CN108363612A - The J2EE modules heat deployment and recalls information statistical method realized based on class loaders - Google Patents
The J2EE modules heat deployment and recalls information statistical method realized based on class loaders Download PDFInfo
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- CN108363612A CN108363612A CN201810185714.2A CN201810185714A CN108363612A CN 108363612 A CN108363612 A CN 108363612A CN 201810185714 A CN201810185714 A CN 201810185714A CN 108363612 A CN108363612 A CN 108363612A
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- module
- classloader
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- heat deployment
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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
- G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
- G06F9/45533—Hypervisors; Virtual machine monitors
- G06F9/45558—Hypervisor-specific management and integration aspects
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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
- G06F9/46—Multiprogramming arrangements
- G06F9/50—Allocation of resources, e.g. of the central processing unit [CPU]
- G06F9/5061—Partitioning or combining of resources
- G06F9/5077—Logical partitioning of resources; Management or configuration of virtualized resources
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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
- G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
- G06F9/45533—Hypervisors; Virtual machine monitors
- G06F9/45558—Hypervisor-specific management and integration aspects
- G06F2009/4557—Distribution of virtual machine instances; Migration and load balancing
Abstract
The invention discloses a kind of J2EE modules heat deployment realized based on class loaders and recalls information statistical methods, this process employs a series of key properties of java class loader, it is divided in conjunction with business module, by defining dynamic module manager, dynamic module, Classloader dynamic module configuration and customized, the statistics of the module heat deployment and module interface recalls information of J2EE projects is realized.This method realizes the heat deployment function of module, while the statistics of basic recalls information can be carried out for the interface provided in module based on from the class loaders for realizing Java.
Description
Technical field
The invention belongs to software technology fields, and class loaders are based on to be a kind of（ClassLoader）From realize J2EE
Module heat deployment and recalls information statistical method.
Based on the J2EE projects of this patent exploitation, heat deployment operation can be carried out on the business module of itself without influencing system
Normal use, and the relevant information that each modular approach calls can be counted.
Background technology
The heat deployment of Java（hotswap）, it inherently refers under the premise of not restarting Java virtual machines, it can be certainly
The behavior of class when moving the variation for detecting class files and updating operation.Reflect in Java projects to be exactly not need
Stop and reactivates java applet（The application of web server or Java）, it is only necessary to replace the resource of corresponding Java
（Jar packets etc.）, can be so that active program loads the original service logic of new resource changing.
Java itself is not support heat deployment characteristic, the virtual machine of acquiescence only can loading classes on startup, filled
The class carried, which is updated or replaces, to come into force.Therefore to realize the effect of heat deployment, can only detour utilize Java
Some other characteristics realize.
Java Agent mechanism：After JDK1.5, the agency mechanism of Java Agent is provided.
Instrumentaion classes（In the java.lang.instrument of standard jdk）Define redefineClasses and
RetranformClasses methods, to realize that the conversion of class is replaced with heat.Java Agent are specified by the start-up parameter of JVM
The proxy class of parameter setting adds class switching device interface when JVM starts by proxy class（ClassFileTransformer）'s
From realization, dynamically to change and replace class definition.This way can replace raw bytes code and prevent raw bytes code quilt
Virtual machine loads, and can see the AOP of JVM ranks as.Can more it not have to when JVM starts with regard to binding agent after JDK1.6, and
It is dynamically to carry out on Attach to Java Virtual Machine upon actuation.Open Framework spring-loaded is based on Java
Agent is realized, therefore it is only applicable to the project using 1.5 later JDK.
OSGI codes and standards：OSGI technologies are a series of specifications of Java mobilism modular systems, it may be considered that
It is the module layer of Java platform.It is supplied to one modular BOTTOM LAYER ENVIRONMENT of Java projects and a series of general services
(Service）.Due to the characteristics of layering of its frame and specification defines, and the program of OSGI innately possesses dynamic module.Different
Module (OSGI is referred to as Bundle) has independent life cycle, the behaviour can independently be installed, be started, stopped, being unloaded
Make, the dependence management of intermodule is also provided by OSGI.OSGI is suitble to need to carry out the project of assembly management, such as Eclipse and
Its plug-in unit.A series of common operations of OSGI standards also specifications, such as daily record, configuration file, event queue, Web exploitations, JPA＆
JDBC etc..The powerful and normalization of OSGI is indubitable, but its frame structure is complicated, be more suitable for complicated be for building
System, such as IDE, application server and application framework.For being the J2EE systems being oriented to business, learnt using OSGI frames and structure
The cost built can increase.
Class loaders ClassLoader：Java class is loaded by Java Virtual Machine, and the class files of some class exist
After being loaded by ClassLoader, corresponding Class objects can be generated, such example can be created later.That gives tacit consent to is virtual
Machine behavior only can replace merely the class files of compiling by loading classes if the later stage, there are one classes to need if updating on startup,
Java Virtual Machine is will not to update the Class objects being currently running.Here it is the basic originals that Java itself does not support heat deployment
Cause.From the point of view of loading the level of ClassLoader after virtual machine startup, JVM predefines three kinds of Classloaders from top to bottom：It opens
Dynamic Classloader（Bootstrap Class Loader）, standard extension Classloader（Extension Class Loader）With
And system Classloader（System Class Loader）.Wherein, developer can directly use standard class extension loader and
Two kinds of system Classloader also can customize the Classloader of semantically more next layer of realization（Referred to as User-Defined
Class Loader）It is set to be loaded by system Classloader.Howsoever encapsulation provide which kind of specification, most of product from certain
All it is that heat deployment function is realized by self defined class loader from meaning.
Self defined class loader realizes that the common way of heat deployment is：The class that customized class loaders will load every time
A Class with version information is saved as, for example load A.class saves as A_v1.class in memory, when class changes
Version changes the class name reloaded in memory（A_v2.class）, the class definition for generating object every time in this way can
There is variation.
Invention content
The object of the present invention is to provide a kind of J2EE modules heat deployment realized based on class loaders and recalls information statistics
Method, this method is based on the class loaders from realization Java（ClassLoader）, the heat deployment function of module is realized, simultaneously
The statistics of basic recalls information can be carried out for the interface provided in module.
The purpose of the present invention with technical solution by being realized：
A kind of J2EE modules heat deployment and recalls information statistical method based on class loaders realization, it is characterised in that：This method
A series of key properties of java class loader are utilized, are divided in conjunction with business module, by defining dynamic module manager, moving
Morphotype block, Classloader dynamic module configuration and customized realize the module heat deployment and module interface tune of J2EE projects
With the statistics of information.
The class loaders ClassLoader of Java has following several key properties：
Shared characteristic：This characteristic appoints mechanism derived from the parents of Java.When ClassLoader has inheritance, subclass loader
First search father's loader is may be configured as when being loaded into class.Therefore common non-module class can be loaded by father ClassLoader to reach
To the shared of sub- ClassLoader.
Isolation characteristic：Between not having the ClassLoader of inheritance, mutual code is considered as completely isolated
's.This characteristic ensure that the module of the ClassLoader based on no inheritance is independent of each other.
Loading features：Sub- ClassLoader as object can be again loaded by father ClassLoader.Old son
ClassLoader can be unloaded, i.e., when the related object of institute is all no longer cited in the sub- ClassLoader, JVM at this time
Garbage reclamation will be carried out to association Object and ClassLoader by being in due course.
Communication characteristic：The variable for instantiating out in sub- ClassLoader can save father's ClassLoader variables
In.Father ClassLoader cannot be accessed arbitrarily, can only pass through class reflection mechanism or be converted into father ClassLoader one
Class or interface access.
Based on the above characteristic, the present invention loads the different editions of same class to realize the basis of heat deployment in class loaders
On be changed, resolution is up promoted to a level, does not repartition the different editions of class, and is to discriminate between and is loaded with different versions
The class loaders object of this resource.Resource is divided with the principle of intermodule lower coupling according to business module, general realization side
Definition and realization of the Java modules heat deployment of formula just like lower component：
1. customizing Classloader（ConfigurableClassLoader）：For dynamically specifying ClassPath and specified lookup
Class sequence（Such as whether preferentially searching father classloader）, the loading mechanism of resource is realized again.
2. dynamic module（DynamicModule）：One dynamic module corresponds to a heat deployment unit（That is business module
Resource packet）.Which includes：Customize Classloader and dynamic module configurator.
3. dynamic module configurator（DynamicModuleCfg）：For the configuration of dynamic module, main includes as next
The description of a little information：The path etc. of module name, ClassPath, jar resource in deployment package.
4. dynamic module manager（CfgDynamicModuleMgr）：For the management of dynamic module, such as dynamic module
Addition, stop, reloading, while providing all external interfaces.
Consider that the multi-layer framework of J2EE, the present invention are designed following component is made after heat deployment and J2EE depth integrations：
Customize Classloader, dynamic module manager（It is configured containing dynamic module）, Bean container managers（BeanContainer）、MVC
Transponder（UriDispatcher）.As shown in Figure 1.
Customize the definition in Classloader, dynamic module, dynamic module manager, that is, general realization.Based on J2EE projects
Module heat deployment realize in, dynamic module also include MVC transponders and Bean container managers.Wherein MVC transponders are main
Controller classes, Bean containers mainly manage various Service and Dao classes in J2EE projects and between dependence.
URI mappings, the definition of various Bean, instantiation and the mutual dependence of MVC are realized in heat deployment program using note,
It is used for dynamic module.
URI due to realizing MVC by unified note maps, and can be write for heat deployment module in note
The interface of middle offer calls the logic for carrying out relevant information statistics, including：It is average that time-consuming, each call is called to be related to database language
Sentence executes number, calling error number etc..
The present invention realizes the heat deployment function of module, while can carry out basic call for the interface provided in module and believe
The statistics of breath.
Description of the drawings
Fig. 1 is component design structure schematic diagram in the present invention.
Fig. 2 is dynamic module registration and binding mechanism figure in the present invention.
Fig. 3 is that heat deployment module related urls and the sequence diagram of heat deployment are accessed in the present invention.
Specific implementation mode
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
A kind of J2EE modules heat deployment and recalls information statistical method based on class loaders realization, are utilized java class dress
A series of key properties for carrying device are divided in conjunction with business module, by defining dynamic module manager, dynamic module, dynamic analog
Block configures and the Classloader of customization, realizes the statistics of the module heat deployment and module interface recalls information of J2EE projects.
The class loaders ClassLoader of Java has following several key properties：Shared characteristic, isolation characteristic, loading features, communication special
Property.
Resource is divided with the principle of intermodule lower coupling according to business module, the Java module heat of general realization method
It is deployed with the definition and realization such as lower component：1, Classloader is customized（ConfigurableClassLoader）；2, dynamic module
（DynamicModule）；3, dynamic module configurator（DynamicModuleCfg）；4, dynamic module manager
（CfgDynamicModuleMgr）：For the management of dynamic module, as dynamic module addition, stop, reloading, simultaneously
All external interfaces are provided.
There are one overall dynamic module configuration files for heat deployment frame（It is denoted as modCfg.json）, to record J2EE
The configuration information of module relevant information and the inside modules scanning of project heat deployment.It can be there are two heat deployment module：Permission
Heat deployment module authMod and workload heat deployment module flowMod.Each heat deployment module can specified resource jar packets
Respective paths（classPaths）, resource packet title（jarResNames）, MVC transponder class names
（uriDispatcherClsName）Etc. in relevant configurations and resource packet URI intercept configuration, Bean scannings resource distribution,
Action scans the configuration of resource.
In J2EE project initiations, by dynamic module manager（CfgDynamicModuleMgr）Match according to dynamic module
Set file（modCfg.json）Each heat deployment module of configuration is instantiated and registered.Each heat during this
Deployment module can load preconfigured jar packets resource, and will regenerate object according to the Bean scanning configurations in module, together
When according to action scanning resource distribution generation module in MVC transponders（UriDispatcher）Object.This process is completed
Afterwards, the module of heat deployment externally provides service, and all respective requests for accessing heat deployment module will be intercepted by MVC transponders conciliates
It analyses while being included in recalls information statistics.
Fig. 2 simply illustrates dynamic module（DynamicModule）Registration and binding mechanism.When to dynamic module management
Device（CfgDynamicModuleMgr）When initiating the request of some module heat deployment, it is dynamic that dynamic module manager can regenerate this
Morphotype block.As when its process and initialization generate heat deployment dynamic module, the business module resource jar packets that only use
It is the jar packets newly uploaded.After new module generates, it will draw again to dynamic module manager, old dynamic module binding registration
With that will fail, the recalls information statistics that old dynamic module provides service will also be reset.
The simple operations interface of heat deployment, all dynamic modules（Including dynamic module manager UriDynModSetMgr sheets
Body）It is all enumerated in lists, each dynamic module can be chosen file, upload and heat deployment（Reload）Operation.Choosing
File is selected to select the jar packet resource files after a change, upload is that the resource file is reached to the specific mesh of server
Record, Reload operations are that the jar packet resources in particular category are reloaded, to achieve the effect that heat deployment.Due to
The garbage reclamation mechanism of Java, after what is generated before Reload operations will not be in Reload to the access of last revision dynamic module
It fails at once, but new object resource will be accessed by being accessed again after Reload operations.Due to the realization of the heat deployment be
Inside container, therefore heat deployment operation will not lead to the loss of user Session.
Click the prefix of heat deployment module in heat deployment operation interface（As workflow /workflow）, it can be seen that this is dynamic
The available service of morphotype block and the module service called statistical information after starting（Logic is real in the note that MVC is forwarded
It is existing）.
In Fig. 3, digital sequential illustrates the sequence diagram of request dynamic module URL, and alphabetical sequential then illustrates module
The sequence diagram of heat deployment.
Claims (2)
1. a kind of J2EE modules heat deployment realized based on class loaders and recalls information statistical method, it is characterised in that：The party
Method utilizes the key property of java class loader, is divided in conjunction with business module, by defining dynamic module manager, dynamic analog
Block, Classloader dynamic module configuration and customized realize the module heat deployment and module interface recalls information of J2EE projects
Statistics；The class loaders ClassLoader of the Java has following several key properties：
Shared characteristic：This characteristic appoints mechanism derived from the parents of Java；When ClassLoader has inheritance, subclass loader
It is set as first search father's loader when being loaded into class；Therefore common non-module class is loaded by father ClassLoader to reach son
ClassLoader's is shared；
Isolation characteristic：Between not having the ClassLoader of inheritance, mutual code, which is regarded as, to be entirely isolated；Ensure
The module of ClassLoader based on no inheritance is independent of each other；
Loading features：Sub- ClassLoader as object can be again loaded by father ClassLoader；Old son
ClassLoader can be unloaded, i.e., when the related object of institute is all no longer cited in the sub- ClassLoader, JVM at this time
Garbage reclamation will be carried out to association Object and ClassLoader by being in due course；
Communication characteristic：The variable for instantiating out in sub- ClassLoader is saved in father's ClassLoader variables；Father
ClassLoader cannot be accessed arbitrarily, by class reflection mechanism or a class being converted into father ClassLoader or can only be connect
It mouthful accesses.
2. the J2EE modules heat deployment according to claim 1 realized based on class loaders and recalls information statistical method,
It is characterized in that：The different editions of same class are loaded to be changed on the basis of realizing heat deployment in class loaders, will be known
Up one level of promotion is not spent, does not repartition the different editions of class, and is to discriminate between the class loading for being loaded with different editions resource
Device object；Resource is divided with the principle of intermodule lower coupling according to business module, the Java module heat of general realization method
It is deployed with the definition and realization such as lower component：
1）Customize Classloader：For dynamically specifying ClassPath and specified lookup class sequence, the load machine of resource is realized again
System；
2）Dynamic module：One dynamic module corresponds to a heat deployment unit；Which includes：Customize Classloader and dynamic analog
Block configurator；
3）Dynamic module configurator：For the configuration of dynamic module, include the description of the following information：Module name,
Path of ClassPath, jar resource in deployment package；
4）Dynamic module manager：For the management of dynamic module, including dynamic module addition, stop, reloading, simultaneously
All external interfaces are provided.
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| CN109144549A (en) * | 2018-08-29 | 2019-01-04 | 北京城市网邻信息技术有限公司 | Manage method, apparatus, equipment and the readable storage medium storing program for executing of external extended resources |
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| CN112035192A (en) * | 2020-09-02 | 2020-12-04 | 中国银行股份有限公司 | Java class file loading method and device supporting component hot deployment |
| CN112269638A (en) * | 2020-10-29 | 2021-01-26 | 苏州浪潮智能科技有限公司 | Virtual machine loading device, method and system for realizing interaction between server applications |
| CN115543546A (en) * | 2022-11-25 | 2022-12-30 | 金现代信息产业股份有限公司 | Spring-based module heat deployment method and system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109144549A (en) * | 2018-08-29 | 2019-01-04 | 北京城市网邻信息技术有限公司 | Manage method, apparatus, equipment and the readable storage medium storing program for executing of external extended resources |
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| CN112269638A (en) * | 2020-10-29 | 2021-01-26 | 苏州浪潮智能科技有限公司 | Virtual machine loading device, method and system for realizing interaction between server applications |
| CN112269638B (en) * | 2020-10-29 | 2022-06-03 | 苏州浪潮智能科技有限公司 | Virtual machine loading device, method and system for realizing interaction between server applications |
| CN115543546A (en) * | 2022-11-25 | 2022-12-30 | 金现代信息产业股份有限公司 | Spring-based module heat deployment method and system |
| CN115543546B (en) * | 2022-11-25 | 2023-06-23 | 金现代信息产业股份有限公司 | Spring-based module hot deployment method and system |
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Application publication date: 20180803 |