CN103179219B - A kind of content addressed method and system - Google Patents
A kind of content addressed method and system Download PDFInfo
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- CN103179219B CN103179219B CN201110428557.1A CN201110428557A CN103179219B CN 103179219 B CN103179219 B CN 103179219B CN 201110428557 A CN201110428557 A CN 201110428557A CN 103179219 B CN103179219 B CN 103179219B
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Abstract
The invention discloses a kind of content addressed method and system.Arranging the IP address that value is content, key is the URL (URL) that described content is corresponding, is mapped by key and value, generates the mapping relations between key and value；The method includes: when comprising key in user's inquiry request, searches corresponding mapping relations according to described key, according to searching the value the obtained IP address obtaining the content of correspondence；When user's inquiry request comprises value, search corresponding mapping relations according to described value, according to searching the key the obtained URL obtaining the content of correspondence.The present invention can for the content addressed demand of different system difference naming method, request for the inquiry content of user can obtain multiple storage position, thus improving the efficiency of transmission of content obtaining, for adopting the system of content flattening name, can when the address aging of content, user remains able to obtain this content smoothly, improves the susceptibility of user.
Description
Technical field
The present invention relates to a kind of addressing technique, particularly relate to a kind of content addressed method and system.
Background technology
Content in all kinds of address (ADDR systems, is the definition according to system and demand is described with some form and stores, and therefore, the addressing of content is according in this system, the description form of content to be carried out.
At present in different systems, content is described in different forms, and this makes the content of each system be difficult to be shared by other system.
In existing network, as it is shown in figure 1, content is mainly identified by URL (Uniform/UniversalResourceLocator is called for short URL) and is positioned.Content takes structurized naming method, and content addressed needs carries out step by step.
As in figure 2 it is shown, when user wishes to obtain a certain content, request can be sent to the server in system, then, URL can be carried out resolving step by step and gradually redirecting according to the URL of content by DNS, until obtaining result.
As it is shown on figure 3, and for some system, for instance P2P system, content have employed the naming method of flattening, and the addressing of content will not be used DNS and redirects, but by content carries out hash, obtains ContentID.
As shown in Figure 4, time content addressed, user is by searching content location in ContentID to index node in system (chain).
The unified addressing of the content that existing technology cannot be named structuring name and flattening connects, and therefore cannot solve following two problem
(1), when user is by URL request content, a URL of this content can only be obtained, it is impossible to find the address of more identical content, to improve efficiency of transmission；
(2) when the address aging of user's request content in P2P system, how to allow users to obtain this content smoothly by inquiring the URL of this content.
Summary of the invention
It is an object of the invention to, it is provided that a kind of content addressed method and system, improve the efficiency of transmission of content, user can obtain content smoothly, improves the susceptibility of user.
For achieving the above object, according to an aspect of the present invention, it is provided that a kind of content addressed method, the IP address that value is content is set, key is the URL (URL) that described content is corresponding, is mapped by key and value, generates the mapping relations between key and value；The method includes:
When user's inquiry request comprises key, search corresponding mapping relations according to described key, according to searching the value the obtained IP address obtaining the content of correspondence；
When user's inquiry request comprises value, search corresponding mapping relations according to described value, according to searching the key the obtained URL obtaining the content of correspondence.
Wherein, described being mapped by key and value, the mapping relations generated between key and value include:
Content corresponding for described key and value is changed；
When two values obtained after conversion are equal, generate the mapping relations between key and value.
It addition, the method also includes:
Key in described mapping relations is changed；
Key and storage device ID after conversion is compared；
When the key after conversion is equal with storage device ID or closest to time, described mapping relations are stored in corresponding storage device.
The method also includes:
When described user's inquiry request comprises key, the key in user's inquiry request is changed, obtains conversion value；
Find corresponding storage device according to described conversion value, from described storage device, inquire about described key, it is thus achieved that the IP address of corresponding content.Described find corresponding storage device according to described conversion value and include:
Or immediate storage device equal with described conversion value from storage device ID, make a look up by storage device ID ascending order storage device one by one, until inquiring about described key from described storage device or searching unsuccessfully.
Value includes multiple IP addresses of content.
Storing in storage device by the mapping relations between key and value, the lookup record searching URL according to value stores in buffer storage, and the method also includes:
Lookup record when comprising value in described user's inquiry request, before searching whether in described buffer storage；
During lookup record before having in buffer storage, key corresponding for value according to described lookup record search, according to the URL searching the key obtained and obtaining corresponding content；
When there is no lookup record before, search storage device one by one according to value, until finding the URL of correspondence or searching unsuccessfully.
When described buffer storage does not have lookup record before, after finding the URL of correspondence, described buffer storage stores the lookup record of this content addressed correspondence.
More preferably, also include: buffer storage described in fixed time cleaning, including:
Record request number of times and the life span of each value；
Calculating cleaning value, namely value calls request the ratio of number of times and life span；
Delete the described cleaning value lookup record less than default threshold value.
For achieving the above object, according to an aspect of the present invention, it is provided that a kind of content addressed system, including:
Storage device, is used for storing content and the mapping relations between key and value, and wherein, value is the IP address of content, and key is the URL that described content is corresponding；
Search device, be used for when user's inquiry request comprises key, search corresponding mapping relations according to described key, according to searching the value the obtained IP address obtaining the content of correspondence；When user's inquiry request comprises value, search corresponding mapping relations according to described value, according to searching the key the obtained URL obtaining the content of correspondence.
This system also includes:
Conversion equipment, for changing content corresponding for described key and value；
Mapping device, for when two values obtained after conversion are equal, generating the mapping relations between key and value.
This system also includes: memory control device,
Described conversion equipment, for changing key；
Memory control device, for key and the storage device ID after conversion is compared, when the key after conversion is equal with storage device ID or closest to time, described mapping relations are stored in corresponding storage device.
Wherein, described conversion equipment, for the key in user's inquiry request is changed, obtain conversion value；Described lookup device, for finding corresponding storage device according to described conversion value, or immediate storage device equal with described conversion value from storage device ID, make a look up by storage device ID ascending order storage device one by one, until inquiring about described key from described storage device or searching unsuccessfully.
This system also includes:
Buffer storage, for storing the lookup record inquiring about URL according to described value；
Described lookup device, for inquiring about the URL of correspondence according to described value from described buffer storage；When described buffer storage does not record, search storage device one by one according to value, until finding the URL of correspondence or searching unsuccessfully.
Preferably, this system also includes:
Recording equipment, for recording request number of times and the life span of each value；
Calculation element, is used for calculating cleaning value, and namely value calls request the ratio of number of times and life span；
Described buffer storage, for deleting the described cleaning value lookup record less than default threshold value.
Present disclosure addressing method and system, by URL corresponding to the IP address of content and content is mapped, obtain mapping relations and store corresponding storage device, when user initiates inquiry request, make a look up according to URL or the IP address storage device one by one in user's inquiry request.The present invention can for the content addressed demand of different system difference naming method, request for the inquiry content of user can obtain multiple storage position, thus improving the efficiency of transmission of content obtaining, for adopting the system of content flattening name, when the address aging of content, user remains able to obtain this content smoothly, improves the susceptibility of user.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of prior art constructionization name；
Fig. 2 is the schematic diagram of prior art URL resolving；
Fig. 3 is the flattening name schematic diagram with distribution storage of prior art content；
Fig. 4 is the schematic diagram of the lookup of prior art flattening name content；
Fig. 5 is the flow chart of present invention addressing method embodiment；
Fig. 6 is the flow chart of present invention another embodiment of addressing method；
Fig. 7 is the structure chart of present invention addressing system embodiment；
Fig. 8 is another structure chart of present invention addressing system embodiment.
Detailed description of the invention
In the present invention, first one or more IP addresses that value is content will be set, key is the URL that described content is corresponding, being mapped by key and value, storage device is arrived in mapping relations (key, the value) storage generated between key and value, when user's inquiry request comprises key, corresponding mapping relations (key, value) are searched, according to searching the value the obtained IP address obtaining the content of correspondence according to described key；When user's inquiry request comprises value, search corresponding mapping relations (key, value) according to described value, according to searching the key the obtained URL obtaining the content of correspondence.
Key and value is carried out mapping include: content corresponding for described key and value changed；When two values obtained after conversion are equal, generate the mapping relations (key, value) between key and value.Further, the key in described mapping relations (key, value) is changed；Key and storage device ID after conversion is compared；When conversion after key equal with storage device ID or closest to time, by described mapping relations (key, value) storage to correspondence storage device in.
This conversion regime can be hash, it is also possible to for other modes.
Below in conjunction with accompanying drawing, the present invention is described in detail.
Embodiment of the method one
As it is shown in figure 5, user inquires about the storage position of content by URL, present invention addressing method embodiment includes:
Step 102, receives user's inquiry request, comprises key, i.e. the URL of content in this user's inquiry request；
Step 104, carries out hash, hash (key) to this key；
Step 106, equal from storage device ID and hash (key) or immediate storage device, search Key by storage device ID ascending order storage device one by one；
Step 108, it may be judged whether find equal key, if it is, perform step 110, if it does not, perform step 112；
Step 110, inquires about value according to key, obtains the IP address of the content of user's inquiry；
Step 112, it is judged that whether all storage devices were all searched, if it is, perform step 114, if it does not, return step 108；
Step 114, returns and searches unsuccessfully, and lookup terminates.
The key inquiry request sent to system due to user can send value inquiry request far more than user to system, i.e. the inquiry meeting of the key → value inquiry far more than value → key in system.Therefore, from being more quickly completed angle that is content addressed and that save memory space, the process of storage is preferentially to carry out according to the order of key, namely as much as possible by equal for (key, value) storage to storage device ID and hash (key) or immediate storage device.Therefore, in content addressed process, first the key in user's inquiry request is carried out hash, obtain hash (key)；Find corresponding storage device according to hash (key), then from storage device, inquire about key, it is thus achieved that the value that key is corresponding, i.e. the IP address of content.
Such as, in (key, value), hash (key)=x；Storage device ID respectively x-z=n+z, x-l=n, the m-x=y of three storage devices k, l, m, wherein x, k, n, z, l, y be not less than 0 integer, and n+z > n, then should (key, value) should be stored on storage device l.
The content addressed method of the present embodiment, by URL corresponding to the IP address of content and content is mapped, obtain mapping relations (key, value) corresponding storage device is arrived in storage, when user initiates inquiry request, make a look up according to the storage device one by one of the URL in user's inquiry request.Can for the content addressed demand of different system difference naming method, request for the inquiry content of user can obtain multiple storage position, thus improving the efficiency of transmission of content obtaining, for adopting the system of content flattening name, when the address aging of content, user remains able to obtain this content smoothly, improves the susceptibility of user.
It addition, by, after being changed by the key in user's inquiry request, finding storage (key according to conversion value, value) storage device, this storage device is searched value corresponding to key, it is possible to be more quickly completed content addressed, improve the susceptibility of user.
Embodiment of the method two
As shown in Figure 6, user is by the URL of the IP address lookup content of content, and present invention addressing method embodiment includes:
Step 202, receives user's inquiry request, comprises value in this user's inquiry request；
Step 204, according to the lookup record before searching in value to buffer storage；
Step 206, the lookup record before whether having in buffer storage, if it has, perform step 210, if it did not, perform step 212；；
Step 208, obtains key according to value, obtains the storage address of the content of user's inquiry；
Step 210, value searched by storage device one by one；
Step 212, it may be judged whether find equal value, if it is, perform step 216, if it does not, perform step 220；
Step 214, obtains key according to value, obtains the storage address of the content of user's inquiry；
Step 216, stores in buffer storage by this lookup record, the convenient inquiry next time carrying out same request；
Step 218, it is judged that whether all storage devices were all searched, if it is, perform step 222, if it does not, return step 214；
Step 220, returns and searches unsuccessfully, and lookup terminates.
Relatively slow owing to searching value by storage device, first search from buffer memory, if the record before having in buffer memory, it is possible to would quickly obtain the URL of content.
Further, since when storing (key, value), also store multiple IP address informations corresponding to each value simultaneously, accordingly it is also possible to other IP addresses corresponding by inquiring about value, find content rapidly, further increase lookup speed.
Owing to the size of buffer storage is limited, it is necessary to the data in fixed time cleaning buffer storage, concrete operations are as follows:
(1) request number of times and the life span of each value are recorded；
(2) calculating cleaning value, namely value calls request the ratio of number of times and life span, and cleaning value is more high means that in the unit interval, the request of certain content is more frequent
(3) delete the described cleaning value lookup record less than default threshold value, and in buffer storage, only store current request content more frequently.
The content addressed method of the present embodiment, by URL corresponding to the IP address of content and content is mapped, obtain (key, value) corresponding storage device is arrived in storage, when user initiates inquiry request, make a look up according to the content IP address storage device one by one in user's inquiry request.Can for the content addressed demand of different system difference naming method, request for the inquiry content of user can obtain multiple storage position, thus improving the efficiency of transmission of content obtaining, for adopting the system of content flattening name, when the address aging of content, user remains able to obtain this content smoothly, improves the susceptibility of user.
Based on same inventive concept, the embodiment of the present invention additionally provides user and addresses dress system, as it is shown in fig. 7, comprises:
Storage device 31, is used for storing content and the mapping relations between key and value, and wherein, value is the IP address of content, and key is the URL that described content is corresponding；
Search device 32, be used for when user's inquiry request comprises key, search corresponding mapping relations according to described key, according to searching the value the obtained IP address obtaining the content of correspondence；When user's inquiry request comprises value, search corresponding mapping relations according to described value, according to searching the key the obtained URL obtaining the content of correspondence..
Preferably, this system also includes:
Conversion equipment 33, for changing content corresponding for described key and value；
Mapping device 34, for when two values obtained after conversion are equal, generating the mapping relations between key and value..
It addition, this also includes: memory control device 35,
Conversion equipment 33, for changing key；
Memory control device 35, for key and the storage device ID after conversion is compared, when the key after conversion is equal with storage device ID or closest to time, described mapping relations are stored in corresponding storage device.
Wherein, conversion equipment 33, for the key in user's inquiry request is changed, obtain conversion value；Search device 32, for finding corresponding storage device according to described conversion value, or immediate storage device equal with described conversion value from storage device ID, make a look up by storage device ID ascending order storage device one by one, until inquiring about described key from described storage device or searching unsuccessfully.
Preferably, this system also includes: buffer storage 36, for storing the lookup record inquiring about URL according to described value；Search device 32, for inquiring about the URL of correspondence from described buffer storage according to described value；When described buffer storage does not have record, then search storage device one by one according to value, until finding the URL of correspondence or searching unsuccessfully.Relatively slow owing to searching value by storage device, first search from buffer memory, if the record before having in buffer memory, it is possible to would quickly obtain the storage address of content.
More preferably, owing to the size of buffer storage is limited, it is necessary to the data in fixed time cleaning buffer storage, this system also includes:
Recording equipment 37, for recording request number of times and the life span of each value；
Calculation element 38, is used for calculating cleaning value, and namely value calls request the ratio of number of times and life span；
Buffer storage 36, for deleting the described cleaning value lookup record less than default threshold value.
The content addressed system of the present embodiment, by URL corresponding to the IP address of content and content is mapped, obtain (key, value) corresponding storage device is arrived in storage, when user initiates inquiry request, make a look up according to the URL in user's inquiry request or content IP address storage device one by one.The present invention can for the content addressed demand of different system difference naming method, request for the inquiry content of user can obtain multiple storage position, thus improving the efficiency of transmission of content obtaining, for adopting the system of content flattening name, when the address aging of content, user remains able to obtain this content smoothly, improves the susceptibility of user
Specifically, in the present embodiment, conversion equipment, mapping device and memory control device may be located in the mapping server of network side, search in the client server that device, buffer storage recording equipment and calculation element may be located at network side.
As shown in Figure 8, in adopting the DSN system redirected, it is possible to newly-increased server and dns server are set together, in P2P system, then newly-increased server can be set together with Tracker.The mode being set together both can be form server zone, it is also possible to newly-increased server is integrated with dns server/Tracker physically.Storage device is distributed across in system, it is possible to be user terminal, it is possible to be server.
It is noted that above example is only in order to illustrate rather than restriction, the present invention is also not limited to the example above, and all are without departing from the technical scheme of the spirit and scope of the present invention and improvement thereof, and it all should be encompassed in scope of the presently claimed invention.
Claims (11)
1. a content addressed method, it is characterised in that arrange the IP address that value is content, key is the URL (URL) that described content is corresponding, is mapped by key and value, generates the mapping relations between key and value；The method includes:
When user's inquiry request comprises key, search corresponding mapping relations according to described key, according to searching the value the obtained IP address obtaining the content of correspondence；
When user's inquiry request comprises value, search corresponding mapping relations according to described value, according to searching the key the obtained URL obtaining the content of correspondence；
Described being mapped by key and value, the mapping relations generated between key and value include:
Content corresponding for described key and value is changed；
When two values obtained after conversion are equal, generate the mapping relations between key and value；
Also include:
Key in described mapping relations is changed；
Key and storage device ID after conversion is compared；
When the key after conversion is equal with storage device ID or closest to time, described mapping relations are stored in corresponding storage device.
2. content addressed method according to claim 1, it is characterised in that the method also includes:
When described user's inquiry request comprises key, the key in user's inquiry request is changed, obtains conversion value；
Find corresponding storage device according to described conversion value, from described storage device, inquire about described key, it is thus achieved that the IP address of corresponding content.
3. content addressed method according to claim 2, it is characterised in that described find corresponding storage device according to described conversion value and include:
Or immediate storage device equal with described conversion value from storage device ID, make a look up by storage device ID ascending order storage device one by one, until inquiring about described key from described storage device or searching unsuccessfully.
4. content addressed method according to claim 1, it is characterised in that described value includes multiple IP addresses of content.
5. content addressed method according to claim 1, it is characterised in that the mapping relations between key and value are stored in storage device, the lookup record searching URL according to value stores in buffer storage, and the method also includes:
Lookup record when comprising value in described user's inquiry request, before searching whether in described buffer storage；
During lookup record before having in buffer storage, key corresponding for value according to described lookup record search, according to the URL searching the key obtained and obtaining corresponding content；
When there is no lookup record before, search storage device one by one according to value, until finding the URL of correspondence or searching unsuccessfully.
6. content addressed method according to claim 5, it is characterised in that when not having lookup record before in described buffer storage, after finding the URL of correspondence, stores the lookup record of this content addressed correspondence in described buffer storage.
7. content addressed method according to claim 6, it is characterised in that also include: buffer storage described in fixed time cleaning, including:
Record request number of times and the life span of each value；
Calculating cleaning value, namely value calls request the ratio of number of times and life span；
Delete the described cleaning value lookup record less than default threshold value.
8. user's addressing system, it is characterised in that including:
Storage device, is used for storing content and the mapping relations between key and value, and wherein, value is the IP address of content, and key is the URL that described content is corresponding；
Search device, be used for when user's inquiry request comprises key, search corresponding mapping relations according to described key, according to searching the value the obtained IP address obtaining the content of correspondence；When user's inquiry request comprises value, search corresponding mapping relations according to described value, according to searching the key the obtained URL obtaining the content of correspondence；
Also include:
Conversion equipment, for changing content corresponding for described key and value；
Mapping device, for when two values obtained after conversion are equal, generating the mapping relations between key and value；
Also include: memory control device,
Described conversion equipment, for changing key；
Memory control device, for key and the storage device ID after conversion is compared, when the key after conversion is equal with storage device ID or closest to time, described mapping relations are stored in corresponding storage device.
9. user's addressing system according to claim 8, it is characterised in that
Described conversion equipment, for the key in user's inquiry request is changed, obtains conversion value；
Described lookup device, for finding corresponding storage device according to described conversion value, or immediate storage device equal with described conversion value from storage device ID, make a look up by storage device ID ascending order storage device one by one, until inquiring about described key from described storage device or searching unsuccessfully.
10. user's addressing system according to claim 8, it is characterised in that also include:
Buffer storage, for storing the lookup record inquiring about URL according to described value；
Described lookup device, for inquiring about the URL of correspondence according to described value from described buffer storage；When described buffer storage does not record, search storage device one by one according to value, until finding the URL of correspondence or searching unsuccessfully.
11. user's addressing system according to claim 10, it is characterised in that also include:
Recording equipment, for recording request number of times and the life span of each value；
Calculation element, is used for calculating cleaning value, and namely value calls request the ratio of number of times and life span；
Described buffer storage, for deleting the described cleaning value lookup record less than default threshold value.
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| CN106685829B (en) * | 2016-12-27 | 2020-06-19 | 京信通信系统（中国）有限公司 | Method and device for transmitting real-time transport protocol RTP user plane data |
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