CN101777004A

CN101777004A - Method and system for realizing BPEL sub-process multiplexing based on template in service-oriented environment

Info

Publication number: CN101777004A
Application number: CN201010101686A
Authority: CN
Inventors: 程渤; 章洋; 陈俊亮; 邓敏
Original assignee: Beijing University of Posts and Telecommunications
Current assignee: Beijing University of Posts and Telecommunications
Priority date: 2010-01-26
Filing date: 2010-01-26
Publication date: 2010-07-14
Anticipated expiration: 2030-01-26
Also published as: CN101777004B

Abstract

The invention discloses a method and a system for realizing BPEL sub-process multiplexing based on a template in a service-oriented environment. The method comprises the following steps of: performing model definition on the template to store related information which is needed when a BPEL sub-process is extracted for multiplexing; resolving an existing BPEL file and a related WSDL file, establishing a BPEL model and a WSDL model, extracting the needed BPEL sub-process from the existing BPEL file according to the established models, and encapsulating the extracted sub-process into the template and storing the template into a template base; and reading template information from the template base during development and calling the template to a BPEL process visualized development window to ensure that a user also can call the template to assist process design and development when developing the BPEL process, and the unification of a template mechanism and the BPEL process development can be realized. The method can realize the BPEL sub-process multiplexing, can greatly reduce work load of developers, improves the development efficiency of service combination, and shortens the development cycle by a pre-designed intra-industry common process template or a user-defined multiplexing template.

Description

Realize the multiplexing method and system of BPEL sub-process based on template in the service-oriented environment

Technical field

The present invention relates to service-oriented development technique field, specifically, is to realize the multiplexing method and system of BPEL sub-process based on template mechanism in the service-oriented development environment.

Background technology

Along with the appearance of service-oriented thought, come constructing system to become present research focus with the method for Services Combination.And Web Services technology is the main method of the service that at present an infosystem is packaged into, also be SOA (Service-Oriented Architecture, service-oriented architecture) design philosophy pith, can reduce the difficulty and the complexity of system development based on the method for the Services Combination of Web Service, the raising system is to the adaptive faculty of business demand complicated and changeable.The technician can design and Implement a cover total solution and adapt to business demand complicated and changeable by the combination to existing Web Service.

In the Services Combination of Web Service, generally can final combination process be described by certain script, and in engine deploy and the operation of supporting this script.This script is become the service orchestration language, belongs to this one deck of service orchestration.At present, the service orchestration language of comparative maturity mainly contains BPEL (Business Process Execution Language, BPEL).At present, for the exploitation of BPEL script, companies such as IBM, Oracle and Microsoft all provide widely and have supported.These companies all provide the BPEL of own exploitation to carry out the development environment of engine and supporting with it BPEL script graphization.But in numerous execution engines and pattern development environment, lack a cover perfect solution flexibly all the time for the multiplexing mechanism of BPEL script, most systems only provide the part support, and it is big to use difficulty.

Consider in actual life, in fact utilize BPEL to carry out combination and system development between Web Services, mostly be based on and develop in certain industry field.And an industry field inside has the logic of a lot of business and function can be repeated to use in fact.But this reusable level and granularity also may be diversified.Therefore wishing can these logic function of efficient multiplexing, also must need to provide a cover dirigibility the high mechanism of taking.Simultaneously, same industry field inside between different solutions, also all can possess own distinctive logical design for same business, and this just means that system also will give the enough independences of user, allows it can carry out Autonomous Control to multiplexing logic.

And, owing to the complicacy of system and the change of current demand or the like reason, all inevitably to carry out new exploitation or modification to existing BPEL script.Especially when creating new related procedure, tend to reuse the BPEL fragment of developing in the past, if but all carry out the encapsulation of BPEL flow process, will certainly cause the complicacy on flowage structure and level again, make troubles.

Therefore, existing BPEL application facet exists some shortcomings: at first, the exploitation of BPEL flow process is bigger to the dependence of concrete actual scene, need use the development block design of atomic size to realize new flow process at different business scenarios, lacks certain dirigibility; Secondly, the exploitation to BPEL at present lacks the complete multiplexing mechanism of a cover, and existing BPEL Designer only provides the BPEL basic activity, causes the workload of overlapping development very big like this, at present, at this problem, does not also have the effective solution of a cover.

Summary of the invention

The technical problem to be solved in the present invention provides in a kind of service-oriented development environment and realizes the multiplexing method and system of BPEL sub-process based on template mechanism, can realize multiplexing to the BPEL sub-process, also can preestablish general operation flow template in the industry, thereby significantly reduce developer's workload, improve service-oriented development efficiency, shorten the construction cycle.

In order to solve the problems of the technologies described above, the invention provides in a kind of service-oriented development environment based on the multiplexing method of the BPEL sub-process of template mechanism, may further comprise the steps:

A. generate the template step: the structure of resolving the BPEL flow process, multiplexing BPEL sub-process need be carried out in the instruction location that receives the user, extract the user then and need multiplexing BPEL sub-process, template model according to definition encapsulates sub-process, and provide the interface definition of encapsulation rear pattern plate, at last the template that generates is saved in the local template base;

B. rigging step: the template in the template base is loaded in editor's development environment of operation flow, and keeps upgrading synchronously, and butt joint for the interface of template is provided with template base; Template is carried out corresponding BPEL grammer checking and template related check;

C. derive the template step: the BPEL operation flow that will contain the template extension tag is converted to the executable BPEL of standard, comprise the variable in the BPEL template that has encapsulated that to call, conditional parameter carries out instantiation according to the parameter in the interface conversion, obtain meeting the BPEL fragment of idiographic flow requirement, replenish complete BPEL flow process then, obtain executable standard BP EL flow process.

Further, described steps A specifically comprises:

A1. the BPEL file is resolved;

A2. set up the tree structure of BPEL, and this structure is offered graphical display module;

A3. graphical display module is showed whole BPEL with the mode of optional multiway tree hierarchical structure is known and is expressed the level relation of inclusion of node, title, type and the association attributes of node to the user;

A4. the user chooses from the BPEL of institute tree structure oneself needs to extract the part that is encapsulated into template;

A5. the BPEL snippet extraction of the user being chosen comes out to be saved in the template, and simultaneously that this BPEL fragment is relevant attribute information and WSDL information all extract in the lump;

A6. show in the BPEL fragment of extracting, need the user to carry out interface operable information, comprise input variable, output variable and controlled condition, be saved in the template file, and the template that obtains is saved in the template base.

Further, in the described steps A 1 the BPEL file resolved and comprises:

A) read the user and specify the BPEL file that carries out the template extraction, resolve, at first create the BPEL document object by XML;

B) according to the wsdl document that is associated of user's appointment, cooperate when resolving the BPEL file, obtain the wsdl document information of being introduced, message, the partnerLinkType in the extraction wsdl document and the information of portType element are preserved;

C) adopt recursive mode to travel through the tree structure of whole BPEL file, resolve each BPEL activity, extract variable, partnerLinkType and portType attribute for the BPEL basic activity and add in the template and preserve; For the BPEL container activities, if there is controlled condition, the property value that extracts its condition adds in the Template Information preserves.

Further, in the described steps A 6, the input variable and the output variable of described displaying obtain in the following manner:

At first, find out all variablees in the multiplexing BPEL sub-process.Guarantee when the interface of encapsulation template, the phenomenon of losing of variable can not occur;

Then, input variable set and output variable set in the sub-process are determined in all activities in the traversal sub-process;

At last, remove the public variable in two set, the input variable and the output variable of required definition when obtaining the encapsulation of described BPEL template.

Further, in the described steps A, the encapsulation of template specifically comprises:

The BPEL fragment that parsing extracts is analyzed and is obtained all BPEL activities that it comprises, and each BPEL activity all is saved among the node listing nodeList.

Read BPEL activity current among the nodeList, judge the basic activity that this BPEL activity is BPEL, or the container activities of BPEL, if the BPEL basic activity extracts each variable in the BPEL basic activity; If the container activities of BPEL, then continue to judge whether this container activities contains controlled condition, if comprise controlled condition in this container activities, earlier controlled condition is extracted and be saved in the template, path with the controlled condition place also is saved in the template then, judge in the controlled condition extract whether contain variable,, all variablees are parsed be saved in the input variable tabulation if having; If no, the variable analysis of end node; If do not comprise controlled condition in the container activities, judge again whether this container activities is the scope activity, if, judge in this scope activity and whether defined local variable, if defined local variable, then all local variables are saved in the output variable, if do not define local variable, the variable analysis of end node in the scope activity.

Further, described step B specifically comprises:

Read Template Informations all in the template base, and import in the graphical interfaces display panel;

The user is selection activity or line from described graphical interfaces display panel, if what the user selected is movable, what judge user's selection is BPEL activity or template, if BPEL activity, the icon that in editor, shows this BPEL activity earlier, by the user attribute of the BPEL activity added is provided with then: if the BPEL basic activity,, and then create the variable relevant for this activity with importing for the partnerLink of its dependence is created or imports in this activity; If what the user selected is container activities, this container activities has controlled condition to need to specify simultaneously, adds corresponding controlled condition by the user;

If the user has selected template, at first indicating template icon in editor extracts the information of preserving in the template file, imports wsdl document, partnerLink and variable that this template relies on;

If what the user selected is line, specified the source and target of this line by the user, on editor, demonstrate line, judge whether the destination node of line this moment is template, if, by the user is the input variable that template is selected coupling, or add the controlled condition of coupling for template, and preserve the retouching operation that the user makes for template, judge whether the user also continues to edit flow process, if repeat above-mentioned process; If not, preservation is withdrawed from.

Further, the user finishes the template interface interactive operation and preserves when withdrawing from, and triggers following operation:

Read the variable information among the variable list variableList, and obtain the Template Information at certain node place;

Whether the template of judging this node place is current template of editing, if not, continue to read the variable information among the variableList; If at first setting up corresponding BPEL file is complete BPEL tree, according to the variable routing information of preserving in the template, navigates to variable or the position of condition in template that will revise, upgrades the information of BPEL code then,

Judge whether also have variable not handle among the variableList,, to read untreated variable and carry out above-mentioned processing if having; If no, end loop.

Further, described step C specifically comprises:

C1. at first travel through the line in the whole flow process code, the node that all lines are connected all adds among the nodeList, does not have identical node in this nodeList; Find the starting point of whole flow process, read in the node of current locking then;

C2. the node of judging current locking is BPEL activity or template;

If C3. present node is the BPEL activity, forward step C4 to; If present node is a template, extract the BPEL fragment of preserving in the template, the retouching operation of preserving during then according to splicing upgrades operation to the BPEL fragment that extracts, and forwards step C4 to;

C4. preserving in the BPEL file that this node is exported to appointment according to the order and the hierarchical relationship of line, is itself activity definition and relevant attribute definition what derive when movable for BPEL; For template the time, derive the BPEL fragment of still having upgraded that defines in the template;

C5. in the BPEL file, import the wsdl document relevant with present node, and relevant partnerLink and the definition of variable;

C6. judge whether that node does not export in the BPEL file of appointment in addition, if having, read next node, execution in step C2～C5; If no, jump out circulation, finish the derivation process.

The present invention also provides in a kind of service-oriented development environment and has realized the multiplexing system of BPEL sub-process based on template mechanism, comprising:

BPEL script parsing module, be used for the BPEL script is resolved, resolve, rely on the EMF model of BPEL by XML based on Dom, BPEL script that will extract the user and the wsdl document that is associated are set up tree shape model, obtain the information of each the BPEL activity in the BPEL script;

Template extracts and package module, analysis result according to described BPEL script parsing module, the BPEL script fragments that is used for the user is chosen extracts, and by show the structure of whole BPEL to the user, is selected the BPEL logic that need extract and encapsulate by the user; After determining the BPEL code that extracts, generate template according to existing Template Schema encapsulation, be saved in the template base;

The Services Combination module is used to develop the BPEL operation flow and merges template mechanism, finishes the exploitation to operation flow; Finish the combination operation to template, comprising: all input variables that define in the docking port are carried out assign operation accordingly; All controlled conditions that define in the docking port are reseted operation accordingly; Provide basic activity and the structured activities of BPEL to help form assembly and operation.

Further, also comprise:

New business derives module, be used for the operation flow that has editted is derived the executable BPEL script of generation, comprise:, obtain a series of effective nodes the analysis of graphical file, simultaneously the effective information that comprises in the template is wherein extracted, last is saved in the BPEL script.

Realize the multiplexing method and system of BPEL sub-process based on template mechanism in the service-oriented development environment provided by the invention, its dirigibility is good, and the level that extracts and make up is various, and granularity also can be carried out better controlled; Can comprise the developing business processes that BPEL flow process and template merge simultaneously based on patterned development interface, can effectively reduce the work of user's secondary development; Utilize the present invention, the user can use based on the extension tag of template and assist exploitation, but finally is convertible into WS-BPEL script executable, compliant, can carry out on the engine at different BPEL and move; Can be good at generating its required template according to user's demand, the general service flow template in the perhaps pre-designed industry has very high customizability.

Description of drawings

Fig. 1 is the synoptic diagram of the method for code reuse in the service-oriented development environment of the present invention;

Fig. 2 is the synoptic diagram of an embodiment of definition structure of the schema of template model;

Fig. 3 is the process flow diagram that the present invention serves extraction;

Fig. 4 is the process flow diagram that the BPEL file is resolved;

Fig. 5 is the synoptic diagram that template is encapsulated;

Fig. 6 is the process flow diagram that the user uses template base to edit by palette;

Fig. 7 is the process flow diagram that performance history is spliced;

Fig. 8 finishes the process flow diagram of modification being preserved to behind the editor of template line;

Fig. 9 is the process flow diagram that template derives;

Figure 10 is a system verification processing flow chart of the present invention;

Figure 11 is the structural drawing of system of the present invention.

Embodiment

The invention will be further described below in conjunction with the drawings and specific embodiments, can be implemented so that those skilled in the art can better understand the present invention also, but illustrated embodiment is not as a limitation of the invention.

The present invention is the difficulty for the dirigibility that increases the BPEL exploitation and effective developer's of reduction secondary development, the present invention not only provides a cover the complete patterned development environment of BPEL, more propose and realized that a cover realizes the multiplexing method and system of BPEL sub-process based on template mechanism, thereby allow the exploitation personnel carry out developing business processes by patterned mode, also can effectively provide the feasible multiplexing mechanism of a cover to reduce the difficulty of secondary development, improve development efficiency by default industry generalized flowsheet template.The present invention has independently template model, defined one and overlapped the mechanism that the template label is expanded the extraction, encapsulation, splicing and the derivation that have realized template, what finally obtain remains the executable BPEL file that meets the WS-BPEL standard, therefore, the form that the operation flow of the present invention's exploitation finally remains with the BPEL script represents, and also can carry out on the engine at all general BPEL and move.

As shown in Figure 1, the present invention is deposited in the template base then and preserves by coming the BPEL fragment that needs reuse is effectively encapsulated based on the mechanism of template.The invention provides the complete pattern development environment of a cover, can not only effectively improve developer's efficient, also the exploitation of template mechanism and BPEL flow process can be merged, provide a cover complete development scheme efficiently.After finishing the editor of flow process, system can export to the flow process that edits executable BPEL file, and the encapsulation that is increased for the BPEL fragment before removing is accomplished to the conversion of BPEL script.In addition, total system also provides complete authentication mechanism, can extract template, template assembling and template derive this several sections all provides the grammer checking of BPEL to support.Simultaneously, provide corresponding authentication mechanism for the multiplexing mechanism of template.

Code reuse of the present invention system at first needs to finish the description work for the BPEL code segment for efficient multiplexing BPEL code.After system user extracted the BPEL code segment that oneself need encapsulate, this system can be encapsulated into it template of Unified Form automatically, by the parsing of system, and the interface message of the BPEL code segment that extracts under this template meeting detail record.Therefore, this system must at first provide the model definition of a cover template encapsulation, is used for preserving needed relevant information.

The model layer of system has been finished the definition for template, and system mainly finishes operations to template by self-defining extension tag.So system realizes the process of modeling by the schema of definition template.For the BPEL fragment that needs are re-used, can be understood as a code in the function, and template is exactly carry out the definition and the description work of similar function interface will for this section code.So as a template, when being exposed to the user and using, just must statement interface definition wherein, mainly comprise several aspects:

＜template〉preserve self information when front template, as NameSpace and template name;

＜inputVariable〉preserve in the template variable relevant information as input variable.Comprise input in the message all input parameters and the structure of parameter, and in which activity, use this input variable.

＜outputVariable〉preserve in the template variable relevant information as output variable.Comprise all output parameters in the output message and the structure of parameter, and which activity to have used this output variable in.

＜element〉information of the concrete parameter that defines in variable has been described.

＜condition〉preserve in the template relevant information as controlled condition.Comprise the content of the control activity at this controlled condition place and this controlled condition and the user increases when extracting note.

＜activity〉be kept at the BPEL action message that comprises in the BPEL fragment of extraction.

＜bpelCode〉preserve the BPEL fragment of template encapsulation.

＜wsdlCode〉preserve the wsdl document information that the BPEL fragment of template encapsulation is associated.

The definition of the schema of template model as shown in Figure 2.

System of the present invention provides a cover customization own needed BPEL template for the user, the mechanism of template extraction just.When exploitation BPEL flow process, especially when the flow process that the exploitation industry field is correlated with, it all is similarly in fact that many service logics are arranged, or part similarly.For these service logics that can frequently be used, if it can be packaged into template, when exploitation, do as a whole use, must bring great convenience to the developer.

Template extracts since an existing BPEL file.The user is for own interested BPEL flow process and the wsdl document that is associated, and the guide by system is incorporated into system, and the system's wsdl document that can resolve this BPEL flow process automatically and be associated is set up BPEL and WSDL model then.Total with the BPEL flow process all shows the user with patterned tree structure then.Can select user at this moment the own multiplexing BPEL logic that needs, allow system carry out the extraction and the encapsulation of template, generate the user's interest template, or the user creates the interior general operation flow template of own industry, be saved in the template base then.

This system provides good dirigibility and customization, can allow the user use this system to set up the template base of oneself, own interested BPEL service logic can be packaged into template and be saved in the template base.System offers the function that the complete template of user's one cover extracts and encapsulates.And the template that these extract can effectively reduce user's development difficulty.

As shown in Figure 3, this system mainly may further comprise the steps when serving extraction:

1.BPEL the parsing of file.Its concrete process as shown in Figure 4.

A) read the user and specify the BPEL file that carries out the template extraction, resolve, at first create BPEL Document object by XML.

B) according to the wsdl document of user's appointment, cooperate when resolving the BPEL file, obtain the wsdl document information of being introduced.Message, the partnerLinkType in the extraction wsdl document and the information of portType element are preserved.

C) adopt recursive mode to travel through the tree structure of whole BPEL file, resolve each BPEL activity.So the BPEL basic activity being extracted attributes such as variable, partnerLinkType and portType adds in the template and preserves.For the BPEL container activities, if there is controlled condition, the property value that should extract its condition adds in the Template Information preserves.

2. after the parsing work of carrying out BPEL file that template extracts and wsdl document being finished, system can set up the tree structure of BPEL accordingly, and this structure is offered the graphical display module of wizard.

3. graphical display module is after the request of receiving, the mode of using optional multiway tree shows that the hierarchical structure of whole BPEL gives the user, wherein can know the level relation of inclusion of expressing node, and the title of node, the attribute that type is relevant with some is as condition or variable etc.

4. then, the user is at the BPEL structural drawing that displays, and choosing oneself needs to extract the part that becomes template.

5. then, the BPEL snippet extraction that system will choose the user is come out, and is saved in the template.Simultaneously, this section BPEL code associated attributes information and WSDL information are all extracted in the lump.

6. show in the BPEL fragment of extracting, need the user to carry out interface operable information, mainly comprise input variable, output variable and controlled condition.The user can also use this template with the user who makes things convenient for other to the note of each variable and condition interpolation oneself this moment.

7. then, with the BPEL fragment, information such as variate-value that parses and controlled condition all are saved in the template file, have also just finished the encapsulation work to template.

8. last, the template that obtains is saved in the template base of appointment.

System needs the relevant information of the interface of definite this template when template is encapsulated, mainly be the controlled condition that comprises in input variable, output variable and the template.But in a flow process fragment, there is a lot of activities, these activities all can use variable, which how to be distinguished wherein is the variable that needs extraneous input, and which is to export to extraneous variable, also has which variable just to use at the BPEL sheet intersegmental part that extracts.Basic thinking is that the BPEL fragment that extracts is resolved, and the movable employed variable of each BPEL that wherein comprises is analyzed.Set up two set, a variable that is used for storing each action need input, another is used for storing the variable of each action need output.Adopt set, can not include the variable of repetition in each set.After finishing set, just variable public in two set is removed, because the variable that this part total variable just uses at the BPEL sheet intersegmental part that extracts, the flow process outer with fragment do not have anything to get in touch.Rest parts is exactly the input variable that needs in the encapsulation template in the input set, and rest parts is exactly the variable that will export in the encapsulation template in output set.

Template encapsulates concrete performing step as shown in Figure 5, comprising:

1. resolve the BPEL fragment that extracts, analyze and obtain all BPEL activities that it comprises, and each BPEL activity all is saved among the nodeList.

2., enter circulation if nodeList is not empty.Read BPEL activity current among the nodeList.

3. judge that the BPEL activity that reads out is the basic activity of BPEL from nodeList, or the container activities of BPEL.

4., then begin to extract each variable in the BPEL basic activity if Ci Shi BPEL activity is the BPEL basic activity.Because different BPEL basic activities is different for the use of variable, so need here to treat respectively.

5. if the BPEL basic activity that reads in is the invoke activity, the inputVairable that then extracts in the invoke activity is saved in the input variable tabulation.And then the outputVariable that extracts in the invoke activity is saved in the output variable tabulation.

6. if the BPEL basic activity that reads in is the assign activity, the variable that then extracts among the from the assign activity is saved in the input variable tabulation.And then the variable among the in the extraction assign activity is saved in the output variable tabulation.

7. if the BPEL basic activity that reads in is the receive activity, the variable that then extracts in the receive activity is saved in the input variable tabulation.

8. if the BPEL basic activity that reads in is the reply activity, the variable that then extracts in the reply activity is saved in the output variable tabulation.

9. if the BPEL basic activity that reads in is the onMessage activity, the variable that then extracts in the onMessage activity is saved in the input variable tabulation.

10. if the BPEL basic activity that reads in is the onEvent activity, the variable that then extracts in the onEvent activity is saved in the input variable tabulation.

11. judge that the BPEL activity that reads out is the container activities of BPEL from nodeList, then continue to judge whether this container activities contains controlled condition.

12. if comprise controlled condition in this container activities, elder generation extracts condition and is saved in the template, and the path with the controlled condition place also will be saved in the template then.

13. judge in the controlled condition that extracts and whether contain variable.

14. if, all variablees are parsed to be saved in the input variable tabulate contain variable in the controlled condition.If do not comprise variable in the controlled condition, the variable analysis of end node.

15. if, need judge again then whether this container activities is the scope activity do not comprise controlled condition in the judgement container activities.

16. if the scope activity also will continue to judge whether defined local variable among this scope.

17. if, then all local variables are saved in the output variable defined local variable in the scope activity.

18. if do not define local variable, the variable analysis of end node in the scope activity.

System of the present invention uses and creates a BPEL activity do not have what difference for template, that is to say that this system combines the use of template and the flow process exploitation of BPEL.When the user of this system opens the graphics edition window, when wishing the new operation flow of one of exploitation, this system can provide outside the basic edit ability of BPEL, and the flow process edit mode based on template also is provided.

System can read in the information of the template of preserving in the template base automatically, and template is imported in the current operation flow editor, uses at any time for the user.The user just can the multiplexing easily template that has extracted like this.Be variable information and controlled condition relevant on the template definition of oneself, cooperate upward BPEL activity to carry out the control and the completion of template simultaneously, so just can Rapid Combination develop the needed new technological process of user.

After having set up corresponding template base, just can be with the template in the template base as starting point, the basic activity of BPEL and container activities realize business development mode flexibly in the cooperation.

As shown in Figure 6, begin to create new when professional when the user opens editor, the palette module can read all Template Informations in template base this moment automatically, and imports to graphical interfaces and show, for calling.The user can repeatedly pull BPEL activity or template that need to use and enter editor then, determines relation between each activity by line.Finish mutual between system and the user by patterned mode, the mode that helps the user to pull with figure is finished the editing of flow process.

In the process of the splicing of carrying out flow process, its concrete step comprises as shown in Figure 7:

1. the palette module can read all Template Informations in template base this moment automatically, and imports in the graphical interfaces display panel, for calling.

2. the user wants to edit flow process, therefore pulls an icon from palette in editor.What at this moment, need to judge that the user selects is movable icon or the line of selecting.

3. if what the user selected is movable, what judge then that the user selects is a BPEL activity, has still selected a template.

4., so at first in editor, show the icon of this BPEL activity if what the user selected is a BPEL activity.

5. the user need carry out corresponding setting to the attribute of the BPEL activity added then.If the BPEL basic activity needs to create or import for this activity the partnerLink of its dependence so, and then be this activity establishment variable relevant with importing.If what the user selected is container activities, when this container activities has controlled condition to specify simultaneously, as: the Rule of judgment of if, that user should add corresponding controlled condition.

6., but selected to add a template if the user does not select the BPEL activity.It at first also is indicating template icon in editor.

7. the information of preserving in the extraction template file imports the wsdl document that this template relies on.

8. the information of preserving in the extraction template file imports the partnerLink that this template relies on.

9. the information of preserving in the extraction template file imports the variable that this template relies on.

10. if what the user selected at the beginning is to add a line.The user has specified the source and target of this line, demonstrates line on editor.

11. judging the destination node of line this moment is a template.

12. if the destination node of line is a template, the user can double-click this line, system can eject an interface editor, is used for finishing the interactive operation with the user.Can be the input variable of template selection coupling this user, also can be the controlled condition that template is added coupling.System preserves the retouching operation that the user makes for template.

13. whether the user also continues editor's flow process.If continue then repeat top process.If the user has finished editor, just can preserve and withdraw from.

As shown in Figure 8, after the user finishes editor for the template line, click and preserve when withdrawing from, can trigger the following step and realize preservation revising.

1. at first read the variable information among the variableList, and obtain certain node place Template Information.

2. judge whether it is current template of editing.

3. if not current template of editing, then continue to read the variable information among the variableList.

4. if current template of editing is then at first set up corresponding BPEL Document, promptly set up complete BPEL tree.

5. according to the variable routing information of preserving in the template, navigate to variable or the position of condition in template that to revise.

6. upgrade the information of BPEL code then.

7. judge whether to also have the variable among the variableList not handle.

8., got back to for the 1st step to circulate if also have variable not handle among the variableList.

9. if the variable among the variableList is all treated, end loop.

After the user had finished development based on the new operation flow of template, obtain this moment was based on the file that includes template that extension tag is finished.The file that obtain this moment is not the BPEL script of standard, can't be deployed in the BPEL execution engine to move.So, the mechanism that this system provides a cover to derive, the flow process that is used for realizing comprising template is converted to the BPEL executable file of standard.The BPEL script that obtains so just can be carried out on the engine at any one BPEL and move.

After the user has finished exploitation based on the operation flow of template, all be in order finally to access an executable BPEL file.The operation flow that this moment, the user need edit oneself exports to the BPEL file, and just the template export function in the calling system generates executable BPEL file.

As shown in Figure 9, the process key step of template derivation is as follows:

1. at first travel through the line in the whole flow process code, the node that all lines are connected all adds among the nodeList, does not have identical node in this nodeList.

2. find the starting point of whole flow process, promptly satisfy the point of such condition simultaneously: the one, itself there is line to link to each other, just as source node, rather than destination node; The 2nd, if ability does not have line to link to each other, it does not have father's node yet.The 3rd, node itself is container activities sequence, is exactly his first child nodes; This sampling point is exactly needed process starting point.

3. read in the node of current locking then.

4. the node of judging current locking is BPEL activity or template.

5., then directly carry out to the continuation of the 8th step if present node is the BPEL activity.

6., then earlier must must extract the BPEL fragment of preserving in the template if present node is a template

7. the retouching operation of preserving during then according to splicing upgrades operation to the BPEL fragment that extracts.Continue to carry out the operation of the 8th step then.

8., all preserve in the BPEL file that this node will be exported to appointment according to the order and the hierarchical relationship of line no matter present node is BPEL activity or template.As the derivation of BPEL action need is itself activity definition and relevant attribute definition.Need derive the BPEL fragment of still having upgraded that defines in the template as template,

9. in the BPEL file, import the wsdl document relevant then with present node, and relevant partnerLink and the definition of variable.

10. check whether in addition node does not export in the BPEL file of appointment,, just prepare to read next node, be circulated back to the continuation of the 3rd step then and carry out if also have.

11. if all nodes are all correctly derived, jump out circulation, finish the process of whole derivation.

This system all provides corresponding checking work for the performance history of this operation flow.

The template extraction stage can carry out the checking of BPEL grammer with relevant wsdl document to the BPEL file as template.Thereby guarantee that it is to begin that template extracts on the basis of a correct flow process.

In the template splicing stage, the checking meeting is carried out the checking of BPEL grammer to the flow process when pre-editing, simultaneously, also can carry out checking semantically in editor's process.As: when the user not to template input or output variable when mating, remind user's complete operation.When template is served as flow process survey starting point, check whether receive or the pick activity that can create example is arranged in the template.

1. create the DOM model (internal memory of promptly setting up the bpel file represents, represents hierarchical relationship between the bpel document element node with tree structure) of bpel file;

2. carry out the mapping of DOM model and EMF model, checking engineering utilization EMF carries out the persistence modeling to the BPEL file, need set up the mapping relations one by one between DOM model and the EMF model;

3. be the INode model with the EMF model conversion, the checking engineering uses tree structure that the bpel file is carried out modeling, and the node of this tree structure is represented with the INode structure.

After the BPEL file is carried out modeling, finish the checking of the grammer of each node in the BPEL model by model being carried out twice traversal (two pass walk), traversal provides the status information of usefulness for traversal for the second time for the first time.Here, validator is configured to the BPEL tree structure, like this, the validator that respective type is all arranged for different node in the BPEL tree, as: for variable VariableValidator is arranged, WhileValidator is arranged, UntilValidator or the like is arranged for the Until structure for the While structure;

The input of validator is the root node (INode type) and the IModelQuery of BPEL model, and output is the array of an Iproblem type, is used for preserving the grammer problem that checking occurs.

IModelQuery is an interface, realizes the checking of following aspect by inquiry

Whether certain BPEL node legal (by returning the node of an INode type);

Whether types of variables mates;

The legitimacy of Xpath expression formula;

The accurate location of problem.

The basic process of checking:

1. initialization operation generates the validator of each model node successively according to the tree structure of BPEL, and they are put among the formation fValidator;

Here, all Validator are generated by factories.

Factories realizes registration in org.eclipse.bpel.validation.model.RuleFactory.

About Validator should be noted that following some:

(1) Validator is at different nodes, and each BPEL node element may need to call a lot of Validator;

(2) factory that creates Validator must realize registration, and each factory must realize that the Ifactory interface finishes establishment and register.

2. first pass travels through

(1) in the visit fValidator formation, obtains the relevant information of each validator;

(2) call the current fCurrentRule that needs execution, it is put into to storehouse fStackRule;

(3) calling Validator utilizes fCurrentRule to carry out the grammer checking.

3. the problem of appearance was put into the array of issue queue IProblem type successively during second time traversal traveled through first pass.

This system is based on that Eclipse developing plug technology realizes, mainly utilizes EMF (EclipseModel Framework) and GEF (Graphical Eclipse Framework) to realize.Wherein EMF is used for finishing the work of modeling, and GEF is used for finishing patterned function.Fig. 2 is the structural drawing of total system design, and this system adopts the mentality of designing of MVC (Model-View-Controller) to realize.

Model layer

Model layer is the basis of total system, provides the graphical and every function of total system needed model, and system has mainly set up two basic models: BPEL model and template model.

The BPEL model

Owing to be on the basis of BPEL, to generate template, at first need BPEL is carried out modeling.In the standard of WS-BPEL2.0, defined the schema of BPEL grammer, this scheme also is based on this and finishes the modeling of BPEL.Owing to used EMF to come modeling, after the schema definition that has imported BPEL, also need in model, increase, support combining of BPEL and web service for the modeling of WSDL.

Template model

Carry out modeling at template, be mainly used to realize encapsulation for the BPEL code, can reusable template thereby make up.Consider the several characteristics of template: repeatability, dirigibility.Need carry out modeling to extracting the BPEL code that uses as template, template model can clearly illustrate " input variable ", " output variable ", " controlled condition " and the information such as " structures " of BPEL template.These all are the places that can mate modification after the BPEL code formation template that extracts,

Key-course

Key-course is that visual in the total system carried out control operation, and realized that the BPEL script is resolved, function that template extraction and encapsulation, Services Combination and new business derive.

BPEL script parsing module

BPEL script parsing module provides the function that the BPEL script is resolved, resolve by XML based on Dom, rely on the EMF model of BPEL, just BPEL script that can will extract the user and the wsdl document that is associated are set up tree shape model, obtain the information of each the BPEL activity in the BPEL script.

Template extracts and package module

After the parse operation of having finished the BPEL script, template extraction and package module are mainly finished the BPEL script fragments of choosing for the user and are extracted, by show the structure of whole BPEL to the user, select the BPEL logic that need extract and encapsulate from main separation by the user then.After determining the BPEL code that extracts, package module can generate template according to existing Template Schema encapsulation, is saved in the template base.

The Services Combination module

The Services Combination module is mainly used to finish the combination operation to template.When using template on stream, need handle accordingly, mainly carry out following certain operations the interface that template encapsulates:

1. all input variables that define in the docking port are carried out corresponding assign operation.

2. so the condition that defines in the docking port is carried out the corresponding operation of reseting.

3. provide basic activity and the structured activities of BPEL to help form assembly, and operation.

The Services Combination module also provides the visual interactive interface based on BPEL to make things convenient for the user to finish above operation.Analyze which variable of existence in the flow process of editing now, it is displayed, can edit these variablees efficiently and finish interactive operation with tree structure.

New business derives module

New business derives module and is mainly used to the operation flow that has editted is derived the executable BPEL script of generation.The user finishes the BPEL script that the file that obtains behind the pattern development of new business is not a standard, just needs new business to derive the conversion work that module is accomplished to the BPEL script.Mainly finish the analysis to graphical file, obtain a series of effective nodes, simultaneously the effective information that comprises in the template is wherein extracted, last is saved in the BPEL script.

The UI layer

The UI layer mainly is the visual part of total system, has mainly realized functions such as palette, editor, properties view, outline view and guide view.

Palette

Palette is mainly used to show activity and the template that is used for path combination, is graphical editor's starting point here.

Having two parts in the palette forms: the template in BPEL activity and the template base.So when opening patterned editing interface at every turn, palette all can finish with template base synchronously with new operation.

1. read template base

2. all templates in the traversal template base

3. in palette, demonstrate all templates,, or deleted out-of-date template, can both in palette, keep upgrading if template base has been added new template.

Editor

Editor is mainly used to carry out editor's combination of flow process.When from palette, choosing a BPEL activity or template, be dragged in the editor then.Here can be with BPEL movable and template the two combine and carry out the exploitation of service logic.

Properties view

Property window is mainly used to be presented at the attribute of the activity of icon representative selected in the editor, when not choosing any icon, and the relevant information of property window display background.

Outline view

Outline view mainly shows the simple information and the level relation of inclusion of activities all in the current window.

The guide view

This system has mainly realized two guide views, and one is import wizard, and another is to derive guide.Import wizard is used for finishing the user interactions of the extraction process of template, finally realizes the encapsulation and the preservation of template.Derive guide and be used for finishing the user interactions that new operation flow exports to executable BPEL script, have the user to formulate the target directory and the filename of derivation, and the file of deriving is saved in assigned catalogue with the specified file name.

The checking layer

The major function of checking layer is in the different phase of system flow the associative operation in the system to be carried out necessary checking work.Mainly be to implement corresponding checking work over against three phases: template extraction, form assembly and template derive, and then also are that corresponding checking work is carried out in the operation at all levels of system: operations such as modelling, the parsing of BPEL script, template extraction, Services Combination and new business generation.

The above embodiment is the preferred embodiment that proves absolutely that the present invention lifts, and protection scope of the present invention is not limited thereto.Being equal to that those skilled in the art are done on basis of the present invention substitutes or conversion, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.

Claims

In the service-oriented development environment based on the multiplexing method of the BPEL sub-process of template mechanism, it is characterized in that, may further comprise the steps:

A. generate the template step: the structure of resolving the BPEL flow process, multiplexing BPEL sub-process need be carried out in the instruction location that receives the user, extract the user then and need multiplexing BPEL sub-process, template model according to definition encapsulates sub-process, and provide the interface definition of encapsulation rear pattern plate, at last the template that generates is saved in the local template base;

B. rigging step: the template in the template base is loaded in editor's development environment of operation flow, and keeps upgrading synchronously, and butt joint for the interface of template is provided with template base; Template is carried out corresponding BPEL grammer checking and template related check;

C. derive the template step: the BPEL operation flow that will contain the template extension tag is converted to the executable BPEL of standard, comprise the variable in the BPEL template that has encapsulated that to call, conditional parameter carries out instantiation according to the parameter in the interface conversion, obtain meeting the BPEL fragment of idiographic flow requirement, replenish complete BPEL flow process then, obtain executable standard BP EL flow process.
2. realize the multiplexing method of BPEL sub-process based on template mechanism in the service-oriented development environment according to claim 1, it is characterized in that described steps A specifically comprises:

A1. the BPEL file is resolved;

A2. set up the tree structure of BPEL, and this structure is offered graphical display module;

A3. graphical display module is showed whole BPEL with the mode of optional multiway tree hierarchical structure is known and is expressed the level relation of inclusion of node, title, type and the association attributes of node to the user;

A4. the user chooses from the BPEL of institute tree structure oneself needs to extract the part that is encapsulated into template;

A5. the BPEL snippet extraction of the user being chosen comes out to be saved in the template, and simultaneously that this BPEL fragment is relevant attribute information and WSDL information all extract in the lump;

A6. show in the BPEL fragment of extracting, need the user to carry out interface operable information, comprise input variable, output variable and controlled condition, be saved in the template file, and the template that obtains is saved in the template base.
3. realize the multiplexing method of BPEL sub-process based on template mechanism in the service-oriented development environment of stating according to claim 2, it is characterized in that, in the described steps A 1 the BPEL file resolved and comprise:

A) read the user and specify the BPEL file that carries out the template extraction, resolve, at first create the BPEL document object by XML;

B) according to the wsdl document that is associated of user's appointment, cooperate when resolving the BPEL file, obtain the wsdl document information of being introduced, message, the partnerLinkType in the extraction wsdl document and the information of portType element are preserved;

C) adopt recursive mode to travel through the tree structure of whole BPEL file, resolve each BPEL activity, extract variable, partnerLinkType and portType attribute for the BPEL basic activity and add in the template and preserve; For the BPEL container activities, if there is controlled condition, the property value that extracts its condition adds in the Template Information preserves.
4. realize the multiplexing method of BPEL sub-process based on template mechanism in the service-oriented development environment according to claim 3, it is characterized in that in the described steps A 6, the input variable and the output variable of described displaying obtain in the following manner:

At first, find out all variablees in the multiplexing BPEL sub-process.Guarantee when the interface of encapsulation template, the phenomenon of losing of variable can not occur;

Then, input variable set and output variable set in the sub-process are determined in all activities in the traversal sub-process;

At last, remove the public variable in two set, the input variable and the output variable of required definition when obtaining the encapsulation of described BPEL template.
5. realize the multiplexing method of BPEL sub-process based on template mechanism in the service-oriented development environment according to claim 4, it is characterized in that in the described steps A, the encapsulation of template specifically comprises:

The BPEL fragment that parsing extracts is analyzed and is obtained all BPEL activities that it comprises, and each BPEL activity all is saved among the node listing nodeList.

Read BPEL activity current among the nodeList, judge the basic activity that this BPEL activity is BPEL, or the container activities of BPEL, if the BPEL basic activity extracts each variable in the BPEL basic activity; If the container activities of BPEL, then continue to judge whether this container activities contains controlled condition, if comprise controlled condition in this container activities, earlier controlled condition is extracted and be saved in the template, path with the controlled condition place also is saved in the template then, judge in the controlled condition extract whether contain variable,, all variablees are parsed be saved in the input variable tabulation if having; If no, the variable analysis of end node; If do not comprise controlled condition in the container activities, judge again whether this container activities is the scope activity, if, judge in this scope activity and whether defined local variable, if defined local variable, then all local variables are saved in the output variable, if do not define local variable, the variable analysis of end node in the scope activity.
6. realize the multiplexing method of BPEL sub-process based on template mechanism in the service-oriented development environment according to claim 5, it is characterized in that described step B specifically comprises:

Read Template Informations all in the template base, and import in the graphical interfaces display panel;

The user is selection activity or line from described graphical interfaces display panel, if what the user selected is movable, what judge user's selection is BPEL activity or template, if BPEL activity, the icon that in editor, shows this BPEL activity earlier, by the user attribute of the BPEL activity added is provided with then: if the BPEL basic activity,, and then create the variable relevant for this activity with importing for the partnerLink of its dependence is created or imports in this activity; If what the user selected is container activities, this container activities has controlled condition to need to specify simultaneously, adds corresponding controlled condition by the user;

If the user has selected template, at first indicating template icon in editor extracts the information of preserving in the template file, imports wsdl document, partnerLink and variable that this template relies on;

If what the user selected is line, specified the source and target of this line by the user, on editor, demonstrate line, judge whether the destination node of line this moment is template, if, by the user is the input variable that template is selected coupling, or add the controlled condition of coupling for template, and preserve the retouching operation that the user makes for template, judge whether the user also continues to edit flow process, if repeat above-mentioned process; If not, preservation is withdrawed from.
7. realize the multiplexing method of BPEL sub-process based on template mechanism in the service-oriented development environment according to claim 6, it is characterized in that the user finishes the template interface interactive operation and preserves when withdrawing from, trigger following operation:

Read the variable information among the variable list variableList, and obtain the Template Information at certain node place;

Whether the template of judging this node place is current template of editing, if not, continue to read the variable information among the variableList; If at first setting up corresponding BPEL file is complete BPEL tree, according to the variable routing information of preserving in the template, navigates to variable or the position of condition in template that will revise, upgrades the information of BPEL code then,

Judge whether also have variable not handle among the variableList,, to read untreated variable and carry out above-mentioned processing if having; If no, end loop.
8. realize the multiplexing method of BPEL sub-process based on template mechanism in the service-oriented development environment according to claim 7, it is characterized in that described step C specifically comprises:

C1. at first travel through the line in the whole flow process code, the node that all lines are connected all adds among the nodeList, does not have identical node in this nodeList; Find the starting point of whole flow process, read in the node of current locking then;

C2. the node of judging current locking is BPEL activity or template;

If C3. present node is the BPEL activity, forward step C4 to; If present node is a template, extract the BPEL fragment of preserving in the template, the retouching operation of preserving during then according to splicing upgrades operation to the BPEL fragment that extracts, and forwards step C4 to;

C4. preserving in the BPEL file that this node is exported to appointment according to the order and the hierarchical relationship of line, is itself activity definition and relevant attribute definition what derive when movable for BPEL; For template the time, derive the BPEL fragment of still having upgraded that defines in the template;

C5. in the BPEL file, import the wsdl document relevant with present node, and relevant partnerLink and the definition of variable;

C6. judge whether that node does not export in the BPEL file of appointment in addition, if having, read next node, execution in step C2～C5; If no, jump out circulation, finish the derivation process.
9. realize the multiplexing system of BPEL sub-process based on template mechanism in the service-oriented development environment, it is characterized in that, comprising:

BPEL script parsing module, be used for the BPEL script is resolved, resolve, rely on the EMF model of BPEL by XML based on Dom, BPEL script that will extract the user and the wsdl document that is associated are set up tree shape model, obtain the information of each the BPEL activity in the BPEL script;

Template extracts and package module, analysis result according to described BPEL script parsing module, the BPEL script fragments that is used for the user is chosen extracts, and by show the structure of whole BPEL to the user, is selected the BPEL logic that need extract and encapsulate by the user; After determining the BPEL code that extracts, generate template according to existing Template Schema encapsulation, be saved in the template base;

The Services Combination module is used to develop the BPEL operation flow and merges template mechanism, finishes the exploitation to operation flow; Finish the combination operation to template, comprising: all input variables that define in the docking port are carried out assign operation accordingly; All controlled conditions that define in the docking port are reseted operation accordingly; Provide basic activity and the structured activities of BPEL to help form assembly and operation.
10. realize the multiplexing system of BPEL sub-process based on template mechanism in the service-oriented development environment according to claim 9, it is characterized in that, also comprise:

New business derives module, be used for the operation flow that has editted is derived the executable BPEL script of generation, comprise:, obtain a series of effective nodes the analysis of graphical file, simultaneously the effective information that comprises in the template is wherein extracted, last is saved in the BPEL script.