CN101169790A - Matrix type data caching method and device based on WEB application - Google Patents
Matrix type data caching method and device based on WEB application Download PDFInfo
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Abstract
The invention discloses a matrix form data caching method based on WEB application and a device thereof. The method comprises equipping a caching server for caching the read date from a database server according to a request from a portal server; performing object/relation mapping to the cached date to obtain persistent data; building indexes for the persistent data using Hash table to form a matrix form data structure; and providing access interface by the caching server according to the indexes. The invention obtains high efficiency with low cost, reduces the mutual communization of the WEB application server and database server, and reduces I/O read-write times of disk. The data is persistent. The invention enriches data searching manner, and provides very flexible interface and method for sequencing, accounting and other functions using these indexes.
Description
Technical field
The present invention relates to the buffer memory of database data, particularly relate to a kind of matrix type data caching method and device of using based on WEB.
Background technology
The WEB application program is the main body of whole network for the user provides information and service.WEB application's data response promptness and extensibility are to estimate two key indexs of its performance quality.Promptness is meant the speed of WEB server end customer in response end; Extensibility is meant that the performance of WEB application program does not reduce along with the increasing of concurrent use user.
For the WEB server, along with increasing of concurrent user, the number of times and the data volume of WEB server access database server will increase thereupon.But in Database Systems, the I/O speed of disk is the key of restriction system processing speed.Will occur like this surpassing some as the concurrent user, the request of reading disk increases, and the data volume that reads is big, then be limited to the present I/O speed of disk, the application responds of WEB server is untimely, and application performance reduces, even the phenomenon that can not be connected with database.
So, keep one to determine how to improve data access speed under the prerequisite of numerical value relatively in the I/O of disk speed, guarantee that the extensibility of WEB program all is a problem demanding prompt solution.
Summary of the invention
The invention provides a kind of matrix type data caching method and device of using based on WEB, to solve direct accessing database often, data structure is unreasonable, the problem of WEB application performance difference.
To achieve these goals, the invention provides a kind of matrix type data caching method of using based on WEB, be used to comprise the WEB application system of portal server and database server, comprising:
Step 1 is provided with a caching server, and the request according to described portal server is carried out buffer memory from the data that database server reads;
Step 2 to the described data cached object/relationship map of carrying out, obtains perdurable data;
Step 3, utilizing Hash table is that described perdurable data is set up index, forms the matrix form data structure;
Step 4, described caching server provides data access interface according to described index.
Described step 1 further comprises: described caching server is provided with a frequency threshold and a capacity threshold, reading frequency and data volume to the data that read from database server are monitored, be higher than described frequency threshold for reading frequency, data volume is lower than the data of described capacity threshold and carries out buffer memory.
Described step 2 further comprises: described object/relationship map utilizes hibernate framework or ibatis framework to realize.
Described step 3 further comprises: with the cryptographic hash of described perdurable data as hash function, utilize hash function to set up the corresponding relation of cryptographic hash and memory location.
Also comprise between described step 3 and the step 4: described caching server is provided with deletion frequency or a duration threshold value, and the deletion reading frequency is lower than described deletion frequency, perhaps is read last time apart from current to surpass the data cached of described duration threshold value.
Also comprise between described step 3 and the step 4: described caching server is according to manual or mode regularly, scan described data cached whether the data corresponding with described database server are consistent, with the Data Update that changes in the described database server to described caching server.
The invention also discloses a kind of matrix type data caching device of using based on WEB, be used to comprise the WEB application system of portal server and database server, and be connected, comprising with described portal server:
The buffer memory read module is used for the request according to described portal server, and the data that read from described database server are carried out buffer memory;
Mapping block is used for described data are carried out object/relationship map, obtains perdurable data;
The matrix form data structure is set up module, and being used to utilize Hash table is that described perdurable data is set up index, forms the matrix form data structure;
Access modules is used for providing data access interface according to described index.
Be provided with a frequency threshold and a capacity threshold in the described buffer memory read module, the described data cached frequency that is read is higher than described frequency threshold, and described data cached data volume is lower than described capacity threshold.
Described mapping block utilizes hibernate framework or ibatis framework to realize object/relationship map.
Described matrix form data structure is set up module with the cryptographic hash of described perdurable data as hash function, utilizes hash function to set up the corresponding relation of cryptographic hash and memory location.
Effect of the present invention is, has exchanged high-level efficiency for low cost, reduces WEB application server and the mutual traffic of database server, has reduced magnetic disc i/o read-write number of times.Simultaneously, data are persistences.The WEB application program generally all is to adopt OO thought to develop deployment, and the matrix type data caching technology becomes the data object of persistence with the data-switching in the database, has made things convenient for the use of WEB application program.Data structure is a matrix form, under the situation that does not almost increase the memory source use, has enriched the mode of data query, utilizes these index to provide interface and method very flexibly for functions such as ordering, statistics simultaneously.
Description of drawings
Figure 1 shows that the structural representation of WEB application system;
Figure 2 shows that the structural representation of the portal server in the WEB application system;
Fig. 3 A, 3B are depicted as the application's operational processes schematic flow sheet.
Embodiment
Below cooperate embodiment and accompanying drawing, describe technical characterictic of the present invention in detail.
The present invention is directed to the problems that exist in the WEB application under the big situation of concurrent user's quantity, a kind of matrix form caching method and device of using based on WEB is provided, improved data reading speed, it is efficient that the WEB application is enriched more.Matrix type data caching method of the present invention promptly is to utilize impact damper to preserve the method for perdurable data in the webpage with indexed mode.
See also the structural representation that Figure 1 shows that the WEB application system.
See also and Figure 2 shows that portal server 103 in the embodiment that caching server 105 is deployed in, the structural representation of portal server.
Except that other necessary parts well known in the prior art, also comprise a buffer 11 in portal server 103 inside.The inside short-access storage that this buffer 11 is stored data base Query Result or any temporary object can for example be an internal memory, and the quantity of this internal memory can be provided with as required.This buffer 11 further comprises: buffer memory read module 111, mapping block 112, matrix form data structure are set up module 113 and access modules 114.
Buffer memory read module 111 is used for the request according to described portal server, and the data that read from described database server are carried out buffer memory; Mapping block 112 is used for described data are carried out object/relationship map, obtains perdurable data; The matrix form data structure is set up module 113, and being used to utilize Hash table is that described perdurable data is set up index, forms the matrix form data structure; Access modules 114 is used for providing data access interface according to described index.
Utilize this buffer 11, the present invention will disclose a kind of matrix type data caching method of using based on WEB.
When user terminal is initiated operation requests to portal website, portal server 103 receives this request and needs read the data in the database server 104 in real time according to this request.
In this application, the data that read from database server 104 of 11 pairs of portal servers 103 of buffer are carried out buffer memory.That is, the database table of user's request call is buffered in the buffer, and inquires about needed concrete data therein.
After this buffer starts also initialization, need manage to the data of storing in the buffer.Set in advance cached configuration strategy, buffer memory deletion strategy, buffer update strategy in the buffer memory read module 111 of this buffer, buffer will be according to above-mentioned rule to carry out data cached increase, deletion and renewal.
Wherein, the cached configuration strategy is used for increasing database table to buffer, and the cached configuration strategy comprises database table frequency configuration and size of data configuration etc.
The database table frequency configuration has been stipulated a frequency of utilization threshold value f, the data that the frequency that is called are higher than this threshold value f are carried out buffer memory, promptly, buffer monitor database table frequency of utilization, to frequently be called, the database table of data processing complex carries out caching process, and is and little for frequency of utilization, do not have the database table of complex data processing requirements not carry out caching process, to save spatial cache, prevent to take too much resource.
The size of data configuration has stipulated a capability value v database table that is higher than this capability value v not to be carried out buffer memory, that is, the database table that surpasses this capability value will directly read from database server, saves spatial cache with the quick access more data.
Among the present invention, utilize the configuration of database table frequency configuration and size of data, can will often use in the webpage, the database table that frequently calls in the Client-initiated request and data volume is of moderate size reads in the buffer 11 by an I/O operation to database server 104.When subsequent user is initiated call request to described database table, directly from buffer 11, read, and need not to repeat the I/O operation of database server 104.
After buffer started, buffer memory read module 111 will be according to the parameter that disposes in this cached configuration strategy, and the database table of needs is read in buffer.
The buffer memory deletion strategy adopts be least recently used (Least Recently Used, LRU) principle that is to say, this buffer memory deletion strategy correspondence is provided with the lowest limit of a frequency of utilization or used last time apart from present duration restriction.Buffer Monitoring Data frequency of utilization, used apart from the database table that surpasses the duration restriction now, last time low for frequency of utilization, will delete, and read in other data according to the cached configuration strategy.
The buffer update strategy is used to keep the synchronous of buffer and database server.It includes regularly synchronous and manual synchronization dual mode.Regularly the method for synchronization is that the buffer memory read module 111 of buffer starts a update service program regularly, and whether the database table in the timing scan buffer is consistent with the correspondence database table of database server.For the database table that changes in the database server, with the Data Update in the database server to buffer.Manual synchronization needs buffer that the Data Update interface is provided, and when the database table in the database server changes, calls this Data Update interface, and the result who upgrades is fed back in the buffer.
Be depicted as the application's operational processes schematic flow sheet as Fig. 3 A, 3B.
Step 301, the data in the portal server real-time update database server are finished increase, deletion, the modification of data;
Step 302 starts and the initialization buffer;
Step 303, buffer memory read module 111 carries out buffer memory according to the cached configuration strategy to data;
Step 304,112 pairs of data cached object/relationship map of carrying out of mapping block obtain perdurable data;
At present, relational database remains most popular data repository.What deposit in the relational database is relational data, and it is non-OO.And the data structure of object type will be brought interface and application mode more flexibly for the WEB infosystem.
The present invention utilizes ORM of the prior art (Object Relational Mapping, object/relationship map) framework, and the relational data of buffer memory is become object type data.Just, by using the metadata of shining upon between description object and the relation data, the form of translation data makes relation data show with the form of object.And these object tissue are got up by the mode of object-oriented (Object-Oriented).With the data cached perdurable data that is converted to.Described ORM framework can for example be the hibernate framework or the ibatis framework.
Step 305, matrix form data structure are set up module 113 and are utilized Hash table that perdurable data is set up index, form the persistence access mechanism, set up the matrix form data structure;
For this perdurable data, utilize Hash table that perdurable data is set up multiple index, thereby set up the matrix form data structure, be convenient to user's multiple inquiry mode.
With the cryptographic hash of described perdurable data as hash function, utilize hash function to set up the corresponding relation of cryptographic hash and memory location, thereby perdurable data is set up index, form the matrix form data structure.Described memory location for example is the subscript of a Multidimensional numerical.Can utilize multiple hash function to set up multiple index.When inquiring about or retrieve, can utilize this index, determine the memory location, and then locate fast.
Step 306, access modules 114 provides data access interface according to different index;
User terminal is diversified for the demand of data, may be the ordering that comprises various index, statistics etc.Access modules 114 is according to the interface of each index encapsulation access cache data, makes that the user can be according to demand, direct query caching data, and qualified data are returned to user terminal.
And the matrix form data structure provides interface and method comparatively flexibly for the statistics that portal server carries out the representing of various ways data, report data.
Step 307, user terminal are utilized described data access interface, the data in the access cache device.
In another preferred embodiment of the present invention, also can comprise between step 305 and the step 306:
Step 3051 is judged the current required operation of carrying out according to buffer memory deletion strategy, buffer update strategy and cached configuration strategy, if deletion, execution in step 3052, if upgrade, execution in step 3053, if read once more, execution in step 3054;
Step 3052 for the data of needs deletion, is utilized the index of having set up, and searches its memory location, it is deleted, and delete its corresponding index, execution in step 306;
Step 3053 for the needs data updated, is utilized the index of having set up, and searches its memory location, it is upgraded execution in step 304;
Step 3054 is for the data that need read once more, according to the cached configuration strategy, whether the data that judgement is desired to read meet database table frequency configuration and size of data configuration, if read these data to buffer, and execution in step 304, if not, execution in step 306.
Compare with traditional direct accessing database of web application server, the matrix type data caching technology has the following advantages:
1, low cost exchanges high-level efficiency for.Only need to increase the internal memory of caching server, and do not need to increase the quantity of computing machine.
2, reduce web application server and the mutual traffic of database server, promptly utilize this caching server can reduce transmission quantity at process and machinery compartment.
3, reduce magnetic disc i/o read-write number of times.
4, data are persistences.The WEB application program generally all is to adopt OO thought to develop deployment, and the matrix type data caching technology becomes the data object of persistence with the data-switching in the database, has made things convenient for the use of WEB application program.
5, data structure is a matrix form.The method that adopts Hash table is that the data object of persistence is set up different index, form the data structure of matrix form, under the situation that does not almost increase the memory source use, enriched the mode of data query, utilized these index to provide interface and method very flexibly simultaneously for functions such as ordering, statistics.
As seen, the present invention adopts the mode of trading space for time, and improves the promptness of data response and the extensibility of weblication.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (10)
1. matrix type data caching method of using based on WEB is used to comprise it is characterized in that the WEB application system of portal server and database server, comprising:
Step 1 is provided with a caching server, and the request according to described portal server is carried out buffer memory from the data that database server reads;
Step 2 to the described data cached object/relationship map of carrying out, obtains perdurable data;
Step 3, utilizing Hash table is that described perdurable data is set up index, forms the matrix form data structure;
Step 4, described caching server provides data access interface according to described index.
2. the method for claim 1 is characterized in that, described step 1 further comprises:
Described caching server is provided with a frequency threshold and a capacity threshold, reading frequency and data volume to the data that read from database server are monitored, be higher than described frequency threshold for reading frequency, data volume is lower than the data of described capacity threshold and carries out buffer memory.
3. the method for claim 1 is characterized in that, described step 2 further comprises:
Described object/relationship map utilizes hibernate framework or ibatis framework to realize.
4. the method for claim 1 is characterized in that, described step 3 further comprises:
With the cryptographic hash of described perdurable data, utilize hash function to set up the corresponding relation of cryptographic hash and memory location as hash function.
5. as claim 1,2,3 or 4 described methods, it is characterized in that, also comprise between described step 3 and the step 4:
Described caching server is provided with deletion frequency or a duration threshold value, and the deletion reading frequency is lower than described deletion frequency, perhaps is read last time apart from current to surpass the data cached of described duration threshold value.
6. as claim 1,2,3 or 4 described methods, it is characterized in that, also comprise between described step 3 and the step 4:
Described caching server is according to manually or mode regularly, scans described data cached whether the data corresponding with described database server are consistent, with the Data Update that changes in the described database server to described caching server.
7. matrix type data caching device of using based on WEB is used to comprise the WEB application system of portal server and database server, and is connected with described portal server, it is characterized in that, comprising:
The buffer memory read module is used for the request according to described portal server, and the data that read from described database server are carried out buffer memory;
Mapping block is used for described data are carried out object/relationship map, obtains perdurable data;
The matrix form data structure is set up module, and being used to utilize Hash table is that described perdurable data is set up index, forms the matrix form data structure;
Access modules is used for providing data access interface according to described index.
8. device as claimed in claim 7 is characterized in that,
Be provided with a frequency threshold and a capacity threshold in the described buffer memory read module, the described data cached frequency that is read is higher than described frequency threshold, and described data cached data volume is lower than described capacity threshold.
9. device as claimed in claim 7 is characterized in that, described mapping block utilizes hibernate framework or ibatis framework to realize object/relationship map.
10. as claim 7,8 or 9 described devices, it is characterized in that described matrix form data structure is set up module with the cryptographic hash of described perdurable data as hash function, utilizes hash function to set up the corresponding relation of cryptographic hash and memory location.
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