CN101777004B

CN101777004B - Method and system for realizing BPEL sub-process multiplexing based on template in service-oriented environment

Info

Publication number: CN101777004B
Application number: CN 201010101686
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: 2013-01-02
Anticipated expiration: 2030-01-26
Also published as: CN101777004A

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

In the Services Composition 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 known as 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, the 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 engine and the development environment of supporting BPEL script graph with it.But in numerous execution engines and pattern development environment, lack all the time flexibly perfect solution of a cover for the multiplexing mechanism of BPEL script, most systems only provide the part support, and it is large 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 very multiple services logic and function to be reused 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 is inner, between different solutions, also all can possess own distinctive logical design for same business, and this just means that system also will to the enough independences of user, it can be carried out from main control multiplexing logic.

And, owing to the complicacy of system and the change of current demand etc. 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 again the complicacy on flowage structure and level, make troubles.

Therefore, existing BPEL application facet exists some shortcomings: at first, the exploitation of BPEL flow process is larger to the dependence of concrete actual scene, need to use the development block design of atomic size to realize new flow process for different business scenarios, lacks certain dirigibility; Secondly, at present the exploitation of BPEL lacked the complete multiplexing mechanism of a cover, existing BPEL Designer only provides the BPEL basic activity, causes like this workload of overlapping development very large, at present, for 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 preset general operation flow template in the industry, thereby greatly 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 to be carried out in the instruction location that receives the user, then extract the user 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 with template base, and docking for the interface of template is provided; 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, then replenish complete BPEL flow process, 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 show whole BPEL with the mode of optional multiway tree hierarchical structure to the user, know and express the level relation of inclusion of node, title, type and the association attributes of node;

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 out is saved in the template, and attribute information and the WSDL information that this BPEL fragment is relevant all extracts in the lump simultaneously;

A6. show that the interface message that needs the user to operate comprises input variable, output variable and controlled condition, is saved in the template file, and the template that obtains is saved in the template base in the BPEL fragment of extracting.

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 by XML, at first create the BPEL document object;

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 introducing, message, the partnerLinkType in the extraction wsdl document and the information of portType element are preserved;

C) adopt the mode of recurrence to travel through the tree structure of whole BPEL file, it is movable to resolve each BPEL, extracts variable, partnerLinkType and portType attribute for the BPEL basic activity and adds 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, 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 Loss 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, input variable and the output variable of required definition when obtaining described BPEL template encapsulation.

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 is saved among the node listing nodeList.

It is movable to read BPEL current among the nodeList, judges 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, first controlled condition is extracted and be saved in the template, then the path with the controlled condition place also is saved in the template, judge in the controlled condition extract whether contain variable, if having, all variablees are parsed be saved in the input variable tabulation; If no, the variable analysis of end node; If do not comprise controlled condition in the container activities, whether scope is movable to judge this container activities again, 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 user selection is movable, what judge user selection is BPEL activity or template, if BPEL is movable, the icon that in editor, shows first this BPEL activity, then by the user attribute of the BPEL activity added is arranged: if the BPEL basic activity, for this activity creates or import the partnerLink of its dependence, and then create the variable relevant with importing for this activity; If user selection is container activities, this container activities has controlled condition to need to specify simultaneously, by controlled condition corresponding to user add;

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

If user selection is line, specified the source and target of this line by the user, demonstrate line at editor, judge whether the destination node of line this moment is template, if, be the input variable of stencil-chosen coupling by the user, 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 editing process, if so, 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 so, the BPEL file that model is corresponding 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, then upgrades the information of BPEL code,

Judge whether also have variable not process among the variableList, if having, to read untreated variable and carry out above-mentioned processing; 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, then read in the node of current locking;

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

If C3. present node is that BPEL is movable, forward step C4 to; If present node is 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 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 by the XML based on Dom, rely on the EMF model of BPEL, the 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, by showing the structure of whole BPEL to the user, and the BPEL logic that need to extract and encapsulate by user selection; After determining the BPEL code that extracts, generate template according to existing Template Schema encapsulation, be saved in the template base;

The Services Composition module is used for exploitation 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 accordingly assign operation; 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: to the analysis of 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.

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 well be controlled; Can comprise simultaneously the developing business processes that BPEL flow process and template merge 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 executable, as to meet standard WS-BPEL script, can carry out engine at different BPEL and move; Can be good at generating its required template according to user's demand, perhaps the general service flow template in the 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 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 universal flow 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 engine at all general BPEL and move.

As shown in Figure 1, then the present invention is deposited in the template base 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 efficient development scheme.After finishing the editor of flow process, system can export to the flow process that edits executable BPEL file, and the encapsulation that increases for the BPEL fragment before removing is accomplished to the conversion of BPEL script.In addition, whole system also provides complete authentication mechanism, can extract template, template assembling and template derive these several parts 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 to 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 to carry out definition and the description work of similar function interface to 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 the self information when front template, such 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 design 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 namely template extraction.When exploitation BPEL flow process, especially when the flow process of exploitation industry domain-specific, 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 then the system's wsdl document that can automatically resolve this BPEL flow process and be associated is set up BPEL and WSDL model.Then the total with the BPEL flow process all shows the user with patterned tree structure.Can select user at this moment the own multiplexing BPEL logic that needs, allow system carry out extraction and the encapsulation of template, generate the interested template of user, or the user creates the interior general operation flow template of own industry, then be saved in the template base.

This system provides good dirigibility and customization, can allow the user use the template base of this system made 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 by XML, at first create BPEL Document object.

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

C) mode of employing recurrence travels through the tree structure of whole BPEL file, resolves each BPEL activity.So the BPEL basic activity being extracted the 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 receiving request, use hierarchical structure that the mode of optional multiway tree shows whole BPEL to 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 such as condition or variable etc.

4. then, the user is for 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 out is saved in the template.Simultaneously, the attribute information and the WSDL information that this section BPEL code are associated all extract in the lump.

6. show that the interface message that needs the user to operate mainly comprises input variable, output variable and controlled condition in the BPEL fragment of extracting.The user can also to the note of each variable and condition interpolation oneself, use this template with the user who makes things convenient for other this moment.

7. then, with the BPEL fragment, the information such as the 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 namely uses at the BPEL sheet intersegmental part that extracts, the flow process outer with fragment do not have anything to contact.Remaining part is exactly to encapsulate the input variable that needs in the template in the input set, and remaining part is exactly to encapsulate the variable that will export in the 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 is saved among the nodeList.

2. if nodeList is not empty, enter circulation.It is movable to read BPEL 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. if the BPEL activity of this moment is the BPEL basic activity, then begin to extract each variable in the BPEL basic activity.Because different BPEL basic activities is different for the use of variable, so need here to treat respectively.

5. if it is movable that the BPEL basic activity that reads in is invoke, 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 it is movable that the BPEL basic activity that reads in is assign, then extract variable save among the from the assign activity in the input variable tabulation.And then the variable save among the in the extraction assign activity is in the output variable tabulation.

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

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

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

10. if it is movable that the BPEL basic activity that reads in is onEvent, 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, condition is extracted be saved in the template first, then the path with the controlled condition place also will be saved in the template.

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

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

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

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

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

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.Such user's multiplexing template that has extracted easily just.Be variable information and controlled condition relevant on the template definition of oneself, cooperate simultaneously upper BPEL activity to carry out control and the completion of template, 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 flexibly business development mode 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.Then the user can repeatedly pull BPEL activity or template that need to use and enter editor, determines relation between each activity by line.Come mutual between completion 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 editing process, therefore pulls an icon from palette in editor.What at this moment, need to judge user selection is the icon of activity or the line of selection.

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

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

5. then the user need to arrange accordingly to the attribute of the BPEL activity added.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 user selection 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. if the user does not select BPEL movable, but selected to add a template.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 at 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 stencil-chosen coupling this user, also can add for template the controlled condition of coupling.System preserves the retouching operation that the user makes for template.

13. whether the user also continues editing 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 to 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, the BPEL Document that then model is corresponding namely sets 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. then upgrade the information of BPEL code.

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

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

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 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 to edit oneself exports to the BPEL file, and namely 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, namely satisfy simultaneously the point of such condition: 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 node; This sampling point is exactly needed process starting point.

3. then read in the node of current locking.

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

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

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

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

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

9. then in the BPEL file, import the wsdl document relevant 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, if also have, just prepare to read next node, then be circulated back to the continuation of the 3rd step and carry out.

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 on the basis of a correct flow process that template extracts.

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: as user during not to the inputing or outputing variable and mate of template, the reminding user complete operation.Whether when template is served as flow process survey starting point, check has receive or the pick that can create example movable in the template.

1. create the DOM model (internal memory of namely 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 to set up the one by one mapping relations between DOM model and the EMF model;

3. be the INode model with the EMF model conversion, the checking engineering uses tree structure the bpel file to be carried out modeling, the node of this tree structure INode representation.

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 arranged for different node in the BPEL tree, as: for variable VariableValidator is arranged, for the While structure WhileValidator is arranged, for the Until structure UntilValidator etc. is arranged;

The input of validator is 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 for 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 access 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 Eclipse developing plug technology and 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 whole 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 whole system, provides whole system the graphical and needed model of various functions, and system has mainly set up two basic models: BPEL model and template model.

The BPEL model

Owing to be to generate template on the basis of BPEL, 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 the combination of BPEL and web service for the modeling of WSDL.

Template model

Carry out modeling for template, be mainly used to realize the encapsulation for the BPEL code, can reusable template thereby make up.Consider several characteristics of template: repeatability, dirigibility.Need to 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 whole system carried out control operation, and realized that the BPEL script is resolved, function that template extraction and encapsulation, Services Composition and new business derive.

BPEL script parsing module

BPEL script parsing module provides the function that the BPEL script is resolved, resolve by the XML based on Dom, rely on the EMF model of BPEL, the BPEL script that just 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, then select the BPEL logic that need to extract and encapsulate from main separation by the user.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 Composition module

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

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 Composition 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, with tree structure it is displayed, can edit efficiently these variablees and finish interactive operation.

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 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 whole system, has mainly realized the functions such as palette, editor, properties view, outline view and guide view.

Palette

Palette is mainly used to show activity and the template 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, palette all can be finished with following newly synchronously of template base and operate at every turn.

1. read template base

2. all templates in the traversal template base

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

Editor

Editor is mainly used to carry out editor's combination of flow process.When from palette, choosing a BPEL activity or template, then be dragged in the editor.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 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 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 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: the operations such as model foundation, the parsing of BPEL script, template extraction, Services Composition 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 to this.Being equal to that those skilled in the art do 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

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

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, then replenish complete BPEL flow process, obtain executable standard BP EL flow process;

Wherein, described steps A specifically comprises:

A1. the BPEL file is resolved;

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

3. realize the multiplexing method of BPEL sub-process based on template mechanism in the service-oriented development environment according to claim 2, it is characterized in that in the described steps A 6, 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 Loss of variable can not occur;

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, 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 is saved among the node listing nodeList;

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 described step B specifically comprises:

If user selection is line, specified the source and target of this line by the user, demonstrate line at editor, whether the destination node of judging line this moment is template, if, be the input variable of stencil-chosen coupling by the user, or add the controlled condition of coupling for template, preserve the retouching operation that the user makes for template, judge whether the user also continues editing process, if so, repeat above-mentioned user selection activity or link to and judge whether the user also continues the process of editing process from described graphical interfaces display panel; If not, preservation is withdrawed from.

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

Judge among the variableList whether to also have variable not process, if having, to return the variable information that reads among the variable list variableList, and the step of obtaining the Template Information at certain node place circulates; If no, end loop.

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 described step C specifically comprises:

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

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.

8. realize the multiplexing system of BPEL sub-process based on template mechanism in the service-oriented development environment, it is characterized in that, comprising:

Generate formwork module, be used for resolving the structure of BPEL flow process, multiplexing BPEL sub-process need to be carried out in the instruction location that receives the user, then extract the user 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;

The rigging module is used for the template of template base is loaded in editor's development environment of operation flow, and keeps upgrading synchronously with template base, and the docking for the interface of template is provided; Also be used for template is carried out corresponding BPEL grammer checking and template related check;

Derive formwork module, be converted to the executable BPEL of standard for the BPEL operation flow that will contain the template extension tag, 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, then replenish complete BPEL flow process, obtain executable standard BP EL flow process;

Wherein, described generation formwork module specifically comprises:

For the device that the BPEL file is resolved;

Be used for setting up the tree structure of BPEL, and this structure offered the device of graphical display module;

Be used for making hierarchical structure that graphical display module shows whole BPEL with the mode of optional multiway tree to the user, know the device of title, type and the association attributes of the level relation of inclusion of expressing node, node;

Be used for choosing the device that oneself needs to extract the part that is encapsulated into template from the BPEL of institute tree structure for the user;

The BPEL snippet extraction that is used for the user is chosen out is saved to template, the device that the attribute information of simultaneously this BPEL fragment being correlated with and WSDL information all extract in the lump;

The BPEL fragment of be used for to show extracting, the interface message that needs the user to operate comprises input variable, output variable and controlled condition, is saved in the template file, and the template that obtains is saved in device in the template base.