JP5223807B2 - Server device, server-based computing system, and program - Google Patents

Description

  The present invention relates to a server device of a server-based computing system, a server-based computing system, and a server control program.

  In a conventional server-client system, for example, there is a server-based computing system (SBC system) that activates and executes a desired application program on the server device side by remote operation from the client device. In this SBC system, display screen data that is processed and updated by the server apparatus in response to an operation input of the client apparatus is transmitted from the server apparatus to the client apparatus and displayed every time the drawing is updated. . As a result, the client device only needs to have a minimum function such as display and input, and resources such as applications are centrally managed by the server device.

  As described above, since the application program is executed on the server device, the SBC system can realize a highly functional computing environment even when the performance of the client device is low.

  Conventionally, the SBC system is designed on the premise of a high-speed network having no delay such as an in-house LAN (Local Area Network). However, when the amount of screen update data is large or the network communication speed (bandwidth) is low (narrow), the screen data drawn and generated by the server device in response to the operation input of the client device is It takes time until the data is transmitted and transferred to the client device and is completed and displayed as one screen, which causes a problem of poor responsiveness.

  Therefore, in order to improve the user's apparent response in the client device, a screen transfer device that transmits low-quality screen data with a small amount of data at first and then transmits high-quality screen data at intervals is conceivable. (For example, refer to Patent Document 1).

JP 2006-246153 A

  In the conventional screen transfer device, although the apparent response of the screen display according to the user operation in the client device is improved, the total transmission data amount of one screen data increases conversely.

  For this reason, no consideration is given to reducing the total amount of data transmitted from the server device to the client device in response to an input operation from the client device, which contributes to the improvement of the original operation response. There is no problem.

  The present invention has been made in view of such a problem, and reduces the total transmission data amount of screen data drawn and generated in the server device in response to an operation input from the client device to the client device. It is an object of the present invention to provide a server device of a server-based computing system, a server-based computing system, and a server control program that can contribute to an improvement in operation response.

  The server device according to claim 1 executes an application program according to an input event from a client device connected via a network, generates screen information according to the input event, and transmits the screen information to the client device. A server device of a server-based computing system, wherein the amount of data when screen information corresponding to the input event is generated by drawing image data, and the amount of data when generated by drawing parts by a GUI toolkit, A data amount counting means that counts the data amount when the screen information counted by the data amount counting means is image-drawn and a data amount when the component is drawn each time the screen information is updated. Add and store by program type Image / component total data amount storage means, and when generating screen information corresponding to the input event, the image / component total data amount storage corresponding to the type of application program executed in response to the input event A drawing method determining means for determining which one of the total data amount in the case of image drawing stored in the means and the total data amount in the case of component drawing is smaller, and the drawing method determining means Screen information transmission means for generating screen information corresponding to the input event and transmitting the screen information to the client device in accordance with a drawing method.

  The server device according to claim 2 is the server device according to claim 1, wherein the type of the application program includes a Web browser, and the application program executed in response to the input event is a Web browser. In some cases, the amount of data when the image information is drawn and the amount of data when the component is drawn are the above-mentioned screen information added and stored each time the screen information is updated by the image / component total data amount storage means. Stored for each URL of the access destination of the Web browser, and the drawing method determination means corresponds to the URL of the access destination of the Web browser executed in response to the input event when generating the screen information corresponding to the input event. The image drawing stored in the image / component total data storage means Determining any lesser drawing method of the total data amount in the case of total data amount and parts drawing case, it is characterized in that.

  The server-based computing system according to claim 3 has a server device and a client device connected via a network, and follows an application program executed by the server device in response to an input event from the client device. A server-based computing system in which generated screen information is transmitted to the client device and displayed on a display unit, wherein the server device converts screen information corresponding to the input event into image data. A data amount counting unit that counts a data amount when generated by drawing and a data amount when generated by drawing a component by the GUI toolkit, and an image drawing of the screen information counted by the data amount counting unit Draw the amount of data and parts When generating the screen information corresponding to the input event, and the image / part total data amount storage means for adding and storing the data amount in each case for each type of application program each time the screen information is updated, The total data amount in the case of image drawing and the total data amount in the case of component drawing stored by the image / component total data amount storage means corresponding to the type of application program executed in response to the input event A drawing method determination unit that determines which of the smaller drawing methods, and a screen information transmission unit that generates screen information according to the input event and transmits the screen information to the client device according to the drawing method determined by the drawing method determination unit And the client device is transmitted by the screen information transmitting means of the server device. Screen information includes the screen display control means for displaying on the display unit receives the is characterized by.

  The program according to claim 4 is a server that executes an application program in response to an input event from a client device connected via a network, generates screen information in accordance with the input event, and transmits the screen information to the client device A program for controlling a computer of a server device of a base computing system, wherein the computer generates screen information corresponding to the input event by drawing image data, and depending on a GUI toolkit A data amount counting unit that counts the data amount when generated by drawing the component, a data amount when the screen information counted by the data amount counting unit is image-drawn, and a data amount when the component is drawn, Each screen information is updated Image / part total data amount storage means for adding each type of application program and storing it in the memory each time the application program is generated, and the type of application program executed in response to the input event when generating the screen information corresponding to the input event A drawing method determination that determines the drawing method of the smaller one of the total data amount in the case of image drawing and the total data amount in the case of component drawing stored by the image / part total data amount storage means corresponding to According to the drawing method determined by the drawing method determining means, the screen information transmitting means for generating screen information corresponding to the input event and transmitting the screen information to the client device is provided.

  According to the present invention, it is possible to reduce the total transmission data amount of screen data drawn and generated by the server device in response to an operation input from the client device to the client device, thereby contributing to an improvement in the original operation response. A server device of a server-based computing system, a server-based computing system, and a server control program can be provided.

1 is a block diagram showing a configuration of an SBC (Server Based Computing) system according to an embodiment of the present invention. The figure which compares and shows the web pages Pa and Pb before and after the update acquired by the web browser, for example. The figure explaining required data amount by the case where the image drawing of the common image g contained in the web pages Pa and Pb before and behind the update is carried out, and the case where parts are drawn. The figure which compares and shows the application screens Qa and Qb before and after the update produced | generated, for example by a certain application. The figure explaining the data amount required when the menu area | regions ma and mb contained in the application screens Qa and Qb before and after the update are image-drawn. The figure explaining the data amount required when the parts of the menu areas ma and mb included in the application screens Qa and Qb before and after the update are drawn. The block diagram which shows the circuit structure of the server apparatus 10 in the said SBC system. The figure which shows the specific example of the count data in the image / part data amount counter (1) 14d according to URL of the said server apparatus 10. FIG. The figure which shows the specific example of the count data in the image / part data amount counter (1) 14e according to application of the said server apparatus 10. FIG. The block diagram which shows the circuit structure of the client apparatus 20 in the said SBC system. The flowchart which shows the server process by the server apparatus 10 of the said SBC system. 6 is a flowchart showing an encoding data amount counting process of image drawing encoding accompanying a server process of the server apparatus 10; 6 is a flowchart showing an image encoding result data amount counting process accompanying an encoding data amount counting process of the image drawing encoding. 7 is a flowchart showing an encoding data amount counting process of component drawing encoding accompanying the server process of the server apparatus 10; The flowchart which shows the component encoding result data amount count process accompanying the encoding data amount count processing of the said component drawing encoding. 5 is a flowchart showing application drawing method determination processing accompanying server processing of the server device 10; 5 is a flowchart showing URL drawing method determination processing accompanying server processing of the server device 10; The flowchart which shows the server screen display process by the client apparatus 10 of the said SBC system.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an SBC (Server Based Computing) system according to an embodiment of the present invention.

  This SBC system includes a server device 10 and a plurality of thin client devices 20 connected to a network N formed of a wired or wireless LAN (Local Area Network) or WAN (Wide Area Network).

  The server device 10 has a plurality of application programs such as a text creation processing program, a Web browser program, a spreadsheet processing program, and a mail processing program, and an operation input (input event) from the client device 20 connected to the server device 10. ) Start in response to the signal and execute the process.

  In the server device 10, the display output screen data G drawn and generated on the client frame buffer RAM 14a (see FIG. 7) in accordance with the execution of the application program according to the operation input signal from the client device 20 is: It is transferred to the client device 20 of the access source.

  In the client device 20, the screen data G transferred from the server device 10 is expanded in the frame buffer RAM 25 (see FIG. 10) and displayed on the display screen of the display device 26.

  That is, each client device (Thin client) 20 in this SBC system has an input function according to a user operation such as a keyboard and a mouse and an output function to an LCD display unit and a printer as main functions. The server device 10 does not have at least various application functions and data file management functions.

  A data file generated in accordance with various processes activated and executed by the server device 10 in response to an operation input (input event) signal from the client device 20 is basically stored in the server device 10 or the data file. It is stored and stored for each user account or as a shared file in a storage device such as a magnetic disk managed and managed by the server device 10.

  Here, a method for rendering the screen data G generated in the client frame buffer RAM 14a (see FIG. 7) will be described.

  As the drawing method, there are two methods: (A) a drawing method using bit map image data, and (B) a drawing method using a combination of a part and position information in the screen by a GUI toolkit.

  When the screen data G generated in the client frame buffer RAM 14a is transferred to the client device 20 for display, in the case of the drawing method (A), bitmap image data is transferred as it is, and the drawing method In the case of (B), data consisting of parts and position information in the screen is transmitted.

  When the screen data G is updated, for example, when all the contents in the screen are updated to new contents, the drawing method (A) correspondingly updates all the areas in the screen with a new image. It is necessary to draw by data, and even in the drawing method (B), it is necessary to draw by using new parts in all areas in the screen.

  On the other hand, when the screen data G is updated, if the updated screen contains the same content as before the update, the drawing method (A) uses the entire area including the common portion in the screen. While it is necessary to draw as new image data, in the drawing method (B), the common part in the screen is drawn using the parts before update, and new parts are used only in other areas. draw.

  FIG. 2 is a diagram comparing the Web pages Pa and Pb before and after the update acquired by the Web browser, for example.

  FIG. 3 is a diagram for explaining the amount of data required for image drawing and component drawing for the common image g included in the Web pages Pa and Pb before and after the update.

  The pre-update Web page Pa and the post-update Web page Pb include a common image g, but the page Pa before the update includes only the left part thereof in the screen data G, and the page Pb after the update includes the entire image P. Is converted so that is included in the screen data G.

  In order to draw a common image g having a different layout between the Web pages Pa and Pb before and after the update, two image data Ia and Ib corresponding to each layout are required. Only one piece of component data R needs to be changed in the position information within the screen.

  FIG. 4 is a diagram comparing and showing application screens Qa and Qb before and after updating generated by, for example, a certain application.

  FIG. 5 is a diagram for explaining the amount of data necessary for rendering the menu areas ma and mb included in the application screens Qa and Qb before and after the update.

  FIG. 6 is a diagram for explaining the amount of data necessary for drawing parts in the menu areas ma and mb included in the application screens Qa and Qb before and after the update.

  The application screen Qa before the update and the application screen Qb after the update include menu areas ma and mb having different items. In the application screen Qa before update, there is only one item [AAA] partitioned at the left end of the menu area ma, and in the application screen Qb after update, two new items [ GGG] [VVV] is additionally partitioned and inserted.

  In order to draw an image of the menu areas ma and mb having different contents on the application screens Qa and Qb before and after the update, as shown in FIG. 5, a common item [AAA corresponding to the menu areas ma and mb is displayed. ], Two image data Ia and Ib are required. However, in order to draw a component, only the component data R1 to R5 constituting the updated menu area mb are required as shown in FIG.

  For this reason, before and after the screen data G is updated, the amount of data to be transmitted to the client device 20 is larger in the drawing method (B) using the GUI tool kit component as the common portion is included in the screen. This is less than the image drawing method (A).

  Whether or not the screen data G generated by the server device 10 in response to an operation input from the client device 20 includes many common parts before and after the update is determined by the Web page accessed by the Web browser [ A certain tendency (characteristic) appears depending on the type of URL and the type of application to be executed.

  FIG. 7 is a block diagram showing a circuit configuration of the server device 10 in the SBC system.

  The server device 10 includes a CPU 11 as a computer, and a ROM 13, a RAM 14, a frame buffer RAM 15, and a display device 16 are connected to the CPU 11 via a bus 12.

  The CPU 11 is connected to an input device 17 such as a keyboard and a mouse, an external storage device 18, and a communication I / F (interface) 19 with the client device 20 via the bus 12.

  The CPU 11 controls the operation of each part of the circuit by using the RAM 14 or the external storage device 18 as a working memory in accordance with a system program or various application programs stored in the program memory 13a in the ROM 13 in advance. The various programs are activated and executed in response to an input signal or a processing command (input event) signal corresponding to a user operation from the client device 20 received via the communication I / F 19.

  In this server device 10, various data generated in accordance with an application program activated / executed in response to an input event signal from the client device 20 is stored in the external storage device 18 in association with the user ID, for example. . The screen data G for client display is generated using the client frame buffer RAM 14a in the RAM 14, and after being compressed, is transferred from the communication I / F 19 to the client device 20 for display output.

  The RAM 14 further includes an image cache memory 14b, a component cache memory 14c, a URL image / component data amount counter (1) 14d, an application image / component data amount counter (1) 14e, and an application operation temporary memory 14f. Etc. are secured.

  When the screen data G for client display is generated by the image data drawing method (A), the image cache memory 14b stores components of the screen data G.

  In the component cache memory 14c, when the screen data G for client display is generated by the drawing method (B) using the components of the GUI toolkit, the components of the screen data G are stored.

  FIG. 8 is a diagram showing a specific example of count data in the URL image / part data amount counter (1) 14d of the server device 10.

  In the URL-specific image / part data amount counter (1) 14d, the screen of the Web page acquired by the Web browser activated in response to the current input event from the client device 20 is displayed as client screen data. The amount of data when G is generated by the image data drawing method (A) and the amount of data generated by the GUI toolkit component drawing method (B) are counted and associated with the URL of the page acquisition destination. And memorized.

  FIG. 9 is a diagram showing a specific example of count data in the application-specific image / part data amount counter (1) 14e of the server device 10.

  In the application-specific image / part data amount counter (1) 14e, the screen of an application other than the Web browser activated in response to the current input event from the client device 20 is used as screen data G for client display. The amount of data generated by the image data drawing method (A) and the amount of data generated by the GUI toolkit component drawing method (B) are counted and stored in association with the application name. The

  Various data input / output to / from the CPU 11 in accordance with execution of various application programs are temporarily stored in the application operation temporary memory 14f as necessary.

  Further, the URL-specific image / component data amount counter (2) 18a, the application-specific image / component data amount counter (2) 18b, and the like are secured in the external storage device 18.

  The URL-specific image / part data amount counter (2) 18a includes the URL-specific image / part data amount in the RAM 14 during the current connection with the client apparatus 20 when the connection with the client apparatus 20 is disconnected. The data amount in the case of image drawing (A) for each URL and the data amount in the case of component drawing (B), which are counted and stored by the counter (1) 14d, are read out, and the past totals in each case are read out. The amount of data is added and stored for each URL.

  The application-specific image / component data amount counter (2) 18b includes an application-specific image / component data amount in the RAM 14 during the current connection with the client device 20 when the connection with the client device 20 is disconnected. The data amount in the case of image drawing (A) for each application and the data amount in the case of component drawing (B), which are counted and stored by the counter (1) 14e, are read, and the past total in each case is read. The amount of data is added and stored for each application.

  Note that screen data to be displayed on the display device 16 of the server device 10 itself is generated on the frame buffer RAM 15.

  When the server apparatus 10 updates the screen data G of the Web page to be generated in the client frame buffer RAM 14a in response to an input event from the client apparatus 20, the URL-specific image / part data amount counter (2) 18a The past total data amounts of the image drawing (A) and the component drawing (B) corresponding to the corresponding URL stored in FIG. Then, the screen data G of the Web page is drawn and generated according to the drawing method ((A) or (B)) with the smaller total data amount, and transmitted to the client device 20.

  Further, when the server device 10 updates the screen data G corresponding to an application other than the Web page to be generated in the client frame buffer RAM 14a in response to an input event from the client device 20, the image / part by application The past total data amounts of the image drawing (A) and the component drawing (B) corresponding to the corresponding application name stored in the data amount counter (2) 18b are compared. Then, the screen data G of the application is drawn and generated according to the drawing method ((A) or (B)) with the smaller total data amount and transmitted to the client device 20.

  Accordingly, the data transfer amount for screen drawing generated by the server device 10 and transmitted to the client device 20 in response to an input event from the client device 20 is suppressed as much as possible.

  FIG. 10 is a block diagram showing a circuit configuration of the client device 20 in the SBC system.

  The client device 20 includes a CPU 21 as a computer, and a ROM 23, a RAM 24, and a frame buffer RAM 25 are connected to the CPU 21 via a bus 22. The screen data G written in the frame buffer RAM 25 is output to the display device 26 and displayed.

  Further, an input device 27 such as a keyboard and a mouse and an external storage device 28 are connected to the CPU 21 via the bus 22, and a communication I / F (interface) for communicating with the server device 10 via the network N. 29) is connected.

  The CPU 21 controls the operation of each part of the circuit using the RAM 24 as a working memory in accordance with a system program stored in the program memory 23a in the ROM 23 in advance. The CPU 21 controls a key input signal from the input device 27, a mouse movement signal, a communication I / O. The system program is activated and executed in response to an application response signal or transfer screen data G received from the server device 10 via F29.

  In the client device 20, various data generated by executing the application program in the server device 10 is appropriately read and stored in the external storage device 28. The display screen data G generated and transferred is The compressed data is decompressed, written in the frame buffer RAM 25, and displayed on the display device 26.

  At this time, the display screen data G generated and transferred by the client device 20 is received as image data when it is generated by the drawing method (A) using image data, and is displayed by the GUI toolkit component. If it is generated by the drawing method (B), it is received as GUI toolkit data, and is developed and written in the frame buffer RAM 25 according to the respective drawing method.

  A screen cache memory 24a is secured in the RAM 24, and the screen cache memory 24a stores the components of the screen data G to be written in the frame buffer RAM 25.

  Next, the operation of the SBC system configured as described above will be described.

(Server processing)
FIG. 11 is a flowchart showing server processing by the server device 10 of the SBC system.

  When a connection request is transmitted from the client device 20 to the server device 10, the server device 10 performs an authentication process on the client device 20 and establishes a connection with the client device 20.

  Then, when an input event signal corresponding to a user operation of the client device 20 is transmitted to the server device 10, the server device 10 executes an application program corresponding to the input event signal.

  Here, when it is determined that the screen data G for client display is updated by the execution of the application program according to the operation input (input event) from the client device 20 (step S1 (Yes)), the screen The process proceeds to a data amount counting process (see FIGS. 12 and 13) when the data G is generated by the image drawing method (A) (step SA).

  FIG. 12 is a flowchart showing an encoding data amount counting process of image drawing encoding accompanying the server process of the server apparatus 10.

  FIG. 13 is a flowchart showing an image encoding result data amount counting process accompanying the encoding data amount counting process of the image drawing encoding.

  First, when the process shifts to the encoding data amount counting process of image drawing encoding in FIG. 12 (step SA), the process shifts to the image encoding result data amount counting process in FIG. 13 (step AE). It is determined whether or not the data is cached in the image cache memory 14b (step E1).

  If it is determined that the data is cached in the image cache memory 14b (step E1 (Yes)), when the screen data G updated this time is generated using the cache data, the client device The amount of data transmitted to 20 (in this case, the amount of data of the cache ID) is counted (step E2).

  On the other hand, if it is determined in step E1 that the screen data G to be generated this time is not data cached in the image cache memory 14b (step E1 (No)), the screen data G to be generated this time is updated by the image drawing method (A). Screen data G to be generated is generated, and the amount of data transmitted to the client device 20 is counted (step E3).

  As described above, the amount of data to be generated and transmitted to the client device 20 by the image drawing method (A) depending on whether or not the screen data G for client display updated this time exists and does not exist in the image cache. Is counted (step AE), it is determined whether the application program that updates the screen data G for client display is a web browser or another application program (step A1).

  Here, when it is determined that the application program that updates the screen data G for client display is a Web browser, that is, when the screen data G is a Web page (step A1 (Yes)), the application program is updated. The data amount counted in step AE is associated with the URL of the Web page and added as the image data amount of the URL image / part data amount counter (1) 14d (step A2).

  On the other hand, when it is determined that the application program that updates the screen data G for client display is an application program other than the Web browser (step A1 (No)), the data amount counted in the step AE Are associated with the application program name and added as the image data amount of the application-specific image / component data amount counter (1) 14e (step A3).

  When the data amount counting process (step SA) when the client display screen data G is generated by the image drawing method (A) is completed in this way, the screen data G is then transferred to the GUI toolkit. The process shifts to a data amount count process (see FIGS. 14 and 15) when generated by the component drawing method (B) (step SB).

  FIG. 14 is a flowchart showing an encoding data amount counting process of component drawing encoding accompanying the server process of the server device 10.

  FIG. 15 is a flowchart showing a component encoding result data amount counting process accompanying the encoding data amount counting process of the component drawing encoding.

  When the process shifts to the encoding data amount counting process for component drawing encoding in FIG. 14 (step SB), the process first shifts to the component encoding result data amount counting process in FIG. 15 (step BF). It is judged whether or not the component is data cached in the component cache memory 14c (step F1).

  Here, if it is determined that the data is cached in the component cache memory 14c (step F1 (Yes)), when the screen data G updated this time is generated using the cache data, the client device 20 Is counted (in this case, the data amount of the cache ID) (step F2).

  On the other hand, if it is determined in step F1 that the screen data G to be generated this time is not data cached in the component cache memory 14c (step F1 (No)), a drawing method (B The screen data G updated this time is generated, and the amount of data transmitted to the client device 20 is counted (step F3).

  In this manner, the client display screen data G updated this time is generated by the drawing method (B) using the GUI toolkit component and transmitted to the client device 20 depending on whether or not the component cache exists. When the data amount for counting is counted (step BF), it is determined whether the application program that updates the screen data G for client display is a Web browser or another application program (step BF). B1).

  If it is determined that the application program for updating the client display screen data G is a Web browser, that is, if the screen data G is a Web page (step B1 (Yes)), the step The data amount counted by the BF is associated with the URL of the Web page and added as the component data amount of the URL image / component data amount counter (1) 14d (step B2).

  On the other hand, when it is determined that the application program for updating the screen data G for client display is an application program other than the Web browser (step B1 (No)), the data amount counted in the step BF Is associated with the application program name and added as the component data amount of the application-specific image / component data amount counter (1) 14e (step B3).

  Thus, the screen data G for client display this time is generated by the data amount counting process (step SA) when generated by the image drawing method (A) and the drawing method (B) by the GUI toolkit component. When the data amount counting process (step SB) is completed, it is determined whether the application program for updating the screen data G for client display is a Web browser or another application program ( Step S2).

  If it is determined that the application program that updates the screen data G for client display is an application program other than the Web browser (step S2 (No)), the process proceeds to the application drawing method determination process in FIG. Transition is made (step SC).

  FIG. 16 is a flowchart showing application drawing method determination processing accompanying server processing of the server device 10.

  In this application drawing method determination process, first, image data associated with generation of past screen data G for each application program name stored in the image / part data amount counter (2) 18b for each application in the external storage device 18 is stored. From the total amount and the total component data amount, the total image data amount and the total component data amount corresponding to the name of the application program being executed this time are read (steps C1 and C2).

  Then, the total amount of image data associated with the generation of past screen data G read out corresponding to the application program being executed this time (the past screen data G is displayed by the image drawing method (A) when the same application is executed). The total amount of data when generated) is compared with the total amount of component data (total amount of data when past screen data G is generated by the GUI toolkit component drawing method (B) when the same application is executed) Then, it is determined whether or not the total amount of component data is smaller (step C3).

  If it is determined that the total amount of parts data is smaller (step C3 (Yes)), the current screen data G is generated by the drawing method (B) using the parts of the GUI toolkit, and the client It is determined that it should be transmitted to the device 20 (step C4).

  On the other hand, when it is determined that the total amount of component data is not smaller, that is, the total amount of image data is smaller (step C3 (No)), the current screen data G is displayed as an image drawing method ( It is determined that the data should be generated and transmitted according to B) (step C5).

  When it is determined in the application drawing method determination process (step SC) that the screen data G updated this time should be generated by the drawing method (B) using the components of the GUI toolkit and transmitted to the client device 20 (Step S3 (Yes)), the screen data G updated this time is generated by the drawing method (B) using the GUI tool kit component, and is transmitted to the client device 20 (Step S4).

  On the other hand, in the application drawing method determination process (step SC), when it is determined that the screen data G updated this time should be generated by the image drawing method (A) and transmitted to the client device 20 (step). S3 (No)), the screen data G updated this time is generated by the drawing method (A) based on the image, and is transmitted to the client device 20 (step S5).

  On the other hand, if it is determined in step S2 that the application program for updating the screen data G for client display is a Web browser (step S2 (Yes)), the process proceeds to the URL drawing method determination process in FIG. (Step SD).

  FIG. 17 is a flowchart showing URL drawing method determination processing accompanying server processing of the server device 10.

  In this URL drawing method determination process, first, accompanying the generation of past screen data (Web page) G for each URL stored in the URL-specific image / part data amount counter (2) 18a in the external storage device 18. From the total image data amount and the total component data amount, the total image data amount and the total component data amount corresponding to the URL accessed by the Web browser this time are read (steps D1 and D2).

  Then, the total amount of image data associated with the generation of past screen data G read corresponding to the URL being accessed this time (a method of rendering past screen data [Web page] G with an image when accessing the same URL) ( The total amount of data generated in (A)) and the total amount of component data (when past screen data [Web page] G is generated by the GUI toolkit component drawing method (B) when accessing the same URL) The total data amount) is compared, and it is determined whether or not the total of the component data amounts is smaller (step D3).

  If it is determined that the total amount of parts data is smaller (step D3 (Yes)), the current screen data G is generated by the drawing method (B) using the parts of the GUI toolkit, and the client It is determined that it should be transmitted to the device 20 (step D4).

  On the other hand, when it is determined that the total amount of component data is not smaller, that is, the total amount of image data is smaller (step D3 (No)), the current screen data G is displayed as an image drawing method ( It is determined that the data should be generated and transmitted according to B) (step D5).

  In the URL drawing method determination process (step SD), the screen data (Web page) G updated this time should be generated by the drawing method (B) using the GUI toolkit component and transmitted to the client device 20. If it is determined (step S6 (Yes)), the screen data (Web page) G updated this time is generated by the drawing method (B) using the GUI toolkit component, and transmitted to the client device 20 ( Step S4).

  On the other hand, in the URL drawing method determination process (step SD), the screen data (Web page) G updated this time is determined to be generated by the image drawing method (A) and transmitted to the client device 20. (Step S6 (No)), the screen data (Web page) G updated this time is generated by the drawing method (A) based on the image and transmitted to the client device 20 (Step S7).

  Thereafter, in response to a disconnection request from the client device 20, if the connection with the client device 21 is disconnected (step S8 (Yes)), the URL-specific image / part data amount counter (1) 14d in the RAM 14 The amount of data by image drawing (A) and the amount of data by component drawing (B) of the screen data G for each URL counted during connection with the current server device 10 stored in the memory are read out and stored in the external storage. It is added to the total of the past corresponding image data amounts and the total of the component data amounts stored in the image / part data amount counter (2) 18a for each URL in the apparatus 18. At the same time, the image rendering of the screen data G for each application other than the Web browser counted during the connection with the current server device 10 stored in the image / part data amount counter (1) 14e for each application in the RAM 14 is performed. The past data corresponding to each past image stored in the application-specific image / component data amount counter (2) 18b in the external storage device 18 are read out by the data amount by (A) and the data amount by component drawing (B). It is added to the total data amount and the total component data amount (step S9).

(Client processing)
FIG. 18 is a flowchart showing server screen display processing by the client device 10 of the SBC system.

  When the input event signal corresponding to the user operation of the client device 20 is transmitted to the server device 10 and the screen data G generated in the server device 10 is received (step T1 (Yes)), the input event signal is received. It is determined whether the screen data G has been received as a cache ID stored in the screen cache memory 24a (step T2).

  Here, the screen data G received from the server device 10 is not the cache ID stored in the screen cache memory 24a, but is the image data drawn screen data G, or the screen data drawn by the GUI toolkit. If it is G (step T2 (No)), the received data is stored in the screen cache memory 24a (step T3).

  The received screen data G is developed and written in the frame buffer RAM 25 in accordance with a drawing method [image drawing (A) or component drawing (B)] of the screen data G, and is displayed on the display device 26 ( Step T4).

  On the other hand, if it is determined in step T2 that the screen data G received from the server device 10 is the cache ID stored in the screen cache memory 24a, the data associated with the cache ID is read. Is written into the frame buffer RAM 25 and displayed on the display device 26 (step T5).

  In this way, the screen data G generated in the server device 10 in accordance with the input event signal according to the user operation from the client device 20 is the image drawn data, the data drawn by the GUI toolkit, or the cache ID. Is expanded in the frame buffer RAM 25 and displayed on the display device 26.

  Therefore, according to the screen drawing transmission function by the server device 10 of the SBC system having the above-described configuration, the screen data G for client display is generated according to the application program executed in response to the input event signal from the client device 20, and the client Each time data is transmitted to the apparatus 10, the amount of transmission data (image data amount) when the screen data G is image-drawn (A) and the amount of transmission data (component data amount) when the component is drawn (B) by the GUI toolkit And the sum of each data amount is added and stored for each type of application program to be executed (for each Web browser, for each URL, for other applications, for each application name). The drawing data G for client display is the smaller of the past total data amount by image drawing (A) and the past total data amount by component drawing (B) stored for each type of application program. The drawing is generated by the drawing method [(A) or (B)] and transmitted to the client device 20.

  For this reason, it becomes possible to reduce the total transmission data amount to the client apparatus 20 of the screen data G drawn and generated by the server apparatus 10 in response to an operation input from the client apparatus 20 as much as possible. Response can be improved.

  It should be noted that each processing technique by the server device 10 of the SBC system described in the above embodiment, that is, the server processing shown in the flowchart of FIG. 11 and the encoded data amount of the image drawing encoding accompanying the server processing shown in FIGS. Count processing, encoding data amount counting processing of component drawing encoding accompanying the server processing shown in FIGS. 14 and 15, application drawing method determination processing accompanying the server processing shown in FIG. 16, URL accompanying the server processing shown in FIG. Each method such as drawing method determination processing is a program that can be executed by a computer, such as a memory card (ROM card, RAM card, etc.), a magnetic disk (floppy disk, hard disk, etc.), an optical disc (CD-ROM, DVD, etc.). Etc.), semiconductor memory, etc. It may be distributed and stored in the medium of the external storage device 18. Then, the computer (CPU 11) of the server device 10 reads the program stored in the medium of the external storage device 18 into the storage device (flash ROM 13 or RAM 14), and the operation is controlled by the read program, thereby The switching function of the screen drawing method in the server apparatus 10 described in the embodiment can be realized, and the same processing by the method described above can be executed.

  Further, program data for realizing each of the above methods can be transmitted on the communication network (N) in the form of a program code, and from a computer device (program server) connected to the communication network (N). The program data can be fetched and stored in a storage device (flash ROM 13 or RAM 14), and the above-described screen drawing method switching function in the server device 10 can be realized.

  Note that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention at the stage of implementation. Further, each of the embodiments includes inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in each embodiment or some constituent elements are combined in different forms, the problems described in the column of the problem to be solved by the invention If the effects described in the column “Effects of the Invention” can be obtained, a configuration in which these constituent requirements are deleted or combined can be extracted as an invention.

DESCRIPTION OF SYMBOLS 10 ... Server apparatus 20 ... Client apparatus 11, 21 ... CPU
12, 22 ... Bus 13, 23 ... ROM
13a, 23a ... Program memory 14, 24 ... RAM
14a: Client frame buffer RAM
14b: Image cache memory 14c: Component cache memory 14d: URL-specific image / component data amount counter (1)
14e ... Application-specific image / part data amount counter (1)
14f ... Temporary memory for application operation 24a ... Screen cache memory 15, 25 ... Frame buffer RAM
16, 26 ... display device 17, 27 ... input device 18, 28 ... external storage device 18a ... URL-specific image / part data amount counter (2)
18b ... Application-specific image / part data amount counter (2)
19, 29 ... Communication I / F
N: Communication network Pa, Pb: Web page screen data Qa, Qb: Application screen data

Claims (4)

A server device of a server-based computing system that executes an application program according to an input event from a client device connected via a network, generates screen information according to the input event, and transmits the screen information to the client device Because
A data amount counting means for counting a data amount when the screen information corresponding to the input event is generated by drawing image data and a data amount when generating by drawing a component by the GUI toolkit;
The data amount when the screen information counted by the data amount counting means is image-drawn and the data amount when the component is drawn are added and stored for each type of application program each time the screen information is updated. Image / part total data amount storage means;
When generating screen information corresponding to the input event, in the case of image drawing stored by the image / part total data amount storage means corresponding to the type of application program executed in response to the input event A drawing method determination means for determining a drawing method which is smaller of the total data amount and the total data amount in the case of component drawing;
Screen information transmitting means for generating screen information corresponding to the input event and transmitting the screen information to the client device according to the drawing method determined by the drawing method determining means;
A server device comprising: The application program type includes a web browser,
When the application program executed in response to the input event is a web browser,
The amount of data when the image information is drawn and the amount of data when the component is drawn are the same as that of the Web browser. Stored for each URL of the access destination,
The drawing method determining means stores the image / component total data amount storage means corresponding to the URL of the access destination of the Web browser executed in response to the input event when generating screen information corresponding to the input event. Determining the drawing method of the smaller one of the total data amount in the case of image drawing and the total data amount in the case of component drawing stored by
The server apparatus according to claim 1. A server device and a client device connected via a network, and screen information generated according to an application program executed by the server device in response to an input event from the client device is transmitted to the client device and displayed. A server-based computing system that is displayed on the screen,
The server device
A data amount counting means for counting a data amount when the screen information corresponding to the input event is generated by drawing image data and a data amount when generating by drawing a component by the GUI toolkit;
The data amount when the screen information counted by the data amount counting means is image-drawn and the data amount when the component is drawn are added and stored for each type of application program each time the screen information is updated. Image / part total data amount storage means;
When generating screen information corresponding to the input event, in the case of image drawing stored by the image / part total data amount storage means corresponding to the type of application program executed in response to the input event A drawing method determination means for determining a drawing method which is smaller of the total data amount and the total data amount in the case of component drawing;
Screen information transmitting means for generating screen information corresponding to the input event and transmitting it to the client device according to the drawing method determined by the drawing method determining means;
The client device is
Screen display control means for receiving the screen information transmitted by the screen information transmission means of the server device and displaying it on the display unit;
A server-based computing system. A server device of a server-based computing system that executes an application program according to an input event from a client device connected via a network, generates screen information according to the input event, and transmits the screen information to the client device A program for controlling a computer of
The computer,
A data amount counting means for counting a data amount when the screen information corresponding to the input event is generated by drawing image data and a data amount when generating by drawing the component by the GUI toolkit;
Each time the screen information is updated, the data amount when the screen information counted by the data amount counting means is image-drawn and the data amount when the component is drawn are added to the memory for each type of application program. Storing image / part total data amount storage means;
When generating screen information corresponding to the input event, in the case of image drawing stored by the image / part total data amount storage means corresponding to the type of application program executed in response to the input event A drawing method determination means for determining a drawing method which is smaller of the total data amount and the total data amount in the case of component drawing;
Screen information transmission means for generating screen information corresponding to the input event and transmitting the screen information to the client device according to the drawing method determined by the drawing method determination means;
Server control program that can function as

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