JP2003330849A - Server and multiple clients differential report system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem in a conventional system that a plurality of Web terminals cannot receive a differential report at the same time, resulting in the dispersion of updating timing, taking much time to update a content of large size. <P>SOLUTION: An updating method determination function 11 calculates the trade-off between communication cost information from a monitoring function 114 and data size to select an optimum method. Therefore, the screen of a Web browser can be synchronously updated among a number of Web terminals 130. Further, since each Web terminal 130 precedently HTTP-downloads base differential information before the rewrite of information and caches it in an HTTP content cache 132, a large differential content can be synchronized among the Web terminals in real time when reported from a server. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a server / multi-client difference notification system, and more particularly to a web.
A server processing device having a server function and a difference notification function has a large number of webs (We
b) In a large-scale web terminal synchronization system connected to terminals, the present invention relates to a server / multi-client difference notification system that keeps information displayed on the screens of many web terminals the same among terminals.

[0002]

2. Description of the Related Art For example, when a broadcast program of a radio broadcasts detailed information to a viewer in real time by linking the radio broadcast and a large number of web terminals distributed on the Internet, the screens of a large number of web terminals are displayed. It is necessary to synchronize the information displayed on the device in real time and keep the same content between terminals. In such a large-scale web terminal synchronization system, if the latest information of the server processing device having the web server function differs from the information displayed on the web terminal, all the information is updated instead of being reacquired. If you want the web terminal to acquire only where there was,
Difference notification indicating the difference between the latest information of the server processing device and the information displayed by the web terminal is performed.

In this difference notification system, conventionally, web terminals distributed over the Internet, which cannot perform broadcast-type communication such as television, are automatically updated within a fixed time, or meta information notified from a server processing device is used as a trigger. , And the respective web terminals download the difference data from the server processing device.

For example, SMIL (Synchronized Multime)
A meta description language called dia integration language) describes update information of web content, and downloads and displays the web content according to the described schedule. Further, with stream-linked web content, the web content can be updated by using an event notified from the server processing device to each client as a trigger.

[0005]

However, the above-mentioned conventional difference notification system has two problems. The first problem is that a plurality of web terminals cannot receive the difference notification at the same time, and the update timings are different. In the existing method, the method of acquiring the differential content needs to be determined by the program distributed in advance to the web terminal side, and it is not possible to divide the case depending on the size of the differential content that dynamically changes on the server processing device side. The optimum update method depending on the size of the can not be selected, and the update timing is disturbed among a plurality of web terminals.

The second problem is that it takes time to update a large size content. When the size of content becomes large and the number of web terminals increases, the difference acquisition transactions occur in bursts in the server processing device, resulting in congestion, and finally the update timing shifts for each web terminal. Will end up.

The present invention has been made in view of the above points,
Select the optimal update notification method from the size of update data,
Sending difference data directly, HTTP download command notification,
A server that can consistently perform updates from large difference data to small difference data by updating screens in real time between multiple web terminals and realizing screen synchronization by any of the preceding HTTP download command notifications. An object is to provide a multi-client difference notification system.

Another object of the present invention is to provide a server / multi-client difference notification system capable of synchronizing in real time between web terminals even when a large difference content is notified from a server to a web terminal.

[0009]

In order to achieve the above object, the present invention provides a server processing apparatus having a web server function and a difference notification function, which is connected to a plurality of web terminals which are a plurality of clients. In the multi-client difference notification system, the server processing device includes a first storage unit that stores a first difference update command that is predetermined by time, and a second storage unit that stores the content whose difference is to be updated. A storage means and an input means for inputting the second difference update command whose time cannot be determined in advance or the first difference update command from the first storage means are attached.
A plurality of types prepared in advance based on the monitoring function for monitoring the communication cost, the data size specified by the first or second difference update command input from the input means, and the communication cost monitored by the monitoring function. Update method that determines the most suitable update method from among the update methods, the update control function that creates update notification data that indicates the update method that was determined by the update method determination function, and the update that is input from the update control function Transfer notification data to multiple web terminals,
Based on the difference notification function of notifying the communication cost of the monitoring function and reflecting it in the update method determination by the update method determination function, and the update method determined by the update control function, the content of the difference target is sent from the second storage means. And a server function for downloading to a plurality of web terminals, and each of the plurality of web terminals uses the difference data of the update notification data or the server function according to the update method indicated by the update notification data received from the server processing device. It is configured to have means for acquiring difference data by HTTP download and updating the content.

In the present invention, the update method determining function calculates a trade-off between the communication cost information from the monitoring function and the data size designated by the first or second update notification data, and prepares a plurality of types prepared in advance. From among the update methods, we have selected the best update method to synchronize the screens of many web terminals in real time, so by updating the screen of the web browser in synchronization with many web terminals,
The first purpose can be achieved.

Here, the above-mentioned update method determination function of the present invention is, as a plurality of types of update methods, the difference selected when the data size is smaller than the first threshold and the total communication cost is smaller than the second threshold. Differential data normal HTTP download command notification selected when data is directly sent, when the data size is equal to or greater than the first threshold and the total communication cost is equal to or greater than the second threshold, and when the update time has a margin Advance download command notification of difference data and normal H
There are three types of combination of TTP download command notification, and when the difference data direct transmission is selected, the difference data of the update notification data is transmitted to the web terminal, and the difference data is normally HTTP.
When the download instruction notification or the advance download instruction notification of the difference data is selected, the content of the difference target is sent from the second storage means to the server processing device and then downloaded to the web terminal.

In order to achieve the above-mentioned object of the present invention, each of the web terminals receives the update notification data transferred from the server processing device, and has a differential update function for analyzing the update method in the update notification data. Has a download function for obtaining difference data from the server processing device by HTTP download, and a web browser display means,
If the update method in the received update notification data is the difference data direct delivery, the difference update function notifies the web browser display means of the difference data in the update data to update the content, and the update method is other than the difference data direct delivery. In the case of,
By the HTTP download function, the differential content is acquired from the server processing device by HTTP download, and if the update method is a differential data normal HTTP download command notification, the differential content is downloaded and then notified to the web browser display means to display the content. If it is updated and already stored in the HTTP content cache, the content of the HTTP content cache is used without downloading, and if the update method is a differential data preceding HTTP download command notification, after downloading the differential content, It is configured to be stored in the HTTP content cache.

According to the present invention, the download function in the web terminal HTTP downloads the difference data from the designated URL based on the difference data preceding HTTP download instruction notification, and the HTTP content cache is downloaded prior to the download instruction notification at the same URL. Since the difference data stored in the can be displayed by the web browser display means, it is possible to update the difference only with a simple instruction set, and if the preceding download is not completed in time, the download command Processing can be switched to notification.

That is, according to the present invention, before the information is rewritten on the Web terminal, the difference information serving as the base is HTTP-downloaded in advance of the difference information,
The update method determination function automatically designates a two-step update method in which information that is cached in the HTTP content cache of the web terminal and that is rewritten in real time is transmitted from the server processing device at the update time. Can achieve the purpose.

Further, according to the present invention, in order to achieve the above-mentioned object, each of the plurality of web devices has a difference data precedence H.
TTP download command notification or difference data Normal HT
With respect to the difference data updated by the TP download command notification, the partial correction in the updated area is corrected by using the difference data direct transmission.
Even for contents that require a large amount of communication, it is possible to send a large area first and instantaneously update a small partial area of the content that requires real-time processing.

In order to achieve the above-mentioned object, the present invention provides a plurality of difference notification functions of the server processing device when the update method of update notification data to be transferred to a plurality of web terminals is difference data direct transmission. If the update method of the update notification data is the difference data HTTP download instruction notification or the difference data preceding download instruction notification, the communication among the plurality of web terminals is performed. Since the data is transferred in order from the web terminal with the higher speed, the real-time property of synchronization between the web terminals can be improved when the differential data is directly sent, and the differential data HTTP download command notification and the differential data preceding download command are issued. In the notification, the load of the server function in the server processing unit that downloads the difference data HT on the communication path with be distributed
The probability of hitting the TP cache can be improved, and the real-time property of updating the differential content can be improved.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a server according to the present invention.
FIG. 2 is a system configuration diagram of an embodiment of a multi-client difference notification system, and FIG. 2 is a configuration diagram of an example of data used in the system of FIG. A configuration of an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, the server / multi-client difference notification system of the present embodiment includes a server processor 110 and an HTTP (Hypertext Transfer Protocol).
The cache device 120 and a plurality of web terminals 130 are generally configured. The server processing device 110 is provided with an update instruction unit 116, an update schedule 117 and an HTTP content 118. In addition, each of the web terminal devices 130 has an HTTP content cache 134.
Is included. Also, as shown in FIG. 1, a large number of web terminal devices 130 are distributed over the Internet.
Furthermore, it is assumed that the HTTP cache device 120 exists on the Internet. Server processing device 1
10 and the web terminal device 130 are connected by the Internet.

The server processing device 110 has an update method determination function 111, an update control function 112, a difference notification function 113,
It has a communication cost monitoring function 114 and a web server function 115. Further, among the update instruction means 116, the update schedule 117 serving as a storage device, and the HTTP content 118 attached to the server processing device 110, the update schedule 117 includes a differential update indicating a time and an update method for updating the HTTP content 118. A plurality of commands 210 are stored.

That is, the update schedule 117 stores the difference update command 210 which is predetermined by time, and the difference update command 21 whose time is not predetermined is stored.
0 is input from the update instruction means 116. In the HTTP content 118, the content to be differentially updated is HT.
It is stored in ML (Hypertext Markup Language) or binary format. The update instruction means 116 is an input means for creating the difference update command 210 in parallel with the update schedule 117 at an arbitrary timing.

The update method determination function 111 acquires the HTTP content 118 which is the difference information of the difference update based on the update schedule 117 or the difference update command 210 transferred from the update instruction means 116, and the communication cost monitoring function 114 Based on the communication cost you are monitoring,
Determine the best update method.

Here, the difference update command 210 will be described. As shown in FIG. 2A, the difference update command 210 includes an update method 211, an update time 212, a difference area ID 213, a data type 214, and difference data 215. Also, as an option, the second stage difference area ID
216 and the second stage difference file 217 are included. The update method 211 is “automatic selection”, “send difference data directly”,
"Notification of difference data normal HTTP download command",
“Notification of HTTP download command for preceding differential data”,
There is a "gradual update". Each method will be described later.

The update time 212 corresponds to the server processing unit 110.
Indicates the time to send update notification data from. The difference area ID 213 has an ID previously designated in the HTML content already displayed on the web terminal device 130 as a portion to be updated, and shows a value equal to one of the IDs in the web terminal device 130. . Data type 214
Indicates the type of difference data 215 that is update information. This type includes text attributes, file attributes, and URs.
There is an L (Uniform Resource Locator) attribute.

The difference data 215 can be directly described by the text attribute. A file stored in an external file can be designated by the file attribute and the URL attribute. The actual status of external files and URLs is HTTP content 11
It is stored as 8. The advantage of text attributes is that they can easily describe small size differential content. The advantage of the file attribute is that it is possible to directly specify a large-sized difference content, and in the case of a small size, the real data portion to be updated from the difference update command 210 can be separated into a file. URL attributes, in addition to the benefits of file attributes, can point to external web server content. Second stage difference area I
The D216 and the second stage difference file 217 are used when the update method 211 indicates "stepwise update".

Returning to FIG. 1 again, the update method determination function 111 indicates the data size designated by the difference update command 210 and the communication cost monitoring function 114 when the update method 211 is “automatic selection”. The optimal update method is determined based on the communication cost. That is, when the data size is smaller than the first threshold value and the total communication cost is smaller than the second threshold value, “direct transmission of difference data” is selected. Further, when the data size is equal to or larger than the first threshold and the total communication cost is equal to or larger than the second threshold, "difference data normal HT
"TP download command notification", and in that case, if there is grace by the actual update time, "difference data precedent HTTP"
Select "Download command notification".

In the "differential data direct transmission", all the data can be transmitted by one communication of the update notification data 220, so that the whole throughput is fast. On the other hand, the method of downloading separately via HTTP is the update notification data 220.
In addition, since HTTP transactions are required, throughput is slow. Choose the faster one with this trade-off.

The update control function 112 uses the difference update command 210 to update the notification data 22 having the configuration shown in FIG.
0 is created and HTT is added to the web server function 115.
Send the P content 118 and prepare for download.
The update method 221 in the update notification data 220 is designated by the update method determination function 111. Further, the difference area ID 222 in the update notification data 220 is the difference area ID 213 of the difference update command 210 or the second stage difference area I.
Copy D216. The difference data 223 in the update notification data 220 is the difference data 215 or HTTP.
It is the URL of the content 118 or the difference data.

That is, when the data type 214 in the difference update command 210 has the text attribute, the update information is stored as text. Therefore, if the update method is "difference data direct transmission", the difference data 215 will be displayed in FIG. It is copied to the difference data 223 in the update notification data 220 shown in B). If the update method is other than "Send difference data directly",
The text difference data 215 is converted into a file and stored in the web server function 115. The difference data 223 at this time becomes the URL of the difference data stored on the web server function 115.

Data type 2 in difference update command 210
When 14 has a file attribute, the update information is stored as a file in the HTTP content 118. Therefore, if the update method is “direct transmission of difference data”, the HTTP content 118 is copied to the difference data 223. If the update method is other than “send differential data directly”, the HTTP content 118 is stored in the web server function 115 as it is.
The difference data 223 at this time is the web server function 11
It will be the URL of the difference data placed above 5.

Data type 2 in the difference update command 210
When 14 has the URL attribute, the difference file already exists on the web server. If the update method is “send differential data directly”, the HTTP content 118 is downloaded and copied to the differential data 223. If the update method is other than “send difference data directly”, the URL of the difference data is copied to the difference data 223. At this time, if the URL is a relative path, it is converted to an absolute path.

The difference notification function 113 is an update control function 11
The update notification data 220 input from 2 is transferred to the difference update function 131 of the web terminal device 130. Further, the difference notification function 113 notifies the communication cost to the communication cost monitoring function 114 and reflects it in the determination of the update method. The difference notification function 113 includes a large number of web terminal devices 13.
0 is connected and the transmission order is update method 221.
In the case of “Send difference data directly”, the web terminal device 130 having a slow communication speed sends the data in order. On the other hand, when the update method 221 is other than “send differential data directly”, the web terminal device 130 having a faster communication speed sends the data in order.

In the "direct transmission of difference data", the screens can be updated at the same time among a large number of web terminal devices 130 as much as possible. In addition to the “direct transmission of difference data”, when a large number of transactions are generated from a large number of web terminal devices 130, a cache hit can be made to the HTTP cache device 120, the load on the web server function 115 is reduced, and as a result, In addition, the real-time property of updating the differential content is improved.

The web terminal device 130 uses the difference update function 13
1, an HTTP download function 132, a web browser display unit 133, and an HTTP content cache 134 attached.

The difference update function 131 is used by the server processor 1
When the update notification data 220 transferred from the difference notification function 113 in 10 is received and the update method 221 in the update notification data 220 is “send difference data directly”,
The difference data 223 is notified to the web browser display means 133 to update the content. If the update method 221 is other than “send differential data directly”, it is HTTP download, so the differential update function 131 transfers control to the HTTP download function 132.

The HTTP download function 132 acquires the differential content from the web server function 115 by HTTP download. If the update method 221 in the update notification data 220 transferred from the difference notification function 113 is “difference data normal HTTP download command notification”, the HTTP download function 132 notifies the difference update function 131 after downloading the difference content. Then, the difference update function 131 notifies the web browser display unit 133 to update the content.

If the content is already stored in the HTTP content cache 134, the web server function 1
The contents of the HTTP content cache 134 are used without being downloaded from 15. "Difference data precedent H
In the case of “TTP download command notification”, the differential content is downloaded and then stored in the HTTP content cache 134.

Next, the flow of operation in the present embodiment will be described mainly using the flowcharts of FIGS. 3 and 4. FIG. 3A is a flowchart for explaining the operation of the update method determination function 111 for determining the update method. When the difference update command 210 is input (step 310), the update method determination function 111 determines the update method 211 (step 311), and if the update method 211 is not “automatic selection”, follows the designation. A difference updating method is selected (step 312).

On the other hand, when the update method 211 is "automatic selection", the trade-off between the data amount and the communication overhead is calculated (step 313). Update method determination function 111
When the calculation result shows that the data size is small and the total communication cost is small, “direct transmission of difference data” is selected (step 315). As a result of the calculation, if the data size is equal to or larger than the first threshold and the total communication cost is equal to or larger than the second threshold, the HTTP download other than the “differential data direct transmission” is performed.

Here, the "direct transmission of difference data" allows all the data to be transmitted by one communication of the difference notification data 220, so that the overall throughput is fast. On the other hand, HT
The method of separately downloading via the TP requires an HTTP transaction in addition to the difference notification data 220, so the throughput is slow. This tradeoff selects the one with the faster total.

Therefore, in the case of HTTP download, first, it is determined whether or not there is a grace period until update (step 314). The update time 212 is compared with the current time, and if the time difference is the same or the communication speed indicated by the communication cost monitoring function 114 is less than the minimum transfer time of HTTP download, the control is moved to step 317. If so, control is passed to step 316.

In step 316, the differential data preceding HTT
The P download command is notified, and a large number of web terminal devices 130 start HTTP download. If the current time reaches the update time 212, step 3
Control is transferred to 17. In step 317, it is already HTT
If the P content cache 134 has all difference information or halfway difference information and there is all difference information,
Immediately display it on the screen, and if there is difference information up to the middle, download the rest and display it.

Next, the operation when the update method 211 of the difference update command 210 input to the update method determination function 111 is "stepwise update" will be described with reference to FIG. The update method determination function 111 selects the difference update method specified in step 312, and the difference update method is assumed to be "gradual update" (step 32).
0). In this step 320, a large difference area serving as a base is sent in advance, and a part of the update area requiring real-time property is transferred to the update time question in the difference area serving as the base to update the big difference area. It has been shown to improve real-timeness.

In the difference update command 210, the base area is the difference area ID 213 and the base data is the difference data 21.
Stored in the file indicated by No. 5 and specifying the data area requiring real-time property in the base area I
D is stored in the second stage difference area ID 216, and the updated data is stored in the file indicated by the second stage difference file 217.

When the update method determination function 111 determines that the differential update method is "stepwise update", the base portion is stored in the HTTP content cache 134 of each web terminal device 130 by the differential data precedent HTTP download command notification. (Step 321), update time 2
Wait until 12 is the current time (step 32)
2).

By the end of the standby, the second stage difference area ID2 is stored in the file indicated by the second stage difference file 217.
Fill in the data required for 16 updates. Normally, the operation of always writing the latest data to the file indicated by the second stage difference file 217 is performed. When the waiting ends, the latest data is acquired from the file (step 323).
Subsequently, in order to display the base portion notified in advance in step 321, the difference data HTTP download command of the base portion is notified (step 324).

Then, in each web terminal device 130, the HT
The base area is acquired from the TP content cache 134 and displayed on the web browser display unit 133. Then, it operates immediately after the notification in step 324, and notifies the real-time updating section of the update by directly sending the difference data (step 325).

According to the above flow, three update notifications are automatically issued from one difference update command 210, and only a part of the data can be replaced just before the update time, and the difference update of a large area is possible. Becomes

Next, the operation when the update method 211 of the difference update command 210 input to the update method determination function 111 is "difference data normal HTTP download command notification" will be described with reference to FIG. The update method determination function 111 selects the difference update method specified in step 312, and it is assumed that the difference update method is "difference data normal HTTP download command notification" (step 330).

Then, the update control function 112 creates the update notification data 220 having the configuration shown in FIG. 2B from the difference update command 210, and the web server function 115.
The HTTP content 118 is sent to and prepared for downloading. Update method 22 in the above update notification data 220
1 is designated by the update method determination function 111. Further, as the difference area ID 222 in the update notification data 220, the difference area ID 213 or the second stage difference area ID 216 of the difference update command 210 is copied (step 331).

Then, the URL of the update data is stored in the difference data 223 in the update notification data 220 (step 332). The difference notification function 113 is the update control function 11
The update notification data 220 input from 2 is transferred to the difference update function 131 of the web terminal device 130 (step 333).

The difference update function 131 uses the update notification data 2
When 20 is received, the update method 221 in the update notification data 220 is other than “send difference data directly”, and HT
Since it is a TP download, the HTTP download function 1
Control is transferred to 32. As a result, the HTTP download function 132 sends the difference content to the web server function 11
Obtained by HTTP download from step 5 (step 33)
4).

At this time, if all have already been downloaded to the HTTP content cache 134, step 3
Move to 35. HTTP content cache 134
If it has been downloaded halfway through, it will continue to be downloaded. In step 335, based on the notification from the HTTP download function 132, the difference update function 131 notifies the web browser display unit 133 to update the content.

Next, the operation when the update method 211 of the difference update command 210 input to the update method determination function 111 is "difference data preceding HTTP download command notification" will be described with reference to FIG. The update method determination function 111 selects the difference update method specified in step 312, and it is assumed that the difference update method is "difference data preceding HTTP download command notification" (step 340).

Then, the update control function 112 creates the update notification data 220 having the configuration shown in FIG. 2B from the difference update command 210, and at the same time, the web server function 115.
The HTTP content 118 is sent to and prepared for downloading. Update method 22 in the above update notification data 220
1 is designated by the update method determination function 111. Further, as the difference area ID 222 in the update notification data 220, the difference area ID 213 or the second stage difference area ID 216 of the difference update command 210 is copied (step 341).

Subsequently, the URL of the update data is stored in the difference data 223 in the update notification data 220 (step 342). The difference notification function 113 is the update control function 11
The update notification data 220 input from 2 is transferred to the difference update function 131 of the web terminal device 130 (step 343). When the difference update function 131 receives the update notification data 220, the update method 221 in the update notification data 220 is other than “send difference data directly”,
Since it is HTTP download, control is transferred to the HTTP download function 132. As a result, the HTTP download function 132 transfers the difference data to the web server function 11
5 through HTTP download (step 34)
4). Then, the downloaded difference information is stored in the HTTP content cache 134 (step 34).
5).

Basically, steps 340 to 34
When the series of processes up to 5 is completed, step 330 is started for the same difference information. At this time, since the difference data is stored in the HTTP content cache 134, the difference can be displayed instantly.

Even when the preceding HTTP download is not completed, step 330 is started when the current time reaches the update time 212. At this time, in step 334, the HTTP content cache 134
There is no difference information in, or only part of it is downloaded. In this case, the HT of step 340
TP Download Transaction and Step 334
HTTP transactions are merged, step 34
The end of the HTTP transaction of No. 4 is step 334.
Is the same as the end of the HTTP transaction.

Next, FIG. 4C shows the operation when the update method 211 of the difference update command 210 input to the update method determination function 111 is “send difference data directly”.
Will be explained together. The update method determination function 111 selects the difference update method according to the designation in step 312, and it is assumed that the difference update method is “direct transmission of difference data” (step 350).

Then, the update control function 112 creates the update notification data 220 having the configuration shown in FIG. 2B from the difference update command 210 (step 351). The update method 221 in the update notification data 220 is designated by the update method determination function 111.

The difference notification function 113 is the update control function 11
The update notification data 220 input from 2 is transferred to the difference update function 131 of the web terminal device 130 (step 352). The difference update function 131 receives the update notification data 220 transferred from the difference notification function 113 in the server processing device 110, and updates the update notification data 220.
Since the update method 221 therein is “send difference data directly”, the difference data 223 is displayed in the web browser display means 133.
Is notified to update the content (step 353).

[0061]

EXAMPLES Next, examples of the present invention will be described with reference to FIGS. FIG. 5 shows the contents 430 of a file in which an HTML document example 410 as a difference update target, an HTML document example 420 of difference information, and a second stage of a two-stage difference update are described.
Indicates. There are four DIV tags in the HTML document example 410 that is the difference update target, and each has a unique ID. In this example, the contents of the DIV tag are updated to the difference information of the HTML document example 420 of the difference information at any time. Note that the script language of the difference update program is inserted in the HTML document example 410 to be the difference update target, and exchanged with the difference update function 131.

FIG. 6 shows an example of the difference update command 440. Each line is a differential update command, and the data is separated by a semicolon. From the first item, the schedule number, the update method 211, the update time 212, the difference area ID 213, the data type 214, and the difference data 215. In the case of stepwise update, the second step difference area ID2
16 and the second stage difference file 217.

The updating method is as follows: "DirectSend" is "Send difference data directly", "HTTPDownloa".
"d" is "difference data normal HTTP download command notification", "PreDownload" is "difference data preceding HTTP download command notification", "DoubleSt"
“Ep” is “gradual update”, “Auto” is “automatic selection”
Indicates.

Also, the update notification data 450 shown in FIG.
Is an example of update notification data corresponding to the difference update command 440. Each line is difference notification data, and the line number added for convenience from the first item, the update method 221,
The difference area ID 222 and the difference data 223 are obtained. "Pr
"eDownload" and "DoubleStep" use a plurality of update notification data.

Next, the difference update command 440 will be described in order. inner1.html ~ inner5.h
html is a document based on the difference information 420. re
altime.txt is the content 430 of the file in which the second stage of the two-stage difference update is described.

The schedule number 10 of the difference update command 440 indicates that the difference data is directly sent in order to update the DIVTEST1 tag to <FONT> test success </ FONT><BR> at 12:00:00. ing. The update notification data is number 10.

The schedule number 20 of the difference update command 440 indicates that the difference data is directly sent in order to update the DIVTEST1 tag to <FONT></FONT><BR> at 12:00:10. There is an effect that the contents described in the schedule number 10 become blank. The update notification data is number 20.

The schedule number 30 of the difference update command 440 indicates that the difference data normal HTTP download command is notified in order to update the DIVTEST2 tag to the contents of the file data \ inner1.html at 12:00:20. There is. Update notification data is 3
It is number 0.

The schedule number 40 of the difference update command 440 indicates that a difference data precedent HTTP download command notification is issued to update the DIVTEST2 tag to the contents of the file data \ inner2.html at 13:00:00. . The actual preceding download is performed before 13:00:00, and the update notification data No. 41 is transferred. The start time of the advance notice is determined by giving a certain margin of about several minutes to the transfer time calculated from the minimum communication speed from the communication cost monitoring function 114.

Difference data at 13:00:00 Normal HT
TP download command notification is issued and update notification data 4
Transfer number 2. The 41st and 42nd difference area IDs and difference data have the same contents.

The schedule number 50 of the difference update command 440 automatically selects the update method to update the DIVTEST2 tag to the contents of the file data \ inner3.html at 14:00:00. In this case i
Since the size of nner3.html is large, it indicates that differential data normal HTTP download command notification is performed. The update notification data is number 50.

The schedule number 60 of the difference update command 440 is such that the DIVTEST3 tag is URL http://internet2.com at 15:00:00.
In order to update the contents of /inner4.html, differential data normal HTTP download command notification is performed. URL as it is an absolute path
Is described in the update notification data. The update notification data is number 60.

The schedule number 70 of the difference update command 440 indicates that the difference data normal HTTP download command is notified in order to update the contents of the URL inner4.html in the DIVTEST3 tag at 15:00:30. Since the URL is a relative path, the path is added and the URL is described in the update notification data. The update notification data is number 70.

The schedule number 80 of the difference update command 440 is a gradual update. DI at 16:00:00
VTEST4 tag is the contents of URL inner5.html, and realtime. Update the contents of txt. First, for the DIVTEST4 tag, the file d
ata \ inner5. In order to update the contents of HTML, a difference data preceding HTTP download command notification is issued. The issuance time of this command is the preceding time similar to the schedule number 40. The update notification data is number 81.

At 16:00:00, the DIVT
For EST4 tags, the file data \ inner
5. In order to update the contents of html, the difference data normal HTTP download command is notified. The update notification data is number 82. At the time of execution of No. 82, the difference data is often already stored in the HTTP content cache 134 of the web terminal device 130 and can be immediately reflected on the screen. Continuously, for the DIVTEST5 tag,
File realtime. The difference data is directly sent in order to update the contents of txt. The update notification data is number 83. With this difference notification data, the screen “The latest statistical data is 95%” displays the difference information 420.
Can be reflected in a part of.

[0076]

As described above, according to the present invention,
The first effect is to automatically select the optimum update notification method depending on the size of the update content on the server side to enable real-time screen synchronization among many web terminals. The reason is that in the server processing device, the update method determination function calculates the trade-off between the communication cost information from the monitoring function and the update data size, and the optimum update is performed for real-time synchronization of a large number of web terminal screens. This is because the screen of the web browser is updated in synchronization with a large number of web terminals by selecting the method.

The second effect of the present invention is that, when a large difference content is notified from the server, the web terminals can be synchronized in real time. The reason is,
Before the information is rewritten on the web terminal,
The two-step update method is described in which the difference information serving as the base is downloaded in advance by HTTP, cached in the HTTP content cache of the web terminal, and the information that can be rewritten in real time is transmitted from the server processing device at the update time. This is because the update method determination function is automatically specified.

Furthermore, the third effect of the present invention is that the direct transmission of difference data can improve the real-time property of synchronization between web terminals, and the difference data HTTP download instruction notification and the difference data preceding download instruction notification can be performed. That is, it is possible to improve the real-time property of updating the differential content. The reason is that in the case of direct transmission of difference data, the difference data HTT is transferred in order from the web terminal having the slowest communication speed among the plurality of web terminals.
In the case of the P download command notification or the advance download command notification of the difference data, by sequentially transferring from the web terminal having the highest communication speed among the plurality of web terminals,
This is because the load of the server function in the server processing device can be distributed and the probability of hitting the HTTP cache on the communication path can be improved.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an embodiment of the present invention.

FIG. 2 is a data structure diagram of an embodiment of the present invention.

FIG. 3 is a flowchart showing processing up to update notification according to the embodiment of the present invention.

FIG. 4 is a flowchart showing an update notification transfer process according to the embodiment of the present invention.

FIG. 5 is a document structure of an embodiment of the present invention.

FIG. 6 is a difference update command and difference notification data according to an embodiment of the present invention.

[Explanation of symbols]

110 server processor 111 Update method decision function 112 Update control function 113 Difference notification function 114 Communication cost monitoring function 115 Web server function 116 Update instruction means 117 Update schedule 118 HTTP content 120 HTTP cache device 130 Web Terminal 131 Difference update function 132 HTTP download function 133 Web browser display means 134 HTTP Content Cache 210 Difference update command 211 Update method 212 Update time 213 Difference area ID 214 data types 215 Difference data 216 Second stage difference area ID 217 Second Stage Difference File 220 Update notification data 221 Update method 222 Difference area ID 223 Difference data 410 Example of HTML document to be subject to differential update 420 Example of HTML document of difference information 430 2nd stage of differential update 440 Example of difference update command 450 Example of update notification data

Claims (6)

[Claims] 1. A server / multi-client difference notification system in which a server processing device having a web server function and a difference notification function is connected to a plurality of web terminals that are a plurality of clients. A first storage unit that stores a predetermined first difference update command, a second storage unit that stores the content whose difference is to be updated, and a second difference whose time cannot be determined in advance. An update command or an input unit for inputting the first differential update command from the first storage unit is attached, and a monitoring function for monitoring the communication cost, and the first or second input unit input from the input unit. A plurality of types of update methods prepared in advance based on the data size specified by the differential update command and the communication cost monitored by the monitoring function An update method determination function that determines an optimum update method from among them, an update control function that creates update notification data indicating the update method determined by the update method determination function, and the update notification input from the update control function A difference notification function that transfers data to the plurality of web terminals and notifies the communication cost of the monitoring function to reflect the update method determination by the update method determination function, and the update method determined by the update control function. Based on
The second storage means has a server function for sending the difference target content to download to the plurality of web terminals, and each of the plurality of web terminals has the update received from the server processing device. A server / multi-client difference notification system, comprising means for acquiring difference data of the update notification data or difference data by HTTP download from the server function and updating the content according to the update method indicated by the notification data. 2. The update method determining function includes, as the plurality of types of update methods, direct transmission of difference data selected when the data size is smaller than a first threshold and the total communication cost is smaller than a second threshold. , The difference data selected when the data size is equal to or larger than the first threshold and the total communication cost is equal to or larger than the second threshold, and the normal HTTP download command notification and the difference data selected when the update time has a margin The combination of the prior download command notification and the normal HTTP download command notification is sent. When the difference data direct transmission is selected, the difference data of the update notification data is transmitted to the web terminal, and the difference data normal HT is transmitted.
When the notification of the TP download command or the notification of the preceding download command of the difference data is selected, the content of the difference target is sent from the second storage means to the server processing device and then downloaded to the web terminal. The server / plurality client difference notification system according to claim 1. 3. Each of the web terminals receives the update notification data transferred from the server processing device, and a difference update function for analyzing an update method in the update notification data, and the difference data to the server processing device. When the update method in the received update notification data is the direct transmission of the difference data, the difference update function has the download function acquired by HTTP download from The difference data is notified to the web browser display means to update the content, and when the update method is other than the direct transmission of the difference data, the HTTP download function causes the difference content to be acquired from the server processing device by HTTP download. Along with the update method, the difference data is normally HTTP down. If it is a load command notification, after downloading the difference contents, the contents are updated by notifying the web browser display means, and the H
If it is stored in the TTP content cache,
The contents of the HTTP content cache are used without downloading, and the updating method is the difference data preceding HT.
3. The server / multi-client difference notification system according to claim 2, wherein if the notification is a TP download command notification, the difference content is downloaded and then stored in the HTTP content cache. 4. The differential data updated by the differential data preceding HTTP download instruction notification or the differential data normal HTTP download instruction notification is different from each of the plurality of web devices regarding partial correction in the updated area. The server / plurality client difference notification system according to claim 1, wherein the correction is performed by using direct data transmission. 5. The difference notification function of the server processing device,
When the update method of the update notification data to be transferred to the plurality of web terminals is the direct transmission of the difference data, the web terminals having the slowest communication speed among the plurality of web terminals are transferred in order to update the update notification data. When the update method is the difference data HTTP download instruction notification or the advance download instruction notification of the difference data, the web terminals having a higher communication speed among the plurality of web terminals are sequentially transferred. The server / multi-client difference notification system described. 6. The difference data indicated by the update notification data is difference data obtained by copying the difference data indicated by the first or second difference update command, or the URL of the difference data placed on the server function of the server processing device, or The second
2. The server / multi-client difference notification system according to claim 1, wherein the content is the content to be differentially updated from the storage means.