CN105069058A - Quick response method of network map request for high-frequency interaction environment - Google Patents

Abstract

The invention discloses a method for quickly responding to a network map request in a high-frequency interactive environment. The method comprises the following steps: initializing a map display window of a browser; obtaining the maximum number c of network connections of the browser; creating and starting c network maps Request queue processing thread; calculate the number t of map images that need to be rendered in the network map window; add the network map request to the end of the network map request queue; select an unloaded network map request from the network map request queue; send the network map Image request; set the network map image status to loaded and display the map image. The invention can control the number of concurrent network map requests according to the limit of the number of network connections by the browser, and can automatically eliminate invalid network map requests, and is suitable for fast browsing of network maps in high-frequency interactive environments, especially in low-bandwidth network environments Under this circumstance, it can realize the rapid response to the network map request in the high-frequency interactive environment.

Description

A Fast Response Method for Web Map Requests in High Frequency Interactive Environments

technical field

The invention relates to a high-performance space computing technology, in particular to a method for quickly responding to a network map request in a high-frequency interactive environment.

Background technique

The rapid response to web map requests in high-frequency interactive environments is one of the problems to be solved in WebGIS, especially in low-bandwidth network environments, the response speed of web map requests directly affects the user experience of map browsing operations in browsers. At present, mainstream browsers have restrictions on the number of concurrent requests for map images under the same domain name. In order to increase the number of concurrent requests for map images and reduce the response time of network map requests, map service providers such as Google, Baidu, and Tiandi map all use 8 domain names. To increase the number of concurrent browser requests, but in a high-frequency interactive environment, a large number of network map image requests still cannot get a fast response, especially in a low-bandwidth network environment, the page response time will be longer, and it is difficult to meet the user's needs. demand, a large number of invalid network map requests are sent to the server, wasting precious bandwidth resources; on the other hand, adding domain names will not only increase the complexity of network map client implementation, but also high cost, difficult maintenance, access to multiple domain names It will also increase the time overhead of domain name resolution.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for quickly responding to network map requests in a high-frequency interactive environment in view of the defects in the prior art.

The technical solution adopted by the present invention to solve the technical problem is: a method for quickly responding to a network map request in a high-frequency interactive environment, comprising the following steps:

Step 1) initialize the browser map display window, set the pixel height and pixel width of the network map window;

Step 2) Obtain the maximum number of network connections c of the browser;

Step 3) Create and start c network map request queue processing threads;

Step 4) calculate the map image number t that needs to be rendered in the network map window according to the pixel height and the pixel width of the network map window;

Step 5) create a network map request queue;

Step 6) create a network map image control in a loop, and use a blank image for rendering;

Step 7) the status attribute of network map image is set as unloaded state;

Step 8) judge whether the length of the network map request queue is less than t, if yes, then add the network map request to the end of the network map request queue; if not, delete the first item in the network map request queue, and then add the network map request Add to the end of the network map request queue;

Step 9) network map request queue processing thread loop calculation network map request number u in the loading state in the network map request queue, judge whether u is less than c, if yes, then enter step 10); if not, then repeat step 9) re compute u;

Step 10) select an unloaded web map request from the web map request queue;

Step 11) The state of the selected network map request is set to be the loading state;

Step 12) send network map image request;

Step 13) After the request is completed, set the status of the network map image as loaded, and display the map image.

According to the above scheme, the number t of map images to be rendered in the network map window, t=(w/pw+1)(h/ph+1);

Among them, h is the pixel height of the web map window, w is the pixel width of the web map window, ph is the pixel height of a single map image, and pw is the pixel width of a single map image.

According to the above solution, the network map request whose status is not loaded in the step 10) is selected sequentially.

The beneficial effects produced by the present invention are: the method of the present invention can control the number of network map requests, automatically eliminate invalid network map requests, realize rapid response to network map requests in a high-frequency interactive environment, save precious bandwidth resources, and support high Concurrent network map service performance improvement provides technical support, especially helping to improve the rapid response capability of network map services in low-bandwidth network environments.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is the method flowchart of the embodiment of the present invention;

Fig. 2 is a flow chart of the method of the present invention taking the fast response to the network map request in the Chrome browser as an example.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figure 1, a method for quickly responding to a network map request in a high-frequency interactive environment includes the following steps:

Step 1) initialize the browser map display window, set the pixel height h and pixel width w of the network map visualization window;

Step 2) Obtain the maximum number of network connections c of the browser;

Step 3) call the setInterval function in javascript to create and start c network map request queue processing threads;

Step 4) Calculate the number of map images (t) that need to be rendered in the map window according to w, h and the pixel height ph and pixel width pw of a single map image, where t=(w/pw+1)(h/ph+ 1);

Step 5) Utilize the Array class to create an array object to create a network map request queue;

Step 6) Create a network map image control in a loop, and use a blank image to render it;

Step 7) The status attribute of the network map image is set as an unloaded (unload) state;

Step 8) judge whether the length of network map request queue is less than t, if yes, then network map request is added in the network map request queue; if not, then enter step 9);

Step 9) delete the first item in the network map request queue, and then add the network map request to the end in the network map request queue;

Step 10) the network map request queue processing thread loop calculation network map request queue is in the network map request number (u) of the loading state (that is, the status attribute is loading), judge whether u is less than c, if so, then enter step 11); If not, repeat step 10) to recalculate u;

Step 11) select a status attribute as a network map request of unload from the network map request queue;

Step 12) The status attribute of the selected network map request is set to be loading (loading) status;

Step 13) send network map image request;

Step 14) When the request is completed, the status attribute of the network map image is set to be loaded (loaded), and the map image is displayed. When the status attributes of all network map images are loaded, the network map request processing ends.

The most obvious advantage of the present invention is that through steps 8 to 11, the number of network map requests in a high-frequency interactive environment can be controlled, invalid network map requests can be automatically eliminated during high-frequency interaction, and network map requests in a high-frequency interactive environment can be realized. Fast response, and helps to save precious bandwidth resources in low-bandwidth network environment.

Embodiment one:

In order to illustrate the idea of the present invention more clearly, below in conjunction with accompanying drawing 2, take the quick response of network map request in Chrome browser as embodiment to carry out further description, in this embodiment, network map display window width is set to 1280 pixels, The height is set to 1024 pixels, and the width and height of a single web map image are both 256 pixels. The operation of quickly zooming in on the map from level 3 to level 16 in the browser is used as the implementation of the high-frequency interaction scene of the web map example. The specific steps of the quick response method for the network map request are as follows:

Step 200), initialize the Chrome browser map display window, set the width of the network map visualization window to 1280 pixels, and the height is 1024 pixels;

Step 201), obtain the browser type, which is a Chrome browser, and its maximum network connection number is 6, so the maximum network map request number is set to 6;

Step 202), circularly calling the setInterval function in javascript 6 times, creating and starting 6 network map request queue processing threads;

Step 203), according to the height and width of the map visualization window set in step 200 and the height and width of a single map image, calculate the number of map images t that need to be rendered in the map window under each map display level, t=(1280/256+1 )·(1024/256+1)=30;

Step 204), utilizing the Array class to create an array object to create a network map request queue;

Step 205), the user interacts with the map in the browser through the mouse or keyboard, and whenever the map display range changes, a new network map image control to be displayed is created in a loop, and an img object in the html is generated, in order to prevent it from immediately Send a network request, first rendering it with a blank image;

Step 206), setting the status attribute of each network map image is not loading (unload) state;

Step 207), judge whether the length of network map request queue is less than 30, if yes, then network map request is added in the network map request queue; If not, then enter step 208);

Step 208), delete the first item in the network map request queue, and then add the network map request to the end of the network map request queue;

Step 209), 6 network map request queue processing threads respectively recursively calculate the network map request number (u) in the loading state (that is, the status attribute is loading) in the network map request queue, and judge whether u is less than 6, and if so, enter Step 210); if not, repeat step 209) to recalculate u;

Step 210), selecting a status attribute from the network map request queue is a network map request of unload;

Step 211), the status attribute of the network map request of setting selection is loading (loading) status;

Step 212), sending a network map image request;

Step 213), the request is completed, the status attribute of the network map image is set to loaded (loaded), and the map image is displayed. When the status attribute of all network map images is loaded, the network map request processing ends.

In the environment of high-frequency user interaction, this embodiment will first control the number of network map request queues in steps 207 and 208. When operating maps at high frequency, old invalid network map requests will be automatically eliminated to ensure that the network map The number of requests in the request queue is consistent with the number of network map images that need to be displayed currently. On the other hand, this embodiment will control the concurrent number of network map requests in steps 209 and 210, and control it within the maximum number of network connections of the browser, so as to avoid sending too many invalid network requests to the server. Map image requests, thus saving valuable bandwidth resources in high-frequency interactive environments. In the high-frequency interactive application scenario of this embodiment, if the traditional network map request method is used, a total of (16-3+1)*30=420 network map image requests will be sent, but with the method of the present invention, only 30 network map image requests, so as to realize the rapid response of the network map request in the high-frequency interactive environment, especially in the low-bandwidth network environment, the method provided by the present invention is of great significance for saving precious bandwidth resources.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the protection scope of the appended claims of the present invention.

Claims (3)

1. The method for quickly responding to a network map request in a high-frequency interactive environment, comprising the following steps: 1) Initialize the browser map display window, and set the pixel height and pixel width of the network map window; 2) Obtain the maximum number of network connections c of the browser; 3) Create and start c network map request queue processing threads; 4) Calculate the number t of map images to be rendered in the network map window according to the pixel height and pixel width of the network map window; 5) Create a network map request queue; 6) Create a network map image control in a loop, and use a blank image for rendering; 7) The status attribute of the network map image is set as an unloaded state; 8) Determine whether the length of the network map request queue is less than t, if yes, add the network map request to the end of the network map request queue; if not, delete the first item in the network map request queue, and then add the network map request to the end of the network map request queue; 9) The network map request queue processing thread loops to calculate the network map request number u in the loading state in the network map request queue, and judge whether u is less than c, if yes, then enter step 10); if not, then repeat step 9) to recalculate u; 10) Select a network map request whose status is not loaded from the network map request queue; 11) The state of the selected network map request is set to be the loading state; 12) Send a network map image request; 13) After the request is completed, set the status of the network map image as loaded, and display the map image. 2. quick response method according to claim 1, is characterized in that, in described step 4) in the map image number t that needs rendering in network map window, t=(w/pw+1)·(h/ph +1); Among them, h is the pixel height of the web map window, w is the pixel width of the web map window, ph is the pixel height of a single map image, and pw is the pixel width of a single map image. 3. The quick response method according to claim 1, characterized in that, in the step 10), the network map request whose status is not loaded is selected as sequential selection.