CN104618450A - Wireless Local Area Networks (WLAN) Web caching system and method - Google Patents
Wireless Local Area Networks (WLAN) Web caching system and method Download PDFInfo
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Abstract
The invention provides a WLAN Web caching system. The system comprises a cache controller and two or more than two Access Point (AP). The AP is used for receiving the requirement of the WLAN user for internet information to obtain a required object and send the object to the user; the cache controller is used for obtaining the requirement from the AP, obtains the required object or information about the required object position according to the global cache abstract and sends the information to the AP. The invention further provides a method based on the system. By means of the technical scheme, centralized control few in storage redundancy can be achieved, calculation and storage resources of the AP in the WLAN are fully used, the system obtains good extendibility, and effects of the system on the gateway stability are reduced.
Description
Technical field
The present invention relates to computer network transmission control field, specifically, the present invention relates to network information buffer memory (Web buffer memory) system and method for a kind of WLAN (wireless local area network) (WLAN).
Background technology
WLAN (wireless local area network) (Wireless Local Area Networks, WLAN) uses radio wave to carry out the local area network (LAN) connected as data transport media.A simple WLAN is made up of two kind equipments: wireless stations (Station, STA) and access point (Access Point, AP).STA is the terminal be connected in wireless network, i.e. user; AP is to provide wireless stations to cable LAN with from the equipment of cable LAN to the access of wireless stations.
Network information buffer memory (Web Cache, or Web buffer memory) technology is on the basis of existing network framework, utilize the method for transmission localization, the technology using to reach optimized network bandwidth, improve network service quality, strengthen the object of network availability.The application of Web caching technology, except providing temporary file buffer memory to improve except the scheme of browse efficiency with browser itself, the most frequently used technical scheme disposes proxy server.Transparent proxy server (not needing client manual configuration to act on behalf of) must be deployed in gateway, mail to web page server (web sever receiving client, or Web server) request after, it first checks that can self meet this request, if can, just be supplied to user by being stored in local info web, and acquisition of need not getting on from the Internet; If the content of user's request is not stored in this locality, the request forward of user is just given corresponding Web server by proxy server.The page that web server response user request sends user to first can arrive proxy server.The page can leave in local buffer memory by proxy server, and then it is transmitted to corresponding client.
Traditional Web caching technology scheme never considers the concrete deployment way applying Web caching system in the concrete scene of WLAN.But, when being used in large-scale organization, in WLAN, hundreds and thousands of AP may be comprised, thinking that a large amount of users provides services on the Internet.Under this concrete scene, traditional Web caching system deployment scheme will be met difficulty.If dispose proxy server at gateway, as shown in Figure 1, so the proxy server of gateway needs to intercept and capture by facing and processes in a large number from the situation of the request of user in local area network (LAN).Because proxy server needs the copy preserving user's request content in the buffer memory of self, the large young pathbreaker of the buffer memory ability of proxy server directly restricts the extensibility of whole system, forming property bottleneck.Meanwhile, proxy server needs to be deployed in gateway, and its instability even fault may affect the stable of gateway thus damage the network quality of whole WLAN.If dispose proxy server independently on single AP, as shown in Figure 2, so the effect of Web buffer memory can be severely limited by the limited calculating of single AP and storage resources, simultaneously, will there is the cache contents of a large amount of repeated and redundant in the AP of WLAN, the operating efficiency of whole system is also undesirable.If a large amount of AP in a wlan dispose proxy server in a distributed manner, as shown in Figure 3, if adopt (the Internet Cache Protocol of communication protocol between buffer memory between AP, ICP) cache contents is each other inquired about mutually according to the mode of poll round, so each AP can only work in coordination with buffer memory with limited neighbor point, and the quantity of ICP message also sharply can increase along with the increase of AP quantity, affects the effect of caching system, thus the extensibility of restriction whole system.If adopt cache object information content summary (Cache Digests) technology between AP, so each AP needs the buffer memory of all AP in Maintain LAN to make a summary, each AP needs and performs many summaries in local area network (LAN) between other all AP to upgrade and simultaneous operation simultaneously, this will bring storage extra in a large number and network overhead, affects the operating efficiency of caching system and realizes effect.
Therefore, existing Web caching system deployment way has the shortcomings such as poor expandability, resource availability be low under the WLAN scene with a large amount of AP.
Summary of the invention
The object of this invention is to provide one and can overcome above-mentioned technical problem, for WLAN application scenarios, carry out the solution of centerized fusion distributed storage.
The invention provides network information buffer memory (Web buffer memory) system of a kind of WLAN (wireless local area network) (WLAN), comprising:
A cache controller and two or more AP;
Described AP, for receiving the request of described wireless local network user to internet information, obtains the object of asking, and described object is sent to described user;
Described cache controller, for obtaining the request from described AP, and according to global buffer summary, the information of the object that acquisition is asked or the position about asked object place, and send it to described AP;
Wherein, described global buffer summary, for preserving the buffer memory summary of all described AP in local area network (LAN).
Preferably, described AP is also for upgrading the buffer memory summary of own cache, and by cache controller described in described update notification, and to carry out summary synchronous with described cache controller; Described cache controller is also for upgrading described global buffer summary according to the notice of described AP, to carry out summary synchronous with described AP.
Preferably, described cache controller can dispose addressable optional position, IP address in a wlan, is opaque for described AP.
Preferably, described cache controller the form of Transparent proxy server of AP can also be deployed in the gateway of WLAN.
Present invention also offers the method for the system of disposing addressable optional position, IP address in a wlan (be opaque for described AP) for above-mentioned cache controller, described method comprises:
Step 102, AP receives user to the request of internet information;
Step 104, when asked object is not in the buffer memory of described AP, described request is transmitted to described cache controller by described AP;
Step 106, the information of the position about described object place is sent to described AP according to global buffer summary and the request from described AP by described cache controller;
Step 108, described AP is object according to the acquisition of information of the described position about described object place received;
Step 110, described object is sent to described user by described AP.
Preferably, described step 106 comprises further, and when there is the positional information of described object in described global buffer summary, the positional information of object described in described global buffer summary is sent to described AP by described cache controller; Described step 108 comprises further, and described AP, according to the described positional information from described cache controller, obtains described object from other AP preserving described object.
Preferably, described step 106 comprises further, and when there is not the positional information of described object in described global buffer summary, the positional information of described object in the Internet is sent to described AP by described cache controller; Described step 108 comprises further, and described AP, according to the described positional information about described object place from described cache controller, obtains described object from the assigned address the Internet.
Preferably, described step 108 comprises further: described AP is by the buffer memory of the copy of described object stored in described AP; Or described AP is by the buffer memory of the copy of described object stored in described AP, and by cache controller described in the update notification of described buffer memory, described cache controller upgrades described global buffer summary according to described notice.
Preferably, described method also comprises: when described AP eliminates the certain content in its buffer memory, and described cache controller upgrades accordingly to described global buffer summary; And/or when network is idle, it is synchronous that described cache controller and described AP carry out summary.
Present invention also offers the method for the system of the gateway being deployed in WLAN for aforementioned cache controller with the form of the Transparent proxy server of AP, described method comprises:
Step 202, AP receives user to the request of internet information;
Step 204, when asked object is not in the buffer memory of described AP, described AP sends new request to the Internet assigned address that described request is pointed to;
Step 206, described cache controller intercepts and captures the described new request from described AP, and obtains described object according to global buffer summary;
Step 208, described object is sent to described AP by described cache controller;
Step 210, the described object obtained is sent to described user by described AP.
Preferably, described step 206 comprises further: when there is the positional information of described object in described global buffer summary, and described cache controller obtains described object according to the positional information of object described in described global buffer summary from other AP preserving described object.
Preferably, described step 206 comprises further: when there is not the positional information of described object in described global buffer summary, and the Internet assigned address that described cache controller points to from described new request obtains described object.
Preferably, described step 208 comprises further: described AP is by the buffer memory of the copy of described object stored in described AP; Or described AP is by the buffer memory of the copy of described object stored in described AP, and by cache controller described in the update notification of described buffer memory, described cache controller upgrades described global buffer summary according to described notice.
Preferably, described method can also comprise: when described AP eliminates the certain content in its buffer memory, and described cache controller upgrades accordingly to described global buffer summary; And/or when network leaves unused, it is synchronous that described cache controller and described AP carry out summary.
Compared with prior art, the technical scheme that the present invention proposes has the following advantages:
Technical scheme of the present invention can realize the few centerized fusion of storage redundancy, make full use of calculating and the storage resources of each AP in WLAN, make the Web caching system in WLAN obtain good extensibility, reduce the impact of caching system for gateway stability.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, be briefly described by the accompanying drawing used required in describing embodiment below, apparently, the accompanying drawing in the following describes is not formed for restriction of the present invention.
Fig. 1 is the Web caching system schematic diagram disposing the WLAN of proxy server in prior art at gateway;
Fig. 2 is the Web caching system schematic diagram independently disposing the WLAN of proxy server in prior art at single AP place;
Fig. 3 is the Web caching system schematic diagram at the WLAN of AP place distributed deployment proxy server in prior art;
Fig. 4 is the schematic flow sheet of the Web caching method of a kind of WLAN of the embodiment of the present invention one;
Fig. 5 is the configuration diagram of the Web caching system of a kind of WLAN of the embodiment of the present invention one;
Fig. 6 is the logical relation schematic diagram of cache controller and AP in the Web caching system of the WLAN of the embodiment of the present invention one;
Fig. 7 is that in the Web caching system of the WLAN of the embodiment of the present invention, AP carries out with cache controller synchronous schematic flow sheet of making a summary;
Fig. 8 is the schematic flow sheet of the Web caching method of a kind of WLAN of the embodiment of the present invention two;
Fig. 9 is the configuration diagram of the Web caching system of a kind of WLAN of the embodiment of the present invention two.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention done and describe further.
Embodiment one
Fig. 5 shows the Web caching system of a kind of WLAN that the embodiment of the present invention one provides, and comprises and is in a cache controller 502 in same local area network (LAN) and at least two AP.According to one embodiment of present invention, AP place is deployed with proxy server.Preferably, the proxy server that AP place disposes is Transparent proxy server, can select arbitrary deployment way, such as be deployed in router one deck, or be deployed in switch one deck, etc.Cache controller 502 is deployed in the optional position that in local area network (LAN), IP can reach, and such as bypass is articulated under gateway, or is articulated under certain switch of Intranet or router.
The logical relation of cache controller 502 and AP, as shown in Figure 6, cache controller 502 is parent proxy servers of AP, opaque to AP, AP needs pre-configured parent proxy server (i.e. cache controller 502), therefore cache controller 502 can be deployed in local area network (LAN) the position that IP arbitrarily can reach, and need not be deployed in gateway, thus avoids and affect gateway due to the fault of buffer control and stablize with the risk of induced damage resistive network quality.And AP place is owing to being deployed with Transparent proxy server as its sub-level proxy server, its object obtained from relevant position, the Internet according to the request received can be kept at its buffer memory by the AP therefore in the present embodiment, and generates and safeguard the buffer memory summary of its buffer memory.Preferably, AP can use cache object information content summary (CacheDigests) data format generate and safeguard that its buffer memory is made a summary.
Cache controller 502 needs the information according to comprising the global buffer summary of making a summary from the buffer memory of AP all in local area network (LAN) to run.This global buffer summary can be directly stored in cache controller 502.As shown in Figure 6, according to one embodiment of present invention, cache controller 502 can comprise summary administration module 602 and communication module 604.Summary administration module 602 is for preserving and managing described global buffer summary.Preferably, administration module 602 of making a summary can use Cache Digest data format to preserve described global buffer summary.Communication module 604 is for obtaining and reply the inquiry request from AP, and buffer memory summary update notification.Preferably, communication module 604 use corresponding ICP agreement to obtain and response from the inquiry request of AP in local area network (LAN) and buffer memory summary update notification, to reduce time delay, save bandwidth.Though not shown in Fig. 6, but according to another embodiment of the invention, described global buffer summary also can be stored in independently among memory device, and cache controller 502 can be made a summary to described global buffer and inquires about and safeguard by being carried out communication with this memory device.
Following reference diagram 4 and Fig. 5, and composition graphs 6 and Fig. 7 illustrate the specific works flow process of the Web caching system of the WLAN of the embodiment of the present invention one, it comprises the steps:
Step 402, AP506 receives the request 512 of user's 504 pairs of internet informations, request object M;
Step 404, judges whether object M exists in the buffer memory of AP506, if exist, enters step 414; If do not exist, enter step 406;
Step 406, AP506 use ICP agreement sends inquiry request 514 to cache controller 502 and continues request object M;
Step 408, cache controller 502 obtains inquiry request 514 by communication module 604, and summary administration module 602 inquires about in global buffer summary whether there is the information N corresponding with object M according to inquiry request 514, if query hit, enters step 410; If query missed, enter step 412;
Step 410, the result of information N and query hit is returned to AP506 by communication module 604, after AP506 receives the result of query hit, sends request 516 acquisition object M, and enter step 414 according to information N to the AP508 being cached with object M;
Step 412, the result of query missed is returned to AP506 (namely notifying that AP506 need ask the position acquisition object M of 512 sensings from user) by communication module 604, summary administration module 602 prepares to upgrade global buffer summary, after AP506 receives the result of query missed, 518 acquisition object M are sent request to the webserver 510 according to request 512, and after acquisition object M, the copy of object M is saved in the buffer memory of himself, upgrade its corresponding buffer memory summary, then use corresponding ICP agreement that the update notification that this buffer memory is made a summary is sent to cache controller 502, the communication module 604 of cache controller 502 receives the buffer memory summary update notification from AP506, summary administration module 602 upgrades global buffer summary accordingly according to this notice,
Step 414, object M is transmitted to user 504 by AP506.
AP506 can also carry out validation to himself cache contents and renewal.When AP506 eliminates the certain content in its buffer memory, AP506 also upgrades its corresponding buffer memory summary, and the update notification that this buffer memory is made a summary is sent to cache controller 502, the communication module 604 of cache controller 502 receives the buffer memory summary update notification from AP506, and summary administration module 602 upgrades global buffer summary accordingly according to this notice.
When network leaves unused, summary can also be carried out synchronous between AP506 and cache controller 502, be consistent with the content of appropriate section in the global buffer summary of the buffer memory summary and cache controller 502 of guaranteeing AP506, especially restart at AP506 or cache controller 502, or buffer memory summary therebetween upgrades unsuccessfully, etc. in situation.As shown in Figure 7, AP506 flow process synchronous with the summary of cache controller 502 is as follows:
Step 702, when summary synchronously starts, AP506 obtains cryptographic Hash A according to the buffer memory digest calculations of self, and cryptographic Hash A is sent to cache controller 502, or the cryptographic Hash that the communication module 604 of cache controller 502 asks its buffer memory to be made a summary to AP506, AP506 calculates the cryptographic Hash A of himself buffer memory summary according to this request, and is returned to cache controller 502;
Step 704, the communication module 604 of cache controller 502 receives the cryptographic Hash A from AP506, and summary administration module 602 calculates according to corresponding part of making a summary with the buffer memory of AP506 in global buffer summary and obtains cryptographic Hash B;
Step 706, the summary administration module 602 of cache controller 502 judges that whether cryptographic Hash A is consistent with cryptographic Hash B, if cryptographic Hash A is consistent with cryptographic Hash B, then confirm AP506 buffer memory summary make a summary with the global buffer of cache controller 502 in appropriate section consistent, same to EOS; If cryptographic Hash A and cryptographic Hash B is inconsistent, then the communication module 604 of cache controller 502 sends the complete buffer memory summary of AP506 self again to AP506 request, and enters step 708;
Step 708, its complete buffer memory summary is sent to cache controller 502 by AP506, and the summary administration module 602 of cache controller 502 upgrades the appropriate section of global buffer summary, same EOS according to the buffer memory summary of the AP506 received.
Apply the Web caching system of above-mentioned WLAN, cache controller can be deployed in local area network (LAN) the position that IP arbitrarily can reach, and need not be deployed in gateway, thus avoids and affect gateway due to the fault of buffer control and stablize with the risk of induced damage resistive network quality.Cache controller is only born the task of safeguarding that global buffer is made a summary and prepares a large amount of memory space without the need to the copy for preserving request object, dispose the way of proxy server relative to adopting traditional approach at gateway and substantially reduce the concentrated storage pressure that a large number of users request brings, and then improve the extensibility of whole system.Simultaneously, in the buffer memory of copy distributed and saved all AP in a wlan of actual request object, AP only needs the buffer memory summary safeguarding himself, and only upgrade summary with between cache controller, thus eliminate existing distributed Web caching method owing to needing each AP to preserve and safeguard the storage burden of the buffer memory summary of all AP of whole network and upgrade a large amount of network overheads of summary each other, and then efficiently utilize calculating and the storage resources of a large amount of AP, improve the operating efficiency of whole system.
It should be noted that, the cache controller in above-described embodiment can be deployed in the position that in local area network (LAN), any IP can reach, and is opaque, need not be deployed in gateway to AP.If cache controller according to the present invention is deployed in gateway as the Transparent proxy server of AP, logically see, cache controller will be no longer the parent proxy server of AP, and this will be brought certain change based on caching system of the present invention, forms embodiments of the invention two.
Embodiment two
Fig. 9 shows the Web caching system of a kind of WLAN of the embodiment of the present invention two, comprises and is in a cache controller 902 in same local area network (LAN) and at least two AP.Similar with above-described embodiment one, according to one embodiment of present invention, AP place is deployed with proxy server.Preferably, the proxy server that AP place disposes can be Transparent proxy server, can select arbitrary deployment way, such as be deployed in router one deck, or be deployed in switch one deck, etc.Cache controller 902 can obtain from relevant position, the Internet according to the request of intercepting and capturing and send to its object to be kept at the buffer memory of oneself by AP, and generates and safeguard that the buffer memory of its buffer memory is made a summary.Preferably, AP can use Cache Digest data format generate and safeguard that its buffer memory is made a summary.
Cache controller 902 is deployed in gateway as the Transparent Proxy of AP.Cache controller 902 needs the information according to comprising the global buffer summary of making a summary from the buffer memory of AP all in local area network (LAN) to run.This global buffer summary can be directly stored in cache controller 902.According to one embodiment of present invention, cache controller 902 is preserved and is managed described global buffer summary, and intercepts and captures the request that AP sends to relevant position, the Internet.Preferably, cache controller 902 can use CacheDigest data format to preserve this global buffer summary, uses corresponding ICP agreement to obtain and replys the buffer memory summary update notification from AP.Though not shown in Fig. 9, but according to another embodiment of the invention, described global buffer summary also can be stored in independently among memory device, and cache controller 902 can be made a summary to described global buffer and inquires about and safeguard by being carried out communication with this memory device.
Following reference diagram 8 and Fig. 9, the specific works flow process of the Web caching system of the WLAN of the embodiment of the present invention two is described, it comprises the steps:
Step 802, AP904 receives the request 910 of user's 906 pairs of internet informations, request object I;
Step 804, judges whether object I exists in the buffer memory of AP904, if exist, enters step 814; If do not exist, enter step 806;
Step 806, AP904 sends request 912 according to request 910 to the webserver 908.The cache controller 902 being deployed in gateway intercepts and captures request 912;
Step 808, cache controller 902 inquires about in global buffer summary whether there is the information J corresponding with object I according to request 912, if query hit, enters step 810; If query missed, enter step 812;
Step 810, cache controller 902 sends request 916 acquisition object I according to information J to the AP918 being cached with object I, and the information of object I and query hit is transmitted to AP904, AP904 determines the copy of not conservation object I according to the information of query hit, and enters step 814;
Step 812, cache controller 902 prepares to upgrade global buffer summary, and send request 914 acquisition object I according to request 912 to the webserver 908, and the information of object I and query missed is transmitted to AP904, AP904 is according to the information of query missed, object I is determined to be saved in the buffer memory of himself, upgrade its corresponding buffer memory summary, the update notification cache controller 902 of then this buffer memory being made a summary, cache controller 902 upgrades global buffer summary accordingly according to this notice;
Step 814, object I is returned to user 906 by AP904.
AP904 can also carry out validation to himself cache contents and renewal.When AP904 eliminates the certain content in its buffer memory, AP904 also upgrades its corresponding buffer memory summary, and the update notification that this buffer memory is made a summary is sent to cache controller 902, cache controller 902 receives the buffer memory summary update notification from AP904, and upgrades accordingly global buffer summary according to this notice.
When network leaves unused, summary can be carried out synchronous between AP904 and cache controller 902, be consistent with the content of appropriate section in the global buffer summary of the buffer memory summary and cache controller 902 of guaranteeing AP904, especially restart at AP904 or cache controller 902, or buffer memory summary therebetween upgrades unsuccessfully, etc. in situation.The synchronous flow process of this summary is basically identical with the synchronous flow process of summary described in above-described embodiment one, still as shown in Figure 7, so place repeats no more.
Method and system described in application above-described embodiment two, AP in WLAN still only needs the buffer memory summary safeguarding himself, and only upgrade summary with between cache controller, thus eliminate existing distributed Web caching method owing to needing each AP to preserve and safeguard the storage burden of the buffer memory summary of all AP of whole network and upgrade a large amount of network overheads of summary each other.Meanwhile, cache controller does not preserve the copy of any request object, and then greatly reduces the storage demand for cache controller.Therefore, although in the present embodiment, cache controller is deployed in gateway, but dispose the way of proxy server relative to adopting traditional approach at gateway, cache controller in this embodiment substantially reduces the concentrated storage pressure asking in a large number to bring, and then reduce and affect gateway due to the fault of buffer control and stablize with the risk of induced damage resistive network quality, improve stability and the extensibility of whole system.
The foregoing is only the schematic embodiment of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present invention and principle, amendment and combination, all should belong to the scope of protection of the invention.
Claims (14)
1. network information buffer memory (Web buffer memory) system for WLAN (wireless local area network) (WLAN), is characterized in that, comprising:
A cache controller and two or more AP;
Described AP, for receiving the request of described wireless local network user to internet information, obtaining the object of asking, and described object is sent to described user;
Described cache controller, for obtaining the request from described AP, and according to global buffer summary, the information of the object that acquisition is asked or the position about asked object, and send it to described AP;
Wherein, described global buffer summary, for preserving the buffer memory summary of all described AP in local area network (LAN).
2. system according to claim 1, is characterized in that, described AP is also for upgrading the buffer memory summary of own cache, and by cache controller described in described update notification, and to carry out summary synchronous with described cache controller;
Described cache controller, also for upgrading described global buffer summary according to the notice of described AP, and to carry out summary synchronous with described AP.
3. system according to any one of claim 1 to 2, is characterized in that, described cache controller disposes addressable position, IP address in a wlan, is opaque for described AP.
4. system according to any one of claim 1 to 2, is characterized in that, described cache controller is deployed in the gateway of WLAN with the form of the Transparent proxy server of AP.
5. for a method for system described in claim 3, it is characterized in that, described method comprises:
Step 102, AP receives user to the request of internet information;
Step 104, when asked object is not in the buffer memory of described AP, described request is transmitted to described cache controller by described AP;
Step 106, the information of the position about described object place is sent to described AP according to global buffer summary and the request from described AP by described cache controller;
Step 108, described AP is object according to the acquisition of information of the described position about described object place received;
Step 110, described object is sent to described user by described AP.
6. method according to claim 5, is characterized in that, described step 106 comprises further:
When there is the positional information of described object in described global buffer summary, the positional information of object described in described global buffer summary is sent to described AP by described cache controller;
Described step 108 comprises further:
Described AP, according to the described positional information from described cache controller, obtains described object from other AP preserving described object.
7. method according to claim 5, is characterized in that, described step 106 comprises further:
When there is not the positional information of described object in described global buffer summary, the positional information of described object in the Internet is sent to described AP by described cache controller;
Described step 108 comprises further:
Described AP, according to the described positional information about described object place from described cache controller, obtains described object from the assigned address the Internet.
8. method according to claim 7, it is characterized in that, described step 108 comprises further:
Described AP is by the buffer memory of the copy of described object stored in described AP; Or
Described AP is by the buffer memory of the copy of described object stored in described AP, and by cache controller described in the update notification of described buffer memory, described cache controller upgrades described global buffer summary according to described notice.
9. the method according to any one of claim 5 to 8, is characterized in that, described method also comprises:
When described AP eliminates the certain content in its buffer memory, described cache controller upgrades accordingly to described global buffer summary; And/or
When network is idle, it is synchronous that described cache controller and described AP carry out summary.
10. for a method for system described in claim 4, it is characterized in that, described method comprises:
Step 202, AP receives user to the request of internet information;
Step 204, when asked object is not in the buffer memory of described AP, described AP sends new request to the Internet assigned address that described request is pointed to;
Step 206, described cache controller intercepts and captures the described new request from described AP, and obtains described object according to global buffer summary;
Step 208, described object is sent to described AP by described cache controller.
Step 210, the described object obtained is sent to described user by described AP.
11. methods according to claim 10, is characterized in that, described step 206 comprises further:
When there is the positional information of described object in described global buffer summary, described cache controller obtains described object according to the positional information of object described in described global buffer summary from other AP preserving described object.
12. methods according to claim 10, is characterized in that, described step 206 comprises further:
When there is not the positional information of described object in described global buffer summary, the Internet assigned address that described cache controller points to from described new request obtains described object.
13. methods according to claim 12, is characterized in that, described step 208 comprises further:
Described AP is by the buffer memory of the copy of described object stored in described AP; Or
Described AP is by the buffer memory of the copy of described object stored in described AP, and by cache controller described in the update notification of described buffer memory, described cache controller upgrades described global buffer summary according to described notice.
14., according to claim 10 to the method according to any one of 13, is characterized in that, described method also comprises:
When described AP eliminates the certain content in its buffer memory, described cache controller upgrades accordingly to described global buffer summary; And/or
When network is idle, it is synchronous that described cache controller and described AP carry out summary.
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| CN106612304A (en) * | 2015-10-23 | 2017-05-03 | 中兴通讯股份有限公司 | Data access method and device |
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| CN104618450B (en) | 2018-05-22 |
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