CN106933611A - Kind loading method and Classloader - Google Patents
Kind loading method and Classloader Download PDFInfo
- Publication number
- CN106933611A CN106933611A CN201511023447.1A CN201511023447A CN106933611A CN 106933611 A CN106933611 A CN 106933611A CN 201511023447 A CN201511023447 A CN 201511023447A CN 106933611 A CN106933611 A CN 106933611A
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- Prior art keywords
- classloader
- lib
- plug
- unit
- class
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/445—Program loading or initiating
- G06F9/44521—Dynamic linking or loading; Link editing at or after load time, e.g. Java class loading
- G06F9/44526—Plug-ins; Add-ons
Abstract
The present invention provides a kind of kind loading method and Classloader；A kind of kind loading method includes：First Classloader searches the first kind in the storehouse LIB of plug-in unit；Wherein, the plug-in unit includes first Classloader；If first Classloader finds the first kind in the LIB, using the definition of the first kind described in the LIB, the first kind is loaded.The present invention can not include identical class in solving the LIB of the plug-in unit in the prior art and LIB of host program, and cause the problem of application development inconvenience.
Description
Technical field
The present invention relates to computer realm, more particularly to a kind of kind loading method and Classloader.
Background technology
Host program is for the carrier for plug-in component operation, while also specify the access criteria of plug-in unit.Insert
Part is a kind of program module, that is, refer to the access criteria for meeting service platform, can run on service platform
, and non-serving platform necessary function or business module in itself.Wherein, plug-in unit and host's journey
Sequence can be packaged in different Android installation kits (APK, Android Package).
In the prior art, each APK can include a storehouse (LIB, Library), in LIB
Definition including class.When the Classloader of plug-in unit needs one class of loading：The Classloader first can
Notify that father's loader of the Classloader loads such；When father's loader is in the LIB of host program
When finding such, such the definition in the LIB of host program completes such loading, and
Such object is returned into the Classloader；When father's loader is not looked into the LIB of host program
When finding such, such lookup result will not found and return to the Classloader, by the Classloader
Complete such loading；When the Classloader receives such object of father's loader return, and should
When Classloader determines to also include such definition in the LIB of plug-in unit, it may appear that class repeats loading
Mistake.
Therefore, exist in the prior art can not include in the LIB of the plug-in unit and LIB of host program it is identical
Class, and cause application development inconvenience problem.
The content of the invention
The present invention provides a kind of kind loading method and Classloader, is used to solve plug-in unit in the prior art
Identical class can not be included in the LIB of LIB and host program, and cause asking for application development inconvenience
Topic.
The present invention provides a kind of kind loading method, including：
First Classloader searches the first kind in the LIB of plug-in unit；Wherein, the plug-in unit includes described the
One Classloader；
If first Classloader finds the first kind in the LIB, the LIB is used
Described in the first kind definition, the first kind is loaded.
Optionally, in an embodiment of the present invention, first Classloader is searched in the LIB of plug-in unit
After the first kind, also include：
If first Classloader does not find the first kind in the LIB, Equations of The Second Kind is notified
Loader is loaded to the first kind；
Wherein, second Classloader is father's loader of first Classloader.
Optionally, in an embodiment of the present invention, first Classloader is searched in the LIB of plug-in unit
Before the first kind, or first Classloader is also wrapped after the lookup first kind in the LIB of plug-in unit
Include：
First Classloader by all classes defined in the LIB, in second Classloader
Registered.
Optionally, in an embodiment of the present invention, first Classloader is by defined in the LIB
All classes, are registered in second Classloader, including：
First Classloader is by the path of the class name of all classes defined in the LIB and the plug-in unit
Corresponding relation, be added to the class list of second Classloader.
Optionally, in an embodiment of the present invention, first Classloader is DexClassLoader,
Second Classloader is PathClassLoader.
The present invention provides a kind of Classloader, and the Classloader is the first Classloader, the class loading
Device includes：
Searching modul, for searching the first kind in the LIB of plug-in unit；Wherein, the plug-in unit includes described
Classloader；
Load-on module, if finding the first kind in the LIB for the searching modul, makes
With the definition of the first kind described in the LIB, the first kind is loaded.
Optionally, in an embodiment of the present invention, also include：Notification module, if for the lookup mould
Block does not find the first kind in the LIB, then notify that the second Classloader enters to the first kind
Row loading；
Wherein, second Classloader is father's loader of first Classloader.
Optionally, in an embodiment of the present invention, also include：Registering modules, for by the LIB
All classes of definition, are registered in second Classloader.
Optionally, in an embodiment of the present invention, the Registering modules, specifically for by the LIB
The class name of all classes of definition and the corresponding relation in the path of the plug-in unit, are added to the Equations of The Second Kind loading
The class list of device.
Optionally, in an embodiment of the present invention, first Classloader is DexClassLoader,
Second Classloader is PathClassLoader.
The present invention provides a kind of kind loading method and Classloader；Loading is needed by when the first Classloader
During the first kind, the first kind is searched in the LIB of plug-in unit；If finding the first kind in the LIB,
Then using the definition of the first kind described in the LIB, the first kind is loaded；So that working as plug-in unit
LIB and host program LIB in when all including the first kind, be not in that the Classloader of plug-in unit is received
Such object that father's loader of the Classloader is returned, and the Classloader of plug-in unit determines plug-in unit
The scene of such definition is also included in LIB；Therefore, be also not in the mistake of class repetition loading；
So that can include identical class in the LIB of the LIB of plug-in unit and host program, the exploitation of application program is more
Plus flexibly, conveniently.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to reality
The accompanying drawing to be used needed for example or description of the prior art is applied to be briefly described, it should be apparent that, under
Accompanying drawing in the description of face is some embodiments of the present invention, for those of ordinary skill in the art,
On the premise of not paying creative labor, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of kind loading method embodiment one of the present invention；
Fig. 2 is the flow chart of kind loading method embodiment two of the present invention；
Fig. 3 is the flow chart of kind loading method embodiment three of the present invention；
Fig. 4 is the structural representation of Classloader embodiment one of the present invention；
Fig. 5 is the structural representation of Classloader embodiment two of the present invention.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with this hair
Accompanying drawing in bright embodiment, is clearly and completely described to the technical scheme in the embodiment of the present invention,
Obviously, described embodiment is a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained under the premise of creative work is not made
The every other embodiment for obtaining, belongs to the scope of protection of the invention.
Fig. 1 is the flow chart of kind loading method embodiment one of the present invention；As shown in figure 1, the present embodiment
Method can include：
Step 101, the first Classloader search the first kind in the LIB of plug-in unit；Wherein, the plug-in unit
Including first Classloader；
If step 102, first Classloader find the first kind in the LIB, make
With the definition of the first kind described in the LIB, the first kind is loaded.
In the present embodiment, by when the first Classloader needs the loading first kind, in the LIB of plug-in unit
Search the first kind；If finding the first kind in the LIB, using first described in the LIB
The definition of class, loads to the first kind；So that when in the LIB of plug-in unit and the LIB of host program
All include the first kind when, be not in plug-in unit Classloader receive the Classloader father's loader return
Such object, and the Classloader of plug-in unit determines to also include such definition in the LIB of plug-in unit
Scene；Therefore, be also not in the mistake of class repetition loading；So that the LIB of plug-in unit and host program
Identical class can be included in LIB, the exploitation of application program more facilitates；Solve and insert in the prior art
Identical class can not be included in the LIB of the part and LIB of host program, and cause application development inconvenience
Problem.
Fig. 2 is the flow chart of kind loading method embodiment two of the present invention；As shown in Fig. 2 the present embodiment
Method can include：
Step 201, the first Classloader search the first kind in the LIB of plug-in unit；Wherein, the plug-in unit
Including first Classloader；
Optionally, first Classloader is that Android (android) system extends Classloader
DexClassLoader。
If step 202, first Classloader find the first kind in the LIB, make
With the definition of the first kind described in the LIB, the first kind is loaded；
If step 203, first Classloader do not find the first kind in the LIB,
Notify that the second Classloader is loaded to the first kind.
Wherein, second Classloader is father's loader of first Classloader.
Optionally, second Classloader is that Android android operating systems give tacit consent to Classloader
PathClassLoader。
Optionally, second Classloader is loaded to the first kind, including：The Equations of The Second Kind
Loader searches the first kind in the LIB of host program, and after the first kind is found, uses
The definition of the first kind described in the LIB of the host program, loads to the first kind.
Optionally, before step 201 or after step 201, can also include：The first kind loading
Device is registered all classes defined in the LIB in second Classloader.Due to when the
When tripartite jar bags are with reflex mechanism loading classes, the second Classloader is used to be loaded, and existing skill
The second Classloader can not load the class defined in the LIB of plug-in unit in art；In the present embodiment, by inciting somebody to action
All classes defined in the lIB, are registered so that third party Jar in second Classloader
Bag can load the class defined in the LIB of the plug-in unit by the second Classloader.
It should be noted that all classes by defined in the LIB, in second loader
The operation registered, can be realized by first Classloader, or can also be by the plug-in unit
Other codes realize.
Optionally, first Classloader is by all classes defined in the LIB, in the Equations of The Second Kind
Registered in loader, including：
First Classloader is by the path of the class name of all classes defined in the LIB and the plug-in unit
Corresponding relation, be added to the class list of second Classloader.
Wherein, the class list can be with as shown in table 1 below；
Table 1
| Class name | Path |
| aa | 11\22\33 |
| bb | 11\22\33 |
| …… | …… |
Wherein, aa, bb are the class name of the class defined in the LIB of the plug-in unit, 11 22 33 inserted for described
The path of part.
In the present embodiment, by when the first Classloader needs the loading first kind, in the LIB of plug-in unit
Search the first kind；If finding the first kind in the LIB, using first described in the LIB
The definition of class, loads to the first kind；If first Classloader is not looked into the LIB
The first kind is found, then notifies that the second Classloader is loaded to the first kind；So that working as plug-in unit
LIB and host program LIB in when all including the first kind, be not in that the Classloader of plug-in unit is received
Such object that father's loader of the Classloader is returned, and the Classloader of plug-in unit determines plug-in unit
The scene of such definition is also included in LIB；Therefore, be also not in the mistake of class repetition loading；
So that can include identical class in the LIB of the LIB of plug-in unit and host program, the exploitation of application program is more
Plus it is convenient, improve development efficiency.
Fig. 3 is the flow chart of kind loading method embodiment three of the present invention；As shown in figure 3, in step 301,
DexClassLoader first looks for the definition of a certain class from the LIB A of plug-in unit itself；In step 302 when
When DexClassLoader does not find such definition in the LIB A of plug-in unit, then father's loader is notified
PathClassLoader looks for such definition from the LIB B of host program.
In the present embodiment, by rewriteeing the pattern of DexClassLoader loading classes, remove parents and appoint original
Use then, allows plug-in unit preferentially to use the class defined in the LIB of plug-in unit；So as to allow the LIB of plug-in unit
Include identical class with the LIB of host.
Fig. 4 is the structural representation of Classloader embodiment one of the present invention, the Classloader in the present embodiment
It is the first Classloader；As shown in figure 4, the Classloader of the present embodiment can include：Searching modul 401
With load-on module 402.Wherein, searching modul 401, for searching the first kind in the storehouse LIB of plug-in unit；
Wherein, the plug-in unit includes the Classloader；Load-on module 402, if existing for the searching modul
The first kind is found in the LIB, then using the definition of the first kind described in the LIB, to institute
The first kind is stated to be loaded.
The Classloader of the present embodiment, can be used for performing the technical scheme of embodiment of the method shown in Fig. 1,
Its realization principle is similar with technique effect, and here is omitted.
Fig. 5 is the structural representation of Classloader embodiment two of the present invention, as shown in figure 5, the present embodiment
Classloader on the basis of Classloader structure shown in Fig. 4, further, can also include：It is logical
Know module 403, if not finding the first kind in the LIB for the searching modul, lead to
Know that the second Classloader is loaded to the first kind.
Optionally, the Classloader of the present embodiment, can also include：Registering modules 404, for by institute
The all classes defined in LIB are stated, is registered in second Classloader.
Optionally, Registering modules 404, specifically for by the class name of all classes defined in the LIB with
The corresponding relation in the path of the plug-in unit, is added to the class list of second Classloader.
Optionally, first Classloader is DexClassLoader, and second Classloader is
PathClassLoader。
The Classloader of the present embodiment, can be used for performing the technology of embodiment of the method shown in Fig. 2, Fig. 3
Scheme, its realization principle is similar with technique effect, and here is omitted.
One of ordinary skill in the art will appreciate that：Realize all or part of step of above-mentioned each method embodiment
Suddenly can be completed by the related hardware of programmed instruction.Foregoing program can be stored in a computer can
In reading storage medium.The program upon execution, performs the step of including above-mentioned each method embodiment；And
Foregoing storage medium includes：ROM, RAM, magnetic disc or CD etc. are various can be with store program codes
Medium.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than right
Its limitation；Although being described in detail to the present invention with reference to foregoing embodiments, this area it is common
Technical staff should be understood：It can still modify to the technical scheme described in foregoing embodiments,
Or equivalent is carried out to which part or all technical characteristic；And these modifications or replacement, and
The scope of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution is not made.
Claims (10)
1. a kind of kind loading method, it is characterised in that including：
First Classloader searches the first kind in the storehouse LIB of plug-in unit；Wherein, the plug-in unit includes described
First Classloader；
If first Classloader finds the first kind in the LIB, the LIB is used
Described in the first kind definition, the first kind is loaded.
2. method according to claim 1, it is characterised in that first Classloader is in plug-in unit
LIB in search the first kind after, also include：
If first Classloader does not find the first kind in the LIB, Equations of The Second Kind is notified
Loader is loaded to the first kind；
Wherein, second Classloader is father's loader of first Classloader.
3. method according to claim 2, it is characterised in that first Classloader is in plug-in unit
LIB in search the first kind before, or first Classloader searches first in the LIB of plug-in unit
After class, also include：
First Classloader by all classes defined in the LIB, in second Classloader
Registered.
4. method according to claim 3, it is characterised in that first Classloader will be described
All classes defined in LIB, are registered in second Classloader, including：
First Classloader is by the path of the class name of all classes defined in the LIB and the plug-in unit
Corresponding relation, be added to the class list of second Classloader.
5. the method according to claim any one of 2-4, it is characterised in that the first kind loading
Device is DexClassLoader, and second Classloader is PathClassLoader.
6. a kind of Classloader, the Classloader is the first Classloader, it is characterised in that the class
Loader includes：
Searching modul, for searching the first kind in the storehouse LIB of plug-in unit；Wherein, the plug-in unit includes institute
State Classloader；
Load-on module, if finding the first kind in the LIB for the searching modul, makes
With the definition of the first kind described in the LIB, the first kind is loaded.
7. Classloader according to claim 6, it is characterised in that also include：Notification module,
If not finding the first kind in the LIB for the searching modul, Equations of The Second Kind loading is notified
Device is loaded to the first kind；
Wherein, second Classloader is father's loader of first Classloader.
8. Classloader according to claim 7, it is characterised in that also include：Registering modules,
For by all classes defined in the LIB, being registered in second Classloader.
9. Classloader according to claim 8, it is characterised in that the Registering modules, specifically
For by the class name of all classes defined in the LIB and the corresponding relation in the path of the plug-in unit, adding
To the class list of second Classloader.
10. the Classloader according to claim any one of 7-9, it is characterised in that described first
Classloader is DexClassLoader, and second Classloader is PathClassLoader.
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| CN201511023447.1A CN106933611B (en) | 2015-12-31 | 2015-12-31 | Class loading method and class loader |
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| CN201511023447.1A CN106933611B (en) | 2015-12-31 | 2015-12-31 | Class loading method and class loader |
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| CN106933611B CN106933611B (en) | 2020-04-28 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106201592A (en) * | 2016-06-29 | 2016-12-07 | 北京小米移动软件有限公司 | A kind of method and apparatus searching class |
| CN109697103A (en) * | 2018-08-21 | 2019-04-30 | 平安普惠企业管理有限公司 | Kind loading method, device, equipment and readable storage medium storing program for executing |
| CN110308945A (en) * | 2019-05-22 | 2019-10-08 | 百度在线网络技术（北京）有限公司 | The dynamic loading method and device of plug-in unit |
| CN112131000A (en) * | 2020-09-23 | 2020-12-25 | 腾讯科技（深圳）有限公司 | Memory release method and device for plug-in application program |
| CN112612530A (en) * | 2019-09-18 | 2021-04-06 | 华为技术有限公司 | Class query method and device |
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| US20070198484A1 (en) * | 2006-02-22 | 2007-08-23 | Nawaaz Ahmed | Query serving infrastructure |
| CN102411506A (en) * | 2011-07-07 | 2012-04-11 | 杭州典能科技有限公司 | Java-system business-unit plug-in type managing system and dynamic business-function changing method |
| CN104699547A (en) * | 2015-03-19 | 2015-06-10 | 北京东方通科技股份有限公司 | Java EE application class loading conflict analyzing method and device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20070198484A1 (en) * | 2006-02-22 | 2007-08-23 | Nawaaz Ahmed | Query serving infrastructure |
| CN102411506A (en) * | 2011-07-07 | 2012-04-11 | 杭州典能科技有限公司 | Java-system business-unit plug-in type managing system and dynamic business-function changing method |
| CN104699547A (en) * | 2015-03-19 | 2015-06-10 | 北京东方通科技股份有限公司 | Java EE application class loading conflict analyzing method and device |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106201592A (en) * | 2016-06-29 | 2016-12-07 | 北京小米移动软件有限公司 | A kind of method and apparatus searching class |
| CN109697103A (en) * | 2018-08-21 | 2019-04-30 | 平安普惠企业管理有限公司 | Kind loading method, device, equipment and readable storage medium storing program for executing |
| CN110308945A (en) * | 2019-05-22 | 2019-10-08 | 百度在线网络技术（北京）有限公司 | The dynamic loading method and device of plug-in unit |
| CN110308945B (en) * | 2019-05-22 | 2022-07-05 | 百度在线网络技术（北京）有限公司 | Dynamic loading method and device of plug-in |
| CN112612530A (en) * | 2019-09-18 | 2021-04-06 | 华为技术有限公司 | Class query method and device |
| CN112612530B (en) * | 2019-09-18 | 2022-05-17 | 华为技术有限公司 | Class query method and device |
| CN112131000A (en) * | 2020-09-23 | 2020-12-25 | 腾讯科技（深圳）有限公司 | Memory release method and device for plug-in application program |
| CN112131000B (en) * | 2020-09-23 | 2024-02-06 | 腾讯科技（深圳）有限公司 | Memory release method and device for plug-in application program |
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| CN106933611B (en) | 2020-04-28 |
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