CN102314358A - Method for deploying conventional applications on cloud platform in SOA (service oriented architecture) way - Google Patents
Method for deploying conventional applications on cloud platform in SOA (service oriented architecture) way Download PDFInfo
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Abstract
The invention provides a method for deploying conventional applications on a cloud platform in an SOA (service oriented architecture) way. By using the method, developers can develop application systems in a cloud service mode without learning new knowledge, and also can deploy a large number of the existing application systems in the cloud platform. The method provided by the invention mainly comprises the following steps: using a system to analyze configuration files and source programs submitted by a user so as to acquire service classes configured by the user as well as generate corresponding WSDL (web services description language) files, and then generating corresponding Stub service calling codes, wherein the Stub service calling codes are used for providing service calling interfaces to the outside; then adding the Stub service calling codes to a source program packet, automatically updating client classes, and automatically updating codes which originally call the service classes into codes for calling Stub services; and finally deploying the applications and services respectively. By using the method, the efficiency of deploying the application systems on the cloud platform can be improved greatly, the development cost of new application systems is lowered, and the cost of transferring the existing systems to the cloud platform is simultaneously lowered.
Description
Technical field
The present invention relates to the Computer Applied Technology field, relate in particular to the content of aspect such as SOA and process analysis in the cloud platform.
Background technology
The core concept of cloud computing is computational resource unified management and the scheduling that connects with network in a large number, and constituting a computational resource pond provides on-demand service to user or application.Cloud computing puts together all computational resources, and realizes management automatically by software, need not artificial participation.It is loaded down with trivial details details worry that this feasible supplier of application need not, and can be absorbed in the business of oneself more, helps innovating and reducing cost.
The proposition of cloud computing though solved the not enough problem of single server performance, has also brought the communication issue between a plurality of computational resources, and SOA (Service Oriented Architecture) has solved this problem to a great extent.SOA is one type of architecture of distributed system; This type systematic is that the difference in functionality parts of application program on the heterogeneous platform (being called service) are combined by the loose coupling mode through definition excellent interface and standard between these services, is about to a plurality of existing application softwares and through network it is integrated into a new system.
Cloud computing provides powerful computing ability, and SOA realizes the scheduling between a plurality of resources.Adopt the cloud computing platform of Service-Oriented Architecture Based to integrate this dual mode, have numerous advantages, as: realize the integration of great amount of calculation resource, highlight the powerful calculating ability of cloud computing.With delivery of services, be deployed on the different servers, thereby realize the load balancing of service dispatch and the parallel utilization of computational resource.Cloud computing platform can integrated in advance numerous cloud services, make things convenient for the exploitation of application system.Service development separates with application system development, and loose coupling between the feasible part that needs the developer to be concerned about is mutual has solved on the one hand and linked up difficult problem between the project personnel, has also simplified developer's task on the other hand, has improved production efficiency.
Summary of the invention
Relatedly among the present invention on cloud computing platform, dispose the conventional method and system of using, solved a large amount of existed systems (perhaps the application system of exploitation) in a conventional manner to problems based on the cloud computing platform smooth migration of SOA with the mode of SOA.It has comprised the implication of the following aspects:
At first, the user disposes source program and configuration file, has write down in the source program which type in the configuration file and will move with service manner, is called service class, and its class that is not included in the configuration file is called customer class.System reads configuration file, and in internal memory, generates corresponding service class tabulation.
Secondly; System upgrades the code structure of customer class automatically; To originally call the service sector of breakdown and change into and call Stub service call code, the part that wherein need change comprises the declarative statement relevant with service class, method call statement and states the statement that calls its method simultaneously.
At last, the part relevant with service class is deployed in the service container in the source code that the user is uploaded, and combines Stub service call code to be deployed in the application server together remaining part.
The present invention provides a kind of and on cloud computing platform, disposes the conventional method of using with the mode of SOA, comprises the following steps:
1) resolves the configuration file that the user sets, and in internal storage structure, generate a service class tabulation, conveniently generate dynamically updating of corresponding wsdl document and customer class code through service class.
2), from the source code file that the user disposes, extract service class, and generate corresponding wsdl document based on the information in the service class tabulation.
3) produce corresponding Stub service code according to the wsdl document that generates, Stub service call code is added in the source file of user's deployment.
4) according to the service class tabulation, upgrade customer class automatically, declarative statement that will be relevant with service class, method call statement etc. dynamically are adjusted into the mode that is complementary with the Stub service call.
5) with being deployed to respectively in the different service containers with the relevant part of service class in the source code, remaining part class combines Stub service call code to be deployed in the application server together.
Wherein, in said step 1),, user configured service class is made up the class of service table of a correspondence in internal storage structure through resolving the configuration file that the user disposes.User configured service class is represented and need be come with the customer class difference of calling them with the service manner operation in cloud computing platform.The configuration file format that the user sets is the XML file, and service class exists with the right likeness in form of namel-class.Can accomplish the parsing of XML configuration file through the DOM technology.
Wherein, In said step 2) in, at first, from the source file that the user uploads, extract corresponding service class according to the content of service class tabulation; Then tool using (like the java2wsdl order) for each service class generates corresponding wsdl document, accomplished by Automatic Program by whole process.
Wherein, In said step 3), at first according to the wsdl document that generates, tool using (like the wsdl2java order) generates corresponding Stub service call code; Wsdl2java is not the reverse computing of java2wsdl, but produces the encapsulation code to wsdl document.Then the Stub service call code that produces is embedded in the source program, whole process is accomplished by Automatic Program.
Wherein, In the said step 4); Automatically upgrading customer class is through performance analysis customer class source program, and the statement that its method is called in declarative statement that will be relevant with service class, method call statement and statement simultaneously dynamically is adjusted into the mode that is complementary with the Stub service call.Through lexical analysis, navigate to the statement relevant with service class, then judge to belong to which kind of statement, if the service class declarative statement is the declarative statement of respective class in the Stub service call code with regard to the update service class.If service object's method call statement is updated to the statement relevant to the Stub service call equally.If the statement of its method is called in statement simultaneously, accomplish renewal respectively according to aforementioned two kinds of methods, to upgrade the back that finishes up to all statements relevant and finish with service class, whole process is accomplished by Automatic Program.
Wherein, in the said step 5), the deployment of application system is that branch two parts are accomplished.A part is service, at first will serve to be converted into automatically and can dispose parts, wherein comprises service class itself and corresponding deployment descriptor file.Then with service arrangement in service container.Another part is and user-dependent applying portion that this part is deployed in the application server.
Description of drawings
Fig. 1 is for using the preceding application deployment Organization Chart of the present invention.
Fig. 2 is an application deployment Organization Chart behind use the present invention.
Fig. 3 is the inventive method principle schematic.
Fig. 4 is for upgrading customer class method principle schematic.
Embodiment
For making characteristic of the present invention and advantage obtain more clearly understanding, below in conjunction with accompanying drawing, elaborate as follows: as shown in Figure 1, the conventional application done as a whole being deployed in the application server.The performance of this application server has proposed very high requirement; All application operate on the station server simultaneously, when the application of disposing more for a long time, will become very fierce to contention for resources such as CPU, storages; Thereby cause server performance to descend, the normal operation of using is disposed in also influence simultaneously.In order to address this problem, proposed application system is deployed to the SOA mode thought of cloud computing platform.The core concept of cloud computing is computational resource unified management and the scheduling that connects with network in a large number; Constitute a computational resource pond to user or application service; Though solved the not enough problem of single server performance; But also brought the communication issue between a plurality of computational resources, the introducing of SOA has well remedied this defective.Computational resource is divided into application server and service container, so just can a large amount of logical process and data access operations consuming time be encapsulated as service, and operates in the service container.Fig. 2 has shown after use the inventive method; Conventional application deployment moves synoptic diagram to cloud computing platform with the SOA mode; As shown in the figure, which class need be moved with service manner during the user used that configuration file mark is conventional and uses, and combination application itself together is deployed on the cloud computing platform.Then, cloud computing platform is used SOAization with routine, the part reserve part relevant with user interactions is deployed in the application server, and the distribution mechanisms of user configured service through cloud computing platform is deployed in the service container of dispersion.Make and dispose conventional application in this way and will bring following benefit: application server only moves the application with the user interactions part correlation; And logical process, data access consuming time are in a large number transferred the service execution in the service container; Significantly reduce the calculated amount of application server, guarantee the operation that application server can be good.A plurality of delivery of services in different service containers, can be realized the load balancing of computing power, support the executed in parallel of a plurality of services simultaneously, improve the overall performance of application system.Convert logical process, data access into the service manner operation, realize the multiplexing of logical process, data access through service sharing.
As stated, SOA is fit to cloud computing platform very much, and directly adopting the mode Application and Development of SOA and being deployed on the cloud computing platform is the mode that is worth high praise.But this splits a person on the one hand and requires too high; Difficulty is bigger, also need relearn the relevant knowledge of SOA, also existing application is kept outside of the door on the other hand; Want existing application deployment to cloud computing platform; Also will adopt the mode of SOA to develop again according to the regulation of cloud computing platform, this all be huge waste undoubtedly concerning human and material resources.So the present invention proposes a kind ofly on cloud computing platform, to dispose the conventional method of using with the mode of SOA; Be intended to solve the wide gap between conventional application and the cloud computing platform deployment; Can with a large amount of existing application deployments in cloud computing platform, remove from and develop the cost that brings once more simultaneously.
More than set forth on cloud computing platform the plurality of advantages of disposing conventional application process with the mode of SOA, introduced the realization principle of this method below in detail, as shown in Figure 3, the detailed step of realizing this method has been described.
Step 1: through reading configuration file, the tabulation of initialization service class.Configuration file adopts the stored in form data of XML (Extensive Makeup Language), and its structure is as follows:
The XML file is converted into the internal storage structure that service class is tabulated, and service class is to exist with the right form of namel-class in the XML file.Can accomplish the parsing of XML configuration file through the DOM technology.
Step 2: based on the service class tabulation that generates in the step 1, these service class of location in source file, and use the java2wsdl order that service class is generated corresponding wsdl document.Detailed directions is following:
java2wsdl-cp.-cn?package.TestClassService-of?TestClassService.wsdl
Wherein ,-cp parameter specified class path ,-cn representation class title ,-of representes the output file title.So said method is illustrated under the current class.path, use the class of package.TestClassService by name to generate the file that is called TestClassService.wsdl.TestClassService.wsdl is corresponding one by one with the package.TestClassService class; Described all methods that package.TestClassService comprised, just described with package.TestClassService service and carried out agreement and the information format that to bind when mutual.
Step 3: generate Stub service call code.It is not necessary generating Stub service call code, and customer class is directly visited wsdl document also can realize service call.But directly visit wsdl document and call the service more complicated, this upgrades customer class automatically for the back and has proposed challenge.And use the wsdl2java order can use wsdl document to generate corresponding Stub service call code.Customer class is realized service call through operation Stub service call code, and does not need and the wsdl document direct communication again.The Wsdl2java detailed directions is following:
wsdl2java-uri?TestClassService.wsdl-p?package-s-ssi-o?build/service
Wherein,-uri parameter is specified the path of wsdl document, and-p specifies the bag name that generates the java program code, and it is the synchronization of access mode that-s specifies the service call mode of the code that produces;-ssi specifies the interface that produces service implementing, and-o specifies the storing directory of generating routine code.Carry out the method, will generate Stub service call code automatically.It is noted that wsdl2java is not the reverse process of java2wsdl, java2wsdl generates corresponding wsdl document with real service class, i.e. the detailed description file of service.And wsdl2java is used for producing resolving wsdl document, produces the code encapsulation of calling active service.That is to say that the Stub service call code that wsdl2java produces is to call actual service class through wsdl document to carry out corresponding operating.And actual service class is exactly the class that in the java2wsdl order, is used to produce wsdl document.
Step 4: upgrade customer class.As stated, generate corresponding wsdl document, then produced corresponding Stub service call code based on user configured service class.Service class is deployed on the different servers with customer class the most at last.Communicate through Stub service call code between them, promptly customer class calls the logical process that the active service class provides through Stub service call code.But in the source file that the user submits to, customer class use still directly to the calling of service class, this has just produced contradiction.Solution to this problem is to dynamically update customer class, and original logic transition of directly realizing through service class is realized for passing through Stub service call code.Through analyzing, the place that needs to upgrade comprises three aspects, is respectively: declarative statement part, attribute method call statement part and statement comprise the statement part of method call simultaneously.Concrete renewal process is as shown in Figure 4.
Owing to need dynamically update customer class, need carry out lexical analysis, thereby which place of mark needs to upgrade.Lexical analysis adopts finite automaton to realize; Owing to need all not analyze, because all statements that need upgrade are all in a sentence, so adopt the morphology analysis methods of simplifying to each speech; With the sentence is that unit analyzes, the standard of weighing sentence be ' { ', ' } ', '; ' character.So just obtained each sentence in the customer class code.
The morphology analysis methods of simplifying is adopted in the front, produces a sentence each time.Service class statement location is exactly the place that positioning service class correlative occurs in a sentence, upgrades the corresponding client class then.The service class correlative has 3 kinds of forms of expression in customer class.They are respectively:
1) service class declarative statement.
2) statement of its method of object reference of stating of service class.
Call the statement of its method when 3) service class is stated.
Because 2) the service class title possibly not appear in; And the object that service class is stated just appears; So in total system, keep the mapping of a service class and its object oriented is necessary very much; Total energy guarantees to navigate to the object that service class is stated like this, because object must statement calling before, this is just 1) in completion.
After the service class correlative location, just need dynamically update customer class.Illustrate update rule below:
The service class declarative statement, when positioning service is included in the service class tabulation to certain class, and when stating; Just need upgrade; Update rule is: service class is added the Stub character string at the back, represent a new class, this type is in Stub service call code.This new class need be imported parameter into, and the address of using url type of the adding title that has configured to navigate to concrete service gets final product.
Illustrate as follows:
Before the renewal:
TestClassService?tcs＝new?TestClassService()；
Upgrade the back:
url＝base_url+″TestClassService″；
TestClassServiceStub?tcs＝new?TestClassServiceStub(url)；
Wherein, url and base_url are predefined variable, wherein
url＝″″；
base_url＝″http://localhost:8080/axis2/services/″；
Base_url has specified the address of disposing single service; Add that TestClassService representes complete service path; And the variation of declarative statement is only just added the Stub character string at the back at class name; TestClassServicestub is exactly the class in the Stub service call code that generates automatically, has encapsulated the details of the concrete service of visit.After having upgraded declarative statement, need record service class and mapping thereof to TestClassServiceStub-tcs.
The statement of its method of object reference that service class is stated, this moment, update rule was: find out corresponding service class according to the object of method call.In Stub service call code, find out corresponding and method name, class that the method rreturn value is relevant then, and set a property the initial caps of parameter name during attribute method by name is stated in pairing for the method name.Through the front find out the class and attribute; Corresponding class of statement method name, set a property, state the class that the method rreturn value is corresponding and use the Stub object reference method of front statement and the result is returned to the corresponding class of rreturn value, can obtain the value of reality through the corresponding class of rreturn value.Illustrate as follows:
Before the renewal:
int?s1＝tcs.add(10，20)；
Upgrade the back:
TestClassServiceStub.Add?add＝new?TestClassServiceStub.Add()；
add.setl1(10)；
add.setl2(20)；
TestClassServiceStub.AddResponse?addResponse＝tcs.add(add)；
int?s1＝addResponse.get_return()；
The semanteme of method call statement is to import two parameters into, is respectively 10 and 20, and calls the add method processing parameter of the object tcs that service class states, and result is deposited among the s1.I1 is the attribute of method class, that is to say the parameter of service class add method.
Call the statement of its method in the time of the service class statement; Update rule is the summation of the two kinds of situation in front; Update method is constant basically; What just service class was claimed as object has done little change nominally, for fear of duplication of name, adopts service class initial small letter to add the integer variable that an overall situation increases progressively.Also need write down service class and mapping thereof at last to TestClassServiceStub-testClassServiceStub1.Illustrate as follows:
Before the renewal:
int?s5＝new?TestClassService().sub(20，10)；
Upgrade the back:
TestClassServiceStub?testClassServiceStub1＝
new?TestClassServiceStub(base_url+″TestClassService″)；
TestClassServiceStub.Sub?sub＝new?TestClassServiceStub.Sub()；
su?b.setl1(20)；
sub.setl2(10)；
TestClassServiceStub.SubResponse?subResponse＝testClassServiceStub1.sub(sub)；
int?s5＝subResponse.get_return()；
Step 5: system deployment.System deployment comprises two parts, and a part is the deployment of service, and another part is the deployment of customer class.The deployment of customer class is as broad as long with the conventional use system deployment, only need copy under the corresponding catalogue of application server to get final product, under the webapps catalogue under the Tomcat.The deployment of service is more loaded down with trivial details relatively, at first need generate the description configuration file services.xml of coupling for service class, is packaged into a whole file (* .aar) issue then.The Services.xml configuration file is generated by system automatically, and its file layout is following:
Automatically after having generated services.xml, put it into/the tmp/META-INF/ catalogue under, the binary file that then source file is generated copies to/the tmp catalogue under, generate corresponding service arrangement file through the jar order at last, jar orders use as follows:
cd/tmp
jar?cvf?TestClassService.aar.
At first entering/tmp catalogue is packaged into TestClassService.aar with the All Files under the current directory then, at last TestClassService.aar is copied to that corresponding catalogue gets final product under the service container.When using Axis as the service operation container, its catalogue is: AXI_HOME/WEB-INF/services.
Above-described content has been done detailed explanation to each step of the inventive method; But concrete way of realization of the present invention is not limited thereto; For the those skilled in the art in present technique field, the various conspicuous change of under the situation of spirit that does not deviate from the method for the invention and claim scope, it being carried out is all within protection scope of the present invention.
Claims (10)
1. on the cloud platform, dispose the conventional method of using for one kind, it is characterized in that it may further comprise the steps with the mode of SOA:
1) resolves the configuration file that the user sets, and in internal storage structure, generate a service class tabulation;
2), from the source code file that the user disposes, extract service class, and generate corresponding wsdl document based on the information in the service class tabulation;
3) produce corresponding Stub service code according to the wsdl document that generates, Stub service call code is added in the source file of user's deployment;
4) according to the service class tabulation, upgrade customer class automatically, declarative statement that will be relevant with service class, method call statement etc. dynamically are adjusted into the mode that is complementary with the Stub service call;
5) with being deployed to respectively in the different service containers with the relevant part of service class in the source code, remainder combines Stub service call code to be deployed in the application server together.
2. the method for claim 1; It is characterized in that: in said step 1); Through resolving the configuration file that the user disposes; The service class that user configured service class is made up a correspondence in internal storage structure is tabulated, and user configured service class is represented and need be come with the customer class difference of calling them with the service manner operation in cloud computing platform.
3. the method for claim 1 is characterized in that: in said step 2) in, at first, from the source file that the user uploads, extract corresponding service class according to the content of service class tabulation, then generate corresponding wsdl document for each service class.
4. the method for claim 1 is characterized in that: in said step 3), at first according to the wsdl document that generates, generate corresponding Stub service call code, then the Stub service call code that produces is embedded in the source program.
5. the method for claim 1; It is characterized in that: in the said step 4); Through lexical analysis, navigate to the statement relevant with service class, then judge to belong to which kind of statement; Upgrading corresponding service class according to the transformation rule of correspondence then is Stub service call code, accomplishes the renewal of customer class.
6. method as claimed in claim 2 is characterized in that: the configuration file format that the user sets is the XML file, and service class is deposited with the right form of namel-class, accomplishes the parsing of XML configuration file through the DOM technology.
7. method as claimed in claim 5 is characterized in that: its transformation rule comprises three parts, is respectively the transformation rule of declarative statement, the transformation rule of method call statement and the transformation rule of statement while call method statement.
8. method as claimed in claim 7; It is characterized in that the transformation rule of said declarative statement is: service class is added the Stub character string at the back, represent a new class; This type is in Stub service call code; This new class need be imported parameter into, uses the url that has configured to add that class name is referred to as parameter, the address of the concrete service of expression.
9. method as claimed in claim 7 is characterized in that, the transformation rule of said method call statement is: find out corresponding service class according to the object of method call; In Stub service call code, find out corresponding and method name, class that the method rreturn value is relevant then, and set a property the initial caps of parameter name during attribute method by name is stated in pairing for the method name; Through the front find out the class and attribute; Corresponding class of statement method name, set a property, state the class that the method rreturn value is corresponding and use the Stub object reference method of front statement and the result is returned to the corresponding class of rreturn value, can obtain the value of reality through the corresponding class of rreturn value.
10. method as claimed in claim 7; It is characterized in that; The said statement update rule of call method statement simultaneously is the summation of the two kinds of situation in front, and update method is constant basically, just need do than minor change during the statement of service class; For fear of duplication of name, adopt service class initial small letter to add integer variable that an overall situation increases progressively as new object name.
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