CN104217019A - Content inquiry method and device based on multiple stages of cache modules - Google Patents

Content inquiry method and device based on multiple stages of cache modules Download PDF

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Publication number
CN104217019A
CN104217019A CN201410495975.6A CN201410495975A CN104217019A CN 104217019 A CN104217019 A CN 104217019A CN 201410495975 A CN201410495975 A CN 201410495975A CN 104217019 A CN104217019 A CN 104217019A
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China
Prior art keywords
content
temperature
user side
module
request
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CN201410495975.6A
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Chinese (zh)
Inventor
张建辉
张校辉
莫涵
刘涛
田铭
申涓
贺磊
赵靓
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PLA Information Engineering University
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PLA Information Engineering University
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Priority to CN201410495975.6A priority Critical patent/CN104217019A/en
Publication of CN104217019A publication Critical patent/CN104217019A/en
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/24Querying
    • G06F16/245Query processing
    • G06F16/2455Query execution
    • G06F16/24552Database cache management

Abstract

The embodiment of the invention relates to a content inquiry method and a content inquiry device based on multiple stages of cache modules. The multiple stages of cache modules are respectively used for storing contents with different hotness levels; hotness represents the inquiry probability; the method comprises the steps of receiving an inquiry request of a user side, wherein the request carries a target content identification; inquiring the cache module for storing the content with the highest hotness level, if no target content exists in the cache module, inquiring the cache module for storing the content with the secondary hotness level, and operating the rest of the cache modules in the same manner until the target content is acquired; supplying the target content to the user side. During content inquiring, all the stages of the cache modules are inquired according to the hotness levels of the stored contents in sequence from high to low; the storage position of the content with the higher hotness (namely which is hotter) is more front, and the inquiring time is earlier, so that the content is easier to find. According to the scheme provided by the invention, the hit rate of the target content is increased, the inquiry time is shortened, and the working efficiency is improved.

Description

Based on the content search method and apparatus of multi-level buffer module
Technical field
The present invention relates to network communication technology field, relate to a kind of content search method and apparatus based on multi-level buffer module in particular.
Background technology
This part embodiments of the present invention be intended to for stating in claims provide background or context.Description herein can comprise the concept that can probe into, but the concept not necessarily expected or probed into before.Therefore, unless herein means out, otherwise the content described in this part is not prior art for the instructions of the application and claims, and not because be included in just admit it is prior art in this part.
Along with the development of ICT (information and communication technology), network has become the indispensable information intercourse platform of people's daily life.It is main that the content of Internet communication is transformed into multimedia (as sound, video) from static Web page, picture, makes a large amount of content need to transmit between network.In prior art, when user side carries out content search (also can be called access), by the content server acquisition object content of router to correspondence, then content is transmitted to user side.
Inventor implement the invention process in, find that above-mentioned prior art exists room for improvement, such as some by frequently inquire about content time, can the response time be shortened, reduce network resource overhead.
Summary of the invention
Inventor, in enforcement the invention process, is studied correlation technique and analyzes:
Caching technology provides a kind of effective method to make the contradiction of this resource and demand up.By some contents are stored in this locality, user are directly obtained from this locality, effectively can reduce cross-domain flow rate, save transmission bandwidth, and the response speed of user's request can be accelerated.
General all very random the need of the determination mode of buffer memory to some content in this caching technology, inventor expects adopting the foundation being queried number of times buffer memory as whether of record content, namely when inquiry times exceedes pre-determined threshold, content is carried out buffer memory.In general, the number of times be queried is more, and just represent more popular, the probability be next time queried to is larger.Inventor finds, if local cache content is more, and the content location of buffer memory is random, though then inquiry be more popular content, also may need the expensive time, therefore can also have the space of improvement in shortening the response time.
In view of this, an aspect of of the present present invention, provide a kind of content search method based on multi-level buffer module, described multi-level buffer module stores the content of different temperature rank respectively, and described temperature represents and is queried probability, and described method comprises:
Receive user side inquiry request, described request carries object content identification;
Inquiry stores the cache module that temperature is the content of highest level, if wherein do not have object content, then inquires about the cache module that temperature is other content second advanced, by that analogy, until obtain described object content;
Described object content is supplied to user side.
As can be seen from technique scheme, scheme provided by the invention arranges multi-level buffer module, be respectively used to the content object storing different temperature rank, when carrying out content search, according to the temperature rank sequential query from high to low cache module at different levels of stored content, the content location of temperature higher (namely more popular) is more forward, and the time be queried is also more forward, is therefore more easily searched.So scheme provided by the invention improves the hit rate of object content, shorten query time, improve work efficiency.
In some embodiments, also comprise the temperature forecasting process for the content stored in cache module at different levels, this process comprises:
Statistical history information, adds up content object i with time interval T, is designated as V 1, V 2..., V n-1, V n, with V (t) represent respectively [0, T), [T, 2T) ... [(n-1) T, nT), [nT, t) the inquiry request number of times in, and determine Fs=Vs/T, s=1,2 ..., n, and represent the request frequency of corresponding time period with F (t)=V (t)/(t-nT), then content object i can be expressed as in the temperature of moment t:
A i(t)=αF(t)+(1-α)(F n+F n-1+…+F n-k+2+F n-k+1)
Wherein:
α is weighting parameter, and 0< α <1, K are the width of moving window, the number of namely got time interval T.
This programme carries out the temperature prediction storing content, the renewal on memory location can be carried out according to the content of the result of prediction to storage, due to the dynamic of user side inquiry request, " popularity degree " of the content (i.e. object content) asked often changes in time, this programme carries out content temperature and predicts the mode that line position of going forward side by side upgrades when receiving inquiry request, be conducive to the most popular current content to be stored in the position more easily obtained, further increase the hit rate of object content.
Preferably, in such scheme, also comprise:
In each cache module obtained according to above-mentioned temperature forecasting process, the temperature of each content object, upgrades the memory location of each content object.
Preferably, in such scheme, described temperature forecasting process starts when receiving user side inquiry request.
Preferably, in such scheme, after reception user side inquiry request, carry out parsing and determine type of service, describedly described object content is supplied to user side is: described object content is sent to user side according to after described type of service encapsulation.
On the other hand, provide a kind of content search device based on multi-level buffer module, described multi-level buffer module stores the content of different temperature rank respectively in the present invention, and described temperature represents and is queried probability, and described device comprises:
Request reception unit, for receiving user side inquiry request, described request carries object content identification;
Enquiry module, stores for inquiring about the cache module that temperature is the content of highest level, if wherein do not have object content, then inquires about the cache module that temperature is other content second advanced, by that analogy, until obtain described object content;
Content feed unit, for being supplied to user side by described object content.
This programme with method part is corresponding above, as the concrete device of the one realizing method part above.
summary of the invention
The invention provides a kind of content search scheme based on multi-level buffer module, described multi-level buffer module stores the content of different temperature rank respectively, when carrying out content search, the order of inquiry is carried out according to the temperature rank order from high to low of the content stored, the probability be queried due to the content that temperature rank is higher is larger, therefore content higher for temperature rank is stored in the position of more easily reading, the hit rate of inquiry can be improved.
After describing ultimate principle of the present invention, lower mask body introduces various non-limiting embodiment of the present invention.
application scenarios overview
With reference to figure 1, it is the block schematic illustration of an exemplary application scene of embodiment of the present invention.
User is by the request of input equipment 11 input inquiry, this inquiry request mails to intermediate equipment 13 by terminal device 12, this intermediate equipment 13 sends inquiry request according to the temperature rank order from high to low of the content stored to multi-level buffer module 14, terminal device 12 is fed back to after obtaining object content, object content is presented to user by terminal device 12, if do not get object content from multi-level buffer module 14, then send inquiry request by terminal device 12 to router one 5, obtained by router source server 16 externally.Described multi-level buffer module 14 comprises the first cache module Cache1, the second cache module Cache2 ..., the n-th cache module Cache n.Wherein:
Cache1 stores the content object of temperature rank the highest (1 grade), and Cache2 stores the content object that temperature rank is 2 grades, and Cache n stores the content object of temperature rank minimum (n rank).
The quantity of every one-level content object can be one or more.
illustrative methods
Below in conjunction with the application scenarios of Fig. 1, be described with reference to Figure 2 the content search method according to exemplary embodiment of the invention.It should be noted that above-mentioned application scenarios is only that embodiments of the present invention are unrestricted in this regard for the ease of understanding spirit of the present invention and principle and illustrating.On the contrary, embodiments of the present invention can be applied to applicable any scene.
Suppose that cache module is made up of Cache1, Cache2 and Cache3.
Shown in figure 2, shown flow process such as can comprise the following steps:
Step S21, receive content query requests from user side.
Step S22, determine asked object content identification.
Step S23, judge whether store described object content in described first cache module (Cache1), if so, enter step S24, otherwise, enter step S25.
Step S24, described object content is returned to described user side.
Step S25, judge whether store described object content in described second cache module (Cache2), if so, return step S24, otherwise, enter step S26.
Step S26, judge whether store described object content in described 3rd cache module (Cache3), if so, return step S24, otherwise, enter step S27.
Step S27, to router send inquiry request, be transmitted to external source server by router.
What step S28, acquisition router forwarded returns to user side from after the object content of source server.
Described intermediate equipment can be the equipment of user side this locality, also can be the network equipment of distance users end close together on network.
Below for L2 cache (namely cache module comprises Cache1 and Cache2), provide a kind of comparatively concrete scheme, Fig. 3 illustrates its process flow diagram, as shown in the figure, comprises the following steps:
Step S301, user side send content query requests to intermediate equipment.
Described content query requests carries type of service and object content identification (this content identification can be name or numbering).
Step S302, intermediate equipment resolve described content query requests.
Intermediate equipment carries out protocol analysis to described content query requests, identifies its type of service and entrained object content identification.
Described object content whether is had in step S303, intermediate equipment query cache 1, if enter step S304, otherwise, enter step S306.
Step S304, intermediate equipment obtain described object content.
Step S305, send to user side by after described object content package.
The type of service that described object content parses according to step S302 is encapsulated, then sends to user side.
Step S306, intermediate equipment send inquiry request to Cache2, if having described object content in Cache2, enter with regard to step S307, otherwise, enter step S309.
Described inquiry request carries object content identification.
Step S307, intermediate equipment obtain described object content.
Step S308, intermediate equipment send to user side by after described content package.
Object content proposes from Cache1 by step S307, intermediate equipment, sends to user side after encapsulation.
Step S309, send the failed information of inquiry to user side.
Step S310, user side send inquiry request to router.
Step S311, router send inquiry request to source server.
Described inquiry request carries object content identification equally.
Step S312, source server are to router feedback object content.
Step S313, router send to user side by after described object content package.
In other embodiments, the content of step S309 ~ step S313 can be: send inquiry request to router between intermediate equipment, be transmitted to source server by router.Intermediate equipment is supplied to user side after router obtains the object content that provides of source server.
Can also according to certain rule in other embodiments, such as timing or under the triggering (such as receiving inquiry request) of certain event, carry out predicting the temperature of content object in cache module, and the memory location of content object in cache module is upgraded.Temperature refers to the possibility be queried.
Temperature forecasting process can be as follows:
Statistical history information, adds up content object i with time interval T, is designated as V 1, V 2..., V n-1, V n, with V (t) represent respectively [0, T), [T, 2T) ... [(n-1) T, nT), [nT, t) the inquiry request number of times in, and determine Fs=Vs/T, s=1,2 ..., n, and the request frequency of corresponding time period is represented with F (t)=V (t)/(t-nT), as shown in Figure 4, then content object i can be expressed as in the temperature of moment t:
A i(t)=αF(t)+(1-α)(F n+F n-1+…+F n-k+2+F n-k+1)
Wherein:
α is weighting parameter, and 0< α <1, K are the width of moving window, the number of namely got time interval T.
Described weighting parameter, for adjusting the weight of ongoing frequency and historical frequency, can be empirical parameter, adjust as required.
Due to the dynamic of user side inquiry request, " popularity degree " of the content (i.e. object content) of asking often changes in time.By sliding window mechanism, content temperature can reflect the change of user's inquiry request adaptively, thus the renewal can carrying out content object in cache module is replaced, such as, content object the highest for temperature is positioned over the position being easy to most search.And the finite capacity of cache module, can delete by the temperature content object that is arranged in position comparatively, or by the object content to replace of corresponding current queries request.
example devices
After the content search method describing exemplary embodiment of the invention, next, shown in figure 5, for a kind of embodiment of the device of exemplary embodiment of the invention, corresponding foregoing querying method, comprise request reception unit 51, enquiry module 52 and content feed unit 53, wherein:
Described request receiving element 51 is for receiving user side inquiry request, and described request carries object content identification.
Described enquiry module 52 stores for inquiring about the cache module that temperature is the content of highest level, if wherein do not have object content, then inquires about the cache module that temperature is other content second advanced, by that analogy, until obtain described object content.
Content feed unit 53, for being supplied to user side by described object content.
Described multi-level buffer module comprises the first cache module Cache1, the second cache module Cache2 ..., the n-th cache module Cache n.Wherein:
Cache1 stores the content object of temperature rank the highest (1 grade), and Cache2 stores the content object that temperature rank is 2 grades, and Cache n stores the content object of temperature rank minimum (n rank).
The quantity of every one-level content object can be one or more.
Described enquiry module 52 is checked and accepted unit 51 from described request and is recognized the content (object content) that user side will be inquired about, first query cache 1, if there is no object content in Cache1, then continue query cache 2, if there is no object content in Cache2, then downward level cache module polls, if still there is no object content in afterbody cache module (Cache n), then by router externally source server send inquiry request to obtain object content.
In addition, described enquiry module 52, when all cache modules all do not have storage purpose content, searches failure information to client feeds back, by user side by router externally source server transmission inquiry request, to obtain object content, as shown in Figure 6.
In certain embodiments, described device is according to certain rule, such as timing or under the triggering (such as receiving inquiry request) of certain event, carry out the prediction of the temperature to content object in cache module, and arrange according to temperature order from high to low for each content object.
Fig. 7 shows a kind of possible structure, on the basis of above-mentioned Fig. 5 or Fig. 6, set up temperature predicting unit 71 and update module 72, described temperature predicting unit 71 is for carrying out temperature prediction to the content stored in cache module at different levels, described temperature prediction comprises: statistical history information, with time interval T, content object i is added up, be designated as V 1, V 2..., V n-1, V n, with V (t) represent respectively [0, T), [T, 2T) ... [(n-1) T, nT), [nT, t) the inquiry request number of times in, and determine Fs=Vs/T, s=1,2 ..., n, and represent the request frequency of corresponding time period with F (t)=V (t)/(t-nT), then content object i can be expressed as in the temperature of moment t:
A i(t)=αF(t)+(1-α)(F n+F n-1+…+F n-k+2+F n-k+1)
Wherein:
α is weighting parameter, and 0< α <1, K are the width of moving window, the number of namely got time interval T.
Described update module 72, for the temperature of each content object in each cache module of obtaining according to above-mentioned temperature forecasting process, upgrades the memory location of each content object.
In the structure that other is possible, described content search device can also comprise the parts triggering temperature predicting unit 71 and work, as shown in Figure 8, on the basis of Fig. 7, described content search device also comprises triggering indicating member 81, for when described request receiving element 51 receives user side inquiry request, send trigger message and work to trigger described temperature predicting unit 71.
In some more specifically structure, described content search device also comprises: deep-packet detection module and business packed module, wherein:
Described deep-packet detection module, for the inquiry request received described request receiving element 51, carries out protocol analysis, and identification services type also determines object content.
This object content package, before feeding back object content at described content feed unit 53, is the packet mated with described type of service by described business packed module.
The content search device that the present embodiment provides is corresponding with foregoing description querying method, can use for reference mutually and supplement each other.
It should be noted that, in this instructions, each embodiment can be supplemented mutually, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
In addition, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 schematically shows the framework according to an embodiment of the present invention application scenarios in actual applications;
Fig. 2 schematically shows the flow process of content search method one embodiment provided by the present invention;
Fig. 3 schematically shows the flow process of another embodiment of content search method provided by the present invention;
Fig. 4 schematically shows the flow process of carrying out the prediction of content object temperature in content search method provided by the present invention;
Fig. 5 schematically shows the structure of content search device one embodiment provided by the present invention;
Fig. 6 ~ Fig. 8 schematically shows the structure of several embodiment of content search device provided by the present invention.
Embodiment
Below with reference to the process flow diagram of the method for embodiment of the present invention and the block diagram of equipment (or system), embodiments of the present invention are described.Should be appreciated that the combination of each square frame in each square frame of process flow diagram and/or block diagram and process flow diagram and/or block diagram can be realized by computer program instructions.These computer program instructions can be supplied to the processor of multi-purpose computer, special purpose computer or other programmable data treating apparatus, thus produce a kind of machine, these computer program instructions are performed by computing machine or other programmable data treating apparatus, create the device of the function/operation specified in the square frame in realization flow figure and/or block diagram.
Also can these computer program instructions be stored in the computer-readable medium that computing machine or other programmable data treating apparatus can be made to work in a specific way, like this, the instruction be stored in computer-readable medium just produces the product of the command device of the function/operation specified in a square frame comprising in realization flow figure and/or block diagram.
Also can computer program instructions be loaded on computing machine, other programmable data treating apparatus or miscellaneous equipment, make to perform sequence of operations step on computing machine, other programmable data treating apparatus or miscellaneous equipment, to produce computer implemented process, thus make the instruction performed on computing machine or other programmable device can provide the process of the function/operation specified in the square frame in realization flow figure and/or block diagram.
According to the embodiment of the present invention, a kind of content search method and apparatus based on multi-level buffer module is proposed.Any number of elements in accompanying drawing is all unrestricted for example, and any name is all only for distinguishing, and does not have any limitation.
Below with reference to some representative embodiments of the present invention, explaination principle of the present invention and spirit in detail.

Claims (10)

1. based on a content search method for multi-level buffer module, it is characterized in that, described multi-level buffer module stores the content of different temperature rank respectively, and described temperature represents and is queried probability, and described method comprises:
Receive user side inquiry request, described request carries object content identification;
Inquiry stores the cache module that temperature is the content of highest level, if wherein do not have object content, then inquires about the cache module that temperature is other content second advanced, by that analogy, until obtain described object content;
Described object content is supplied to user side.
2. content search method according to claim 1, is characterized in that, also comprise the temperature forecasting process for the content stored in cache module at different levels, this process comprises:
Statistical history information, adds up content object i with time interval T, is designated as V 1, V 2..., V n-1, V n, with V (t) represent respectively [0, T), [T, 2T) ... [(n-1) T, nT), [nT, t) the inquiry request number of times in, and determine Fs=Vs/T, s=1,2 ..., n, and represent the request frequency of corresponding time period with F (t)=V (t)/(t-nT), then content object i can be expressed as in the temperature of moment t:
A i(t)=αF(t)+(1-α)(F n+F n-1+…+F n-k+2+F n-k+1)
Wherein:
α is weighting parameter, and 0< α <1, K are the width of moving window, the number of namely got time interval T.
3. content search method according to claim 2, is characterized in that, also comprise:
In each cache module obtained according to above-mentioned temperature forecasting process, the temperature of each content object, upgrades the memory location of each content object.
4. the content search method according to Claims 2 or 3, is characterized in that, described temperature forecasting process starts when receiving user side inquiry request.
5. content search method according to claim 1, it is characterized in that, after reception user side inquiry request, carry out parsing and determine type of service, describedly described object content is supplied to user side is: described object content is sent to user side according to after described type of service encapsulation.
6. based on a content search device for multi-level buffer module, it is characterized in that, described multi-level buffer module stores the content of different temperature rank respectively, and described temperature represents and is queried probability, and described device comprises:
Request reception unit, for receiving user side inquiry request, described request carries object content identification;
Enquiry module, stores for inquiring about the cache module that temperature is the content of highest level, if wherein do not have object content, then inquires about the cache module that temperature is other content second advanced, by that analogy, until obtain described object content;
Content feed unit, for being supplied to user side by described object content.
7. device according to claim 6, is characterized in that, also comprises:
For carrying out the temperature predicting unit of temperature prediction to the content stored in cache module at different levels, described temperature prediction comprises: statistical history information, adds up, be designated as V with time interval T to content object i 1, V 2..., V n-1, V n, with V (t) represent respectively [0, T), [T, 2T) ... [(n-1) T, nT), [nT, t) the inquiry request number of times in, and determine Fs=Vs/T, s=1,2 ..., n, and represent the request frequency of corresponding time period with F (t)=V (t)/(t-nT), then content object i can be expressed as in the temperature of moment t:
A i(t)=αF(t)+(1-α)(F n+F n-1+…+F n-k+2+F n-k+1)
Wherein:
α is weighting parameter, and 0< α <1, K are the width of moving window, the number of namely got time interval T.
8. device according to claim 7, is characterized in that, also comprises:
Update module, for the temperature of each content object in each cache module of obtaining according to above-mentioned temperature forecasting process, upgrades the memory location of each content object.
9. the device according to claim 7 or 8, is characterized in that, also comprises:
Trigger indicating member, for when described request receiving element receives user side inquiry request, send trigger message to trigger the work of described temperature predicting unit.
10. the device according to claim 6 ~ 9 any one, is characterized in that, also comprises:
Deep-packet detection module, for the inquiry request received described request receiving element, carries out protocol analysis, and identification services type also determines object content;
This object content package, for before described content feed unit feedback object content, is the packet mated with described type of service by business packed module.
CN201410495975.6A 2014-09-25 2014-09-25 Content inquiry method and device based on multiple stages of cache modules Pending CN104217019A (en)

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