JP2006319707A - Communication system, polling method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To materialize real-time communication and little communication traffic in the instant messaging environment wherein such communication from the outside as an intranet is disturbed by a firewall. <P>SOLUTION: An instant message client 11 comprises a message communication unit 27 capable of changing a polling interval of HTTP polling, and a communication control unit 26 for specifying a time interval of HTTP polling on the basis of schedule information for showing a schedule which should access instant message server 12 frequently. Before the arrival of a schedule shown in schedule information, the communication control unit 26 gives the message communication unit 27 the directions that the polling to an instant message server 12 may be performed with a polling interval of a long interval. At the time of the arrival of a schedule, it gives the message communication unit 27 the directions to perform the polling with a polling interval of a short interval. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for controlling a polling interval when performing polling, and more particularly to a technique for controlling a polling interval between a server and a client in message communication in which instant messages are transmitted and received after polling.

  For instant message use in a general enterprise, the instant message server exists on the Internet and can be freely accessed, but the instant message client exists on the local network in the intranet and is blocked by a firewall. It is almost impossible to communicate. The firewall permits HTTP connection from the inside to the outside of the local network, but does not allow connection from the outside to the inside.

If you can communicate directly without going through the firewall on the Internet, you can connect directly using the TCP protocol, but if you are behind the firewall, periodically poll the server on the Internet from the terminal in the firewall. It is necessary to do this (for example, Patent Document 1).
Japanese Patent Laying-Open No. 2003-319067 (page 58, FIG. 31)

  In instant messaging communication beyond a conventional firewall, an instant message client on a local network blocked by the firewall performs HTTP polling in a short period in order to realize real-time communication through an instant message server on the Internet. There is a need.

  Usually, since there are a large number of instant message clients, if all instant message clients perform HTTP polling in a short period, the communication load on the instant message server side increases. For this reason, the interval between HTTP polling of all instant message clients cannot be set to a unit of several seconds, and a considerably large time interval of several minutes is required. As a result, there is a problem that a time lag occurs between the instant message transmission timing at the instant message destination and the instant message reception timing at the instant message destination, and real-time communication cannot be realized.

  The main object of the present invention is to solve the above-mentioned problems. When polling intervals are variable, polling is usually performed with a relatively long interval, and frequent polling is expected to be required. By reducing the polling interval, it is possible to reduce the load on the polling destination server and to enable real-time communication.

The communication device according to the present invention is
A polling execution unit capable of performing polling at any one of a first polling interval and a second polling interval different from the first polling interval;
A switching reference storage unit that stores a switching reference for switching between the first polling interval and the second polling interval;
Polling for determining whether or not a switching criterion is satisfied and instructing the polling execution unit to switch between a first polling interval and a second polling interval when the switching criterion is satisfied And an interval instruction unit.

  According to the present invention, normally, polling is performed at a long polling interval, and when the switching criterion is satisfied, it is possible to switch to a short polling interval. In addition, since polling can be performed at a short polling interval, real-time communication is possible.

Embodiment 1 FIG.
FIG. 1 is a conceptual diagram of a target network configuration in the present embodiment.

  FIG. 2 is a diagram illustrating a configuration example of an instant message client, an instant message server, and a reservation system that are targets in the present embodiment.

  FIG. 3 is a flowchart showing an operation example of the instant message server targeted in the present embodiment.

  FIG. 4 is a flowchart showing an operation example of the instant message client targeted in the present embodiment.

  In FIG. 1, 11 is an instant message client a which is a client of a user who uses an instant message. The instant message client a11 is an example of a communication device. An instant message server 12 manages communication between instant message clients. The instant message server 12 is an example of a polling destination device. Reference numeral 13 denotes the Internet that connects these servers and clients. Reference numeral 14 denotes a local network to which the instant message client a11 is connected. Reference numeral 15 denotes a firewall that needs to pass through when connecting to the Internet 13 from within the local network 14. Reference numeral 16 denotes a destination instant message client b.

  In FIG. 2, the instant message server 12 includes a context notification unit 21 and a message relay unit 28.

  The context notification unit 21 notifies the client of context information. In the present embodiment, the context information is schedule information stored in the schedule information storage unit 23 of the reservation system 22. The message relay unit 28 performs message communication of instant messages and other messages with the instant message client a11.

  The instant message client a11 includes a context acquisition unit 24, a schedule information storage unit 25, a communication control unit 26, and a message communication unit 27.

  The message communication unit 27 performs polling on the instant message server 12. Also, an instant message is received from the instant message server 12. The message communication unit 27 can perform polling at either a long polling interval (first polling interval) or a short polling interval (second polling interval). The message communication unit 27 normally performs polling at a polling interval with a long interval, and in a specific case, performs polling at a polling interval with a short interval. The message communication unit 27 is an example of a polling execution unit.

  The context acquisition unit 24 acquires schedule information (context information) from the instant message server 12. The schedule information describes a schedule that is expected to increase the number of instant messages addressed to the instant message client a11. The schedule information indicates a schedule for the message communication unit 27 to switch from a long polling interval (first polling interval) to a short polling interval (second polling interval). It is.

  The schedule information storage unit 25 stores the schedule information acquired from the instant message server 12 by the context acquisition unit 24. The schedule information storage unit 25 is an example of a switching reference storage unit.

  The communication control unit 26 determines whether or not the schedule indicated in the schedule information stored in the schedule information storage unit 25 has arrived, and before the arrival of the schedule, a polling interval having a long interval (the first interval) The message communication unit 27 is instructed to execute polling at a polling interval, and after the schedule arrives, the message communication unit 27 is instructed to execute polling at a short interval (second polling interval). The communication control unit 26 is an example of a polling interval instruction unit.

  The reservation system 22 is an external reservation system linked with the instant message server 12. The schedule storage unit 23 stores schedule information.

  Next, the target network environment will be described. As shown in FIG. 1, the instant message client a <b> 11 exists in the local network 14 and is isolated from the Internet 13 through a firewall 15. The instant message server 12 can be directly connected to the Internet 13 and can be freely accessed from various terminals through the Internet 13. Such a network environment is a normal usage form of instant messages in a company. For example, when the message exchange is performed between the instant message a11 belonging to the local network 14 and the instant message client b16 directly connected to the Internet 13, the instant message server 12 needs to be relayed. When a message is transmitted from the instant message client a11 to the instant message client b16, when the message is notified from the instant message client a11 to the instant message server 12, the message is relayed from the instant message server 12 to the instant message client b16. Is possible. However, when a message is transmitted from the instant message client b16 to the instant message a11, even if the message transmitted from the instant message client b16 is notified to the instant message server 12, the firewall 15 exists between the server and the client. A message cannot be immediately notified from the instant message server 12 to the instant message client a11. The instant message client a11 needs to periodically poll the instant message server 12 using the HTTP protocol that passes through the firewall 15.

  In FIG. 2, message exchange between the instant message client a <b> 11 and the instant message server 12 is performed between the message communication unit 27 and the message relay unit 28. The message communication unit 27 polls the message relay unit 28 using the HTTP protocol at regular time intervals (for example, 1 minute).

  In the present embodiment, it is assumed that message communication between clients is used for a conference using an instant message, the conference schedule is managed by the reservation system 22, and the conference schedule is indicated in the schedule information. To do. In this case, the schedule (time zone) indicated in the schedule information is a time zone in which the instant message addressed to the instant message client a11 is expected to increase. For this reason, the instant message server 12 is addressed to the instant message client a11. This is a time zone in which many instant messages are expected to be accumulated. For this reason, the context notification unit 21 of the instant message server 12 notifies the schedule information of the reservation system 22 to the context acquisition unit 24 of the instant message client a11. The polling interval can be shortened, and real-time communication can be performed effectively.

  As shown in FIG. 3, when the context notification unit 21 is connected from the context acquisition unit 24 of the instant message client a11 and receives client identification information (S31), the scheduling information of the instant message client a11 is sent to the reservation system 22. An inquiry is made as to whether or not there is (S32). If there is a schedule, the schedule information of the corresponding client is acquired, and the schedule information is notified to the context acquisition unit 24 (S33). Even if there is no corresponding schedule, the context acquisition unit 24 is notified that there is no schedule (S34).

  The context acquisition unit 24 periodically connects to the context notification unit 21 and tries to acquire schedule information. If the schedule information can be acquired, the schedule is stored in the schedule information storage unit 25.

  As shown in FIG. 4, the communication control unit 26 monitors the schedule information and checks whether the current time corresponds to the time scheduled for the schedule (S41) (polling interval instruction step). If applicable, it is determined whether polling is currently being executed at a short polling interval (S42) (polling interval instruction step), and polling is executed at a short polling interval (since the schedule has already arrived). If the polling is in progress, the process returns to S41 and continues polling at the short polling interval as it is, and if polling is being executed at the long polling interval (because the schedule has just arrived), the communication control unit 26 27 is instructed to execute polling at a short polling interval (S43) (polling interval instructing step). And the message communication part 27 performs polling with a short polling interval (for example, 1 second) (S44) (polling execution step).

  On the other hand, when the current time does not correspond to the schedule in S41, the communication control unit 26 determines whether or not polling is currently being executed at a short polling interval (S45) (polling interval instruction step), and long polling. If polling is being executed at an interval, the process returns to S41 to continue polling even at a long polling interval, and if polling is being executed at a short polling interval (because it is immediately after the end of the schedule), the communication control unit 26 The message communication unit 27 is instructed to execute polling at a long polling interval (S46) (polling interval instruction step). And the message communication part 27 performs polling with a long polling interval (for example, 1 minute) (S47) (polling execution step).

  In this way, HTTP polling is performed at short time intervals only for the time corresponding to the schedule.

  Thus, in this embodiment, the interval at which the instant message client performs HTTP polling to the instant message server can be changed according to the schedule information transmitted from the instant message server, and the instant message server cooperates with the reservation system or the like. , Telling the instant message client “schedule information of times that should be frequently accessed”, and changing the HTTP polling interval according to the schedule information, the instant message client enables real-time communication when necessary, and communication traffic It can be reduced.

  In this embodiment, communication is performed with respect to the server only when it is deemed necessary from the instant message client. Therefore, even if polling is performed with respect to the server at a short time interval, the message can be transmitted with less communication traffic as a whole. Communication can be realized. In other words, the timing at which polling at a short time interval is required for each instant message client, so that each instant message client polls at a short interval only when necessary, and normally polls at a long interval. As a result, polling from instant messages is distributed as a whole. And since it is possible to poll the server at short time intervals, even instant messaging clients installed in the firewall can communicate messages in near real time to other instant messaging clients. .

  In FIG. 1, this time is linked with the schedule information of the reservation system. For example, when a meeting with a plurality of people is to be realized by an instant message, an efficient message can be obtained by informing the client in advance of the schedule. Communication is possible.

  Not only the schedule information of the reservation system but also other information such as personal schedule management system and personal mail transmission / reception time information may be acquired and notified to the client.

Embodiment 2. FIG.
In the first embodiment described above, schedule information is used as information for controlling communication timing. Next, an event that changes depending on time and place, such as the position and state of an individual, is set as a monitoring target. An embodiment in which the polling interval is switched when an event has a specific status will be described.

  FIG. 5 is a diagram illustrating a configuration example of an instant message client and an instant message server targeted by the present embodiment.

  FIG. 6 is a flowchart showing an operation example of the instant message server targeted in the present embodiment.

  FIG. 7 is a flowchart showing an operation example of the instant message client targeted in this embodiment.

  In FIG. 5, a context information storage unit 51 is connected in place of the reservation system 22 connected to the instant message server 12 in FIG. 2, and the context is stored in place of the schedule information storage unit 25 that stores schedule information in the instant message client a11. An information storage unit 52 and a context setting condition storage unit 53 are connected to the communication control unit 26. Further, a context condition setting unit 54 for setting a context condition is arranged.

  In the present embodiment, the context information is status information that notifies the status of the monitoring target event. For example, as will be described later, the status information indicates the position of a certain person periodically. The context acquisition unit 24 that receives context information from the context notification unit 21 of the instant message server 12 is an example of a status information reception unit.

  The context setting conditions stored in the context setting condition storage unit 53 are the conditions set by the context condition setting unit 54, and the polling interval (first polling interval) is changed from the long interval polling interval (first polling interval). This is a reference for switching to the second polling interval. The context setting condition specifies that a short polling interval is executed when the monitored event has a specific status. For example, when a certain person moves to a specific position, a short polling interval is specified. The context setting condition is an example of a switching criterion.

  Next, the operation will be described.

  As shown in FIG. 6, the context notification unit 21 first receives a request from the context acquisition unit (S31), and determines whether there is context information to be notified to the corresponding instant message client in the context information storage unit 51. Judgment is made (S61). If there is, the instant message client context information is acquired and notified to the instant message client (S63). If not, the instant message client is notified that there is no context information (S62).

  As shown in FIG. 7, the message communication control unit 26 determines whether there is any context information that matches the context setting condition (S71), and if it exists, connects to the server at a short polling interval, if any. (S42 to S44), if not, connection is made to the server at a long polling time interval (S45 to S47).

  The context setting condition is assumed to be input by the user in advance using the instant message client using the context condition setting unit 54. However, the context setting condition can be acquired from the server using the context acquisition unit or from other systems using other communication means. You may obtain it.

  The context setting condition is described in terms of position information, for example, that communication occurs between the client 1 and the client 2 when a certain person moves from the position 1 to the position 2. Referring to the context information including the history of the position information of the person in question, if it is determined that the user is moving from position 1 to position 2, it is determined that message exchange is started, and communication is performed at a short polling interval. I do.

  In FIG. 5 this time, it is determined whether or not communication is started with reference to the context information in conjunction with the context information managed by the server. With this, only the time as in the schedule of the first embodiment is a condition. Instead, for example, it is possible to realize efficient message communication in response to instant message communication related to location information and the user's previous course.

Embodiment 3 FIG.
In Embodiment 1 above, the instant message client directly connects to the instant message server to acquire schedule information of the reservation system. Next, other external communication means such as e-mail and instant message are used. An embodiment in which schedule information is notified to a client will be described.

  FIG. 8 is a diagram illustrating a configuration example of an instant message client, an instant message server, a reservation system, and an external communication unit that are targets in the present embodiment.

  FIG. 9 is a flowchart showing an operation example of the reservation system targeted in the present embodiment.

  In FIG. 8, reference numeral 81 denotes an external communication means for transmitting e-mails, instant messages, and the like, and 82 is a context notification unit for notifying context information. The external communication unit 81 is an example of an external device.

  Next, the operation will be described.

  The context acquisition unit 24 of the instant message client a11 instructs the context notification unit 21 to notify the schedule information in advance using some communication means (for example, direct network connection, mail, etc.). The context notification unit 82 of the reservation system 22 confirms whether there is an instruction to notify the schedule from the instant message client as shown in FIG. 9 (S91), and if not, waits for a certain time (S92) and confirms again. If there is, it is confirmed whether there is client schedule information corresponding to the reservation system 22 (S32). If there is a schedule, the schedule information is notified to the client using the external communication means 81 (S33). If not, a notification that there is no schedule is sent (S34).

  In addition, although an instruction to notify the schedule this time is given from the context acquisition unit 24, the setting may be made on the server, or the user may notify using other communication means.

  As described above, according to the present embodiment, the timing for acquiring the schedule of the client is not based on the timing notified from the client as in the first embodiment, but based on the information notified in advance, It is not necessary to send a request to the instant message server periodically from the instant message client, and communication traffic can be suppressed. Further, by using the external communication means 81, it is possible to notify the schedule using other communication means without directly communicating between the client and the server.

Embodiment 4 FIG.
In the first embodiment described above, an original part is added to the instant message server and the schedule information of the reservation system is notified to the instant message client. Next, the schedule information of the reservation system is notified as presence information. In the embodiment, the schedule can be notified to the instant message client without modifying the instant message server.

  FIG. 10 is a diagram illustrating a configuration example of an instant message client, an instant message server, and a reservation system that are targets in the present embodiment.

  FIG. 11 is a flowchart showing an operation example of the instant message client targeted in the present embodiment.

  In FIG. 10, 101 is a presence notification unit for notifying presence information subscribed in response to a request from a client, 102 is a presence information storage unit for accumulating presence information regarding various clients, and 103 is a client for which subscription is requested. It is a presence acquisition unit that acquires schedule information. The presence notification unit 101 and the presence information storage unit 102 are functions normally provided in an instant message server. A presence notification unit 104 connects to an instant message server, and when there is a request from the instant message server, notifies the schedule information stored in the schedule information storage unit 23 of the reservation system 22 as presence information, and 105 subscribes to the presence information. A presence subscription unit 106, which is a presence information storage unit that accumulates subscribed presence information.

  Next, the operation will be described.

  First, the basic operation of subscribing to general presence information will be described.

  The presence acquisition unit 103 of the instant message server 12 is notified of the presence information of the client and stores the presence information in the presence information storage unit 102. The presence subscription unit 105 of the instant message client a11 notifies the presence notification unit 101 of the instant message server 12 of the presence information of the client to be subscribed. The presence notification unit 101 acquires necessary presence information from the presence information storage unit 102 and notifies the instant message client. The presence subscription unit 105 of the instant message client stores presence information in the presence information storage unit 106. This is the basic operation of presence notification / subscription in instant messaging.

  In the present embodiment, the presence notification unit 104 of the reservation system 22 notifies the schedule information 2 as presence information to the presence acquisition unit 103 of the instant message server 12. Accordingly, the schedule information is stored as presence information in the presence information storage unit 102 by the presence acquisition unit 103. In the instant message client a11, the presence subscription unit 105 notifies the presence notification unit 101 to subscribe to the presence information of the reservation system, the presence notification unit 101 acquires the presence information of the reservation system (S111), and the acquired presence information Is included in the schedule information (S112). If the schedule information is included in the presence information, the schedule information is extracted from the presence information and stored in the schedule information storage unit 25. If the schedule information is not included in the presence information, the presence information is stored in the presence information storage unit 106, and the presence information is updated (S114). Normal presence information is stored in the presence information storage unit 106, and schedule information is stored in the schedule information storage unit 25.

  The message communication control unit monitors the schedule information as in the first embodiment, and adjusts the polling time interval by the HTTP protocol to the message relay unit 28 of the instant message server 12 according to the schedule.

  This time, the reservation system is provided with a presence notification unit that notifies the schedule information as presence information, and the schedule information is transmitted to the client as presence information, so that the schedule can be transmitted without implementing an additional function in the instant messaging server. Communication traffic control according to information can be performed.

  The schedule information acquired from the server this time is stored in the schedule information storage unit 25, but the present information is stored as it is in the presence information storage unit 106, and the message communication control unit 26 is stored in the presence information storage unit 106. The part corresponding to the schedule of information may be monitored to control the polling interval.

  In the above embodiment, the instant message client has been described as an example of the communication device. However, the instant message client may be any communication device that can perform polling at least two kinds of polling intervals and can change the polling interval. Other communication devices may be used.

  In each of the embodiments described above, the instant message client (communication device) can be realized by a computer.

  Although not shown, the instant message client (communication device) includes a CPU (Central Processing Unit) that executes a program.

  For example, the CPU is connected via a bus to a ROM (Read Only Memory), a RAM (Random Access Memory), a flash memory, a communication board, a display device, a K / B (keyboard), a mouse, an FDD (Flexible Disk Drive), and a CDD. (Compact disk drive), magnetic disk device, optical disk device, printer device, scanner device, etc. can be connected.

  The RAM is an example of a volatile memory. ROM, flash memory, FDD, CDD, magnetic disk device, and optical disk device are examples of nonvolatile memory. These are examples of a storage device or a storage unit.

  Data and information handled by the instant message client (communication device) according to each of the embodiments described above are stored in a storage device or a storage unit, and are recorded and read by each unit of the instant message client (communication device).

  The communication board is connected to a WAN (Wide Area Network) such as a LAN, the Internet, or ISDN.

  The magnetic disk device stores an operating system (OS), a window system, a program group, and a file group (database).

  The program group is executed by a CPU, OS, and window system.

  Each part of the instant message client (communication device) may be partly or entirely configured by a program operable by a computer. Alternatively, it may be realized by firmware stored in the ROM. Alternatively, it may be implemented by software, hardware, or a combination of software, hardware, and firmware.

  The program group stores a program that causes the CPU to execute the processing described as “˜unit” in the description of the embodiment. These programs are created by computer languages, such as C language, HTML, SGML, and XML, for example.

  The program is stored in another recording medium such as a magnetic disk device, FD (Flexible Disk), optical disk, CD (compact disk), MD (mini disk), DVD (Digital Versatile Disk), and read by the CPU. And executed.

The conceptual diagram which shows the network environment which concerns on embodiment. FIG. 3 is a diagram illustrating a configuration example of an instant message client, an instant message server, and a reservation system that are targets in the first embodiment. 5 is a flowchart illustrating an operation example of an instant message server as a target in the first embodiment. 5 is a flowchart illustrating an operation example of an instant message client as a target in the first embodiment. The figure which shows the structural example of the instant message client and instant message server made into object in Embodiment 2. FIG. 9 is a flowchart showing an operation example of an instant message server as a target in the second embodiment. 10 is a flowchart showing an operation example of an instant message client as a target in the second embodiment. The figure which shows the structural example of the instant message client made into Embodiment 3, the instant message server, the reservation system, and an external communication means. 10 is a flowchart showing an operation example of a reservation system as a target in the third embodiment. The figure which shows the structural example of the instant message client, instant message server, and reservation system which are object in Embodiment 4. FIG. 10 is a flowchart illustrating an operation example of a target instant message client in the fourth embodiment.

Explanation of symbols

  11 Instant Message Client a, 12 Instant Message Server, 13 Internet, 14 Local Network, 15 Firewall, 16 Instant Message Client b, 21 Context Notification Unit, 22 Reservation System, 23 Schedule Information Storage Unit, 24 Context Acquisition Unit, 25 Schedule Information Storage unit, 26 communication control unit, 27 message communication unit, 28 message relay unit, 51 context information storage unit, 52 context information storage unit, 53 context setting condition storage unit, 54 context condition setting unit, 81 external communication means, 82 context Notification unit 101 Presence notification unit 102 Presence information storage unit 103 Presence acquisition unit 104 Presence notification unit 105 Presence subscriptions unit, 106 the presence information storage unit.

Claims (10)

A polling execution unit capable of performing polling at any one of a first polling interval and a second polling interval different from the first polling interval;
A switching reference storage unit that stores a switching reference for switching between the first polling interval and the second polling interval;
Polling for determining whether or not a switching criterion is satisfied and instructing the polling execution unit to switch between a first polling interval and a second polling interval when the switching criterion is satisfied A communication apparatus comprising an interval instruction unit. The polling execution unit
As the second polling interval, it is possible to execute polling at an interval shorter than the first polling interval,
The switching reference storage unit is
Storing a switching criterion for switching from the first polling interval to the second polling interval;
The polling interval instruction unit
Usually, the polling execution unit is instructed to poll at the first polling interval, and the polling execution unit is instructed to poll at the second polling interval only while the switching criterion is satisfied. The communication apparatus according to claim 1. The switching reference storage unit is
Storing a switching criterion indicating a second polling interval execution schedule to be polled at the second polling interval;
The polling interval instruction unit
It is determined whether or not the second polling interval execution schedule has arrived. Before the second polling interval execution schedule arrives, the polling execution unit is instructed to perform polling at the first polling interval, and the second polling interval The communication apparatus according to claim 2, wherein after the execution schedule arrives, the polling execution unit is instructed to perform polling at a second polling interval. The communication device
A communication device that receives a communication message addressed to its own device stored in a polling destination device that is a polling destination from the polling destination device by performing polling,
The switching reference storage unit is
4. The communication apparatus according to claim 3, wherein a switching reference indicating a schedule for which a communication message addressed to the apparatus is accumulated in the polling destination apparatus as a second polling interval execution schedule is stored. . The communication device
The communication apparatus according to claim 1, wherein a switching reference is received from a polling destination. The communication device
2. The communication apparatus according to claim 1, wherein the switching reference is received from an external device other than the polling destination without transmitting a transmission request for the switching reference to the polling destination at each timing when acquisition of the switching reference is required. . The communication device
An instant message client device whose polling destination is an instant message server device,
The communication apparatus according to claim 1, wherein when receiving presence information from the instant message server apparatus, the presence information including a switching criterion is received. The switching reference storage unit is
A switching criterion indicating that polling is performed at a second polling interval when a predetermined monitoring target event has a specific status is stored, and the communication device further includes:
A status information receiving unit for receiving status information for notifying the status of the monitored event;
The polling interval instruction unit
It is determined whether or not the status of the monitored event indicated in the status information matches the specific status indicated in the switching criterion, and if both do not match, the first polling execution unit is informed The communication apparatus according to claim 2, wherein polling at a polling interval is instructed, and if both match, the polling execution unit is instructed to poll at a second polling interval. A polling execution step capable of performing polling at any one of a first polling interval and a second polling interval different from the first polling interval;
It is determined whether or not a switching criterion for switching between the first polling interval and the second polling interval is satisfied, and when the switching criterion is satisfied, the first polling interval and the second polling interval A polling interval instruction step for instructing the polling execution step to switch between two polling intervals. A polling execution process capable of performing polling at any one of a first polling interval and a second polling interval different from the first polling interval;
It is determined whether or not a switching criterion for switching between the first polling interval and the second polling interval is satisfied, and when the switching criterion is satisfied, the first polling interval and the second polling interval A program for causing a computer to execute polling interval instruction processing for instructing the polling execution processing to switch between two polling intervals.

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