CN101833465A - Embedded system supporting dynamic loading operation of application programs - Google Patents
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Abstract
The invention relates to an embedded system supporting dynamic loading operation of application programs. The system comprises a frame management module, an application execution engine module, a basic functional unit library module and an API module, wherein the API module, the application execution engine module and the basic functional unit library module are orderly arranged from top to bottom; the frame management module is the core management unit and used for implementing the unified management and dispatching on the terminal software and hardware resources; the frame management module is used for providing a system resource acquisition and release interface for the loaded application program, thereby implementing the unified management and dispatching on the system software and hardware resources; the basic functional unit library module is used for being called by other units or application execution engine; and the basic functional unit is distributed onto the terminal accessible server, so that the frame management module can remotely load the basic functional unit according to user needs when the terminal operates. The embedded system of the invention also comprises a multilevel security management module which comprises process management submodules at three levels.
Description
Technical field
The present invention relates to the embedded system field, particularly a kind of embedded system of support application program dynamic load operating.
Background technology
Develop rapidly along with the communication technology, telecommunications network, computer internet, Cable Network present multi-level fusion characteristics day by day, " integration of three networks " becomes the inevitable outcome of development communication technologies, the national policy aspect has also given great attention, is that the informationalized grand strategy of national development is disposed.The development of " integration of three networks ", for present domestic operator provides strong support to development to the comprehensive operator of full-service, and can the core of operator's competition be provide diversified, abundant application service product to the user.Diversified and abundant application need playing an active part in and creating from the maximum magnitude service provider's, and is not only the work of small number of service provider or operator oneself.Terminal is controlled and display device as direct user oriented business, it is the final operation carrier of service application, operator wishes can be by attracting the constantly quick new valued added applications of develop and field of more third party's application developers, this just need realize quick exploitation, deployment, the operation of terminal traffic technically, the threshold that reduces professional design and insert operation.
Present traditional built-in terminal service application developing operation adopts the integrated mode of client more, after business application is finished by application developer's exploitation, transfer to the terminal development personnel with the form in client software storehouse and carry out software transplanting, application program is integrated in the whole software systems of built-in terminal platform, by the whole software upgrading of large-scale terminal, realize this professional terminal deployment operation again.This kind application and development mode, there are many limiting factors in the introducing for the abundant and business development merchant of service application:
1, applicating developing technology threshold height, the construction cycle is long.
Built-in terminal is varied at present, there are differences in each side such as master chip type, resource distribution, OS Type, software architectures, application and development is integrated in the terminal software system because of the mode of taking to transplant, need the software architecture familiar with understanding of application developer to terminal, this has proposed higher technical need to using exploitation.And in the migration process, the technology between terminal development personnel and application developer is linked up break-in, certainly will cause the lengthening in application and development cycle, can't realize professional quick exploitation deployment.
2, use the built-in mode of employing, resource distribution brings challenges to built-in terminal.
Application program is embedded in the whole software systems of built-in terminal with client software storehouse form, when the application and development fast development, when number of applications is greatly enriched, certainly will produce huge challenge to the terminal resource configuration, cause the continuous upgrading of terminal hardware platform, make operator's overlapping investment repeatedly, the overlapping investment of terminal development merchant technology, and the investment of disperseing the new business application and development.
3, service application new technological process complexity more, maintenance cost is high.
New exploitation of using is disposed, and needs the participation of each link of industrial chain such as application developer, terminal development personnel, terminal manufacturer, operator, and flow process is numerous and diverse, certainly will cause maintenance cost high.And the renewal of certain application needs the large-scale consumer terminal software upgrading, brings the operation risk to improve.
At the greatly abundant demand of service application, problem at existing application and development, be badly in need of making up a kind of with application development and the isolation of built-in terminal platform, and support application program dynamic load, operation have a perfect life cycle management, be fit to the basic software framework that embedded system is used, for quick exploitation, deployment, download, the operation of service application provides technical support.
Summary of the invention
The objective of the invention is to, for overcoming the applicating developing technology threshold height of prior art, construction cycle is long, use the built-in mode that adopts, the very high and service application new technological process complexity more to the built-in terminal resource allocation request, shortcomings such as maintenance cost is high, thus a kind of embedded system of support application program dynamic load operating is proposed.
In view of business is developed deployment requirements and built-in terminal diversity characteristics fast, the invention provides a kind of built-in terminal basic software framework of opening of support application program dynamic load operating, this framework is an open terminal-based software platform towards built-in terminal application and development and dynamic load operating.This software platform can provide the development environment of hardware independent for application developers, the dynamic discovery, loading and the management function that possess application, and software and hardware resources that can the integrated terminal system provides running environment for application, and the operation of using for the third party provides task management and resource management function.
The embedded system of a kind of support application program dynamic load operating that the present invention proposes, this system comprises: engine modules, basic function Component Gallery module and API module are carried out in framework administration module, application, wherein, from top to bottom be followed successively by: engine modules and basic function Component Gallery module are carried out in API module, application;
Engine modules is carried out in described application: be used to explain application development language, for application program provides the dynamic operation environment;
Described API module: be used to provide the routine interface of programming, and adopt open api interface;
It is characterized in that,
Described framework administration module is the hard core control unit, the unified management that is used to implement the terminal software and hardware resources is dispatched, be responsible for the management and dispatching of the application program that application execution engine modules, basic function Component Gallery module and API module are loaded in the embedded system, this framework administration module is used to application providing system resource acquisition and the realizing interface that is loaded, and realizes system's soft or hard resource unified management and scheduling;
Wherein, described framework administration module to N application program of operation simultaneously, can dynamically distribute M application execution engine instance make an explanation execution, wherein 1＜=M＜=N;
Described basic function Component Gallery module is used for carrying out engine calling for other assemblies or application, the basic function assembly is distributed on the server of terminal could access, carries out long-range loading by described framework administration module according to user's needs during terminal operating.
Technique scheme, described Governance framework module comprises: initialization unit, be used for when system boot, setting up the male parent process of carrying out engine, when needs are created new execution engine,, can finish the initialization of new execution engine instance from this male parent process creation subprocess; And
Optimized distribution and scheduling unit, be used for application programs and explain that carrying out engine is optimized distribution, provide the application code that enters embedded system and the optimized distribution of required execution engine number, the application program that this optimized distribution unit is an embedded system is set up priority, scheduling unit provides a kind of preemptible resource access control strategy according to priority, this strategy is: carry out engine instance for one and can carry out a plurality of application codes, each application code takies separate thread; When new application code need be carried out, system was that from current execution engine instance it selects suitable execution engine, and guaranteed can not cause after new application code adds between the application code on this execution engine resource contention takes place; If there is not suitable execution engine in the current system, system sets up new execution engine instance for it; Carry out the new thread of engine start and explain and carry out this application code, and provide the incident forwarding mechanism for each application code.
Technique scheme, described basic function Component Gallery comprises: the distributed management unit, be used for each the basic function assembly that is distributed in the webserver is carried out distributed management, comprise:
Infrastructure component is set up subelement, is used for the developer to the basic function assembly exploitation basic function assembly towards specific embedded system, and sets up descriptor for assembly;
Checking issue subelement is used for developer and operator and unites functional module newly developed is carried out qualified checking, by after be published to basic function assembly publisher server; And
Assembly distribution subelement, according to the demand of application program, check whether the assembly module of terminal this locality has when being used for the framework administration module and starting application program, the assembly module that does not have for this locality to Component Gallery, by the mode of network download, download the required component module from the assembly publisher server.
Technique scheme, engine is carried out in described application: the lower floor that runs on the API module, the upper strata of basic function Component Gallery, it is the interpretation process unit that comprises the application program of Java, the exploitation of JavaScript interpretative code, for application program provides the dynamic operation environment, by framework management module schedules, realize the dynamic explanation operation of application program.Described API module: offer the routine interface that the application developer programmes, interface architecture is carried out on the engine in explaining, can be explained and carry out the engine dissection process; The application program that adopts the opening API interface to generate, be published on the addressable application server of built-in terminal with certain mechanism, can be when built-in terminal moves, found and dynamic download by the framework administration module, further under the administration module scheduling, be loaded into the execution engine and move, and do not need application program is integrated in the software systems of built-in terminal with transplanting mode.
As an improvement of the present invention, described embedded system also comprises: the hierarchy system safety management module, be used for that engine modules, basic function Component Gallery module and API module are carried out in framework administration module, application and carry out stagewise condition monitoring and maintenance, specifically adopt three grades of management of process submodules.
Described three grades of management of process submodules also comprise:
The first management of process unit, be used for behind os starting, starting first generation process, this process unit is used to start managing process, and by and managing process between heartbeat message Real-time Monitor Management state of a process, when managing process takes place it to be carried out recovery operation when unusual;
Second generation management of process unit is used to realize the correlation function of Governance framework, is responsible for starting application process, Distribution Events, and monitor the application process state in real time; And
Third generation management of process unit is the JVM process unit, is used for being responsible for starting The Application of Thread and the distribution of secondary incident.
Technique scheme, described Governance framework module are responsible for application code and the scheduling of carrying out engine, and concrete steps are:
(1) based on the process duplication technology of operating system, when system boot, sets up the male parent process of carrying out engine, when needs are created new execution engine,, can finish the initialization of new execution engine instance from this male parent process creation subprocess;
(2) application programs and explain to carry out engine and be optimized distribution provides a kind of to the application code that enters this built-in terminal basic software framework and the optimized distribution method of required execution engine number.
Wherein, described optimized distribution method, concrete steps are as follows:
5-1) an execution engine instance can be carried out a plurality of application codes, and each application code takies separate thread;
When 5-2) new application code need be carried out, system was that it selects suitable execution engine from current execution engine instance, and guaranteed can not cause after new application code adds between the application code on this execution engine resource contention takes place;
If 5-3) do not have suitable execution engine in the current system, system sets up new execution engine instance for it;
Carry out the new thread of engine start and explain and carry out this application code, and provide the incident forwarding mechanism for each application code.
Technique scheme, described distributed management, assembly can be stored in remote web server, and the framework administration module needs according to the application program operation, downloads and load corresponding assembly to the local terminal from telecommunication network, and concrete steps are as follows:
(1) basic function assembly developer exploitation is towards the basic function assembly of specific embedded system, and sets up descriptor for assembly;
(2) developer and operator unite functional module newly developed are carried out qualified checking, by after be published to basic function assembly publisher server;
When (3) the framework administration module starts application program, according to the demand of application program, check whether the assembly module of terminal this locality has, the assembly module that does not have for this locality to Component Gallery, by the mode of network download, can download the required component module from the assembly publisher server.
Software frame proposed by the invention adopts the design of modularization open architecture, each composition module combines by the form of standard interface with loose coupling, the inner management module is removed the perfect management that possesses using, have simultaneously to framework self composition module as: basic function assembly, use the management function of carrying out engine, can realize but be not limited to life cycle managements such as functional module, the registration of carrying out engine, loading, renewal, unloading.Execution engine, functional module that other developers developed under the prerequisite that satisfies requirements such as interface, function, the method for operation, can receive in the software frame of the present invention by registration, the loading of administration module.The framework administration module is the hard core control unit of described software frame, enforcement is to the unified management scheduling of terminal software and hardware resources, the management and dispatching of each functional module and institute's loading application programs in the responsible framework: have lifecycle management function, process management such as the discovery that realization is used, download, loading, operation, unloading scheduling to institute's loading application programs; Have unified monitoring scheduling, guarantee the efficient utilization of resource and effectively avoid resource contention the terminal platform resource; Have customer incident distribution processor function,, finish user's incoming event and obtain and be distributed to corresponding application by safeguarding input equipment action listeners such as telepilot; Management function with software frame self assembly can realize carrying out the life cycle management such as registration, loading, renewal, unloading of engine, functional module etc.; Have the monitoring and the maintenance function of system state, real-time detecting system is unusual, and carries out recovery operation.
The invention has the advantages that, by the terminal platform resource, ability is abstract and explain to carry out engine optimization, application program and terminal platform are isolated, and by the framework administration module, realize discovery, download, loading, operation, the unloading lifecycle management of application program, make application and development need not to be concerned about the terminal platform ins and outs, and abundant terminal applies resource is provided, for quick exploitation, deployment, download and the operation of application program provides technical support, has good practical value.
Description of drawings
The condition monitoring mechanism figure of Fig. 1 system;
Fig. 2 embedded system structure figure of the present invention;
Fig. 3 is that framework administration module of the present invention constitutes synoptic diagram;
Fig. 4 is based on the incident distribution procedure synoptic diagram of software frame of the present invention.
Embodiment
For making technical scheme of the present invention more clear, below in conjunction with accompanying drawing the present invention is done further to elaborate.The present invention proposes a kind of built-in terminal basic software framework of support application program dynamic load operating, this software frame runs in the built-in terminal platform, by the graft layers interface, isolate with platform related softwares such as the driving of terminal bottom, operating systems, can be integrated in the different built-in terminal platforms.This software frame is mainly carried out engine, API module and framework administration module by basic function Component Gallery, application and is constituted.Accompanying drawing 1 is the condition monitoring mechanism figure of system;
Each module is isolated by the graft layers interface of standard and the bottom software of terminal platform in the built-in terminal basic software framework provided by the present invention, and portable is integrated into different built-in terminal platforms, as shown in Figure 2.
Software frame proposed by the invention as shown in Figure 2, is made up of Governance framework, application execution engine, basic function Component Gallery, API module at least, wherein:
1) the unified management scheduling to the terminal software and hardware resources is implemented in the described framework administration module hard core control unit that is software frame, is responsible for the management and dispatching of each functional module and institute's loading application programs in the framework.Have and use function sub-modules such as finding download, application management, application schedules, incident distribution, resource management, frame assembly management, application execution engine scheduling.Use the life cycle management of finding to download before submodule is responsible for the application program operation: discovery, download, loading and the unloading operation of management application program; The application management submodule is in charge of the application program that downloads to terminal platform, realize loading, the unloading of application program, after application program is downloaded, be stored under the terminal platform particular category with document form, be convenient management, each application program adopts independently catalogue, and the application management submodule is safeguarded the tabulation of a down load application program information, corresponding application program of each description entry in the tabulation, the loading of application program and unloading correspond to the interpolation and the deletion of list items; Life cycle management when the application schedules submodule is responsible for the operation of application program, and unified Application Status control interface is provided; Incident distribution submodule is responsible for the distribution management of incoming event to each application program; The resource management submodule provides unified resource access interface for application program and other modules; The assembly management submodule adopts distributed management to the assembly of basic function Component Gallery, can dynamically find and the loading associated component from telecommunication network according to user's needs, realizes a kind of distributed assembly management method, and the assembly of local prestrain is safeguarded; Using and carrying out the engine scheduling submodule is that the application program that enters running environment is selected existing execution engine instance or created new execution engine.
2) using the explanation of carrying out engine realization application program and carry out, is the interpretation process unit of application program, for application program provides the dynamic operation environment, realizes the dynamic explanation operation of application program; The described explanation of software frame of the present invention is carried out engine and is implemented in fully on basic function Component Gallery and the terminal platform graft layers interface, by the software and hardware resources ability of interface interchange terminal;
3) the basic function Component Gallery is the set of terminal resource ability, and at application demand, each assembly all has relatively independent function; In this software frame, also realize the combination function Component Gallery with nation method, the assembly in the combination function Component Gallery is by calling the standalone feature component interface, and a plurality of functions are integrated together with the standard interface form provides the execution engine calling; The basic function Component Gallery supports for the terminal applies exploitation provides required function, improves code reuse efficient, reduces the application and development difficulty; The basic function assembly module also provides the nation method support for third party's development interface, carries out efficient by using the local method call mechanism raising application of carrying out engine; The basic function assembly provides function relevant api interface, for other assemblies or execution engine calling;
The API module provides DLL (dynamic link library) for the application developer, and the API module construction is carried out on the engine in using, and can be employed and carry out the engine dissection process; The application program that adopts the opening API interface to generate, be published to certain mechanism on the application server of terminal could access, and by discovery of terminal framework administration module and dynamic load execution, and do not need to be integrated into application program in the software systems of built-in terminal with transplanting mode; The API module combines with explaining the execution engine, utilizes the local method call mechanism of carrying out engine of using, and carries out the interface expansion by expansion API assembly and corresponding basic function assembly; The API module adopts explains effective language, thereby the development approach of hardware independent is provided for application developer.
The hard core control unit that framework administration module of the present invention is the whole software framework, the management and dispatching of each functional module and institute's loading application programs in the responsible framework.Have and use function sub-modules such as finding download, application management, application schedules, incident distribution, resource management, frame assembly management.It constitutes as shown in Figure 3:
(1) wherein, use discovery and the download function of finding that the new issue of download submodule realization is used.The deployment of using is found to adopt following method: the Web based on the B/S framework disposes discover method and disposes discover method based on the message announcement of C/S framework, but is not limited to this two kinds of methods.Employing is based on the application deployment discover method of Web, application server is presented to the terminal user with the application program that will issue with the form of webpage, use to find download submodule by the termination function Component Gallery browser component access application publishing web page and present to the user, select to wish that by the user application start of downloading downloads.And based on the application deployment discover method of message announcement, keep a network linking between application server and the built-in terminal, after new application is registered to application server, server links to current online built-in terminal transmission by this and passes through information, and basis released news and user's operation start application download after terminal was received information.Use to download and can adopt general download protocol, as FTP, HTTP, TFTP etc. also can adopt privately owned download protocol.If adopt general download protocol, terminal is applied and directly calls corresponding downloader down load application behind download protocol and the download path; If employing proprietary protocol, terminal are at first downloaded the proprietary protocol downloader according to prompting download, start proprietary protocol downloader down load application then; Application program after the download is stored in assigned catalogue.
The application program of being issued not only comprises the JAVA syllabified code, but packs in the mode of " application program+application is described ", and complete application package can have but be not limited to following information:
1) the needed all kinds of auxiliary data file of application program and program run;
2) use to describe, can adopt the xml document form, wherein integrated detailed description information about using.
3) use picture resource such as placard, to guarantee to use the attractive in appearance of displaying;
(2) wherein, the application management submodule is in charge of the application program that downloads to terminal platform, realizes loading, the deletion of application program.Application program is stored under the terminal platform particular category with document form after downloading, and is convenient management, and each application program can adopt an independently catalogue.The application management submodule is safeguarded the listing file of a down load application program information, corresponding application program of each description entry in the listing file, and description entry includes but not limited to following information:
| The description entry title | Explanation | Data type | Whether essential |
| ??SERVICE?ID | Use ID, should application of unique identification | ??int | ??M |
| ??SERVICE?TYPE | Application type, four bytes, first byte are used for sign and use execution type (JAVA or JS are defaulted as JAVA) | ??int | ??O |
| ??SERVICE?NAME | The title of using | ??string | ??M |
| ??SERVICE?PATH | The path of using | ??string | ??M |
| ??DESCRIPTION | The description of using | ??String | ??O |
The application management submodule is realized the management to the down load application program by the Operation and Maintenance to listing file.
(3) wherein, the application schedules submodule is realized the load and execution scheduling and the ALM function of application program:
A) the application schedules submodule is safeguarded a task scheduling request list (TRL) and a task scheduling managing listings (TML), and when the user operated the request of triggering application start, application request was to list item of TRL registration; The application schedules submodule is monitored the TRL state in real time, in case TRL is not empty, then takes out the list item among the TRL, starts the application corresponding process according to contents in table, and application process information is added TML;
B) the application schedules submodule provides an application life cycles dispatch interface, and application program and other modules can change the state of application-specific by this interface; Application program operation the time have ready, movable, suspend, four kinds of states of destruction, the application schedules submodule provides loading, startup, time-out and four functional interfaces of destruction of application program, and supervisory routine and other modules all can be by the run time behaviour of these interface control related applications;
C) each user capture characteristic of using of application schedules submodule statistics is dynamically set up priority according to the user capture attention rate for each application;
D) the application schedules submodule is monitored the state of each application process in real time, in case find to have application process to take place unusual or withdraw from, then stops the abnormal process that do not withdraw from by force, and from TML the corresponding list item of deletion.
(4) wherein, incident distribution submodule is responsible for the unified user operation case of catching, and adopts based on the mode of interprocess communication and carry out the incident distribution.Need the application process of monitoring incident to register, be distributed to each application process that registered events is monitored after the submodule capturing events to incident distribution submodule.Pipe communication mechanism is adopted in incident distribution, and the action listener registry node comprises application process number and the required descriptor information that writes of transmission incident.During application program launching, incident distribution submodule is set up the action listener registry entry for this application program, and registration table is monitored in adding, and incident distribution this moment submodule passes to this program process after the operation information that captures can being shone upon through incident; When application program entered running background, incident distribution submodule was provided with Shield Flag with the action listener registry entry of application program correspondence, and incident distribution this moment submodule can be to this application process Distribution Events; When application program forwards front stage operation to from the backstage, its action listener registry entry Shield Flag is resetted; When application program withdraws from, delete its action listener registry entry.Distribution procedure as shown in Figure 4.
(5) wherein, the resource management submodule is realized unified management and the distribution to the embedded system software and hardware resources; The main resource that resource management module is in charge of has: internal memory, realize the unified management of Memory Allocation, should be able to avoid because of the internal memory application too much cause unusual; Platform such as demoder and demodulation multiplexer related resource.Need during application program launching to carry out resource bid to the resource management submodule, to check that whether current terminal idling-resource satisfies the condition of using operation, so is divided three classes terminal resource: distributed the resource of use, the resource that is about to be used, idling-resource.The resource management submodule provides unified resource access interface, must finish by this interface when application program and other module accesses resources, so this module can detect all resource contentions: promptly use and want accessed resources to be taken by other application programs at once.The application precedence information and the application state dispatch interface that utilize the application schedules submodule to provide carry out the control of preemptible resource access.
(6) wherein, the frame assembly administration module is responsible for the management that basic software framework self explain to be carried out modules such as engine, each functional module, can realize but is not limited to life cycle managements such as functional module, the registration of carrying out engine, loading, renewal, unloading.Execution engine, functional module that other developers developed under the prerequisite that satisfies requirements such as interface, function, the method for operation, can receive in the software frame of the present invention by registration, the loading of administration module.Guarantee the open characteristic of software frame.
(7) wherein, the system monitoring submodule is responsible for the monitoring management state of a process, this module starts a monitoring process when system start-up, set up one-period between monitoring process and the managing process and be 1 second heartbeat message, message can adopt message queue to realize, and also can adopt TCP to connect and set up, thus the monitoring management running state of a process, and to take place at managing process be to recover to handle unusually, and concrete steps are:
A) os starting monitoring process;
B) monitoring process starts managing process, and sets up heartbeat mechanism in managing process, and managing process was reported state every 1 second to monitoring process;
C) managing process starts the engine instance process of carrying out, and the engine instance of monitoring execution in real time state of a process signal, when finding that it carries out the respective resources cleaning work when withdrawing from;
D) carry out the engine instance process and set up new thread for each application, and a monitoring The Application of Thread state;
(8) wherein, Governance framework provides one to use execution engine scheduling submodule, explain that with application program carrying out engine combines, providing required execution engine number to the N that must move a simultaneously application program that enters this software frame is the optimum allocation of M, 1＜=M＜=N wherein realizes the operation dispatching of application program; Concrete grammar and step are as follows:
E) carry out engine for each and set up an idling-resource tabulation, its idling-resource tabulation is S during initialization just;
F) the required the Resources list of each application program is s, supposes that existing application code k is individual on j the execution engine, and then its idling-resource tabulation is Sj=S-s1-s2-...-sk, and wherein si is wherein i application program resource needed tabulation;
G) when new application program enters running environment, suppose that its resource requirement tabulation is sn, selects the idling-resource tabulation to comprise the available execution Engine Listing L that sets up of sn from current execution engine;
H) if L is empty, the engine-operated new application program of new execution of initialization then, otherwise from L, select executions engine-operated, this executions engine idling-resource is tabulated and is deducted minimum behind the sn.
Carry out the initialization of engine and adopt the process duplication technology of operating system to shorten start delay, concrete grammar and step are as follows:
A) start an execution engine male parent process during system start-up
B) when needing the new execution engine of initialization, Governance framework notice male parent process is set up subprocess, and the subprocess relevant information is reported to Governance framework, and Governance framework is communicated by letter with this subprocess, makes the new thread of its startup move related application
(9) assembly to the basic function Component Gallery adopts distributed management, can dynamically find and the loading associated component that from telecommunication network realize a kind of distributed assembly management method, concrete steps are as follows according to user's needs:
A) assembly developer exploitation is towards the basic function assembly of particular terminal, and sets up descriptor for assembly;
B) developer and operator unite functional module newly developed are tested, test by after be published to basic function assembly publisher server;
The execution of discovery procedure needed one group of basic function assembly (k) SC{sc1 when c) Governance framework started application program, sc2 ..., the support of sck}, and find local part assembly (m) SC ' { sc1, the sc2 that has had wherein, ..., scm}, wherein m is not less than zero and is not more than k; If k equals m, enter step 5, otherwise enter step 4;
D) Governance framework is carried out from the program of basic function assembly publisher server down load application needs and assembly that other this locality that local basic function assembly SC-SC ' and these assembly operatings that does not have relied on do not have;
E) start application program.
Wherein, comprise software and hardware specification and dependence thereof that assembly is suitable in the basic function component description information, the dependence of framework management and utilization assembly and software and hardware specification are the selected assembly bag that needs download of particular terminal; Adopt standard download agreements such as HTTP, FTP to carry out the download of component description information and assembly itself between Governance framework and the infrastructure component publisher server;
At distributed component management meeting network delay is incorporated into the start delay of application program, Governance framework carries out the prestrain strategy to assembly, can adopt but is not limited to following two kinds of schemes:
1) based on the assembly prestrain strategy of user's attention rate: can use the associated component in API module and the basic function Component Gallery to realize its function during each application program operation, the higher application of user's attention rate is bigger by the probability that the user uses, so the invoked probability of its used assembly Shanghai Communications University, this method is taken all factors into consideration attention rate and the terminal storage ability of user to using, needed API assembly of the application that user's attention rate is higher and basic function assembly are pre-loaded to the local storage of terminal, thereby the expected delay when shortening user starts application improves user experience.
2) based on the assembly prestrain strategy of assembly laws of use: the specific user is in using the terminal applies process, can count API assembly commonly used and basic function assembly, according to frequency of utilization is to sort, with top n API assembly and basic function assembly be loaded into local storage.
Termination function Component Gallery of the present invention is on built-in terminal platform resource, the reasonable abstract basis of ability, and specific aim is combined to form satisfies the application and development demand and possess the assembly set of dynamic expansion ability.Compiling effective languages such as C/C++ are adopted in the exploitation of functional module, guarantee the execution efficient in storehouse.Form with static library or dynamic link library is integrated in the basic software framework, provides with the standard interface form and explains the execution engine calling.At the built-in terminal application demand, the typical functions assembly is exemplified below:
(1) browser: support standard HTML, JS webpage to resolve, support for B/S framework bidirectional applications provides function;
(2) media player: support the decodes and plays of multi-format audio-video frequency media file, stream data etc., for application provides the media function;
(3) network application protocol stack: at application demand, the extended network protocol stack of being developed based on the built-in TCP/UDP/IP computer network with standard network protocol stack of operating system, as: RTP, SIP, FTP etc.
It is the interpretation process unit of application program that engine is carried out in explanation of the present invention, and for application program provides the dynamic operation environment, it is JAVA virtual machine (JVM) that engine is carried out in typical explanation, and corresponding application adopts explains effective language JAVA exploitation.JAVA is a kind of standard open program language by the issue of SUN company, its source program is compiled as bytecode (Bytecode), the machine instruction that is interpreted as platform specific by JVM is carried out, thereby application program and concrete terminal platform are isolated, and can be when terminal operating, by JVM dynamic load operating JAVA application program.The application program-oriented method exploitation, the JAVA class libraries bag and the open api interface of standard are provided, simultaneously at terminal platform functions peculiar Component Gallery resource, software frame expansion JAVA class libraries bag, and provide the api interface supply of expansion to use with program development, by calling of expansion interface, the addressable functional module base resource of application program.
It should be noted last that 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 embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is made amendment or is equal to replacement, do not break away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1. the embedded system of a support application program dynamic load operating, this system comprises: engine modules, basic function Component Gallery module and API module are carried out in framework administration module, application, wherein, from top to bottom be followed successively by: engine modules and basic function Component Gallery module are carried out in API module, application;
Engine modules is carried out in described application: be used to explain application development language, for application program provides the dynamic operation environment;
Described API module: be used to provide the routine interface of programming, and adopt open api interface;
It is characterized in that,
Described framework administration module is the hard core control unit, the unified management that is used to implement the terminal software and hardware resources is dispatched, be responsible for the management and dispatching of the application program that application execution engine modules, basic function Component Gallery module and API module are loaded in the embedded system, this framework administration module is used to application providing system resource acquisition and the realizing interface that is loaded, and realizes system's soft or hard resource unified management and scheduling;
Wherein, described framework administration module to N application program of operation simultaneously, can dynamically distribute M application execution engine instance make an explanation execution, wherein 1＜=M＜=N;
Described basic function Component Gallery module is used for carrying out engine calling for other assemblies or application, the basic function assembly is distributed on the server of terminal could access, carries out long-range loading by described framework administration module according to user's needs during terminal operating.
2. the embedded system of support application program dynamic load operating according to claim 1 is characterized in that, described API module: offer the routine interface that the application developer programmes, explained and carry out the engine dissection process; The application program that adopts the opening API interface to generate, be published on the addressable application server of built-in terminal with certain mechanism, when built-in terminal moves, found and dynamic download by the framework administration module, further under framework management module schedules, be loaded into application execution engine and move.
3. the embedded system of support application program dynamic load operating according to claim 1, it is characterized in that, described Governance framework module, comprise: initialization unit, be used for when system boot, setting up the male parent process of carrying out engine, when needs are created new execution engine,, can finish the initialization of new execution engine instance from this male parent process creation subprocess; And
Optimized distribution and scheduling unit, be used for application programs and explain that carrying out engine is optimized distribution, provide the application code that enters embedded system and the optimized distribution of required execution engine number, the application program that this optimized distribution unit is an embedded system is set up priority, scheduling unit provides a kind of preemptible resource access control strategy according to priority, this strategy is: carry out engine instance for one and can carry out a plurality of application codes, each application code takies separate thread; When new application code need be carried out, system was that from current execution engine instance it selects suitable execution engine, and guaranteed can not cause after new application code adds between the application code on this execution engine resource contention takes place; If there is not suitable execution engine in the current system, system sets up new execution engine instance for it; Carry out the new thread of engine start and explain and carry out this application code, and provide the incident forwarding mechanism for each application code.
4. the embedded system of support application program dynamic load operating according to claim 1, it is characterized in that, described basic function Component Gallery comprises: the distributed management unit, be used for each the basic function assembly that is distributed in the webserver is carried out distributed management, and comprise:
Infrastructure component is set up subelement, is used for the developer to the basic function assembly exploitation basic function assembly towards specific embedded system, and sets up descriptor for assembly;
Checking issue subelement is used for developer and operator and unites functional module newly developed is carried out qualified checking, by after be published to basic function assembly publisher server; And
Assembly distribution subelement, according to the demand of application program, check whether the assembly module of terminal this locality has when being used for the framework administration module and starting application program, the assembly module that does not have for this locality to Component Gallery, by the mode of network download, download the required component module from the assembly publisher server.
5. the embedded system of support application program dynamic load operating according to claim 1, it is characterized in that, described embedded system also comprises: the hierarchy system safety management module, be used for that engine modules, basic function Component Gallery module and API module are carried out in framework administration module, application and carry out stagewise condition monitoring and maintenance, specifically adopt three grades of management of process submodules.
6. the embedded system of support application program dynamic load operating according to claim 5 is characterized in that, described three grades of management of process submodules also comprise:
The first management of process unit, be used for behind os starting, starting first generation process, this process unit is used to start managing process, and by and managing process between heartbeat message Real-time Monitor Management state of a process, when managing process takes place it to be carried out recovery operation when unusual;
Second generation management of process unit is used to realize the correlation function of Governance framework, is responsible for starting application process, Distribution Events, and monitor the application process state in real time; And
Third generation management of process unit is the JVM process unit, is used for being responsible for starting The Application of Thread and the distribution of secondary incident.
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