CN106469102B - Software regeneration method and device in Java Virtual Machine - Google Patents
Software regeneration method and device in Java Virtual Machine Download PDFInfo
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Abstract
The present invention provides the software regeneration methods and device in a kind of Java Virtual Machine, are related to virtual machine technique field, solve the problems, such as that software regeneration is carried out in Java Virtual Machine in the prior art will affect the performance of Java Virtual Machine.Software regeneration method in the Java Virtual Machine includes: periodically to be regenerated at least one in method area, interpreter, compiler and the exception processing module in Java Virtual Machine respectively in Java Virtual Machine operational process；During carrying out periodically regenerated at least one in method area, interpreter, compiler and the exception processing module in Java Virtual Machine, the average information of Java Virtual Machine is saved, so that Java Virtual Machine continues to use the average information after regeneration is completed.The embodiment of the present invention Java Virtual Machine suitable for carrying out software regeneration.
Description
Technical field
The present invention relates to the software regeneration methods and dress in virtual machine technique field more particularly to a kind of Java Virtual Machine
It sets.
Background technique
Virtual machine is a kind of computer of abstract, passes through the various computer functions of analogue simulation on actual computer
Come what is realized.The framework that Java Virtual Machine has oneself perfect also has corresponding instruction system.Java Virtual Machine shields and has
Body operating system platform and the relevant information of bottom hardware, so that java applet need to only generate the mesh run on a java virtual machine
Mark code, so that it may run without modification in kinds of platform.
In Java Virtual Machine, the accidents such as data, file corruption or loss, shadow can occur for various reasons in system sometimes
The reliability of Java Virtual Machine is rung.For fault-toleranr technique exactly when occurring above-mentioned accident in Java Virtual Machine, system can be automatic
These corrupted or lost files and data are restored to accident, pervious state occur, enables a system to continuously operate normally,
Promote the reliability of Java Virtual Machine.In general, fault-toleranr technique includes hardware fault-tolerant technology and software fault-tolerant technology, wherein
There is a kind of software fault-tolerant technology to refer in Java Virtual Machine level, Java Virtual Machine is periodically restarted, software is passed through
It regenerates fault-tolerant to realize.
In the implementation of the present invention, inventor's discovery at least has the following technical problems in the prior art:
During carrying out software regeneration in Java Virtual Machine, need to stop the execution of java applet, to java applet
The method restarted with Java Virtual Machine, and then caused compiled needs to recompilate, and executes in these methods certain
Number and before recompilating completion, can only using explain execute by the way of carry out, the performance of java applet can be virtual in Java
Machine declines after restarting.Therefore, the existing mode that software regeneration is carried out in Java Virtual Machine, although being able to ascend Java void
The reliability of quasi- machine, but the performance of Java Virtual Machine will receive influence, or even can stop the execution of java applet.
Summary of the invention
Software regeneration method and device in Java Virtual Machine provided by the invention can guarantee Java Virtual Machine performance
While promoted Java Virtual Machine reliability.
In a first aspect, the present invention provides the software regeneration method in a kind of Java Virtual Machine, comprising:
In Java Virtual Machine operational process, respectively to method area, interpreter, compiler and the exception in Java Virtual Machine
At least one in processing module is periodically regenerated；
It is carried out at least one in method area, interpreter, compiler and the exception processing module in Java Virtual Machine
Periodically it is regenerated during, save the average information of Java Virtual Machine so that Java Virtual Machine regeneration complete with subsequent
It is continuous to use the average information.
Second aspect, the present invention provide the software regeneration device in a kind of Java Virtual Machine, comprising:
Regeneration unit is used in Java Virtual Machine operational process, respectively to the method area in Java Virtual Machine, explanation
Device, compiler and exception processing module are periodically regenerated；
Storage unit, for being carried out to method area, interpreter, compiler and the exception processing module in Java Virtual Machine
Periodically it is regenerated during, save the average information of Java Virtual Machine, so as to Java Virtual Machine regeneration complete with subsequent
It is continuous to use the average information.
Software regeneration method and device in Java Virtual Machine provided in an embodiment of the present invention, ran in Java Virtual Machine
Cheng Zhong carries out week at least one in method area, interpreter, compiler and the exception processing module in Java Virtual Machine respectively
The regeneration of phase property, and the average information of Java Virtual Machine is saved in the process, so that Java Virtual Machine is after regeneration is completed
Continue to use the average information.Compared with prior art, Java Virtual Machine is not out of service when carrying out software regeneration,
And the average information saved in regenerative process can continue to use after regeneration is completed, and thereby may be ensured that Java Virtual Machine
Performance and the execution that java applet will not be stopped；Moreover, being carried out to method area, interpreter, compiler and exception processing module
It regenerates to sub-module, regenerated speed can be improved, reduce the delay of java applet, guarantee the performance of Java Virtual Machine；Therefore,
The reliability of Java Virtual Machine can be promoted while guaranteeing Java Virtual Machine performance.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only
Some embodiments of the present invention without creative efforts, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is the flow chart of the software regeneration method embodiment one in Java Virtual Machine of the present invention；
Fig. 2 is the structural schematic diagram of the software regeneration Installation practice one in Java Virtual Machine of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
It is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention provides the software regeneration method in a kind of Java Virtual Machine, and Fig. 1 is soft in Java Virtual Machine of the present invention
The flow chart of part regeneration method embodiment one, as shown in Figure 1, the method for the present embodiment includes:
S11, in Java Virtual Machine operational process, Java Virtual Machine respectively in Java Virtual Machine method area, explain
At least one in device, compiler and exception processing module is periodically regenerated.
Specifically, Java Virtual Machine can be according to the frequency of the accidents such as data, file corruption or loss generation in system
The regeneration period is arranged in method area, interpreter, compiler and exception processing module, so that Java Virtual Machine can in time damage these
File and data bad or lose are restored to accident and pervious state occur.Wherein it is possible to be method area, interpreter, compiler
The identical regeneration period is set with exception processing module；It is alternatively possible to according to method area, interpreter, compiler and exception
The frequency that the accidents such as data, file corruption or loss occur in module is managed, respectively the respective regeneration period is arranged in it.For solution
It releases for device and compiler, if explaining execution or compiling to some method, needs to execute or compile explaining
Complete and then carry out regenerative operation.
S12, in method area, interpreter, compiler and the exception processing module in Java Virtual Machine at least one of
Carry out periodically it is regenerated during, Java Virtual Machine save Java Virtual Machine average information so that Java Virtual Machine exists
Regeneration continues to use the average information after completing.
Software regeneration method in Java Virtual Machine provided in an embodiment of the present invention, in Java Virtual Machine operational process,
At least one in method area, interpreter, compiler and the exception processing module in Java Virtual Machine is carried out periodically respectively
Regeneration, and in the process save Java Virtual Machine average information so that Java Virtual Machine regeneration complete after continue
Use the average information.Compared with prior art, Java Virtual Machine is not out of service when carrying out software regeneration, and again
The average information saved during raw can continue to use after regeneration is completed, and thereby may be ensured that the performance of Java Virtual Machine
And the execution of java applet will not be stopped；Moreover, carrying out a point mould to method area, interpreter, compiler and exception processing module
It regenerates to block, regenerated speed can be improved, reduce the delay of java applet, guarantee the performance of Java Virtual Machine；It therefore, can be with
The reliability of Java Virtual Machine is promoted while guaranteeing Java Virtual Machine performance.
Optionally, in one embodiment of software regeneration method in Java Virtual Machine of the present invention, in Java Virtual Machine
It may include: to recorded in the table of loading classes (loaded class table) in the method area that method area, which carries out regeneration,
Class reloaded, original class in the table of loading classes is covered in same position, wherein described to have loaded
Record has the title of all classes loaded in class table.It is thus possible to eliminate the mistake that may be hidden in original method area.Its
In, the same position refers to having there is same names in the position and the table of loading classes of the class after reloading
The position of the class of load is identical.
During the loading process, Java Virtual Machine can again be loaded class file, connects, initialize.Therefore, even if
There are bit flippings in class file, also mistake can be found in load phase, to guarantee that the data being loaded onto memory are correct.
In each regenerative operation, the class of predetermined quantity in method Qu Zhongyi loading classes table can be reloaded,
Namely all classes in the table of loading classes are loaded in batches, without reloading institute in primary recycling operates
Some classes, so as to reduce the downtime of java applet.It optionally, can be in method area in each regenerative operation
10 classes in loading classes table are reloaded.
Further, in order to safeguard the reliability of the loading classes table, prevent soft error occur in the loading classes table
It accidentally, can be by way of adding check code, in each data read in the loading classes table, to the loading classes
Table is verified, and is found and is corrected the bit flipping occurred in the loading classes table.
Optionally, in one embodiment of software regeneration method in Java Virtual Machine of the present invention, in Java Virtual Machine
It may include: to the corresponding local code of every Java bytecode in the template table in the interpreter point that interpreter, which carries out regeneration,
It is not regenerated, the corresponding local code of Java bytecode each in original template table is covered respectively, wherein the mould
Record has the corresponding relationship of every Java bytecode and local code in plate table, interpreter when being executed, to explain Java one by one
The mode of bytecode executes local code corresponding to Java bytecode.
Template table be it is a kind of it is unrelated with operating status, primary generate, a table of continuously effective, be equivalent to constant.Therefore,
The corresponding local code of every Java bytecode in template table is regenerated respectively, so that template table is re-created, and
Original template table is covered, potential mistake in template table can be eliminated.
Further, regenerating to the interpreter in Java Virtual Machine can also include: to include one in interpreter
The codes such as a little Java stack frame creations, parameter transmitting, method return, local method call are re-created, and cover original generation
Code.
Optionally, in one embodiment of software regeneration method in Java Virtual Machine of the present invention, in Java Virtual Machine
It may include: in the compiled method table (compiled method table) in the compiler that compiler, which carries out regeneration,
The method recorded is recompilated, and covers original method in the compiled method table in same position,
In, record has the title of all compiled methods in the compiled method table, and the local code generated after method compiling is
Code is generated, the generation code is organized as unit of method.Wherein, the same position, after referring to recompility
Method position in the compiled method table have the position of compiled method of same names it is identical.
In each regenerative operation, can in the compiled method table in compiler predetermined quantity method carry out again
Compiling, namely all methods in the compiled method table are recompilated in batches, without being grasped in primary recycling
All methods are recompilated in work, so as to reduce the downtime of java applet.
Further, it in order to safeguard the reliability of the compiled method table, prevents from occurring in the compiled method table
Mistake can carry out error checking to the compiled method table when reading the method in the compiled method table every time,
It was found that and correcting the mistake occurred in the compiled method table.
Optionally, in one embodiment of software regeneration method in Java Virtual Machine of the present invention, in Java Virtual Machine
It may include: to the exception handling code in the abnormality code area in the exception processing module that exception processing module, which carries out regeneration,
It is regenerated, is covered the former exception handling code in the abnormality code area in identical address, wherein described different respectively
Record has all exception handling codes in normal code area.So as to cover potential mistake in original abnormality code area.It uses
Identical address may insure not needing to modify other codes, such as jump address.In addition, being conducive to again using identical address
The concurrently execution of raw thread and java applet.Wherein, the identical address refers to the exception handling code after regenerating
Address is identical as the address of former exception handling code in the abnormality code area.
In Java Virtual Machine, for these modules of method area, interpreter, compiler and exception processing module,
It is relatively independent between each other, there is good locality.Therefore Java Virtual Machine is during software regeneration, Ke Yifen
It carries out to module, does not need the regeneration for disposably completing all modules.
Further, for multi-core processor, method area, compiler, may be used also between exception processing module at interpreter
Concurrently to be regenerated, to help to reduce the reproduction time, regeneration handling capacity is promoted.
Further, equally there is good locality: group as unit of method area is by class in each inside modules
It knits, template table is organized as unit of bytecode, and generating code is organized as unit of method, and exception handling code is
It is organized as unit of code block.Therefore in the regenerative process of each module, further each module can be split into respectively
A small submodule, progress step by step, concurrently regenerate.By the fractionation and parallel execution of module, can be further improved
The performance of Java Virtual Machine hot recycling reduces the delay of java applet.
The embodiment of the present invention provides the software regeneration device in a kind of Java Virtual Machine, and Fig. 2 is Java Virtual Machine of the present invention
In software regeneration Installation practice one structural schematic diagram, as shown in Fig. 2, the device of the present embodiment includes:
Regeneration unit 11 is used in Java Virtual Machine operational process, respectively to the method area in Java Virtual Machine, explanation
At least one in device, compiler and exception processing module is periodically regenerated；
Storage unit 12, in method area, interpreter, compiler and the exception processing module in Java Virtual Machine
At least one of carry out periodically it is regenerated during, the average information of Java Virtual Machine is saved, so that Java Virtual Machine exists
Regeneration continues to use the average information after completing.
Software regeneration device in Java Virtual Machine provided in an embodiment of the present invention, in Java Virtual Machine operational process,
At least one in method area, interpreter, compiler and the exception processing module in Java Virtual Machine is carried out periodically respectively
Regeneration, and in the process save Java Virtual Machine average information so that Java Virtual Machine regeneration complete after continue
Use the average information.Compared with prior art, Java Virtual Machine is not out of service when carrying out software regeneration, and again
The average information saved during raw can continue to use after regeneration is completed, and thereby may be ensured that the performance of Java Virtual Machine
And the execution of java applet will not be stopped；Moreover, carrying out a point mould to method area, interpreter, compiler and exception processing module
It regenerates to block, regenerated speed can be improved, reduce the delay of java applet, guarantee the performance of Java Virtual Machine；It therefore, can be with
The reliability of Java Virtual Machine is promoted while guaranteeing Java Virtual Machine performance.
Optionally, in one embodiment of software regeneration device in Java Virtual Machine of the present invention, the regeneration unit 11 can
For being reloaded to class recorded in the table of loading classes in the method area, loaded in same position by described
Original class is covered in class table, wherein record has the title of all classes loaded in the table of loading classes.To,
The mistake that may be hidden in original method area can be eliminated.Wherein, above-mentioned same position refers to the position of the class after reloading
Set has the position of the class loaded of same names identical with the table of loading classes.
In each regenerative operation, the regeneration unit 11 can be to the class of predetermined quantity in method Qu Zhongyi loading classes table
It is reloaded, namely all classes in the table of loading classes is loaded in batches, without being grasped in primary recycling
All classes are reloaded in work, so as to reduce the downtime of java applet.Optionally, in each regenerative operation,
10 classes in method Qu Zhongyi loading classes table can be reloaded.
Further, in order to safeguard the reliability of the loading classes table, prevent soft error occur in the loading classes table
Accidentally, the regeneration unit 11 can by way of add check code, described in each read data in loading classes table when,
The table of loading classes is verified, find and corrects the bit flipping occurred in the loading classes table.
Optionally, in one embodiment of software regeneration device in Java Virtual Machine of the present invention, the regeneration unit 11 can
It, will be former for being regenerated respectively to the corresponding local code of every Java bytecode in the template table in the interpreter
The corresponding local code of each Java bytecode is covered respectively in template table, wherein record has every in the template table
The corresponding relationship of Java bytecode and local code.
Template table be it is a kind of it is unrelated with operating status, primary generate, a table of continuously effective, be equivalent to constant.Therefore,
The corresponding local code of every Java bytecode in template table is regenerated respectively, so that template table is re-created, and
Original template table is covered, potential mistake in template table can be eliminated.
Further, the regeneration unit 11 can also create some Java stack frames for including in interpreter, parameter passes
It passs, method return, the codes such as local method call are re-created, and cover original code.
Optionally, in one embodiment of software regeneration device in Java Virtual Machine of the present invention, the regeneration unit 11 can
It is described in same position general for being recompilated to method recorded in the compiled method table in the compiler
Original method is covered in Compilation Method table, wherein record has all compiled methods in the compiled method table
Title, to generate code, the generation code is organized as unit of method for the local code that generates after method compiling.Its
In, above-mentioned same position refers to thering is same names in the position and the compiled method table of the method after recompilating
Compiled method position it is identical.
In each regenerative operation, the regeneration unit 11 can be to predetermined quantity in the compiled method table in compiler
Method recompilated, namely all methods in the compiled method table are recompilated in batches, without
All methods are recompilated in primary recycling operation, so as to reduce the downtime of java applet.
Further, it in order to safeguard the reliability of the compiled method table, prevents from occurring in the compiled method table
Mistake, the regeneration unit 11 can be when reading the method in the compiled method table, to the compiled method every time
Table carries out error checking, finds and corrects the mistake occurred in the compiled method table.
Optionally, in one embodiment of software regeneration device in Java Virtual Machine of the present invention, the regeneration unit 11 can
For being regenerated respectively to the exception handling code in the abnormality code area in the exception processing module, in the same manner
Location covers the former exception handling code in the abnormality code area, wherein record has all exceptions in the abnormality code area
Handle code.So as to cover potential mistake in original abnormality code area.It may insure not needing using identical address
Modify other codes, such as jump address.In addition, being conducive to regenerate concurrently holding for thread and java applet using identical address
Row.Wherein, above-mentioned identical address refers in the address and the abnormality code area of the exception handling code after regenerating
The address of former exception handling code is identical.
Software regeneration method and device in Java Virtual Machine of the embodiment of the present invention, can be adapted in Java Virtual Machine
Software regeneration is carried out, but is not limited only to this.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in a computer-readable storage medium
In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (8)
1. the software regeneration method in a kind of Java Virtual Machine characterized by comprising
In Java Virtual Machine operational process, respectively to method area, interpreter, compiler and the abnormality processing in Java Virtual Machine
At least one in module is periodically regenerated；
Period is being carried out at least one in method area, interpreter, compiler and the exception processing module in Java Virtual Machine
Property it is regenerated during, save the average information of Java Virtual Machine so that Java Virtual Machine regeneration complete after continue to make
With the average information；
Wherein, carrying out regeneration to the method area in Java Virtual Machine includes: to be remembered in the table of loading classes in the method area
The class of record is reloaded, and is covered original class in the table of loading classes in same position, wherein described to have added
Carry the title that record in class table there are all classes loaded.
2. the method according to claim 1, wherein to the interpreter in Java Virtual Machine carry out regeneration include:
The corresponding local code of every Java bytecode in template table in the interpreter is regenerated respectively, by original template
The corresponding local code of each Java bytecode is covered respectively in table, wherein record has every Java word in the template table
Save the corresponding relationship of code and local code.
3. the method according to claim 1, wherein to the compiler in Java Virtual Machine carry out regeneration include:
Method recorded in compiled method table in the compiler is recompilated, same position will be described compiled
Original method is covered in method table, wherein record has the name of all compiled methods in the compiled method table
Claim.
4. the method according to claim 1, wherein being regenerated to the exception processing module in Java Virtual Machine
It include: to be regenerated respectively to the exception handling code in the abnormality code area in the exception processing module, identical
Address covers the former exception handling code in the abnormality code area, wherein there is all different record in the abnormality code area
Often processing code.
5. the software regeneration device in a kind of Java Virtual Machine characterized by comprising
Regeneration unit is used in Java Virtual Machine operational process, respectively to the method area in Java Virtual Machine, interpreter, volume
At least one translated in device and exception processing module is periodically regenerated；
Storage unit, in method area, interpreter, compiler and the exception processing module in Java Virtual Machine at least
One carry out periodically it is regenerated during, the average information of Java Virtual Machine is saved, so that Java Virtual Machine is regenerating
At continuing to use the average information later；
Wherein, the regeneration unit is also used to carry out class recorded in the table of loading classes in the method area to add again
It carries, covers original class in the table of loading classes in same position, wherein recorded in the table of loading classes
There is the title of the class loaded.
6. device according to claim 5, which is characterized in that the regeneration unit, for the mould in the interpreter
The corresponding local code of every Java bytecode is regenerated respectively in plate table, by Java bytecode pair each in original template table
The local code answered is covered respectively, wherein record has pair of every Java bytecode and local code in the template table
It should be related to.
7. device according to claim 5, which is characterized in that the regeneration unit, for in the compiler
Method recorded in Compilation Method table is recompilated, in same position by original method in the compiled method table
It is covered, wherein record has the title of all compiled methods in the compiled method table.
8. device according to claim 5, which is characterized in that the regeneration unit, for the exception processing module
In abnormality code area in exception handling code regenerated respectively, identical address will be in the abnormality code area
Former exception handling code covering, wherein record has all exception handling codes in the abnormality code area.
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|---|---|---|---|---|
| CN1305154A (en) * | 1999-11-17 | 2001-07-25 | 国际商业机器公司 | Method and system of transparent selective software regeneration based on time |
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| JPWO2010122709A1 (en) * | 2009-04-23 | 2012-10-25 | 日本電気株式会社 | Rejuvenation processing apparatus, rejuvenation processing system, computer program, and data processing method |
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|---|---|---|---|---|
| CN1305154A (en) * | 1999-11-17 | 2001-07-25 | 国际商业机器公司 | Method and system of transparent selective software regeneration based on time |
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