CN101067820A - Method for prefetching object - Google Patents
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Abstract
This invention relates to a method for pre-taking objects in a permanent object-relationship system including receiving a read request and judging if information of an object is stored in the object buffer storage according to the kind and key words of the object corresponding to the read request, if so, the information of the object is returned, otherwise, the attribute information of said object is analyzed based on the object-relationship mapping information stored in the system then to store the generated information into the buffer storage, which introduces a pre-taking strategy to an object-relationship permanent system to suit the current complicated object design of multiple kinds and large numbers and increase the read hit ratio of the system to the utmost.
Description
Technical field
The present invention relates to a kind of method of prefetching object, especially a kind of in the object relationship persistent object system method of prefetching object.
Background technology
Increasingly mature along with the enterprise application software system, data volume to be processed in the system also is exponential growth, make application load be on the rise, the deficiency of the network bandwidth in addition, cause the user when using system, to postpone overlong time, therefore, improve the persistence application performance and become the main target that enterprise uses.Persistence promptly the data in the internal memory or document storing in the memory device that can forever preserve, specifically be meant the data storage in the internal memory in the database of relationship type.
The persistence operation comprises the various operations relevant with database, and persistent object system is positioned in the middle of Business Logic and the database layer, is responsible for data object is saved in the database.The effective method that improves the persistence application performance is to adopt caching technology.Buffer memory is the storage medium between application program and physical data source, and its effect is in order to reduce frequency or the number of times of application program to the visit of physical data source, to improve the runnability of using.Data in the buffer memory are to the duplicating of the data in the physical data source, application program when operation from buffer memory reading of data.The medium of buffer memory generally is used for the random access memory of calculator memory, and reading and writing speed is very fast; When the data volume of depositing if desired is very big, also can adopt hard disk as the buffer memory medium.
For in present, for the large software system, need the object kind of persistence many, quantity is big and the relation complicated.In large scale system, have dissimilar objects, the mapping relations between the object are also quite complicated, thereby increased the complexity of software systems greatly, reduced the performance of system.Therefore, when object was looked ahead, the cache prefetching method that adopts mainly was the order prefetching algorithm at present, promptly for the object of read request, only carried out the optimization of order when looking ahead.In not considering in this method that present persistence is used, therefore the object that kind is many, quantity is big and relation is complicated can't make more accurate prefetch policy to the incidence relation in the Object Query, is regardless of the size of object, all look ahead, can cause bigger network resources waste.
Summary of the invention
The purpose of the main embodiment of the present invention is to provide the method for prefetching object in a kind of object relationship persistent object system, can improve the hit rate of reading of system, has reduced the burden of network service simultaneously.
For this reason, the embodiments of the present invention provide the method for prefetching object in a kind of object relationship persistent object system, after comprising that persistent object system receives read request, judge whether store described read request object information in the target cache according to type, the key word of read request object; If storage is arranged, then return the read request object information to the user; If not storage, deposit in the target cache then according to each attribute of described read request object described read request object of institute's objects stored relationship map information analysis in persistent object system, and with the read request object information that generates.
The method of prefetching object in the object relationship persistent object system involved in the present invention, by introducing prefetch policy in the object relationship persistent object system, adapted to the object designs that kind is many in the present persistent object system, quantity big and relation is complicated, incidence relation in the Object Query is made more accurate prefetch policy, farthest improve the hit rate of reading of system, also greatly reduce simultaneously the burden of network service, improve enterprise's application performance.
Further specify technical scheme of the present invention below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is the method flow synoptic diagram of prefetching object in the object relationship persistent object system of the present invention.
Fig. 2 in the target cache during no object information persistent object system obtain read request object information process flow diagram.
Embodiment
Embodiment one,
As shown in Figure 1, when the user after persistent object system sends read request, after step 1 persistent object system receives read request, judge the information that whether stores described object in the target cache according to type, the key word of the object of read request correspondence; Step 2 is then returned the information of the object of read request correspondence if storage is arranged; Step 3 then according to described object institute's objects stored relationship map information in persistent object system, is analyzed the attribute information of described object if do not store, and the object information that generates is deposited in the target cache.
The present invention requires service object relationship map information in the object relationship persistent object system, to guarantee in subsequent operation, can carry out correct related and judgement, these map informations should comprise: each for the type of object, key word with and associated object information, object institute mapped data storehouse table, the pairing database list item that comprises database external key, relation table of the different attribute of object.The relational database of storage object information of the present invention can be any one relational database of current popular.
Little when the property value of object, promptly the type that is mapped in the database when the attribute information of object is not SQL (Structured Query Language; Hereinafter to be referred as: SQL) defined big character types (maximum admissible character capacity are 4G) when being often referred to BLOG or CLOG data type in the standard, the judgement of looking ahead judges whether described read request object properties are that expression comprises one to one, the incidence relation of one-to-many, many-one, multi-to-multi.
When this attribute information is not data type information such as BLOG or CLOG, and when not representing a kind of incidence relation information, be that this attribute is not the business object class, be exactly not represent that this object comprises other business objects specifically, then the row name in the pairing database table of the attribute information of described object is added in the sql like language inquiry, inquire about corresponding read request object information.SQL is a kind of Structured Query Language (SQL), is used for creating at relational database management system, obtains, renewal and deleted data, to authenticate through " ANSI " and " ISO " standardization body.Described business object is an object of describing business realizing, and it is to role in the practical business model and Business Entity.
When this attribute information is not data type information such as BLOG or CLOG, and represent a kind of incidence relation information, be that this attribute is the business object class, be exactly to represent that this object comprises other business objects specifically, this incidence relation can be one to one, one-to-many, many-one and multi-to-multi, then judge respectively again, judge that it is to point to quoting of single object, still point to quoting of a group objects, set up being connected of described object and reference object, the constructing SQL inquiry, and inquire about corresponding read request object information.
When this attribute information is not data type information such as BLOG or CLOG, and represent a kind of incidence relation information, and when pointing to the quoting of single object, this is quoted and is mapped as the database external key, is stored in the database table.The Object Relation Mapping information that using system is obtained in resolving before, by external key this object and reference object are connected, the constructing SQL inquiry, in the SQL query that takes turns, pre-all associated row that connect in the database in the table of taking out, the data set that is obtained is become object, put into target cache.
When this attribute information is not data type information such as BLOG or CLOG, and represent a kind of incidence relation information, and when pointing to the quoting an of group objects, this is quoted and is mapped as relation table, is stored in the database.The Object Relation Mapping information that using system is obtained in resolving before, by this relation table this object and reference object are connected, the constructing SQL inquiry, in the SQL query that takes turns, pre-all associated row that connect in the database in the table of taking out, obtain all associated objects, and this group objects is put into target cache.
In inquiry once, the object that is cited may relate to multistage outer the connection and many database tables, allows the developer to design the outer degree of depth that connects here, decides the outer connection degree of depth associated in one query.When outer connection specifically is meant SQL query, connect the mode of two database tables.If the record of database is few, and Database Systems have good table switching performance, this value can be established height.
With object information take out put into target cache after, adopt least recently used algorithm (hereinafter to be referred as: LRU) carry out computing.Lru algorithm key concept is that the remaining free space when internal memory is when not enough, buffer zone keeps user's data of normal use as much as possible earlier, be exactly the preferential data of more seldom using of removing, and discharge its space, if buffer memory takes, then least-recently-used object is eliminated out target cache.
When the attribute value object too big, be that the type that the attribute information of object is mapped in the database is BLOG or CLOG data type information, when object information does not exist in target cache, then do not carry out earlier data pre-fetching, but by being placed in the target cache for it generates a dynamic proxy.Described dynamic proxy is meant specifically and dynamically generates a class that when program run such has realized all method interfaces of specified services object.Such will handle class to one for the dynamic assignment of calling all of interface method, and intercepting and capturing are called, and handle.
Do not have real data in this dynamic proxy the inside.When this object is arrived in user capture, for calling of method wherein, can forward to and handle class, handle the instant constructing SQL statement of class by this again, with the corresponding row of described read request object, construct the object of request in the accessing database table, the large-scale data of being asked is transferred to the user from database, and write target cache, replace original dynamic proxy.
The purpose of this invention is to provide a kind of in the method for object relationship persistent object system prefetching object with the raising system performance.By introducing this prefetch policy in the object relationship persistent object system, farthest improve the hit rate of reading of system, also greatly reduce the burden of network service simultaneously.The present invention is by above-mentioned prefetch policy, and the object that is associated is all pre-loaded to buffer memory, according to principle of locality, farthest improve the hit rate of reading of system, have many more objects accessed, many more data base queryings are saved with regard to prefetched strategy, thereby bring bigger benefit.Simultaneously because the burden that also greatly reduces network service is read in the delay of large-scale data object.This uses for the enterprise that complex data operation is arranged at present has very big performance to improve, and by preserve common object in target cache, avoids the transmission of large-scale data as far as possible, also very big minimizing the expense of network service.
Embodiment two,
Based on embodiment one, present embodiment is specifically to illustrate the specific implementation process of method involved in the present invention based on prefetching object in " JPA " (Java Persistence API) persistence layer.JPA will obtain the support of all Java EE servers as the Object Relation Mapping standard of " Java EE 5.0 " language platform standard.JPA explains or XML (extensible Markup Language) (Extensible MarkupLanguage by " JDK 5.0 "; Hereinafter to be referred as the XML) mapping relations of description object relation table, and the entity object of runtime is persisted in the database, the API of JPA is used for the application entity object, carries out and creates, and reads, and upgrades and deletion action, and framework finishes all things on the backstage.
Realization based on JPA persistence layer comprises: at first, explain or the XML description according to " JDK 5.0 ", formation object relationship map information, specifically be meant the type of each object that is parsed, key word and its associated object information, object institute mapped data storehouse table, the pairing database list item of different attribute, comprising database external key and relation table, and be kept in the persistence layer, these map informations are divided into object model in the specific implementation, and object instance and the database model of having represented " Java " program design language to call the turn correspond to defined in the database " schema ".
At the API of user by JPA when the persistence layer is submitted the Object Query request to, the persistence layer to user inquiring request analyze, find out the type of institute's query object and the key word in the inquiry, at first in target cache, search by these parameters.In target cache, each object is a key assignments with its type and key word, deposits in the Hash table, is convenient to search fast.If this object hits in target cache, promptly the key assignments that generated of its type and key word is present in the Hash table, and then the object information with institute's buffer memory returns to the user.
Miss in target cache when this read request, then according to its institute's objects stored relationship map information in persistent object system, analyze each attribute of this object.
If this property value is little, even to be mapped to the type in the database be not data type information such as BLOG or CLOG to the attribute information of object, and not the business object class, be that its attribute is not represented a kind of incidence relation, be exactly not represent that this object comprises other business objects specifically, then the row name in the pairing database table of the attribute information of described object is added in the SQL query, inquires about corresponding read request object information, and with Query Result side as in the target cache.
If this property value is little, even to be mapped to the type in the database be not data type information such as BLOG or CLOG to the attribute information of object, and be the business object class, it is a kind of incidence relation of its attribute representation, be exactly to represent that this object comprises other business objects specifically, this incidence relation can be one to one, one-to-many, many-one and multi-to-multi, the judgement of then looking ahead.
Comprise one to one and many-one that for pointing to quoting of single object, being specially this is quoted and is mapped as the database external key, is stored in the database table.The Object Relation Mapping information that in resolving, obtained of using system then, specifically be meant the type of each object that is parsed, key word and its associated object information, object institute mapped data storehouse table, the pairing database list item of different attribute is comprising database external key and relation table.To connect between this object and reference object by this external key, the constructing SQL inquiry, between two tables, connect with " JOINS " key word, in the SQL query that takes turns, mode by " OUTER JOIN " is got associated data or set, obtain the entity object information quoted by same " SELECT " statement, put into target cache.
For pointing to quoting of a group objects, this is quoted and is mapped as relation table and is stored in the database.The Object Relation Mapping information that in resolving, obtained of using system then, then will connect between this object and reference object by this relation table, the constructing SQL inquiry, mode by " OUTER JOIN " is got associated data or set, realize by same " SELECT " statement, pre-all associated row that connect in the database in showing of taking out, the entity object ensemble of communication that acquisition is quoted, and this group objects put into target cache.
Take turns in the SQL query above-mentioned one, if the object that is cited relates to multistage outer the connection and many database tables, in this persistent layer, be provided with " FETCHDEPTH " parameter, allow the developer to dispose the outer degree of depth that connects, to determine the outer connection degree of depth associated in one query by this parameter.When the record of database is few, and Database Systems can establish high this value when having good table switching performance, with the raising performance.
With object information take out put into target cache after, adopt lru algorithm to manage, if promptly buffer memory takes, then least-recently-used object is eliminated out target cache.
If determine that the property value object is too big, even object map is BLOG or CLOG data type to the type in the database, when this read request is miss in target cache, do not carry out data pre-fetching, but by being placed in the target cache for it generates a dynamic proxy.Described dynamic proxy is meant specifically and dynamically generates a class that when program run such has realized all method interfaces of specified services object.Such will handle class to one for the dynamic assignment of calling all of interface method, and intercepting and capturing are called, and handle.Particularly, adopt CGLIB, generate dynamic proxy, generate the subclass of an original class, and set call back function, then when each method of original class is called, will forward in the method related in the generation class, carry out processing in advance.Described CGLIB be one powerful, high-performance, high-quality code generates class libraries, it can expand java class and realize the Java interface in the runtime, thereby can must be based on interface as dynamic " proxy " that " JDK " carries.
In described dynamic proxy, do not have real data, when this object of user capture, for calling of method wherein, can forward to and handle class, handle the instant constructing SQL statement of class by this again, the corresponding row of visit in database, construct the object of request, the large-scale data of being asked is transferred to the user from database, and writes target cache, replace original dynamic proxy.
It should be noted that at last: above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (15)
1, a kind of method of prefetching object is characterized in that: comprising:
After receiving read request,, judge the information that whether stores described object in the target cache according to type, the key word of the object of this read request correspondence;
If storage is arranged, then return the information of the object of read request correspondence;
Otherwise, according to described object institute's objects stored relationship map information in system, analyze the attribute information of described object, and the object information that generates deposited in the target cache.
2, method according to claim 1, it is characterized in that: after the attribute information of the described object of described analysis, also comprise: when the attribute information of described object is mapped to type in the database and is not BLOG or CLOG data type information, the judgement of looking ahead.
3, method according to claim 2 is characterized in that: the described judgement of looking ahead is specially the attribute information of judging described object and whether is that expression comprises one to one, the incidence relation information of one-to-many, many-one, multi-to-multi.
4, method according to claim 3 is characterized in that: after the described judgement of looking ahead, also comprise: when the attribute information of described object is not expression incidence relation information, and the object information of inquiry read request correspondence.
5, method according to claim 4 is characterized in that: the row name in the pairing database table of the attribute information of described object is added in the SQL query, inquire about.
6, want 3 described methods according to right, it is characterized in that: after the described judgement of looking ahead, also comprise: when the attribute information of described object is expression incidence relation information, inquire about the object information of described read request correspondence.
7, method according to claim 6 is characterized in that: set up the object of described read request correspondence and being connected of reference object, the constructing SQL inquiry is inquired about.
8, method according to claim 7, it is characterized in that: when the attribute information of the object of described read request correspondence is an expression incidence relation information, and when quoting single object, describedly setting up the object of described read request correspondence and being connected of reference object, specifically is to set up the object of described read request correspondence and being connected of reference object by the external key of database.
9, method according to claim 7, it is characterized in that: when the attribute information of the object of described read request correspondence is an expression incidence relation information, and when quoting a group objects, describedly setting up the object of described read request correspondence and being connected of reference object, specifically is to set up the object of described read request correspondence and being connected of reference object by the relation table of database.
10, method according to claim 6 is characterized in that: the object information of the described read request correspondence of described inquiry is to inquire about according to the degree of depth of the outer connection of setting.
11, according to the described arbitrary method of claim 1 to 10, it is characterized in that: after the information of the object that will generate deposits in the target cache, adopt information in the least recently used algorithm management object buffer memory.
12, method according to claim 1, it is characterized in that: after the attribute information of the described object of described analysis, also comprise: when the attribute information of described object is mapped to type in the database and is BLOG or CLOG data type information, do not carry out data pre-fetching, be stored in the target cache but generate a dynamic proxy.
13, method according to claim 12 is characterized in that: dynamic proxy of described generation is dynamically to generate a class, and described class is used to provide all method interfaces of described object.
14, method according to claim 13, it is characterized in that: do not have actual data information in the described dynamic proxy, when user capture, for calling of method wherein, to forward to and handle class, again by described processing class formation SQL query, in the accessing database table with the corresponding row of described object, structure request object information, and deposit the original dynamic proxy of replacement in the target cache in.
15, method according to claim 1 is characterized in that: described receiving before the read request also comprises: generate and store Object Relation Mapping information.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102214172A (en) * | 2010-04-06 | 2011-10-12 | 腾讯科技（深圳）有限公司 | Caching method and caching equipment |
| CN102479244A (en) * | 2010-11-30 | 2012-05-30 | 英业达股份有限公司 | Searching system and method capable of temporarily storing target data and unsearched data by container |
| CN102521260A (en) * | 2011-11-18 | 2012-06-27 | 华为技术有限公司 | Data preheating method and device |
| CN102722485A (en) * | 2011-03-29 | 2012-10-10 | 恒生电子股份有限公司 | Memory data set perception method and apparatus |
| CN102779092A (en) * | 2012-06-27 | 2012-11-14 | 用友软件股份有限公司 | Citing checking system and citing checking method |
| CN102930056A (en) * | 2012-11-21 | 2013-02-13 | 华为技术有限公司 | Search method and search device for cloud storage system |
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| CN105718556A (en) * | 2016-01-20 | 2016-06-29 | 北京京东尚科信息技术有限公司 | Database storage and query method, and attribute value acquisition method and device |
| CN106233298A (en) * | 2014-02-12 | 2016-12-14 | 尤尼斯康通用身份控制股份有限公司 | Protection database relation from have no right access method and system |
| CN106600170A (en) * | 2016-12-30 | 2017-04-26 | 江苏瑞中数据股份有限公司 | Automation data model realizing method suitable for oil gas long distance pipeline |
| CN106933919A (en) * | 2015-12-31 | 2017-07-07 | 北京国双科技有限公司 | The connection method of tables of data and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69827638T2 (en) * | 1997-08-06 | 2005-12-01 | Tachyon, Inc., San Diego | DISTRIBUTED SYSTEM AND OBJECT PRE-LOADING METHOD |
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- 2007-06-08 CN CNB2007101003401A patent/CN100437590C/en not_active Expired - Fee Related
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| CN102214172A (en) * | 2010-04-06 | 2011-10-12 | 腾讯科技（深圳）有限公司 | Caching method and caching equipment |
| CN102479244A (en) * | 2010-11-30 | 2012-05-30 | 英业达股份有限公司 | Searching system and method capable of temporarily storing target data and unsearched data by container |
| CN102722485A (en) * | 2011-03-29 | 2012-10-10 | 恒生电子股份有限公司 | Memory data set perception method and apparatus |
| CN102722485B (en) * | 2011-03-29 | 2014-09-03 | 恒生电子股份有限公司 | Memory data set perception method and apparatus |
| CN102521260A (en) * | 2011-11-18 | 2012-06-27 | 华为技术有限公司 | Data preheating method and device |
| CN102521260B (en) * | 2011-11-18 | 2014-04-02 | 华为技术有限公司 | Data preheating method and device |
| US9569489B2 (en) | 2011-11-18 | 2017-02-14 | Huawei Technologies Co., Ltd. | Method and apparatus for data preheating |
| CN102779092A (en) * | 2012-06-27 | 2012-11-14 | 用友软件股份有限公司 | Citing checking system and citing checking method |
| CN102779092B (en) * | 2012-06-27 | 2016-03-30 | 用友优普信息技术有限公司 | Quote check system and quote inspection method |
| CN102930056B (en) * | 2012-11-21 | 2016-11-23 | 华为技术有限公司 | The search method of cloud storage system and equipment |
| CN102930056A (en) * | 2012-11-21 | 2013-02-13 | 华为技术有限公司 | Search method and search device for cloud storage system |
| CN106233298A (en) * | 2014-02-12 | 2016-12-14 | 尤尼斯康通用身份控制股份有限公司 | Protection database relation from have no right access method and system |
| CN106233298B (en) * | 2014-02-12 | 2020-10-30 | 尤尼斯康通用身份控制股份有限公司 | Method and system for protecting database relationships from unauthorized access |
| CN104731644A (en) * | 2015-03-12 | 2015-06-24 | 用友网络科技股份有限公司 | Subobject operation method and device |
| CN106933919A (en) * | 2015-12-31 | 2017-07-07 | 北京国双科技有限公司 | The connection method of tables of data and device |
| CN106933919B (en) * | 2015-12-31 | 2020-03-03 | 北京国双科技有限公司 | Data table connection method and device |
| CN105718556A (en) * | 2016-01-20 | 2016-06-29 | 北京京东尚科信息技术有限公司 | Database storage and query method, and attribute value acquisition method and device |
| CN105718556B (en) * | 2016-01-20 | 2019-06-04 | 北京京东尚科信息技术有限公司 | Database purchase and querying method, attribute value-acquiring method and equipment |
| CN106600170A (en) * | 2016-12-30 | 2017-04-26 | 江苏瑞中数据股份有限公司 | Automation data model realizing method suitable for oil gas long distance pipeline |
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