CN102902630A - Method and device for accessing local file - Google Patents
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- CN102902630A CN102902630A CN2012103017448A CN201210301744A CN102902630A CN 102902630 A CN102902630 A CN 102902630A CN 2012103017448 A CN2012103017448 A CN 2012103017448A CN 201210301744 A CN201210301744 A CN 201210301744A CN 102902630 A CN102902630 A CN 102902630A
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Abstract
The embodiment of the invention discloses a method for accessing a local file. The method comprises the steps of: obtaining a request for accessing the local file; judging whether the local file has a corresponding cache file in a cache region according to the obtained access request, if not, reading the local file according to the access request, if yes, judging whether the cache file is updated, if the cache file is updated, reading the cache file according to the access request; and if the cache file is not updated, reading the local file according to the access request. The invention also discloses a device for accessing the local file. By adopting the invention, the local file can be read efficiently and in real time.
Description
Technical field
The present invention relates to a kind of field of computer technology, relate in particular to a kind of method and apparatus of accessing local file.
Background technology
Existing computer system can be accelerated by caching mechanism the speed of secondary access usually in access local file process, when the access local file, in buffer area, carry out buffer memory, if during the same local file of back-call, then directly use the data in the buffer memory, do not reload file and do not spend, accelerate browser access speed.The defective of existing caching mechanism is:
Memory cache can't be guaranteed real-time update, as when browser access during the pictures in local disk, this picture has been carried out memory cache, we have upgraded the image content modification on local disk afterwards, when at this moment browser visits again this picture for the second time, browser will directly use data cached, and can't show the image content of latest update; Perhaps set and does not unifiedly adopt memory cache, during the same picture of browser back-call, directly again read this picture from local disk, download, the action such as decoding, this can directly cause browser performance to descend.
Summary of the invention
Technical matters to be solved by this invention is, a kind of method and apparatus of accessing local file is provided, and can realize simultaneously high efficiency and the real-time of read local file.
In order to solve the problems of the technologies described above, the embodiment of the invention provides a kind of method of accessing local file, and described method comprises:
Obtain the request of access to local file;
Judge that according to the described request of access that gets access to whether described local file has corresponding cache file in buffer area, then read described local file according to described request of access if the determination result is NO;
If judge described local file corresponding cache file is arranged in buffer area, judge then whether described local file has renewal with respect to described cache file, do not have renewal then to read described cache file according to described request of access if judge described local file with respect to described cache file;
With respect to described cache file renewal is arranged if judge described local file, then read described local file according to described request of access.
Correspondingly, the embodiment of the invention also provides a kind of device of realizing accessing local file, and described device comprises:
The request of access acquisition module is used for obtaining the request of access to local file;
The buffer memory judge module is used for judging according to the described request of access that described request of access acquisition module gets access to whether described local file has corresponding cache file at buffer area;
The file update judge module is used for judging whether described local file has renewal with respect to described cache file when described buffer memory judge module obtains sure judged result;
The cache file read module is used for reading described cache file according to described request of access when described file update judge module judges that described local file does not upgrade with respect to described cache file;
The local file read module is used for when judged result that described buffer memory judge module obtains negating or described file update judge module when obtaining sure judged result, reads described local file according to described request of access.
Implement the present invention, have following beneficial effect: by at first confirming and the described cache file of real-time update when the cache file of read local file, thereby realized simultaneously high efficiency and the real-time of read local file.
Description of drawings
In order to be illustrated more clearly in the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is device the first example structure synoptic diagram that the present invention is used to realize accessing local file;
Fig. 2 is the structural representation of the file update judge module of the device that is used for realization access local file in the first embodiment of the invention;
Fig. 3 is the first embodiment schematic flow sheet of the present invention's method of accessing local file;
Fig. 4 is the cache management schematic flow sheet behind the read local file in the first embodiment of the invention;
Fig. 5 judges in the first embodiment of the invention whether described local file has the idiographic flow synoptic diagram of renewal with respect to described cache file.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Fig. 1 is device the first example structure synoptic diagram that the present invention is used to realize accessing local file.The present invention realizes that the device of accessing local file can be implemented in as in the systems such as computer, digital TV terminal, portable terminal, can conduct interviews to the data in the storage medium such as text, picture file or Digital Television wheel multicast data etc. by browser in the system, and the caching mechanism that in internal memory, proposes among realization the present invention.Be used in the present embodiment as shown in the figure realizing that the device of access local file can comprise at least: request of access acquisition module 10, buffer memory judge module 20, file update judge module 30, cache file read module 40 and local file read module 50, wherein:
Request of access acquisition module 10 is used for obtaining the request of access to local file.Concrete, request of access acquisition module 10 can obtain the user to the request of access of the local file in the device storage medium by browser, local file in the storage medium can be text, picture file or Digital Television wheel multicast data etc., described request of access can comprise the file path of the local file of the protocol header of default form and request, for example: file: D KAWD331 1.JPG, dvb: 0631.MP4 etc.
Buffer memory judge module 20 is used for judging according to the described request of access that described request of access acquisition module 10 gets access to whether described local file has corresponding cache file at buffer area.Concrete, local file is to carry out related by file path with cache file in the buffer area in the present embodiment, buffer memory judge module 20 can be searched the cache file that is associated according to the file path of the requested local file in the request of access that gets access in buffer area, described buffer area can be for installing built-in memory cache district, the browser rs cache district that also can in storage medium, set up for browser, if search less than showing that then this is that browser is accessed this local file for the first time, it is not carried out buffer memory, buffer memory judge module 20 can trigger local file read module 50 and read requested local file according to described request of access before.
File update judge module 30 is used for judging whether described local file has renewal with respect to described cache file when described buffer memory judge module 20 obtains sure judged result.Concrete, when obtaining sure judged result, buffer memory judge module 20 shows that requested local file has corresponding cache file in buffer area, file update judge module 30 further judges whether described local file has renewal with respect to described cache file, if renewal does not then trigger cache file read module 40 and reads described cache file according to described request of access, if having renewal then to trigger local file read module 50 with respect to cache file, local file reads requested local file according to described request of access.Present embodiment File renewal judge module 30 may further include as shown in Figure 2:
Modification time acquiring unit 301 is for the last modification time and last modification time corresponding to described cache file that obtain respectively described local file according to described request of access.Concrete, described cache file and file path and local file final updating time of last update before buffer memory of local file can be carried out corresponding related preservation when preserving described cache file in buffer area, the final updating time of described local file last update before buffer memory is namely as last modification time corresponding to described cache file.Modification time can go to respectively local file obtains described local file in local storage medium last modification time in unit 301 in the past, and obtains last modification time corresponding to described cache file in buffer area.
Upgrade judging unit 302, be used for judging according to last modification time and the last modification time corresponding to described cache file of described local file whether described local file has renewal with respect to described cache file, if the last modification time that the last modification time of described local file and described cache file are corresponding is identical, judge that then described local file does not upgrade with respect to described cache file, otherwise judge that described local file has renewal with respect to described cache file.Can adopt in other embodiments other judgment mode to judge whether described local file has renewal with respect to described cache file, the cache file that for example also can immediately trigger in the buffer area when local file is made amendment upgrades, if finished then mark update mode of buffer update, do not upgrade then not update mode of mark if finish, whether file update judge module 30 can have renewal with respect to described cache file according to the described local file of this marker for judgment.
Optionally, the concrete triggering mode of file update judge module 30 can for: file update judge module 30 produces first code when judging that described local file does not upgrade with respect to described cache file, described first code is sent to described cache file read module 40 triggers described cache file read module 40 and read cache file according to described request of access; When judging that described local file has when renewal to produce second code with respect to described cache file, described second code is sent to described local file read module 50 triggers described local file read module 50 according to described request of access read local file.Described first code can be default code error code 304 for example, and described second code can be other error codes of non-304.
Cache file read module 40 is used for reading described cache file according to described request of access when described file update judge module judges that described local file does not upgrade with respect to described cache file.Concrete, cache file read module 40 finds corresponding cache file according to the file path in the described request of access in buffer area, browser and then can be with this cache file response user's of reading access, and then the operation such as resolve, set type, play up at browser.
Local file read module 50 is used for when the judged result that described buffer memory judge module obtains negating or described file update judge module when obtaining sure judged result, reads described local file according to described request of access.Concrete, local file read module 50 can read described requested local file according to the file path in the described request of access in local storage medium, browser and then can be with the local file that reads response user's access, and then the operation such as resolve, set type, play up at browser.And then local file read module 50 can obtain the last modification time of described local file when reading described local file.
Further, being used in the present embodiment realizes that the device of access local file can also comprise:
Fig. 3 is the first embodiment schematic flow sheet of the present invention's method of accessing local file.The method that the present invention accesses local file can be implemented in as in the computer systems such as computer, digital TV terminal, portable terminal, can conduct interviews to the data in the storage medium such as text, picture file or Digital Television wheel multicast data etc. by browser in the system, and the caching mechanism that in Installed System Memory, proposes among realization the present invention.Method flow in the present embodiment comprises at least as shown in the figure:
S301 obtains the request of access to local file.In the specific implementation, can obtain the user to the request of access of the local file in the device storage medium by browser, local file in the storage medium can be text, picture file or Digital Television wheel multicast data etc., described request of access can comprise the file path of the local file of the protocol header of default form and request, for example: file: D KAWD331 1.JPG, dvb: 0631.MP4 etc.
S302 judges according to the described request of access that gets access to whether described local file has corresponding cache file in buffer area.In the specific implementation, local file is to carry out related by file path with cache file in the buffer area in the present embodiment, browser can be searched the cache file that is associated according to the file path of the requested local file in the request of access that gets access in buffer area, described buffer area can be for installing built-in memory cache district, the browser rs cache district that also can in storage medium, set up for browser, then trigger execution S303 if found corresponding cache file, if search less than showing that then this is that browser is accessed this local file for the first time, it is not carried out buffer memory before, then can trigger and carry out S305.
S303 judges whether described local file has renewal with respect to described cache file.In the specific implementation, when obtaining sure judged result, S302 shows that requested local file has corresponding cache file in buffer area, whether further judge described local file has renewal with respect to the described cache file that finds to S303, do not carry out S304 if upgrade then to trigger, carry out S305 if there is renewal then to trigger.Optionally, according to the judged result of S303 trigger the concrete triggering mode of read local file or cache file can for: produce first code when judging that described local file does not upgrade with respect to described cache file, browser triggers according to described first code and reads cache file according to described request of access; When judging that described local file has when renewal to produce second code with respect to described cache file, browser triggers according to described request of access read local file according to described second code.Described first code can be default code error code 304 for example, and described second code can be other error codes of non-304.
S304 reads described cache file according to described request of access.In the specific implementation, when judging that requested local file does not upgrade with respect to the cache file in buffer area, then can read this corresponding cache file, browser and then can be with this cache file response user's of reading access, and then the operation such as resolve, set type, play up at browser.
S305 reads described local file according to described request of access.In the specific implementation, judge that in S303 obtaining requested local file does not have corresponding cache file at buffer area, or judge that in S304 described local file has renewal with respect to described cache file, then can in local storage medium, read described requested local file according to the file path in the described request of access, browser and then can be with the local file that reads response user's access, and then the operation such as resolve, set type, play up at browser.
Fig. 4 is the cache management schematic flow sheet behind the read local file in the first embodiment of the invention.Concrete, after S304 reads described local file according to described request of access, can also comprise the cache management flow process to local file, it is to be noted, in other embodiments, the below can be not limited only to occur in according to after the request of access read local file to the cache management flow process of local file, also can trigger cache management flow process to this local file to the retouching operation of local file according to the user.Cache management flow process in the present embodiment comprises as shown in the figure:
S401 obtains the content of described local file;
S402 obtains the last modification time of described local file;
S403 is buffered in the content of described local file and the last modification time of described local file in the buffer area, as cache file and the last modification time corresponding to described cache file of described local file.Can be with the content of described local file and be kept in buffer area related with the file path of described local file of last modification time of described local file in the present embodiment, respectively as cache file and the last modification time corresponding to described cache file of described local file.
Fig. 5 judges in the first embodiment of the invention whether described local file has the idiographic flow synoptic diagram of renewal with respect to described cache file.S303 in the present embodiment further can comprise as shown in Figure 5:
S501 obtains respectively last modification time and the last modification time corresponding to described cache file of described local file according to described request of access.Concrete, described cache file and file path and local file final updating time of last update before buffer memory of local file can be carried out corresponding related preservation when preserving described cache file in buffer area, the final updating time of described local file last update before buffer memory is namely as last modification time corresponding to described cache file.Browser can go to respectively local file obtains described local file in local storage medium last modification time, and obtains last modification time corresponding to described cache file in buffer area.
S502, last modification time and last modification time corresponding to described cache file according to described local file judge whether described local file has renewal with respect to described cache file, if the last modification time that the last modification time of described local file and described cache file are corresponding is identical, then carry out S503 and judge that described local file does not upgrade with respect to described cache file, judge that described local file has renewal with respect to described cache file otherwise carry out S504.Can adopt in other embodiments other judgment mode to judge whether described local file has renewal with respect to described cache file, the cache file that for example triggers in the buffer area when local file is made amendment upgrades, upgrade then update mode of mark if finished, do not upgrade then not update mode of mark if finish, whether follow-up can have renewal with respect to described cache file according to the described local file of this marker for judgment when the same local file of access.
The embodiment of the invention is by at first confirming when the cache file of read local file and the described cache file of real-time update, thereby realized simultaneously high efficiency and the real-time of read local file.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in above-described embodiment method, to finish by the relevant hardware of computer program instructions, described program can be stored in the computer read/write memory medium, this program can comprise the flow process such as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or store-memory body (Random Access Memory, RAM) etc. at random.
Above disclosed is preferred embodiment of the present invention only, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (10)
1. a method of accessing local file is characterized in that, described method comprises:
Obtain the request of access to local file;
Judge that according to the described request of access that gets access to whether described local file has corresponding cache file in buffer area, then read described local file according to described request of access if the determination result is NO;
If judge described local file corresponding cache file is arranged in buffer area, judge then whether described local file has renewal with respect to described cache file, do not have renewal then to read described cache file according to described request of access if judge described local file with respect to described cache file;
With respect to described cache file renewal is arranged if judge described local file, then read described local file according to described request of access.
2. the method for access local file as claimed in claim 1 is characterized in that, describedly also comprises after reading described local file according to described request of access:
Obtain the content of described local file;
Obtain the last modification time of described local file;
The content of described local file and the last modification time of described local file are buffered in the buffer area, respectively as cache file and the last modification time corresponding to described cache file of described local file.
3. the method for access local file as claimed in claim 2 is characterized in that, describedly judges whether described local file has to upgrade with respect to described cache file and comprises:
Obtain respectively last modification time and the last modification time corresponding to described cache file of described local file according to described request of access;
If the last modification time that the last modification time of described local file and described cache file are corresponding is identical, judges that then described local file has renewal with respect to described cache file, otherwise judge that described local file does not upgrade with respect to described cache file.
4. such as the method for each described access local file in the claim 1 ~ 3, it is characterized in that described request of access to local file comprises the file path of described local file;
Described the content of described local file and the last modification time of described local file are buffered in the buffer area, the last modification time corresponding as cache file and the described cache file of described local file comprises: the last modification time that described cache file and described cache file is corresponding carries out related preservation with described file path;
The described request of access that described basis gets access to judges whether described local file has corresponding cache file to be in buffer area: judge whether the cache file that is associated with file path in the described request of access is arranged in buffer area.
5. such as the method for each described access local file in the claim 1 ~ 3, it is characterized in that, describedly judge whether described local file has with respect to described cache file and also comprise after upgrading:
When judging that described local file does not upgrade with respect to described cache file, produce first code, trigger according to described first code and read cache file according to described request of access;
When judging that described local file has when renewal to produce second code with respect to described cache file, triggers according to described request of access read local file according to described second code.
6. a device of realizing accessing local file is characterized in that, described device comprises:
The request of access acquisition module is used for obtaining the request of access to local file;
The buffer memory judge module is used for judging according to the described request of access that described request of access acquisition module gets access to whether described local file has corresponding cache file at buffer area;
The file update judge module is used for judging whether described local file has renewal with respect to described cache file when described buffer memory judge module obtains sure judged result;
The cache file read module is used for reading described cache file according to described request of access when described file update judge module judges that described local file does not upgrade with respect to described cache file;
The local file read module is used for when judged result that described buffer memory judge module obtains negating or described file update judge module when obtaining sure judged result, reads described local file according to described request of access.
7. the device of local file is accessed in realization as claimed in claim 6, it is characterized in that described device also comprises:
Cache module is used for the content of described local file and the last modification time of described local file are buffered in buffer area, respectively as cache file and the last modification time corresponding to described cache file of described local file.
8. the device of local file is accessed in realization as claimed in claim 7, it is characterized in that described file update judge module comprises:
The modification time acquiring unit is for the last modification time and last modification time corresponding to described cache file that obtain respectively described local file according to described request of access;
Upgrade judging unit, be used for judging whether update mode of described cache file according to last modification time and the last modification time corresponding to described cache file of described local file, if the last modification time that the last modification time of described local file and described cache file are corresponding is identical, judge that then described local file does not upgrade with respect to described cache file, otherwise judge that described local file has renewal with respect to described cache file.
9. such as the device of each described realization access local file in the claim 6 ~ 8, it is characterized in that the described request of access to local file that described request of access acquisition module gets access to comprises the file path of described local file;
Described cache module is buffered in described local file and last modification time thereof in the buffer area, and the last modification time corresponding as cache file and the described cache file of described local file comprises: the last modification time that cache module is corresponding with described cache file and described cache file carries out related preservation with described file path;
Described buffer memory judge module judges according to the described request of access that gets access to whether described local file has corresponding cache file to be in buffer area: judge whether the cache file that is associated with file path in the described request of access is arranged in buffer area.
10. access the device of local file such as each described realization in the claim 6 ~ 8, it is characterized in that, described file update judge module also is used for generation first code when judging that described local file does not upgrade with respect to described cache file, described first code is sent to described cache file read module triggers described cache file read module and read cache file according to described request of access; When judging that described local file has when renewal to produce second code with respect to described cache file, is sent to described local file read module with described second code and triggers described local file read module according to described request of access read local file.
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| CN102902630B (en) | 2016-12-21 |
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