JPH05173908A - Multihost access system - Google Patents

Abstract

PURPOSE:To simultaneously access plural computers different in protocols by providing a terminal computer with a protocol control means and a conversion module mechanism part. CONSTITUTION:In a terminal computer 1, a line control part 16 which controls a communication line is provided with a protocol control mechanism part 18 which simultaneously discriminates plural communication protocols and gathers and distributes data from and to higher and same orders by delivery to each address and the request from the address. The computer 1 is provided with a conversion module mechanism part 14 which performs data transmission/ reception between each address and each application of the terminal side and intervenes in session opening to computers 2 to 4 of the other party and data transmission/reception. Thus, plural computers of the other party which are operated by different protocols can be freely used without paying an attention to the protocol difference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-host access system, and more particularly to a multi-host access system for simultaneous communication with a plurality of parties in a computer application field.

[0002]

2. Description of the Related Art Conventionally, in data communication between computers via a LAN or the like, a host computer often has a plurality of simultaneous data communication functions. However, a personal computer as a terminal is mainly one in which an operating system (hereinafter referred to as OS) can perform only one process at a time (hereinafter referred to as single task),
Along with this, since only one protocol is prepared for the line control part that is responsible for the data communication function, when data is transmitted / received to / from another terminal device or a host computer, one partner at a time. Or, only communication regarding the same protocol can be performed.

[0003]

In this conventional line control unit on the terminal, the number of protocols that can be transmitted by the protocol transmission / reception unit is physically one at a time, and the physical address for receiving this is also present. Only one protocol can be controlled at the line control part, but due to the recent multi-vendor orientation, the terminal side does not have to be aware of the communication protocol of the other party, and can simultaneously manage multiple peers or higher ranks. It seems that there is a demand to be able to access, but there is a problem that this cannot be done by the current access method on the terminal side.

In view of the above problems, the present invention provides a multi-host access system in which a plurality of computers operating under different protocols can freely use a partner computer without being aware of the difference in the protocols. To aim.

[0005]

The multi-host access method of the present invention is a multi-host access method for a terminal computer connected via a communication line to a plurality of computers operating according to different protocols, wherein the terminal computer is , A protocol control means for simultaneously discriminating a plurality of communication protocols to a part for controlling a communication line, and delivering and delivering data to each address and requesting from each address to a higher rank and a peer, and each address. It has a conversion module mechanism unit that exchanges data with each application on the terminal side and mediates session opening and data exchange with a partner computer.

[0006]

The protocol control mechanism unit of the terminal computer determines the protocol of each partner computer, and the conversion module mechanism unit connects to the protocol of the terminal computer in accordance with the determined protocol. Therefore, the terminal computer can send and receive data to and from the other computer without being aware of the difference in protocol.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the multi-host access system of the present invention.

The personal computer 1 is connected to another personal computer 2 and a plurality of host computers 3, 4, ... Through a network 5. The personal computer 1 and the host computers 3 and 4 are provided with distributed databases 21, 31, and 41, respectively. The computers 2, 3 and 4 operate under mutually different communication protocols.

In the personal computer 1,
In order to perform processing with a plurality of computers at the same time, an application software section 12 having a multitask OS section 11 and performing data communication processing with other computers operates on the multitask OS section 11. In the line control unit 16 that carries out actual communication, a protocol transmission / reception unit 19 that physically transmits and receives a communication protocol, and a multi-protocol that simultaneously performs identification and distribution for a plurality of communication protocols in both transmission and reception units bidirectionally. It includes a control mechanism 18 and an address holding unit 17 that holds a physical address corresponding to a communication partner. In the process of processing by the application software unit 12 from the personal computer 1 on the terminal side, data may be distributed to a plurality of other computers. In this case, in the communication software unit 13, the multi-protocol control mechanism unit 18 makes the computer 2, which is the partner of the access request,
3, 4 and others (hereinafter referred to as "others" are omitted) are identified, conversion sessions necessary for data communication access such as opening a session with each computer are performed,
It is delivered to the protocol communication software unit 15. After that, the access request enters from the conversion module mechanism 14 to each communication protocol software of the protocol communication software unit 15 and enters the line control unit 16.

In the line control unit 16, the address of each destination is divided into a physical address 17, and the multi-protocol control mechanism 18 simultaneously delivers the data to the computers 2, 3 and 4.

Next, the case where data is simultaneously received from the computers 2, 3 and 4 having a plurality of different communication protocols will be described.

The data received by the protocol transmission / reception unit 19 of the personal computer 1 is simultaneously discriminated by the multi-protocol control mechanism unit 18 from the detection of the respective destinations, and the address holding unit 17 is provided.
Of the application software unit 12 to be delivered by the conversion module mechanism 14 through the protocol communication software unit 15 and performs data conversion necessary for delivery and the like to the application software unit 12. Passed.

The above two examples can be similarly performed even when bidirectional communication occurs simultaneously.

Next, the distributed databases 21, 31, 41
A specific example of conversation processing such as data search from a plurality of files and data update will be described.

When executing a data search for the distributed databases 21, 31, 41 existing in a distributed manner on the computers 2, 3, 4 during the processing of the application software unit 12, the application software unit 12 uses the distributed database. When the computers 2, 3, and 4 including 21, 31, and 41 are designated and the transmission key is pressed, a file open request and an access request are issued.

This request is passed to the conversion module mechanism 14, and the address, communication protocol identifier, etc. for each computer are given. Next, the protocol communication software unit 15 puts it on each communication protocol procedure using the communication protocol identifier and delivers it to the line control unit 16. Here, the file open / access request enters the physical address of the address holding unit 17 for each assigned address, and is physically opened on a plurality of protocols on the multi-protocol control mechanism unit 18. Of each computer at the same time.
After being transmitted to 3 and 4, the file open and the access request are received by the other party, the personal computer 1 further transmits the search condition of the database and the like.

Reception of data search results from the distributed databases 21, 31, 41 on the computers 2, 3, 4;
In addition, the same procedure is performed when updating the data from the personal computer 1 side, and it becomes possible to access the data that are actually physically distributed as one database.

[0018]

As described above, the present invention recognizes a multi-protocol control mechanism for simultaneously controlling a plurality of protocols and a partner on a personal computer used as a terminal when a computer having a plurality of communication protocols exists. , By providing a conversion module mechanism for adding data for communication, it is possible to access a computer having a plurality of different protocols at the same time.

As a result, it is possible to construct a distributed database without selecting the other party in terms of hardware, regardless of the method of the distributed database or the like currently supported by the same model or the software portion of each database. Furthermore, by using this method, there is an effect that it can be applied to the construction of application software in a wide variety of fields in a multi-vendor environment or the like.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a multi-host access system.

[Explanation of symbols]

 1, 2 Personal Computer 3, 4 Host Computer 5 Network 11 Multitask OS Section 12 Application Software Section 13 Communication Software Section 14 Conversion Module Mechanism Section 15 Protocol Communication Software Section 16 Line Control Section 17 Address Holding Section 18 Multiprotocol Control Mechanism Section 19 Protocol transmitter / receiver 21, 31, 41 Distributed database

Claims (1)

[Claims] 1. A multi-host access method of a terminal computer connected to a plurality of computers operating according to different protocols via a communication line, wherein the terminal computer is a part that controls the communication line,
Protocol control means for simultaneously discriminating a plurality of communication protocols, delivering and delivering to each address assigned to each communication protocol, and requesting from each address, data collection and distribution to upper and peer peers, each address and terminal A multi-host access method, comprising: a conversion module mechanism unit for transmitting and receiving data to and from each application on the side, and for mediating session establishment and data transmission and reception for a partner computer.