CN112434124A - Control method, device, processor and storage medium for avoiding memory leakage in radio Web map track drawing - Google Patents
Control method, device, processor and storage medium for avoiding memory leakage in radio Web map track drawing Download PDFInfo
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Abstract
The invention relates to a control method for avoiding memory leakage in the process of drawing a radio Web map track, which comprises the steps of initializing, receiving data to draw, drawing a linear track every 5 seconds, and judging whether the interval between the current time and the last recording time is more than 5 seconds; otherwise, continuing to draw the linear track; starting to record the frame number, and recording as itemCount; judging whether the frame number itemCount is smaller than the total frame number totalitem, if so, creating a layer Feature, adding current longitude and latitude data into the Feature, and adding the Feature into the layer; otherwise, removing the first dot-shaped layer feature in the feature set Features to obtain a new frame number itemCount. The invention also relates to a corresponding device, a processor and a computer readable storage medium thereof. By adopting the control method, the control device, the control processor and the computer-readable storage medium for avoiding memory leakage in the process of drawing the radio Web map track, tasks related to the map track can be executed for at least 10 hours while the browser page is kept in an activated state, about 60MB of the browser is kept, and the browser is not crashed. The method can keep the monitoring task from dragging the map page to be not blocked in a long-time running state.
Description
Technical Field
The invention relates to the field of radio detection systems, in particular to the field of radio Web maps, and specifically relates to a control method, a control device, a control processor and a computer-readable storage medium for avoiding memory leakage in the process of drawing a radio Web map track.
Background
In a radio detection system with a B/S (browser/Server) architecture, a JavaScript language developed and applied by a web end has a set of recovery mechanisms, and local variables and objects can be recovered by the system after being used up in most cases. The closure is a characteristic of JavaScript, and many advanced applications of a web front-end framework are implemented by virtue of the closure, but when a program uses a cyclic reference or a closure is used, and the program runs for a long time and mass data is continuously processed, memory leakage of the web end is easily generated. Once the web end generates memory leak, sometimes the radio monitoring system needs to perform tasks for ten and several hours, and the tasks are not performed to half, which may result in slow execution of the whole program and even a page crash of the whole web end due to too much pressure on processing mass data at the web end. Moreover, to reproduce the problem, long-time stress testing and manual code checking are usually required, which reduces the efficiency of software development. Therefore, the invention aims to provide a solution for efficiently solving the problem of memory leakage of the radio monitoring system during long-time running of the web-side mapping.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a control method, a control device, a control processor and a computer-readable storage medium thereof, which have the advantages of high efficiency, simple and convenient operation and wide application range and can avoid memory leakage in the process of drawing the radio Web map track.
In order to achieve the above object, the control method, apparatus, processor and computer readable storage medium for avoiding memory leak in radio Web mapping according to the present invention are as follows:
the control method for avoiding memory leakage in the process of drawing the radio Web map track is mainly characterized by comprising the step of drawing a map linear track, and specifically comprises the following steps:
(1) initializing, receiving data drawing, drawing a linear track every 5 seconds, judging whether the interval between the current time and the last recording time is more than 5 seconds, and if so, continuing the step (2); otherwise, continuing the step (1);
(2) starting to record the frame number, and recording as itemCount;
(3) judging whether the frame number itemCount is smaller than the total frame number totalitem, if so, continuing the step (5); otherwise, continuing the step (4);
(4) removing the first dot-shaped layer feature in the feature set Features to obtain a new frame number itemCount;
(5) and if the itemCount% limitPartOfitem is equal to 0, newly establishing a layer Feature, adding current longitude and latitude data into the Feature, and adding the Feature into the layer.
Preferably, the obtaining of the new frame number itemCount in the step (1) includes:
the new frame number itemCount is obtained according to the following formula:
itemCount＝itemCount－limitPartOfitem×2；
wherein itemCount is the count of the current frame, and limiPartOfItem is the count of the additive line type layer Feature.
Preferably, the initialization in step (1) is specifically:
initializing a page, initializing resources and objects of a map linear layer, and adding the initialized linear layer to the map.
Preferably, the method further comprises a step of drawing a map punctual trajectory, specifically comprising the steps of:
(1-1) initializing, receiving data drawing, drawing a dot track every 5 seconds, judging whether the interval between the current time and the last recording time is more than 5 seconds, and if so, continuing the step (1-2); otherwise, continuing the step (1-1);
(1-2) acquiring a punctiform layer feature set;
(1-3) judging whether the length of the point layer feature set is greater than or equal to an upper limit, and if so, removing a first layer feature in the set; otherwise, continuing the step (1-1).
Preferably, the initialization in step (1-1) is specifically:
initializing a page, initializing resources and objects of a map point-like track layer, and adding the initialized point-like track layer to the map.
The control device for avoiding memory leakage in the process of drawing the radio Web map track is mainly characterized by comprising the following steps:
a processor configured to execute computer-executable instructions;
and a memory storing one or more computer-executable instructions that, when executed by the processor, perform the steps of implementing the control method for radio Web mapping to avoid memory leakage.
The processor for avoiding the memory leakage in the radio Web map track drawing is mainly characterized in that the processor is configured to execute computer executable instructions, and when the computer executable instructions are executed by the processor, the steps of the control method for avoiding the memory leakage in the radio Web map track drawing are realized.
The computer-readable storage medium is mainly characterized by having a computer program stored thereon, wherein the computer program can be executed by a processor to implement the steps of the control method for avoiding memory leak in radio Web mapping.
By adopting the control method, the control device, the control processor and the computer-readable storage medium for avoiding memory leakage in the process of drawing the radio Web map track, tasks related to the map track can be executed for at least 10 hours while the browser page is kept in an activated state, about 60MB of the browser is kept, and the browser is not crashed. The method can keep the monitoring task from dragging the map page to be not blocked in a long-time running state.
Drawings
Fig. 1 is a schematic diagram of a long-time running map-drawing linear track at a Web end for implementing the control method for avoiding memory leakage in radio Web map-drawing according to the present invention.
Fig. 2 is a schematic diagram of a map point-like locus drawn by a Web end running for a long time, which is used for implementing the control method for avoiding memory leakage in the radio Web map locus drawing of the present invention.
Fig. 3 is a diagram illustrating a memory usage of 97MB in the prior art.
Fig. 4 is a schematic diagram illustrating a memory usage trend in the prior art.
Fig. 5 is a schematic diagram of memory usage of 60MB for implementing the control method for avoiding memory leak in radio Web mapping according to the present invention.
Fig. 6 is a schematic diagram showing a steady state existing in the internal memory of the control method for avoiding memory leak in the radio Web mapping according to the present invention.
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.
The control method for avoiding memory leakage in the radio Web map track drawing comprises the following steps:
(1) initializing, receiving data drawing, drawing a linear track every 5 seconds, judging whether the interval between the current time and the last recording time is more than 5 seconds, and if so, continuing the step (2); otherwise, continuing the step (1);
(2) starting to record the frame number, and recording as itemCount;
(3) judging whether the frame number itemCount is smaller than the total frame number totalitem, if so, continuing the step (5); otherwise, continuing the step (4);
(4) removing the first dot-shaped layer feature in the feature set Features to obtain a new frame number itemCount;
(5) and if the itemCount% limitPartOfitem is equal to 0, newly establishing a layer Feature, adding current longitude and latitude data into the Feature, and adding the Feature into the layer.
As a preferred embodiment of the present invention, the step (1) obtains a new frame number itemCount, specifically:
the new frame number itemCount is obtained according to the following formula:
itemCount＝itemCount－limitPartOfitem×2；
wherein itemCount is the count of the current frame, and limiPartOfItem is the count of the additive line type layer Feature.
As a preferred embodiment of the present invention, the initialization in step (1) specifically includes:
initializing a page, initializing resources and objects of a map linear layer, and adding the initialized linear layer to the map.
As a preferred embodiment of the present invention, the method further includes a step of drawing a map dotted locus, specifically including the following steps:
(1-1) initializing, receiving data drawing, drawing a dot track every 5 seconds, judging whether the interval between the current time and the last recording time is more than 5 seconds, and if so, continuing the step (1-2); otherwise, continuing the step (1-1);
(1-2) acquiring a punctiform layer feature set;
(1-3) judging whether the length of the point layer feature set is greater than or equal to an upper limit, and if so, removing a first layer feature in the set; otherwise, continuing the step (1-1).
As a preferred embodiment of the present invention, the initialization in step (1-1) specifically comprises:
initializing a page, initializing resources and objects of a map point-like track layer, and adding the initialized point-like track layer to the map.
As a preferred embodiment of the present invention, the control device for avoiding memory leak in radio Web mapping is implemented, including:
a processor configured to execute computer-executable instructions;
and a memory storing one or more computer-executable instructions that, when executed by the processor, perform the steps of implementing the control method for radio Web mapping to avoid memory leakage.
As a preferred embodiment of the present invention, the processor for avoiding memory leak for radio Web mapping is configured to execute computer-executable instructions, and when the computer-executable instructions are executed by the processor, the steps of the control method for avoiding memory leak for radio Web mapping are realized.
The computer readable storage medium has stored thereon a computer program which is executable by a processor to implement the above-mentioned steps of implementing the control method for radio Web mapping avoiding memory leaks.
In the specific implementation mode of the invention, the development language of the Web end is JavaScript, compared with the language Java of the server end, the Java belongs to multiple threads, namely, multiple threads can be executed simultaneously, the JavaScript can only execute 1 thread, and the next thread can be executed only after the current thread is executed. In a language of a server side like JAVA, the memory consumption problem of the server side can be solved by utilizing the characteristics of multithreading or based on multithreading. However, the JavaScript on the web side cannot solve the problem of memory consumption by using multiple threads, and the JavaScript on the web side needs time to release the memory, and if a large amount of data is processed for a long time, the web side does not have time to release the memory. The method solves the difficulty of memory leakage in Web map track drawing.
Firstly, a way of drawing a map linear track is operated by a web end for a long time:
when a map linear track is drawn, only one linear map layer Feature is added to a currently newly-built map layer by most linear track drawing mechanisms, and as longitude and latitude data increase, a web end adds a group of longitude and latitude data to the initially-built linear map layer Feature every time the web end receives a frame of longitude and latitude data.
Therefore, when drawing a line type track on a map, in order to reduce the memory overhead, we take the following operations (for easier understanding, several variables are predefined: limitPartOfItem: decide to add the count of the line type layer Feature, totalItem: the total frame number of drawing, itemCount: the count of the current frame):
1. in the mounting stage of the page, which is a page initialization stage, resources and objects of a linear map layer of the map are initialized, and the initialized linear map layer is added to the map.
2. In the data receiving and drawing stage, the linear track is drawn every 5 seconds.
3. Releasing the variable of the stored linear layer Feature before every other limit PartOfItem frame longitude and latitude data, then newly building a new layer Feature to be added to the linear layer, if the map exceeds the totalItem frame, beginning to remove the first Feature in the linear layer Feature set Features, and then keeping the capacity of the whole Feature set Features in the longitude and latitude data of the totalItem frame by itemCount-2 limit PartOfItem.
Secondly, the web end runs a map point-like track drawing mode for a long time:
when a map dotted track is drawn, the drawing principle is that a dotted layer Feature is newly built every time a web end receives a frame of data, and each dotted layer Feature independently stores a group of longitude and latitude data. However, because the web-side received frames generally have 20 frames of latitude and longitude data per second, as time increases, the length of the punctiform map-layer feature set featureis longer and longer, the memory usage is larger and larger, and in addition, the web-side continuously receives data and then draws the data, the process of the third-party plug-in which is used for accessing map data in the browser is continuously created and called without a time release process, so that memory leakage is caused.
Therefore, when drawing a dotted track on a map, in order to reduce the memory overhead, we take the following operations:
1. in the mounting stage of the page, which is a page initialization stage, resources and objects of a map dotted track layer are initialized, and the initialized dotted track layer is added to the map.
2. In the stage of drawing the received data, the point-like track is drawn every 5 seconds.
3. And acquiring a punctiform image-layer feature set Features, and if the length of the set is greater than a specified upper limit value, beginning to remove the first punctiform image-layer feature in the set.
As shown in fig. 3, when the problem of memory leak during mapping track drawing is not solved during task operation, the memory usage of the web browser that is drawing the mapping track is increasing, and the memory usage increases to 97MB at present over time.
As shown in fig. 4, in the case of not solving the memory leak problem in mapping the trajectory during the task operation, the trend graph display of the memory usage continuously rises, which indicates that there is a memory leak.
As shown in fig. 5, when the problem of memory leak during map track drawing is solved during task operation, the memory usage of the web browser that is drawing the map track is always kept at about 60 MB.
As shown in fig. 6, in the case of solving the memory leak problem in the mapping process, the trend graph of the memory usage shows that the memory will decrease after rising, which indicates that there is a regular release in the memory, and the memory is generally maintained in a steady state.
For a specific implementation of this embodiment, reference may be made to the relevant description in the above embodiments, which is not described herein again.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by suitable instruction execution devices. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware that is related to instructions of a program, and the program may be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
By adopting the control method, the control device, the control processor and the computer-readable storage medium for avoiding memory leakage in the process of drawing the radio Web map track, tasks related to the map track can be executed for at least 10 hours while the browser page is kept in an activated state, about 60MB of the browser is kept, and the browser is not crashed. The method can keep the monitoring task from dragging the map page to be not blocked in a long-time running state.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (8)
1. A control method for avoiding memory leakage in radio Web map track drawing is characterized by comprising the step of drawing a map linear track, and specifically comprises the following steps:
(1) initializing, receiving data drawing, drawing a linear track every 5 seconds, judging whether the interval between the current time and the last recording time is more than 5 seconds, and if so, continuing the step (2); otherwise, continuing the step (1);
(2) starting to record the frame number, and recording as itemCount;
(3) judging whether the frame number itemCount is smaller than the total frame number totalitem, if so, continuing the step (5); otherwise, continuing the step (4);
(4) removing the first dot-shaped layer feature in the feature set Features to obtain a new frame number itemCount;
(5) if the itemCount% limitPartOfitem is equal to 0, newly building a Feature of the layer, adding current longitude and latitude data into the Feature, and adding the Feature into the layer;
where% is modulo.
2. The method for realizing control of avoiding memory leak for radio Web map track drawing according to claim 1, wherein the step (1) obtains a new frame number itemCount, specifically:
the new frame number itemCount is obtained according to the following formula:
itemCount＝itemCount－limitPartOfitem×2；
wherein itemCount is the count of the current frame, and limiPartOfItem is the count of the additive line type layer Feature.
3. The method for implementing control to avoid memory leak for radio Web mapping according to claim 1, wherein the initialization in step (1) is specifically:
initializing a page, initializing resources and objects of a map linear layer, and adding the initialized linear layer to the map.
4. The method for realizing control of avoiding memory leak for radio Web mapping track drawing according to claim 1, wherein the method further comprises a step of drawing a map dotted track, specifically comprising the following steps:
(1-1) initializing, receiving data drawing, drawing a dot track every 5 seconds, judging whether the interval between the current time and the last recording time is more than 5 seconds, and if so, continuing the step (1-2); otherwise, continuing the step (1-1);
(1-2) acquiring a punctiform layer feature set;
(1-3) judging whether the length of the point layer feature set is greater than or equal to an upper limit, and if so, removing a first layer feature in the set; otherwise, continuing the step (1-1).
5. The method for implementing control to avoid memory leak for radio Web mapping according to claim 4, wherein the initialization in step (1-1) is specifically:
initializing a page, initializing resources and objects of a map point-like track layer, and adding the initialized point-like track layer to the map.
6. A control apparatus for implementing memory leak avoidance for radio Web mapping, the apparatus comprising:
a processor configured to execute computer-executable instructions;
a memory storing one or more computer-executable instructions that, when executed by the processor, perform the steps of any one of claims 1 to 5 for implementing a control method for radio Web mapping avoiding memory leaks.
7. A processor for implementing memory leak avoidance for radio Web mapping, wherein the processor is configured to execute computer-executable instructions, which when executed by the processor, implement the steps of any one of claims 1 to 5 for implementing the control method for memory leak avoidance for radio Web mapping.
8. A computer-readable storage medium, having stored thereon a computer program executable by a processor to perform the steps of any of claims 1 to 5 for implementing a method for memory leak avoidance control for radio Web mapping.
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