JP2001285397A - Communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems, at communicating between a client machine and a server machine, that all of transmitting data have to be transmitted via a local data storage and a server data storage without exception irrelevant to the status of connection so that the response becomes slow. SOLUTION: The communication system has a detecting means detecting the status of connection between the client machine and the server machine, and changes dynamically the storage target responding to the status so as to optimize an overhead of data passing and shorten the response time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asynchronous communication for collecting data from a client using a data storage between a client as a first communication device and a server as a second communication device. The present invention relates to a communication system that performs communication for reducing overhead.

[0002]

2. Description of the Related Art FIG. 25 is a diagram showing a conventional data collection method. In FIG. 25, reference numeral 100 denotes a client machine. 200 is an application server. 103 is a client application. 1
04 is a client storage manager. 105
Is a local data repository. 206 is a server application. Reference numeral 207 denotes a server storage manager. Reference numeral 208 denotes a server data storage. Three
Reference numeral 00 denotes a public communication network, and reference numeral 301 denotes a communication path for performing communication between the client machine 100 and the server machine 200.

Next, the operation will be described. The client application 103 is the server application 2
The transmission data addressed to 06 is passed to the client storage manager 104. Client hangar manager 104
Temporarily stores the received data in the local data storage 10
Save to 5. Client hangar manager 104
Connects the data stored in this way to the server hangar manager 207 in accordance with a transmission instruction from the user or the like,
The data stored in the local data storage 105 is passed to the server storage manager 207. Further, at this time, the data received from the server storage manager 207 and addressed to the client application 103 is received and stored in the local data storage 105. The client storage manager 104 extracts the data received from the local data storage 105 and
Pass the received data to. Similarly, the server application 206 passes data to be transmitted to the client application 103 to the server storage manager 207. The server storage manager 207 temporarily stores the received data in the server data storage 208. When the server hangar manager 207 is connected from the client hangar manager 104, the local hangar 1
The data received in the server application 206 is stored in the server data storage 208. At the same time, the data addressed to the client application 103 is extracted from the server data storage 208,
Pass it to the client hangar manager 104. The server storage manager 207 extracts the data received from the server data storage 208 and passes the received data to the server application 206. As described above, the client application 103 and the server application 206 perform the asynchronous communication via the local data storage 105 and the server data storage 208.

[0004]

In the conventional system, when a client application and a server application communicate, all transmission data must pass through a local data storage and a server data storage, and the response performance is low. There was a problem that it was slow.

The present invention has been made to solve the above problems, and has as its object to enable an optimum response performance according to the connection state between a client machine and a server machine.

[0006]

The present invention comprises a first communication device and a second communication device connected via a communication network according to the present invention, wherein the first communication device and the second communication device are connected to each other. Is
In a communication system for performing information communication in response to a communication request from the first communication device, the first communication device may include a first connection detection unit configured to detect a connection state with the second communication device; The first data storage for storing the information and the information addressed to the second communication device are input, and based on the connection status with the second communication device detected by the first connection detection unit, A first communication device for transmitting information addressed to the second communication device to the second communication device, and storing the information addressed to the second communication device in the first data storage. And a first connection response unit that notifies the first connection detection unit of the first communication device of the connection state.

In a communication system according to the present invention, the communication system further includes a third communication device connected to the second communication device, and the first communication device includes
The second communication device communicates information with the third communication device via the second communication device using the second communication device as a relay device, and the second communication device is connected to the third communication device. Based on a connection state between the second communication storage unit that detects information, a second data storage that stores information, and the third communication device that is detected by the second connection detection unit.
To transmit the information transmitted from the first communication device to the third communication device, and to store the information input from the first communication device in the second data storage. A second manager, and the third communication device further includes a second connection response unit that notifies a second connection detection unit of the second communication device of a connection state. I do.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a diagram showing an example of the communication system of the present invention in the first embodiment. 1 is a client machine. 2 is a server machine. 3 is a client application. 4a is a client hangar manager. 5 is a local data storage. 6 is a server application. 7a is a server hangar manager. Reference numeral 8 denotes a server data storage. 9 is
This is a connection detection function. Reference numeral 10 denotes a connection detection response function. Reference numeral 300 denotes a public communication network, and 301 denotes a conventional example shown in FIG.
5 is a communication path used for communication between the client hangar manager 4a and the server hangar manager 7a. Reference numeral 302 denotes a connection detection function 9 and a connection detection response function 10
Is a communication path for communicating information for detecting connection used by the communication. In FIG. 1, a client machine 1 is a first communication device, and a server machine 2 is a second communication device. The connection detection function 9 is a first connection detection unit,
The connection detection response function 10 is a first connection response unit. The client storage manager 4a is a first manager, and the local data storage 5 is a first data storage. In the first embodiment, the communication path is set to the communication path 301,
An example of a communication system having a configuration 302 and two will be described. The connection of the communication path 301 is based on the premise that the connection of the communication path 302 is established. FIG. 2 shows a flowchart of the client application. FIG. 3 shows a flowchart of the server application. 4 to 7 show flowcharts of the client storage manager. 8 to 10 show flowcharts of the server storage manager. FIG. 11 shows a flowchart of the connection detection function. FIG. 12 shows a flowchart of the connection detection response function.

Next, the operation of the client machine 1 and the server machine 2 will be described with reference to the flowcharts of FIGS. In FIG. 2, the client application 3 creates transmission data (S1) and passes the transmission data to the client storage manager 4 (S2). In FIG. 4, the client storage manager 4a waits for a processing request from the client application 3 or the connection detection function 9 (S6), and receives a notification of the result of detecting the connection state with the server machine 2 from the connection detection function 9 (S6). In S7) and S8, it is confirmed whether the communication path 301 (the communication path 301 is a communication path for performing communication between the client storage manager 4a and the server storage manager 7a) is already connected. If connected, S again
The process returns to the processing of step 6. If not, the client hangar manager 4a is
Is connected to (S9). Then, the process returns to S6. In step S7, if the notification of the detection result is not received from the connection detection function 9, the process of step S10 is performed. In the processing of S10, the client storage manager 4a confirms a processing request from the client application 3.
When the processing request from the client application 3 is a transmission instruction, the processing in FIG. 5 is performed, and when the processing request is a reception instruction, the processing in FIG. 6 is performed. The client storage manager 4a checks the elapse of the preset time, and if there is no processing request from the client application 3 or the connection detection function 9 even after the elapse of the set time, the processing in FIG. Do. S in FIG.
2, when the transmission data is passed from the client application 3 to the client storage manager 4, the processing in FIG. 5 is performed. In FIG. 5, when the client storage manager 4a receives transmission data from the client application 3 (S11), it checks the destination (S12). When the destination is the own machine, the transmission data is stored in the local data storage 5 (S19). When the destination is not the local machine, the client hangar manager 4
When a is not connected to the server storage manager 7a (S13), the transmission data is stored in the local data storage 5 (S19). Client Hangar Manager 4
When a is connected to the server hangar manager 7a (S13), first, a server whose destination is not its own machine is fetched from the local data hangar 5 (S14) and passed to the server hangar manager 7a (S15). The extracted transmission data is deleted (S17).
Then, the transmission data received from the client application 3 is transmitted to the server storage manager 7a (S18). In step S15, the transmission data extracted from the local data storage 5 is transmitted to the server storage manager 7a, and at the same time, an instruction to transmit the transmission data addressed to the client machine 1 is given to the server storage manager 7a. May be passed to the server storage manager 7a in the above process. As shown in FIG. 8, the server storage manager 7a always waits for a processing request from the server application 6 or the client storage manager 4a (S30). When the processing request arrives, in S31, the server application 6
When the request is a transmission instruction request from the client storage manager 4a, the processing in S32 and thereafter is performed. When the request is a reception instruction request from the client storage manager 4a, the processing in FIG. Together with an instruction request to transmit transmission data addressed to the client machine 1 to the client storage manager 4a (this instruction request is referred to as a synchronization instruction request) in FIG.
The processing shown in is performed. Upon receiving the transmission data from the client storage manager 4a in S15 or S18 in FIG. 5, the server storage manager 7a performs the processing in FIG. In FIG. 9, the server hangar manager 7a
When a synchronization instruction is received from the client storage manager 4a, the transmitted data is stored in the server data storage 8 as shown in FIG. 9 (S60, S61), and the host name is received from the client storage manager 4a (S62). The host name is information for identifying the device name of the transmission source that has transmitted the transmission data, and the client machine 1 transmits the host name together with the transmission data to the server machine 2 so that the server machine The information addressed to the client machine 1 stored in the second server data storage 8 can be received. The server storage manager 7a extracts the transmission data whose destination is the host name from the server data storage 8 (S63), and passes the data to the client storage manager 4a (S64). The server storage manager 7a deletes the transmission data extracted from the server data storage 8 (S65).

The client application 3 issues a reception instruction request to the client storage manager 4a in addition to a processing request for generating transmission data and transmitting the generated data to the client storage manager 4a. The client hangar manager 4a manages the client application 3
When the reception instruction request is received, the processing of FIG. 6 is performed. In FIG. 6, the client storage manager 4a extracts transmission data whose destination is the own machine name from the data stored in the local data storage 5 (S20). Then, the extracted data is passed to the client application 3 (S21), and the transmission data extracted from the local data storage 5 is deleted (S22).

The client hangar manager 4a
Performs a timeout process shown in FIG. 7 if no processing request is received even after a predetermined time has elapsed. In FIG. 7, first, in S23, it is confirmed whether the communication path 301 is connected. If not, the process ends. If the connection is established, a destination whose local machine name is not the own machine name is extracted from the local data storage 5 (S
24), the extracted transmission data is transmitted to the server storage manager 7a and a synchronization instruction is passed (S2).
5). Then, the data retrieved from the local data storage 5 is deleted (S26). Thereafter, in S27, the host name is passed to the server storage manager 7a. Thereafter, the server storage manager 7a receives the transmission data addressed to the client machine 1 (S
28). The client hangar manager 4a executes S28
The transmission data received in step (1) is stored in the local data storage 5. The above-described steps S23 to S29 are the processing at the time of timeout.

The server hangar manager 7a receives a transmission instruction request from the server application 6, similarly to the client hangar manager 4a. Upon receiving the transmission instruction request, the processing of S32 to S40 is performed. S32-S40
5 has the same operation as the processing of S11 to S19 in FIG. 5 except that the processing target is not the local data storage 5 but the server data storage 8. Therefore, S3
The description of the processing of 2 to S40 will be omitted.

The server hangar manager 7a receives a reception instruction request from the server application 6 like the client hangar manager 4a. Upon receiving the reception instruction request, the server hangar manager 7a
Is performed. The processing of S50 to S52 in FIG.
Although the contents of the processing are the same as the processing of 0 to S22, the difference is that the processing target is not the local data storage 5 but the server data storage 8, and the details of the processing are omitted.

FIG. 3 is a flowchart of the server application. The server application 6 passes a reception instruction to the server storage manager 7a (S
3) As a response to the reception instruction, transmission data addressed to the server machine 2 is received from the server storage manager 7a (S4). The server application 6 performs a process according to the received data (S5).

FIG. 11 is a flowchart of the connection detecting function. The connection detection function 9 waits for the elapse of a preset time (S42), and after the elapse of the preset time, transmits a connection confirmation message to the server machine 2 using the communication path 302 (S43). Connection detection function 9
Is received by the connection detection response function 10 of the server machine 2. According to FIG. 12, the connection detection response function 10 waits for a connection confirmation message from the client machine 1 (S46), and when the confirmation message arrives, transmits a response message to the connection detection function 9 (S47). When the response message is transmitted from S47 (S44), a connection notification is sent to the client storage manager 4a (S45). Client hangar manager 4 sent a connection notification from connection detection response function 10
a performs the processing of S8 and S9 in FIG. If there is no response from the connection detection response function 10, the client machine 1
And the server machine 2 are not connected, and the process returns to S42.

As described above, the storage destination is dynamically changed to the local data storage and the server data storage in accordance with the state in which the client machine 1 and the server machine 2 are connected, and the asynchronous communication between the client application and the server application is performed. I do.

In the first embodiment, an example is shown in which the connection state is determined by the connection detection function and the connection detection response function.
S (Personal handyphone sys
tem) or a device that performs wireless communication such as satellite communication, and determines the state of connection with the server machine using the strength of radio waves in wireless communication, the data transfer speed, and the type of network, and transmits data. The storage destination may be dynamically changed.

In the first embodiment of the present invention, in asynchronous communication between a client application and a server application, means for storing transmission data of the client application (local data storage) and means for storing transmission / reception data of the server application (server data storage) ), Means for detecting a connection state, and means for responding to the connection detection, wherein a data storage location is dynamically changed according to the connection state to reduce data transfer overhead. An example has been described.

As described above, by dynamically changing the data storage destination according to the connection state, the data transfer overhead can be optimized and the response time can be shortened. For example, electricity usage is collected and stored in the memory of the portable device, and transmitted to the collection center server machine at the end of data collection, or the sales amount of the vending machine is collected and transmitted to the center server machine. The communication system of the present invention can be used for such a data collection system.

Embodiment 2 In the second embodiment, an example of a communication system in which a gateway server is installed between the client machine and the server machine described in the first embodiment to collect data will be described.

FIG. 13 is a diagram showing one embodiment of the communication system of the present invention in the second embodiment. In FIG. 13, reference numeral 1 denotes a client machine. 2 is a server machine. 3 is a client application. 4b is a client hangar manager. 5
Is a local data repository. 9a denotes a connection detection function, which detects a connection state between the gateway server 11 and the client machine 1. 14a is a connection information table. A detailed description of the connection information table will be given later. 6 is a server application. 7a
Is a server hangar manager. Reference numeral 8 denotes a server data storage. Reference numeral 10a denotes a connection detection response function that returns a response to the connection state confirmation from the gateway server 11. 11 is a gateway server. Reference numeral 12 denotes an intermediate hangar manager. Reference numeral 13 denotes an intermediate data storage. Reference numeral 10b denotes a connection detection response function that returns a response to a connection confirmation notification from the connection detection function 9a of the client machine 1. Reference numeral 9b denotes a connection detection function for detecting a connection state between the gateway server 11 and the server machine 2. 14b is
It is a connection information table. Reference numeral 300 denotes a public communication network connecting the client machine 1 and the gateway server 11, and reference numeral 301 denotes a communication path for performing communication between the client storage manager 4b and the intermediate storage manager 12. Reference numeral 302 denotes a connection detection function 9a and a connection detection response function 1
0b for communication. Reference numeral 402 denotes a communication path for performing communication between the connection detection function 9b and the connection detection response function 10a. Reference numeral 401 denotes a communication path for performing communication between the intermediate storage manager 12 and the server storage manager 7a. In FIG. 13, a server machine 2 is a third communication device, and a gateway server 11
Is the second communication device, and the client machine 1 is the first communication device.
Communication device. The connection detection response function 10a is a second connection response unit. The connection detection response function 10b is the first
It is assumed that the intermediate data storage 13 is a second data storage, and the intermediate storage manager is a second manager. As shown in FIG. 13, the server machine 2 shown in FIG. 1 according to the first embodiment is provided with the connection detection function 9b, so that the server machine 2 shown in FIG. 1 can be a gateway server. .
In FIG. 13, although there is one client machine 1 and one gateway server 11, a plurality of client machines 1 exist and are divided into several groups, one for each group. Assume a system to which a gateway server is assigned. Since there is one gateway server in a group of client machines divided into several groups, if there are several groups, there are as many gateway servers as the number of the groups. The server machine is assumed to be a device installed in a center that collects data transmitted from a plurality of gateway servers.

FIGS. 14 to 17 show flowcharts of the client storage manager. 18 to 21,
3 shows a flowchart of an intermediate hangar manager. FIG.
The flowchart of the connection detection function is shown in FIG. FIG. 23 shows the structure of the connection information table.

Next, the operation of the communication system will be described with reference to FIGS. The client machine 1
It has a connection information table 14a shown in FIG. The connection information table 14a is a table storing information necessary for the gateway server to receive data for the client machine from the server machine. In FIG. 23, the connection source is the client machine name, the intermediate connection destination is the gateway server name, and the connection destination is the server machine name. The connection detection function 9a of the client machine 1 periodically transmits a connection confirmation message to the connection destination of the connection information table 14a. Or,
A connection confirmation message is periodically transmitted to the gateway server machine name set as the intermediate connection destination in the connection information table 14a of the client machine 1. In FIG. 22, after a predetermined time has elapsed (S80), the connection detection function 9a accesses the connection information table 14a (S81), and if an intermediate connection destination is set, the connection detection function 9a proceeds to S8.
2, the connection detection response function 10b of the gateway server 11
A connection confirmation message is transmitted to (S82). If the connection destination exists, a connection confirmation message is transmitted to the connection detection response function 10a of the server machine 2 (S
83). As shown in S81 above, the connection detection function
It is checked whether an intermediate connection destination or a connection destination is set in the connection information table. In the second embodiment, the connection information table 1 of the client machine 1
It is assumed that the connection source and the intermediate connection destination are set in 4a, and the connection source and the connection destination are set in the connection information table 14b of the gateway server 11. In S84, it is confirmed whether there is a response to the processing in S82 or S83, and if the connection can be confirmed, the result of detecting the connection is notified to the client storage manager 4b (S85). Similarly, the connection detection function 9b of the gateway server periodically transmits a connection confirmation message to the connection detection response function 10a of the server machine 2 (S83). The result of detecting the connection is notified (S85).

The processing procedure of the client storage manager 4b of the client machine 1 shown in FIG. 14 to FIG. 17 is the same as the processing procedure shown in FIG. 4 to FIG. The difference is that it is not a machine but a gateway server. In S90 and S91, the intermediate hangar manager 12 is a processing target. For this reason,
Detailed description of the processing procedure is omitted. The processing procedure of the gateway server shown in FIGS. 18 to 21 is the same as that of S6 to S9 of FIG. 4 in the processing of S53 to S56. In the processing of S57 in FIG. 18, the intermediate hangar manager 12 determines whether the request is a processing request from the connection detection function 9b or a processing request from the client hangar manager 4b. In the determination of S57, when there is a transmission instruction request from the client hangar manager 4b to the intermediate hangar manager 12 of the gateway server 11, the processing of FIG. 19 is performed. The transmission instruction from the client storage manager 4b is an instruction requested by the processing of S90 and S91 in FIG. The synchronization instruction request is a synchronization instruction request requested by the process in S92 from the client storage manager 4b in FIG.
The timeout process shown in FIG.
This is a process that is performed when there is no processing request from either the connection detection function 9b or the client storage manager 4b within the time set in advance for the second.

The intermediate hangar manager 12 shown in FIG.
Will be briefly described when data is transmitted from the client storage manager 4b. The intermediate hangar manager 12 receives the transmission data from the client hangar manager 4b (S58), and when connected to the server hangar manager 7a (S100), transmits the transmission data to the server hangar manager 7a (S101 to S101).
(S105) When not connected, it is stored in the intermediate data storage 13 (S106).

Next, a brief description will be given of the processing when there is a synchronization instruction request in FIG. The synchronization instruction request is made in S of FIG.
Requested by the client storage manager 4b in the process of 92. In FIG. 21, the intermediate hangar manager 12
Receives the transmission data together with the synchronization instruction from the client storage manager 4b (S114). Then, the received data is stored in the intermediate data storage 13 (S1).
15) Then, a host name list is received from the client storage manager 4b (S116). This host name list is the host names transmitted in the process of S27 in FIG. Based on the received host name, a destination whose destination matches the host name is extracted from the intermediate data storage 13 (S
117), and sends the extracted data to the client storage manager 4b (S118). Thereafter, the data retrieved from the intermediate data storage 13 is deleted (S11).
9).

Further, the processing when a timeout occurs will be described with reference to FIG. In the process of S107, if the gateway server 11 and the server machine 2 are connected (check whether the communication path 401 is connected), the destination from the intermediate data storage 13 is the connection source host name in the connection information table 14b. The server extracts the data not in the list (S68) and passes the data and the transmission instruction to the server storage manager 7a (S109). And
The transmission data extracted from the intermediate data storage 13 is deleted (S110). Subsequently, in S111, the host name list of the connection source in the connection information table 14b is passed to the server storage manager 7a. Thereafter, the transmission data of the destination that matches the host name set in the connection source host name list passed from the server storage manager 7a to the server storage manager 7a is received (112), and the received data is stored in the intermediate data storage 13. To be stored (S11
3).

As described above, the storage destination is dynamically changed to the local data storage, the intermediate data storage, and the server data storage according to the connection state by the connection detection function and the connection detection response function, and the asynchronous communication between the client application and the server application is performed. I do.

As described above, through the intermediate data storage, the connection load from the client machine of the server machine can be reduced. Also, by dynamically changing the data storage destination according to the connection state, the data transfer overhead can be optimized and the response time can be shortened. Although FIG. 13 shows an example in which the gateway server has a single-stage configuration between the client and the server, the gateway server may have a multi-stage configuration. By using multiple stages, the connection load of the server can be further reduced. FIG. 24 shows an example of a communication system having a multi-stage configuration. In FIG. 24, a client machine 1 is a portable terminal 1a having a data collection function.
To 1f. The mobile terminals are divided into three groups, the mobile terminals 1a and 1b are groups connected to the gateway machine 11a, and the mobile terminals 1c and 1d are
1b is a group connected to the mobile terminals 1e and 1f.
Is a group connected to the gateway machine 11c. Further, gateway machines 11a and 11b
Is connected to the gateway machine 11d, and the gateway machine 11c is connected to the gateway machine 11e. The gateway machines 11d and 11e are connected to the server machine 2. For example, assuming that the sales amount of vending machines is collected, the sales amount collected in the Kanto area is stored in the gateway machine 11a, the sales amount collected in the Kansai area is stored in the gateway machine 11b, and the Kyushu area is stored. Can be considered to be stored in the gateway machine 11c. Further, the sales amounts in the Kanto and Kansai regions are stored in the gateway machine 11d, the sales amounts in the Kyushu region are stored in the gateway machine 11e, and finally, the sales amounts of the gateway machines 11d and 11e are stored in the server machine 2. Thus, the nationwide sales amount is collected on the server machine. The multi-stage configuration of the gateway server is based on a system configuration in which the gateway machines 11d and 11e are connected to the gateway machines 11a to 11c in FIG.

In the second embodiment, the first embodiment
Means for storing transmission / reception data of a client application, means for relaying means for storing transmission / reception data of a server application (intermediate data storage), means for detecting a connection state on a gateway server, and connection detection An example of a communication system has been described in which a means for responding to a communication is provided and a data storage location is dynamically changed according to a connection state to reduce data transfer overhead.

[0031]

As described above, in the communication system of the present invention, the location where data to be communicated is stored can be dynamically changed depending on the connection state between the first communication device and the second communication device. For this reason, there is an effect that the overhead of data transfer performed between the first communication device and the second communication device is optimized, and the response time can be shortened.

Further, by installing a relay device as a second communication device between the first communication device and the third communication device, the first communication device for the server machine as the third communication device can be obtained. Connection load from the client machine can be reduced. Also, the relay device and the server machine, and
The storage destination of data to be communicated can be dynamically changed according to the respective connection states of the client machine and the relay device. For this reason, there is an effect that the overhead of transferring data to be communicated is optimized and the response time can be shortened.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a communication system according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing a flowchart of a client application according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a flowchart of a server application according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a flowchart of a client storage manager according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a flowchart of a client storage manager according to the first embodiment of the present invention.

FIG. 6 is a diagram showing a flowchart of a client storage manager according to the first embodiment of the present invention.

FIG. 7 is a diagram showing a flowchart of a client storage manager according to the first embodiment of the present invention.

FIG. 8 is a diagram showing a flowchart of the server storage manager according to the first embodiment of the present invention.

FIG. 9 is a diagram showing a flowchart of the server storage manager according to the first embodiment of the present invention.

FIG. 10 is a diagram showing a flowchart of the server storage manager according to the first embodiment of the present invention.

FIG. 11 is a diagram showing a flowchart of a connection detection function according to the first embodiment of the present invention.

FIG. 12 is a diagram showing a flowchart of a connection detection response function according to the first embodiment of the present invention.

FIG. 13 is a diagram showing an example of a communication system according to Embodiment 2 of the present invention.

FIG. 14 is a diagram showing a flowchart of a client storage manager according to the second embodiment of the present invention.

FIG. 15 is a diagram showing a flowchart of a client storage manager according to the second embodiment of the present invention.

FIG. 16 is a diagram showing a flowchart of a client storage manager according to the second embodiment of the present invention.

FIG. 17 is a diagram showing a flowchart of a client storage manager according to the second embodiment of the present invention.

FIG. 18 is a diagram showing a flowchart of an intermediate storage manager according to the second embodiment of the present invention.

FIG. 19 is a diagram showing a flowchart of an intermediate storage manager according to the second embodiment of the present invention.

FIG. 20 is a diagram showing a flowchart of an intermediate storage manager according to the second embodiment of the present invention.

FIG. 21 is a diagram showing a flowchart of an intermediate storage manager according to the second embodiment of the present invention.

FIG. 22 is a diagram showing a flowchart of a connection detection function according to the second embodiment of the present invention.

FIG. 23 is a diagram showing an example of a connection information table according to the second embodiment of the present invention.

FIG. 24 is a diagram illustrating an example of a communication system according to the present invention in the second embodiment.

FIG. 25 is a diagram showing an example of a conventional data collection method.

[Explanation of symbols]

1 client machine, 1a-1f portable terminal, 2
Server machine, 3 client application, 4
a, 4b client hangar manager, 6 server application, 7a server hangar manager, 8
Server data storage, 9, 9a, 9b connection detection function,
10, 10a, 10b connection detection response function, 11 gateway server, 11a to 11e gateway machine, 12 intermediate storage manager, 13 intermediate data storage, 14a, 14b connection information table, 300 public communication network, 301, 302, 401, 402 communication Road.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazufumi Ota 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) in Mitsubishi Electric Corporation 5B089 GA11 GA21 GA31 JA36 KA05 KC15 KC29 KC60 5K034 DD01 FF11 HH01 HH42 NN23

Claims (2)

[Claims] A first communication device and a second communication device connected via a communication network, wherein the first communication device and the second communication device are connected to each other via the first communication device. In the communication system for performing information communication in response to a communication request from the first communication device, the first communication device includes a first connection detection unit that detects a connection state with the second communication device, and a first storage device that stores information. A data storage, and information addressed to the second communication device is input, and based on a connection state with the second communication device detected by the first connection detection unit, the information addressed to the second communication device is input. A first manager for transmitting information addressed to the second communication device and storing information addressed to the second communication device in the first data storage; The second communication device is a first connection detection unit of the first communication device. A communication system, comprising: a first connection response unit that notifies a connection state to the communication system. 2. The communication system according to claim 2, further comprising:
A third communication device connected to the third communication device, the first communication device uses the second communication device as a relay device, and communicates with the third communication device via the second communication device. The second communication device, a second connection detection unit that detects a connection state with the third communication device, a second data storage that stores information, and the second connection Transmitting the information transmitted from the first communication device to the third communication device based on the connection state with the third communication device detected by the detection unit; A second method for storing information input from the communication device in the second data storage.
The third communication device further includes a second connection response unit that notifies a second connection detection unit of the second communication device of a connection state. Item 2. The communication system according to Item 1.