JP2010170182A - Data display device and data display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device displaying data at high speed when sequentially displaying data on state monitoring of a plant facility, or a state change of rainfall, a water level of a river, or the like. <P>SOLUTION: This data display device 100 is connected with a data accumulation device 50 via a network, and includes a browser function means 30 displaying the display target data accumulated in the data accumulation device 50. In the data display device 100, a browser cache decision part 5 inside the browser function means 30 decides presence/absence of storage of the data of a display target required by a user inside a browser cache area 4, and when the data is absent, the data display is speeded up by acquiring the data from an application server 40 inside the data accumulation device 50. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus for displaying data and graphs of rainfall and river water level changes for each time, and in particular, has browser function means and a server and temporarily stores display target data acquired from the server on a browser cache. Only the difference data that is newly required at the time of data update is acquired from the server, and the display target data that has already been acquired relates to a device that displays the data acquired from the browser cache.

Conventionally, a graph data display method has been used as a method for visually monitoring state changes of plant facilities and public facilities, or state changes such as rainfall and river water level in time series. Furthermore, state monitoring by a trend graph that collects data at a predetermined cycle and automatically updates the graph is widely used in the field of monitoring and control. Since the state monitoring by the graph display sometimes monitors a critical object in the business, it is necessary to draw the graph as fast as possible in response to the graph drawing request. In addition, due to the recent flow of information disclosure, it is necessary to have a mechanism for confirming the monitoring status to an unspecified number of people, and it is indispensable for the system to support Web distribution, that is, to network the entire system including the Internet. Yes.
As an example of the trend graph display method for the conventional requirement, there is disclosed a system including a cache memory between a hard disk for storing collected data and a display buffer for storing a part of the collected data (Patent Document 1). ).

Japanese Patent Laid-Open No. 05-107082

  However, in the technique disclosed in Patent Document 1, the data cache mechanism is realized in its own device. However, when networked, the amount of data communication between the devices and the processing time are considered. As a result, the graph display time is delayed as a result, and there is a problem that performance requirements required for data display at the time of quick information provision countermeasure planning in the case of heavy rain can not be satisfied.

  The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a data display device connected via a network and capable of displaying data at high speed.

  A data display device according to the present invention comprises browser function means connected to a data storage device via a network and displaying display target data stored in the data storage device on a screen. A browser rendering engine that performs calculations for visualizing data, a browser cache area that temporarily stores display target data acquired from a data storage device, and a display data processing unit that acquires the indicated display target data and outputs it to the browser rendering engine For one or more display target data requested by the display data processing unit, if the display target data exists in the browser cache area, the display target data acquired from the browser cache area is returned to the display data processing unit and exists. If not, display from data storage device Get the elephants data, and has a browser cache determination unit that stores the browser cache area with return display target data acquired in the display data processing unit.

  The data display system according to the present invention includes a data storage device, and a data display device having browser function means for displaying display target data acquired from the data storage device via a network on a screen. Browser rendering engine that performs calculations to visualize display target data, browser cache area that temporarily stores display target data acquired from the data storage device, and display data that acquires the specified display target data and outputs it to the browser rendering engine If the display target data exists in the browser cache area for the processing unit and one or more display target data requested by the display data processing unit, the display target data acquired from the browser cache area is returned to the display data processing unit. If not, An application for acquiring display target data from a storage device, returning the acquired display target data to a display data processing unit and storing the display target data in a browser cache area, the data storage device storing display target data A server, a Web cache area for temporarily storing display target data returned in response to a data acquisition request from the browser function means, and one or more display target data requested to be acquired from the browser function means in the Web cache area If the display target data is present in the Web cache area, it is acquired from the Web cache area. If the display target data is not present, it is acquired from the application server, returned to the browser function means, and stored in the Web cache area. It is that a server.

  The data display device according to the present invention is a device configured as described above, and only the display target data that does not exist in the browser cache area is acquired from the storage device, so that the amount of communication through the network is reduced. This makes it possible to increase the speed of data display.

  In addition, since the data display system according to the present invention is a system having the above-described configuration, it has the same effect as described above, can suppress concentration of access to the application server of the data storage device, and can reduce the load. The data display speed can be increased, and the data display performance can be improved as a whole.

It is a block diagram which shows the data display apparatus by Embodiment 1 of this invention. It is a figure which shows the flowchart of the data display apparatus by Embodiment 1 of this invention. It is a block diagram which shows the data display apparatus by Embodiment 2 of this invention. It is a figure which shows the flowchart of the data display apparatus by Embodiment 2 of this invention. It is a figure which shows the data display apparatus by Embodiment 3 of this invention. It is a figure which shows the flowchart of the data display apparatus by Embodiment 3 of this invention. It is a figure explaining acquiring in the data display device by Embodiment 3 of this invention only the difference data which do not exist in a data buffering area among display object data via a communication part. It is a figure explaining that the data representation format of the display object data which a display data process part inputs in the data display apparatus by Embodiment 4 of this invention and the display object data which are output is the same.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
In FIG. 1, a data display device 100 is connected to a data storage device via a network and includes browser function means for displaying display target data stored in the data storage device on a screen. The data display device 100 according to the first embodiment displays data acquired from the application server 40 provided in the data storage device 50 via a network on a trend graph, for example, and serves as a data display terminal as a browser Functional means 30 are provided.
The browser function means 30 is a browser rendering engine 7 that performs a calculation for visualizing data so that the requested content can be displayed on the screen, an input unit 8 that receives input from the user, and data to be displayed on the application server 40. Browser communication control unit 6 that performs transfer, browser cache area 4 that stores display target data received from the application server 40, and browser cache determination that determines whether or not display target data exists in the browser cache area 4 The unit 5 and the display data processing unit 20 that performs processing necessary for displaying data. The display data processing unit 20 requests the browser rendering engine 7 to display data such as dotted lines, images, characters, and the like, and the line type, color, and thickness for the rendering request unit 1. The main unit 2 transmits attribute information necessary for graph display, such as drawing type information and image display position information, and the communication unit 3 that requests and acquires display target data. The application server 50 includes a request processing unit 9 that processes a request received via a network, and a display target data storage area 10 that stores various types of data necessary for graph drawing.

Next, the operation will be described with reference to a flowchart.
In FIG. 2, for example, when a graph is displayed, a graph drawing request is first transmitted to the input unit 8 (ST1). The browser input unit 8 transmits the received graph drawing request to the main body unit 2 in the display data processing unit 20 (ST2). Receiving the graph drawing request, the main unit 2 determines one or more instructed display target data, and transmits a display target data acquisition request to the communication unit 3 (ST3). The transmitted display target data acquisition request is passed to the browser cache determination unit 5 via the communication unit 3, and the browser cache determination unit 5 determines whether display target data is stored in the browser cache area 4. (ST4). Here, for the display target data stored in the browser cache area 4, the browser cache determination unit 5 acquires the data and temporarily stores it in the browser cache determination unit 5 (ST5). For display target data that could not be acquired from the browser cache area 4, a data acquisition request is transmitted from the browser cache determination unit 5 to the browser communication control unit 6 and transmitted to the application server 40 of the data storage device 50 via the network. (ST6). The data acquisition request received by the application server 40 is processed by the request processing unit 9 into, for example, graphing or numbering, and then stored in the display target data storage area 10, and the processed data or processing is processed. For the stored data that is not required, a response including the display target data acquired from the display target storage area 10 is returned to the browser communication control unit 6 by the request processing unit 9 via the network (ST7). The browser communication control unit 6 that has received the response transfers the response to the browser cache determination unit 5 (ST8). The browser cache determination unit 5 acquires display target data from the response and stores it in the browser cache area 4 (ST9).

Next, the display target data temporarily stored in ST5 and the display target data of ST8 acquired via the network are collectively transmitted to the main unit 2 via the communication unit 3. At this time, the communication unit 3 transfers the display target data to the main unit as it is without processing or the like (ST10). The main unit 2 shapes the display target data into a form suitable for graph drawing, and transmits the data to the rendering request unit 1 (ST11). Finally, the rendering request unit 1 transmits graph drawing information to the browser rendering engine 7, and the graph is displayed by the browser rendering engine 7 (ST12, ST13). If there is an end request in ST14, the process returns to ST1 again, and the process ends without an end request.
In ST4, if all data exists, only data is selected, and if all data does not exist, only no data is selected. When some data exists and the remaining data does not exist, “present data” is selected for existing data, and “no data” is selected for non-existent data. In ST5, when a data acquisition request is made to the WEBAP server, data that does not exist in the browser cache area are collectively requested. However, if the processing cannot be performed with one packet due to the capacity restriction of the data acquisition request packet, the processing is divided into a plurality of packets.

  Since the data display device 100 according to the first embodiment displays a graph using the browser cache function in a system connected via a network, the display target data is acquired via the network for each graph request. The number of times can be reduced, enabling high-speed graph display.

Embodiment 2. FIG.
In the second embodiment, a Web server 70 is provided in the data storage device 50 of the first embodiment. Between the browser function means 30 and the application server 40 in FIG. A web server 70 is provided as shown in FIG. After receiving the data acquisition request transmitted from the browser function means 30 via the network, the Web server 70 determines whether the corresponding data is cached, acquires the data from the cache, and acquires the request to the application server 40. A Web cache unit 11 that performs transfer and a Web cache area 12 that stores data cached by the Web cache unit 11 are provided. In the second embodiment, in addition to the first embodiment, by providing a data cache mechanism on the network, the concentration of access to the application server 40 can be suppressed and the load can be reduced. In addition, the data transmitted by the communication control unit 6 Since the response speed to the acquisition request can be increased, the data display performance can be improved as a whole.

Hereinafter, the operation will be described with reference to the flowchart of FIG. Note that the ST numbers shown in FIG. 2 of the first embodiment and the ST numbers shown in FIG. 4 of the second embodiment are the same.
Since operations ST1 to ST5 from the browser input unit 8 to the browser cache determination unit 5 are the same as those in the first embodiment, description thereof is omitted. When it is determined in ST4 that there is no data, when the display target data acquisition request is transmitted from the browser cache determination unit 5 to the browser communication control unit 6, the browser communication control unit 6 displays the display target data to the Web server 70. An acquisition request is transmitted (ST41). The Web server 70 checks whether or not the corresponding display target data is stored in the Web cache area 12 via the Web cache unit 11, and if stored, acquires the display target data from the Web cache area 11 and then performs communication control. It returns to the part 6 (ST42, ST43). For display target data that is not stored, a data acquisition request is transferred to the application server 40, the display target data is acquired from the application server 40 in the same manner as in the first embodiment, and the acquired data is stored in the Web cache area 12. And then sent back to the communication control unit 6 (ST6, ST7, ST44, ST45). Since ST8 to ST14, which are operations after the communication control unit 6 that has received the reply, are the same operations as those in the first embodiment, description thereof is omitted. Note that the presence / absence of data in ST42 is the same processing as ST4 described above.

  In the second embodiment, when a large number of data acquisition requests are simultaneously transmitted to the application server 40 in the first embodiment, if the data is cached in the Web server 70, the application server 40 is notified. Therefore, it is possible to prevent a decrease in the performance of the application server 40, improve the response speed, and improve the data display speed as a whole.

Embodiment 3 FIG.
In the third embodiment, as shown in FIG. 5, a data buffering area 13 is added to the display data processing unit 20 shown in FIG. The data buffering area 13 has an area sufficiently larger than the number of data required at the time of graph drawing, and can hold data other than display target data at the time of drawing request in advance. The importance of providing this data buffering area 13 is that the data display performance is improved by the fact that data acquisition processing can be performed within the display data processing unit 20 without acquiring data from the browser cache area 4 or the data storage device 50. It is in.

Hereinafter, the operation will be described based on the flowchart of FIG.
When receiving the graph display request, the browser input unit 8 transmits the received request to the main body unit 2 (ST1). The main body 2 checks whether or not display target data corresponding to the data buffering area 13 is stored for the data required for graph drawing from the received request (ST31). Here, the main unit 2 obtains the display target data stored in the data buffering area 13 from the data buffering area 13 (ST32), and requests the data obtaining request to the communication unit 3 for those not stored. Is transmitted (ST2).

  FIG. 7 shows a diagram for explaining that only the difference data that does not exist in the data buffering area among the display target data is acquired via the communication unit in the data display device according to the third embodiment of the present invention. When 10 data items A to J are requested, the main body 2 checks whether data items A to J exist in the data buffering area 13. Since five data B, D, F, H, and I exist in the data buffering area 13, they are acquired. The five data A, C, E, G, and J are differential data that does not exist in the data buffering area 13, and the acquisition of these differential data is requested via the communication unit 3. When the data of A, C, E, G, and J can be acquired, the data is stored in the data buffering area 13 and the 10 data of A to J are combined with the data of B, D, F, H, and I. On the other hand, processing for converting the data expression format into data of a, b, c, d, and e is performed and output to the browser rendering engine 7.

The data display device 100 according to the third embodiment can reduce the number of display target data acquisition requests from the display data processing unit 20 when, for example, switching between the most recent past state and the current state for display. In addition, since there is a case where processing up to data acquisition can be performed in the display data processing unit 20, the response speed is improved and the data display speed is improved as a whole.
Furthermore, the data display device 100 according to the third embodiment obtains only the display target data of the latest time via the communication unit 3 when the graph is updated in time series at a predetermined time interval, for example. In addition, since the remainder only needs to be acquired from the data buffering area 13, it is not necessary to acquire all the data from the communication unit 3 every time the display is updated, so that the display performance is improved. Further, when data is acquired via the communication unit 3, even if data is not stored in the browser cache area 4 and data acquisition from the data storage device 50 via the network is necessary, the minimum data acquisition is possible. Therefore, even if the network is a narrow band, it is possible to prevent performance degradation.

Embodiment 4 FIG.
In the fourth embodiment, display target data is displayed in a graph in the data buffering area 13 of the display data processing unit 20, the browser cache area 4 of the browser function means 30, and the Web cache area 12 in the Web server 70 of the data storage device 50. It is intended to be held in a suitable unit.

Next, the operation will be described. FIG. 8 shows a diagram for explaining that the display target data input by the display data processing unit and the display target data to be output have the same data representation format in the data display device according to the fourth embodiment of the present invention.
The flow of operations from when a graph display request is sent to the browser function means 30 until the graph is displayed by the browser rendering engine 7 is the same as in the third embodiment. However, the display data processing unit 20 outputs display target data items a to j to the browser rendering engine 7 without converting the data expression format. Therefore, the data representation format of the display target data stored in the data buffering area 13, the browser cache area 4, and the data storage device 50 is the same as the data representation format of the display target data input to the browser rendering engine 7. That is, it is possible to draw a graph without processing the display target data.

  As a result, the process of converting the display target data into the information for graph drawing can be omitted, so that the graph drawing speed is improved as a whole. Furthermore, since unnecessary data is not handled at the time of graph drawing, the resource consumption of the data display apparatus 100 can be reduced.

  INDUSTRIAL APPLICABILITY The present invention relates to monitoring of plant facilities and public facilities, and is effective in confirming the status of a monitoring target provided far away via a network by displaying data, particularly in a graph.

2 main unit, 4 browser cache area, 5 browser cache determination unit,
7 browser rendering engine, 8 input section, 9 request processing section,
10 display target data storage area, 11 Web cache means,
12 Web cache area, 13 Data buffering area,
20 display data processing unit, 30 browser function means, 40 application server,
50 data storage device, 60 user input, 100 data display device.

Claims (6)

A data display device comprising browser function means connected to a data storage device via a network and displaying display target data stored in the data storage device on a screen,
The browser function means includes
A browser rendering engine that performs calculations to visualize the data to be displayed;
A browser cache area for temporarily storing display target data acquired from the data storage device;
A display data processing unit that acquires the instructed display target data and outputs the data to the browser rendering engine;
For one or a plurality of the display target data requested from the display data processing unit, the display target data acquired from the browser cache area when the display target data exists in the browser cache area A browser cache determination unit that acquires the display target data from the data storage device if it does not exist, returns the acquired display target data to the display data processing unit, and stores the display target data in the browser cache area A data display device characterized by that. The data display device according to claim 1, wherein the browser cache determination unit collectively acquires the display target data that does not exist in the browser cache area from the data storage device. The display data processing unit has a data buffering area for storing the display target data output to the browser rendering engine, and is instructed to display one or a plurality of the display target data instructed to be displayed. It is determined whether the display target data exists in the data buffering area. If the display target data exists, the display target data acquired from the data buffering area is output to the browser rendering engine. 3. The display target data acquired by requesting the display target data instructed to be displayed by the determination unit is output to the browser rendering engine as data. Data display device. The data display apparatus according to claim 3, wherein the display data processing unit collectively acquires the display target data that does not exist in the data buffering area from the browser cache determination unit. The data display according to any one of claims 1 to 4, wherein the display target data input to the display data processing unit and the display target data to be output have the same data representation format. apparatus. A data display system comprising a data storage device and a data display device having a browser function means for displaying display target data acquired from the data storage device via a network on a screen,
The browser function means includes
A browser rendering engine that performs calculations to visualize the data to be displayed;
A browser cache area for temporarily storing display target data acquired from the data storage device;
A display data processing unit that acquires the instructed display target data and outputs the data to the browser rendering engine;
For one or a plurality of the display target data requested from the display data processing unit, the display target data acquired from the browser cache area when the display target data exists in the browser cache area A browser cache determination unit that acquires the display target data from the data storage device and returns the acquired display target data to the display data processing unit and stores it in the browser cache area. And
The data storage device includes:
An application server for storing the display target data;
A Web cache area for temporarily storing the display target data returned in response to a data acquisition request from the browser function means;
If one or more of the display target data requested to be acquired from the browser function unit in the Web cache area is acquired in the Web cache area, the display target data is acquired from the Web cache area and does not exist. A data display system comprising: a Web server having a Web cache unit that is acquired from the application server, returned to the browser function unit, and stored in the Web cache area.

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