowchart of a data reception request operation of an application program management unit in one embodiment of the present invention.

FIG. 6 is a flowchart of a data reception notifying operation of an application program management unit in one embodiment of the present invention.

FIG. 7 is a flowchart of a line failure notification operation of an application program management unit in one embodiment of the present invention.

FIG. 8 is a flowchart of a data transmission request operation of a connection management unit in one embodiment of the present invention.

FIG. 9 is a flowchart of a data reception request operation of a connection management unit in one embodiment of the present invention.

FIG. 10 is a flowchart of a connection establishment start operation of the server of the connection management unit in one embodiment of the present invention.

FIG. 11 is a flowchart of a connection establishment completion operation of a connection management unit in one embodiment of the present invention.

FIG. 12 is a flowchart of a connection disconnection completion operation of a connection management unit according to an embodiment of the present invention.

FIG. 13 is a flowchart of a connection disconnection start operation of the connection management unit in one embodiment of the present invention.

FIG. 14 is a flowchart of a data transmission request operation of the data transfer unit in one embodiment of the present invention.

FIG. 15 is a flowchart of a data reception request operation of the data transfer unit in one embodiment of the present invention.

FIG. 16 is a flowchart of a data reception notifying operation of the data transfer unit in one embodiment of the present invention.

FIG. 17 is a flowchart of a command receiving operation of a user management unit according to an embodiment of the present invention.

FIG. 18 is a flowchart of a command receiving operation of a definition information management unit according to an embodiment of the present invention.

FIG. 19 is a block diagram showing an example of a conventional TCP / IP client and server system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Overall device 110 Application program 120 User 130 TELNET server (own device) 140 TELNET client (own device) 150 TCP / IP processing unit 200 Information processing device 210 Application program management unit 220 Connection management unit 230 Data transfer unit 240 User management unit 250 definition information management unit 260 definition information 261 device name 262 address information 263 device information 264 no-communication monitoring timer value 265 selection information 300 line 400 partner device 410 TELNET server (partner device) 420 TELNET client (partner device)

Claims (3)

(57) [Claims] 1. A client / server or server / client type information processing apparatus which performs online processing with a partner apparatus using a TELNET protocol of a TCP / IP procedure, comprising: a terminal-oriented application program; Definition information storage means for storing definition information relating to all the partner apparatuses for which the apparatus itself performs online processing, data transmission means for receiving a data transmission request from the application program and transmitting data to the partner apparatus, and the application program And a data receiving means for notifying the application program of data received from the partner device in response to a data reception request from the device, and responding to a data transmission request and a data reception request from the application program when the own device is a client. Defined above Client connection establishment means that establishes a connection in response to a report, server connection establishment means that establishes a connection in response to a connection establishment request from the partner device when the own device is a server, and line failure by detecting disconnection of a connection And a failure notifying unit for notifying the application program. 2. A counting means for counting a non-communication time during which the application program does not issue a data communication request or a data reception request to a partner device, and when the counting means counts a predetermined time, 2. The information processing apparatus according to claim 1, further comprising connection disconnection means for disconnecting the connection. 3. The apparatus according to claim 1, further comprising definition information management means capable of changing the definition information in response to an external command, wherein the definition information for establishing the connection is changeable. 3. The information processing apparatus according to 1 or 2.