KR20010028500A - Multi-Access Module And Method In TCP/IP Server/Client - Google Patents

Abstract

PURPOSE: A multiple connection module of a TCP/IP server/client and a method are provided to prevent waste of system resources in the connection with relevant multiple server or multiple client by processing a connection with the multiple sever or the multiple client through each link. CONSTITUTION: A multiple server connection unit(10) of relevant client module watches a trial and a state of the connection with a server relevant to each link. Data collection processing unit(20) collects data inputted from each server through the multiple server connection unit(10), and transmits the data to an application processing unit(40). The data transmission processing unit(30) transmits the data received from the application processing unit(40) to relevant server through the multiple server connection unit(10).

Description

Multi-Access Module And Method In TCP / IP Server / Client}

The present invention relates to multiple access modules and methods of a TCP / IP server / client, and in particular, to handle multiple server or multiple client connections for each link for TCP / IP multiple access, and to collect and transmit data over the link. A multi-access module and method of a TCP / IP server / client to perform in a limited process.

In general, a server / client that performs transmission control protocol / internet protocol (TCP / IP) protocol processing includes a TCP / IP connection, which is a child process when a client requests a connection. Alternatively, a thread is created to process messages from each client, and the corresponding client creates a separate client process for each server to process messages from that server.

That is, the conventional TCP / IP server / client has a server connection processing unit 51 for monitoring whether a client is connected, and a child processor or thread generated for each client by the server connection processing unit 51 when the client is connected. It is composed of a plurality of client processing unit and a plurality of client processes to generate one for each server as a processor for connecting to the server from the client.

Referring to the operation of the conventional TCP / IP server / client configured as described above, in the case of the server, the server connection processing unit 51 monitors the connection of the external client, and when a connection is made with the client, the child for processing the client. After creating a process, the child process performs a message processing with the corresponding client, and simultaneously monitors the connection of another external client to perform the repeated operation.

In the case of a client, a client process is created to connect to a desired server and attempts to connect to the server. When the connection is established, the client processes a message with the corresponding server. Will be created.

As described above, in the conventional TCP / IP server / client, since a separate process is required for accessing and processing messages with a plurality of external clients or servers, there is a difficulty in managing a plurality of processes, and communication between each process. There was a problem that resources for wasted.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object thereof is to use a TCP / IP multiple access module, which is a limited process module separate from an application processing unit, to collect and process data and multiple server or multiple client access through each link. By performing the transmission process, it is possible to prevent system resource wasted when connecting to the multiple server or multiple clients, and to easily perform the connection and management of each link and the management of the corresponding process module.

1A is a diagram illustrating a multiple access module of a TCP / IP client according to the present invention, and (B) is a diagram illustrating a multiple access module of a TCP / IP server.

2 is a flow diagram of a multi-server connection operation of a client module in accordance with the present invention.

3 is a flowchart illustrating a data transmission processing operation of a client module and a server module according to the present invention.

4 is a flow chart of multiple client access and data collection processing operations of a server module in accordance with the present invention.

5 is a flowchart illustrating a multiple access operation of a TCP / IP server / client according to the present invention.

Explanation of symbols on the main parts of the drawings

10: multiple server connection unit 11: access control unit

12: connection monitoring unit 20, 52: data collection processing unit

30, 60: data transfer processing unit 40, 70: application processing unit

50: multiple client connection unit 51: connection processing unit

A feature of the present invention for achieving the above object is a client module for attempting to connect to a server corresponding to each link, and performing data collection and transmission processing for multiple servers through each connected link; It includes a server module for processing a link connection to the client required to connect through each link, and performs data collection and transmission processing for multiple clients through each connected link.

Here, the client module includes a multi-server connection unit for monitoring a connection attempt and a connection state with a server corresponding to each link; A data collection processing unit for collecting data inputted through the multi-server connection unit from each server and transferring the data to a corresponding application processing unit in a packet form; And a data transmission processor for transmitting the data transmitted from the application processor to the corresponding server side through the multi-server connection unit.

The multi-server connection unit attempts to connect to the server through each link, but checks whether each link is connected through an event flag or a message queue, and attempts to reconnect at regular intervals when the connection fails. And a connection monitoring unit that monitors the connection state of each link and controls the connection control unit to retry the link connection when the connection is disconnected or a link failure is reported from the link test process. Link failure or exception processing that occurs while transmitting data transmitted from an application processing unit to a corresponding server side is reported to the multi-server connection unit by using an event flag or a message queue to retry the link connection.

On the other hand, the server module comprises a multi-client connection unit for processing the link connection to the client that is requested to connect through each link and at the same time to collect data on the client side input through each link; And a data transmission processor for transmitting data transmitted from an application processor to the corresponding client side through the multi-client connection unit, wherein the multi-client connection unit accepts a link connection to a client requesting connection through each link. A connection processing unit for constructing new socket and link information; The method may further include a data collection processor configured to collect data of the client side input through the link connected by the connection processor and transmit the data to the application processor in the form of a packet.

Another aspect of the present invention provides a TCP / IP server / client multiple access method, comprising: performing a multi-server connection by attempting connection with a server through each link; Constructing socket and link information for each link attempted to perform multiple client accesses; It includes the process of performing the data transmission process with the partner server or client through each connected link.

Here, the process of performing the multi-server connection may include: attempting to connect to the server through each link; Checking whether a connection attempted link is connected and retrying a link connection when the connection fails; Monitoring the connected link status to determine if the connection is down or a link failure is reported; The method may further include retrying a connection for a link in which a connection is disconnected or a link failure is reported. The process of performing the multi-client connection may include a client connection request attempted to connect through each link using a selection statement. Accepting and configuring corresponding socket and link information; Collecting client data transmitted over each currently connected link; The method may further include configuring the collected data in a packet form and transferring the collected data to an application processing unit through a message queue.

The process of performing data transmission through each link may include: checking whether a link connected to a server or a client to which data received from an application processor is to be transmitted is activated; If the link is activated, further comprising the step of transmitting the data to the partner server or the client side through the activated link, in the step of confirming whether the link is activated, if the link is not activated Retrying the link connection a predetermined number of times; Transmitting the data to the counterpart server or the client when the retry link is normally connected; And discarding the data if the retry link is not normally connected.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the TCP / IP server / client multiple access module according to the present invention, as shown in (a) and (b) of FIG. 1, the multiple server connection unit 10, the data collection processing unit 20, and data transmission. The client module includes a processing unit 30 and an application processing unit 40, and a server module including a multiple client connection unit 50, a data transmission processing unit 60, and an application processing unit 70, and the application processing unit 40. (70) performs processing independent of TCP / IP multiple access processing.

The multi-server connection unit 10 of the client module monitors connection attempts and connection states with the corresponding server for each link, and the data collection processing unit 20 receives data input through the multi-server connection unit 10 from each server. The packet is collected and transmitted to the application processor 40 in the form of a packet, and the data transmission processor 30 transmits the data transmitted from the application processor 40 to the corresponding server through the multiple server connection unit 10.

Here, the multi-server connection unit 10 attempts to connect to the server through each link, but checks whether each link is connected through an event flag or a message queue, and attempts to reconnect at a predetermined period when the connection fails. 11) and a connection monitoring unit 12 which monitors the connection state of each link and informs the connection control unit 11 of the case where the corresponding connection is disconnected or a link failure is reported from the link test process to retry the connection. .

The data transmission processor 30 transmits the data transmitted from the application processor 40 to the corresponding server by using an event flag or a message queue to perform link failure or exception processing. Report to the connection monitoring unit 12 to retry the connection.

On the other hand, the multi-client connection unit 50 of the server module handles the link connection to the client that is requested to connect through each link and at the same time collects data on the client side input through each link, the data transmission processing unit 60 Transmits the data transmitted from the application processing unit 70 to the corresponding client side through the multi-client connection unit 50.

In addition, the multi-client connection unit 50 accepts a link connection to a client that is requested to connect through each link, and establishes a new socket and link information (address information of the client connected through the link, TCP connection port information, and the like. Connection processing unit 51 constituting connection state information), and a data collection processing unit 52 which collects data on the client side input through a link processed by the connection processing unit 51 and delivers the data to the application processing unit in the form of a packet. More). Here, the first socket is used for accepting a server, and when configuring a server with a plurality of different ports, a plurality of sockets used for accepting must be configured, and the descriptor of the accepted socket ( Descriptor) is stored in the link information and is referred to at the time of data transmission.

The TCP / IP multiple access operation by the multiple access module of the TCP / IP server / client according to the present invention configured as described above is as follows.

First, referring to FIG. 2 to which the multi-server connection operation of the client module is attached, after the connection control unit 11 of the multi-server connection unit 10 attempts to connect to the server via a predetermined link ( Step S21), it is checked whether the corresponding link is connected using the event flag or the message queue (step S22). At this time, if the link is connected to the server, the link monitoring unit 12 reports the link status to the connection monitoring unit 12. If the link is not connected to the server, the connection with the server via the link is retried every predetermined period (step S24).

Then, whether the current connection is disconnected due to a connection failure or a link failure is reported from the link test processor (step S25), when the connection of the corresponding link is disconnected or a link failure is reported, the corresponding multi-server connection 10 The connection monitoring unit 12 controls the connection control unit 11 to retry the connection to the link in which the connection is disconnected or a link failure is reported (step S23), and then returns to step S22 for checking whether the link is connected. The repetitive operation will be performed.

By the way, when the connection of the currently connected link is not disconnected or the link failure is not reported in step S25, that is, when the link is normally activated, the connection control unit 11 of the multi-server connection unit 10 returns to step S21. By performing an iterative operation, it is possible to process multiple server accesses connecting different servers for each link.

Second, the data transmission processing operations of the client module and the server module will be described with reference to FIG. 3.

First, when the application processor 40 or 70 of each module transmits predetermined data to be transmitted to a predetermined server or client to the data transmission processor 30 or 60 through a message queue, the corresponding data transmission processor 30 or 60 is transmitted. Checks whether the link connected to the server or client to which the received data is to be transmitted is activated, i.e., if the socket for the link is properly configured (steps S31 and S32), the link to which the data should be transmitted is activated. If so, the data transmitted from the corresponding application processing unit 40, 70 is transmitted to the counterpart server or the client side through the activated link (step S33).

By the way, when the link to which the data is to be transmitted is not activated in step S32, the data transmission processing unit 30, 60 reports this to the multi-server connection unit 10 or the multi-client connection unit 50, a predetermined number of times. The link connection is retried (step S34).

Thereafter, the data transmission processing unit 30, 60 checks whether the link which retries the connection is normally connected (step S35), and if the link is normally connected, the data received from the application processing unit 40, 70 is linked. The data is transmitted to the counterpart server or the client side via step S33. If the link is not normally connected, the data received from the application processing units 40 and 70 is discarded (step S36).

The data transmission processor 30 of the client module transmits data to the counterpart server through a predetermined link, and uses an event flag or a message queue when an error occurs on the link or an exception occurs while the socket is in use. By reporting this to the connection control unit 11 of the multi-server connection unit 10 to retry the connection to the link.

Third, with reference to the accompanying drawings of the multi-client connection and data collection processing operation of the server module, when a connection request to the client is transmitted to the multi-client connection unit 50 through a predetermined link (step S41). Then, the connection processing unit 51 of the multi-client connection unit 50 accepts the connection request from the client and configures the corresponding socket and link information (step S42).

Then, the data collection processing unit 52 of the multi-client connection unit 50 collects data transmitted from the corresponding client through each link currently connected (step S43), and configures the packet form for each link. The message is transmitted to the application processing unit 70 through the message queue (step S44). At this time, the multi-client connection unit 50 uses a SELECT statement to perform client connection request processing and data collection processing through each link. Will be performed.

Referring to Figure 5 attached to the multi-connection operation of the above-described TCP / IP server / client as follows.

First, when a connection request from an external client is input to the connection processing unit 51 through a predetermined link, the multiple connection module of the server processes the client connection to the link in the connection processing unit 51 and then performs the connection processing. The completion is reported to the data transfer processing unit 60.

Then, the data transmission processing unit 60 reports the completion of the connection processing by the connection processing unit 51 to the external client requesting the connection. Accordingly, when data is transmitted through the link connected from the external client, the data is transmitted. The collection processing unit 52 collects and performs a corresponding process through the application processing unit 70, and the data from the application processing unit 70 is transmitted to an external client through a link connected by the data transmission processing unit 60. do.

Next, the multi-access module of the client requests the connection to the external server through the predetermined link in the connection control unit 11, and when the completion of the connection is reported from the external server, the data collection processing unit 20 and data transmission Report to the processor 30.

Subsequently, when the application processor 40 of the client wishes to transmit predetermined data to the external server, the data transmission processor 30 transmits the data of the application processor 40 to the external server through the connected link. Accordingly, the data transmitted from the corresponding external server is collected by the data collection processing unit 20 and transferred to the corresponding application processing unit 40.

On the other hand, in the present invention, the data collected by the data collection processing unit 20, 52 is transmitted and processed in a separate process consisting of a message processing unit (not shown in the figure), the link for monitoring the status of each link The status monitoring unit (not shown in the drawing) is composed of one process, and determines whether there is an abnormality in each link and reports it to the connection control unit 11 of the corresponding client module, thereby retrying the link connection or executing an error processing routine. Will be performed.

In addition, since the link is composed of a bit pattern, data can be transmitted to multiple servers or clients at the same time in redundancy or multiplexing, and the link state is applied by using functions or global variables in the application processing units 40 and 70 of each module. You can also set to process by checking.

As described above, the TCP / IP server / client according to the present invention constitutes a module for TCP / IP multiple access processing separated from the application processing units 40 and 70, thereby link link processing related to the corresponding TCP / IP multiple access and By performing management, it is possible to perform connections of multiple servers or multiple clients by limited process modules.

In addition, the embodiments according to the present invention are not limited to the above-described embodiments, and various alternatives, modifications, and changes can be made within the scope apparent to those skilled in the art.

As described above, the present invention uses the TCP / IP multiple access module, which is a limited process module separate from the application processing unit, to perform multiple server or multiple client connection processing and data collection and transmission processing through each link, thereby providing the corresponding multiple server or In addition to preventing system resource wastage when connecting multiple clients, access and management of each link and management of corresponding process modules can be easily performed.

Claims (12)

A client module which attempts to connect to a corresponding server for each link and performs data collection and transmission processing for multiple servers through each connected link; A server module for processing a link connection to a client required to be connected through each link, and performing data collection and transmission processing for multiple clients through each connected link. Multiple access module. The method of claim 1, The client module includes: a multi-server connection unit for monitoring a connection attempt and a connection state with a server corresponding to each link; A data collection processing unit for collecting data inputted through the multi-server connection unit from each server and transferring the data to a corresponding application processing unit in a packet form; And a data transmission processor for transmitting the data transmitted from the application processor to the corresponding server side through the multiple server connection unit. The method of claim 2, The multi-server connection unit may include: a connection control unit attempting to connect to a server through each link, and checking whether or not each link is connected through an event flag or a message queue and retrying a connection at a predetermined period when the connection fails; TCP / IP server / characterized in that it further comprises a connection monitoring unit for monitoring the connection state of each link to disconnect the connection or report a link failure from the link test process to control the connection control unit to retry the link connection. Multiple access modules on the client. The method of claim 2, The data transmission processing unit may report link failure or exception processing occurring while transferring data transmitted from an application processing unit to a corresponding server side to the multi-server connection unit using an event flag or a message queue to retry the link connection. Featuring multiple access modules for TPC / IP server / client. The method of claim 1, The server module includes: a multi-client connection unit which processes a link connection to a client required to be connected through each link and collects data on the client side input through each link; And a data transmission processor for transmitting data transmitted from an application processor to a corresponding client side through the multi-client connection unit. The method of claim 5, The multi-client connection section includes: a connection processing section that accepts a link connection to a client requesting connection through each link and configures new socket and link information; And a data collection processing unit for collecting data of the client side input through the link connected by the connection processing unit and transferring the data to the application processing unit in the form of a packet. In the TCP / IP server / client multiple connection method, Attempting to connect to a server through each link to perform a multi-server connection; Constructing socket and link information for each link attempted to perform multiple client accesses; A method of multiple access of a TPC / IP server / client comprising the step of performing data transmission processing with a counterpart server or a client through each connected link. The method of claim 7, wherein The link information may include address information, TCP connection port information, connection state information, and descriptor information of an accepted socket connected to a client connected through a corresponding link. . The method of claim 7, wherein The performing of the multi-server connection may include: attempting to connect to a server through each link; Checking whether a connection attempted link is connected and retrying a link connection when the connection fails; Monitoring the connected link status to determine if the connection is down or a link failure is reported; And retrying the connection for the link in which the connection has been disconnected or a link failure has been reported. The method of claim 7, wherein The process of performing the multi-client connection may include receiving a client connection request attempted to connect through each link using a selection statement and configuring corresponding socket and link information; Collecting client data transmitted over each currently connected link; And configuring the collected data in the form of a packet and delivering the collected data to an application processing unit through a message queue. The method of claim 7, wherein The process of performing data transmission through each link may include: checking whether a link connected to a server or a client to which data transmitted from an application processor is to be transmitted is activated; And transmitting the data to the counterpart server or the client through the activated link when the link is activated. The method of claim 11, Checking whether the link is activated, if the link is not activated, retrying a link connection a predetermined number of times; Transmitting the data to the counterpart server or the client when the retry link is normally connected; And discarding the data if the retry link is not normally connected.