CN101645935B - Web service combined method based on QoS indexes and Web service output parameters and device thereof - Google Patents
Web service combined method based on QoS indexes and Web service output parameters and device thereof Download PDFInfo
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Abstract
The invention provides a Web service combined method based on QoS indexes and Web service output parameters. The method comprises the following steps: reading Web service combinational rule from a memory, wherein presetting the Web service combinational rule according to required QoS indexes and Web service output parameters; analyzing the read Web service combinational rule; selecting a group of Web service combination from candidate Web services; using a Web service combination engine to acquire the QoS indexes of each Web service in the selected Web service combination; acquiring the output parameters of each Web service in the selected Web service combination on the basis of reflective technology; judging whether the acquired QoS indexes and/or Web service output parameters of each Web service meet the Web service combinational rule or not to determine whether the selected Web service combination is the required Web service combination, wherein when the QoS indexes and Web service output parameters of each acquired Web service both meet the Web service combinational rule, determining the Web service combination to be the required Web service combination.
Description
Technical field
The present invention relates to the network service field, relate in particular to a kind of Web service combined method and device based on QoS index and Web service output parameter.
Background technology
The increasing easy-to-use Web share service of stablizing has appearred in increasingly mature along with Web service technology on network.But; Since single Web service the function that can provide limited; Therefore in order to utilize the Web service of sharing more fully, be necessary the Web service of sharing is integrated, think that the user provides more powerful service function; Accelerate the speed of system development, and meet consumers' demand fast.Web service is integrated, be commonly referred to the Web service combination in the art.
In the prior art, have two kinds of Web service combined methods usually: the static Web service combined method and the Web service method of unalterable rules.
Static Web service combined method is a kind of Web service combined method of being confirmed the Web service combination by the user.In the Web service combined method of static state, each Web service in the Web service combination is to be confirmed well in advance by the user, can't correspondingly change according to the variation of the specific targets of Web service.That is to say that in this static Web service combined method, user's demand must be to confirm in advance, and can not dynamically change.
The Web service combined method of unalterable rules is a kind of Web service combined methods based on unalterable rules.In the Web service combined method of these unalterable rules, said unalterable rules are only considered the Qos index usually, and do not consider the output of Web service, and it can describe user's demand through the method for each Qos index being carried out weighting.
Yet under a lot of situations, user's demand normally dynamically changes; Under the situation that supplies a plurality of users to use in same set of system; Because each user's demand maybe be different, therefore when different users used, user's demand dynamically changed usually.And under many circumstances, the output of Web service is only the problem that the user is concerned about most.Obviously, at the existing Web service combining method, the problems referred to above all can not be resolved.
Therefore, need a kind of Web service combined method and device, make up dynamically to carry out Web service according to user's demand, and satisfy the output requirement of Web service based on QoS index and Web service output parameter.
Summary of the invention
In view of the above problems; A kind of Web service combined method based on QoS index and Web service output parameter is provided; It sets the Web service rule of combination based on QoS index and Web service output parameter; To one group of Web service combination from candidate's Web service, selecting; Obtain the QoS index and the Web service output parameter of each Web service in the selected one group of Web service combination that goes out, and judge whether the QoS index or the Web service output parameter that are obtained satisfy the Web service rule of combination that sets, to confirm whether the selected one group of Web service combination that goes out is required Web service combination.Thus, can dynamically carry out the Web service combination according to user's demand, and can satisfy the output requirement of Web service.
According to an aspect of the present invention; A kind of Web service combined method of being carried out by the Web service composite set based on QoS and Web service output is provided; Said Web server composite set comprises memory cell, is used to store the Web service rule of combination, and said method comprises:
From said memory cell reading Web service combinational rule, wherein said Web service rule of combination be based on the required QoS index of user and the Web service output parameter predefined;
Web service rule of combination to being read is resolved;
From candidate's Web service, select one group of Web service combination;
Utilize the Web service combine engine to obtain the QoS index of each Web service in selected one group of Web service combination;
Obtain the output parameter of each Web service in selected one group of Web service combination based on reflection technology;
Whether whether QoS index and/or the Web service output parameter of judging each Web service of being obtained satisfy the Web service rule of combination that is parsed, be required Web service combination to confirm selected one group of Web service combination,
Wherein, when the QoS of each Web service that is obtained index and Web service output parameter all satisfied the Web service rule of combination that is parsed, selected one group of Web service combination was confirmed as required Web service combination.
According to a further aspect in the invention, a kind of Web service composite set based on QoS and Web service output is provided, has comprised:
Memory cell is used to store the Web service rule of combination, wherein said Web service rule of combination be based on needed QoS index and the Web service output parameter predefined;
Reading unit is used for reading said Web service rule of combination from said memory cell;
Resolution unit is used for the Web service rule of combination that is read is resolved;
Selected cell is used for selecting one group of Web service combination from candidate's Web service;
QoS index acquiring unit is used for utilizing the Web service combine engine to obtain the QoS index of each Web service of selected one group of Web service combination;
The output parameter acquiring unit is used for obtaining based on reflection technology the output parameter of each Web service of selected one group of Web service combination;
Whether confirm the unit, be used to judge whether the QoS index of each Web service of being obtained and/or Web service output parameter satisfy the Web service rule of combination that is parsed, be required Web service combination to confirm selected one group of Web service combination,
Wherein, when the QoS of each Web service that is obtained index and Web service output parameter all satisfied the Web service rule of combination that is parsed, selected one group of Web service combination was confirmed as required Web service combination.
Through with reference to below in conjunction with the explanation of accompanying drawing and the content of claims, and along with to more complete understanding of the present invention, other purposes of the present invention and result will understand more and reach easy to understand.
Description of drawings
Below will combine accompanying drawing and specific embodiment to describe the present invention, wherein:
Fig. 1 shows according to an embodiment of the invention the flow chart of being carried out by the Web service composite set based on the Web service combined method of QoS index and Web service output parameter; And
Fig. 2 shows the block diagram based on the Web service composite set of QoS and Web service output parameter according to one embodiment of the invention.
Identical label is indicated similar or corresponding feature or function in institute's drawings attached.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Fig. 1 shows the flow chart of being carried out by the Web service composite set based on the Web service combined method of QoS index and Web service output parameter according to an embodiment of the invention.
As shown in Figure 1, at step S110, specify the Web service gang form that is used to carry out the Web service combination.Said Web service gang form is the abstract definition to the Web service in the Web service anabolic process.Said Web service gang form comprises a plurality of service moulding plates, and each service moulding plate can comprise a plurality of candidates' Web service.
After the appointment of accomplishing the Web service gang form, flow process proceeds to step S120.At step S120, reading Web service combinational rule from the memory cell of said Web service composite set, wherein said Web service rule of combination is based on the output parameter of QoS index and Web service of required Web service and is predefined.
According to an aspect of the present invention, said Web service rule of combination can be based on to the required Web service QoS index of specified Web service template and Web service output parameter and predefined.According on the other hand, also can not need to specify the Web service gang form specially, set said Web service rule of combination and be based on required Web service QoS index and the Web service output parameter of using the Web service template always.
Said Web service rule of combination is a kind of expression of user's request.In the present invention, the said Web service rule of combination logical expression that is QoS index and Web output parameter.Usually, the QoS index of said Web service comprises availability, response time, expense and reliability.Said Web service output parameter for example comprises commodity price etc.
To set said Web service rule in order understanding better to export, to describe with an instantiation below based on the QoS index of Web service and Web service.
For example, in a Web service template that comprises 3 Web services, the Qos index is defined as Q11, Q12, Q13, Q21, Q22, Q23, Q31, Q32, Q33 respectively.Wherein, Q11 is first Qos index of first Web service, and it represents the availability of first Web service; Q12 is second Qos index of first Web service, and it represents the response time of first Web service; Q13 is the 3rd a Qos index of first Web service, and it represents the reliability of first Web service.Similarly, Q21 is first Qos index of second Web service, and it represents the availability of second Web service; Q22 is second Qos index of second Web service, and it represents the response time of second Web service; Q23 is the 3rd a Qos index of second Web service, and it represents the reliability of second Web service.Q31 is first Qos index of the 3rd Web service, and it represents the availability of the 3rd Web service; Q32 is second Qos index of the 3rd Web service, and it represents the response time of the 3rd Web service; Q33 is the 3rd a Qos index of the 3rd Web service, and it represents the reliability of the 3rd Web service.
The output of Web service is expressed as O11, O12, O21, O22, O23.Wherein O11 represents first parameter of first Web service, and O23 represents the 3rd output parameter of the 2nd Web service.
Can come the following Web service rule of combination of setting based on QoS index and Web service output parameter:
Q12+Q22+Q32＜100&&O22＜5, the overall response time of its expression Web service combination and less than the 2nd parameter (possibly be quofed rice of commodities) of 100 and the 2nd Web services less than 5.
Be noted that said Web service rule of combination is predefined, and be stored in the memory cell of said Web service composite set, for using in the future.In addition, said Web service rule of combination can also dynamically upgrade through revising QoS index and/or Web service parameter and logical relation thereof as required.
After reading said Web service rule of combination from said memory cell, flow process proceeds to step S130.At step S130, the Web service rule of combination that is read is resolved.Usually, the Web service rule of combination that is read is a character string.Can adopt the method for syntax analysis, syntactic analysis to come the Web service rule of combination (for example, character string) that is read is resolved, to parse QoS index name, Web service output title, logical relation etc.For example, can accomplish parsing through in program, embedding Lua to the Web service rule of combination.Should be appreciated that, can also adopt other suitable method to come the Web service rule of combination that is read is resolved.
After parsing the Web service rule of combination, flow process proceeds to step S140.In step S140, from candidate's Web service, select one group of Web service combination, for example can select one group of Web service combination through enumeration method.Should be appreciated that, can also adopt other suitable method to select the Web service combination.
After choosing one group of Web service combination, flow process proceeds to step S150.At step S150, utilize existing Web service combine engine to accomplish the Web service anabolic process, to obtain the QoS index of Web service.For example, can adopt Web service combine engine BPEL at present commonly used to carry out the Web service anabolic process, the operation result through the BPEL engine calculates and adds up and obtains the QoS index.For example; Comprise under the situation of availability, response time, expense and reliability in the QoS index of being considered; Availability and response time can called the acquisition of end back, and expense can obtain when service discovery, and reliability can obtain according to historical record and this operation result of this locality.
Here, be noted that before carrying out the Web service combination, need carry out service discovery to the Web service in the Web service combination usually, and the result of service discovery is stored in the memory cell of said Web service composite set.
In addition, should be appreciated that, make up when obtaining the QoS index carrying out Web service the user can select whether to carry out that QoS obtains and service discovery according to its operational environment.If the Web service in selected one group of Web service combination is stable or qos requirement is not high; Promptly; If it is not frequent that said candidate's Web service and QoS index thereof change, then do not need all to carry out service discovery at every turn, and only need carry out service discovery first; And the result of service discovery is stored in the memory cell of said Web service composite set first, from the memory cell of said Web service composite set, reads the result of the service discovery of being stored first subsequently at every turn.But, under the situation that Web service is unstable or qos requirement is very high in selected one group of Web service combination, that is, if said candidate's Web service frequent variations or QoS index frequent variations then need all to carry out service discovery at every turn.According to aforesaid way, can under the situation of the accuracy that the guaranteed qos index is obtained, shorten and obtain the needed time of QoS index.
After the QoS index that obtains Web service, flow process proceeds to step S160.At step S160, the requirement of the QoS index that is comprised in the QoS index of the Web service that is obtained and the Web service rule of combination that is parsed is compared.If the requirement that the QoS index does not satisfy said Web service rule of combination that obtains then turns back to step S140, from said candidate's Web service, select another group Web service combination.
If the QoS index that is obtained satisfies the requirement of said Web service rule of combination, then flow process proceeds to step S170.At step S170, adopt reflection technology to obtain the output parameter value of each the Web service combination in selected one group of Web service combination.Said reflection technology is a kind of can the monitoring and the technology of Adjustment System state and behavior through the system's readme that has a causalnexus with system running state and behavior.Utilize said reflection technology; Can be according to the operation result of Web service combine engine; Obtain middle normally Web service output of describing of service groups and program running result's corresponding relation, thereby in program operation process, obtain the output parameter value of Web service according to the program running result.
Behind the output parameter that obtains said Web service, flow process proceeds to step S180.At step S180, judge whether the output parameter of the Web service that is obtained satisfies the requirement of the Web service rule of combination that is parsed.If the output parameter of the Web service that is obtained does not satisfy the requirement of the Web service rule of combination that is parsed, then turn back to step S140, from said candidate's Web service, select another group Web service combination.
If the output parameter of the Web service that is obtained satisfies the requirement of the Web service rule of combination that is parsed, confirm that then selected one group of Web service is combined as required Web service combination.
Abovely the Web service combined method based on QoS index and Web service output parameter has according to a preferred embodiment of the present invention been described with reference to Fig. 1.But, should be appreciated that, can carry out various modification to the foregoing description.
According to an aspect, can from the foregoing description, delete step S110, that is, before reading the Web service rule of combination of said setting, can not need specify the Web service gang form from said memory cell.
In addition; In the above-mentioned Web service combined method of describing with reference to Fig. 1, at first, carry out said QoS index obtaining step based on a preferred embodiment of the present invention; Carry out the deterministic process whether said QoS index meets the Web service rule of combination then; Under the satisfactory situation of said QoS index, carry out Web service output parameter obtaining step again, whether the output parameter of carrying out said Web service then meets the deterministic process of Web service rule of combination.As the replacement instance, also can after said QoS index obtaining step and Web service output parameter obtaining step, carry out said deterministic process again.Perhaps; Can carry out Web service output parameter obtaining step earlier; Carry out the deterministic process whether said Web service output parameter meets the Web service rule of combination then; Meet under the situation of Web service rule of combination at said Web service output parameter, carry out said QoS index obtaining step again, whether the QoS index of carrying out said Web service then meets the deterministic process of Web service rule of combination.
The above-mentioned Web service combined method that is used for based on QoS index and Web service output parameter of the present invention can adopt software to realize, also can adopt hardware to realize, or adopts way of hardware and software combination to realize.
Fig. 2 shows the block diagram of Web service composite set 200 according to a preferred embodiment of the present invention.As shown in Figure 2, said Web service composite set 200 comprises designating unit 201, reading unit 203, resolution unit 205, selected cell 207, QoS index acquiring unit 209, output parameter acquiring unit 211, confirms unit 213 and memory cell 215.
Said memory cell 215 is used to store the Web service rule of combination, and wherein said Web service rule of combination is based on the output parameter of QoS index and Web service of required Web service and is predefined.
Said designating unit 201 is used to specify the Web service gang form that is used for the Web service combination.Said Web service gang form comprises a plurality of service moulding plates, and each service moulding plate can comprise a plurality of candidates' Web service.
After the appointment of accomplishing said Web service gang form; Said reading unit 203 is from said memory cell 215 reading Web service combinational rule, and said Web service rule of combination is to the required QoS index of specified Web service template and Web service output parameter and predefined.
After reading out said Web service rule of combination, 207 pairs of said Web service rules of combination of said resolution unit are resolved, to parse for example QoS index name, Web service output title, logical relation etc.
After said Web service rule of combination was resolved, said selected cell 207 was selected one group of Web service combination from said candidate's Web service.To selected one group of Web service combination, QoS index acquiring unit 209 and output parameter acquiring unit obtain the QoS index and the Web service output parameter of Web service respectively.After the QoS index and Web service output parameter that obtain Web service; Whether confirm unit 213 judges whether the QoS index and the Web service output parameter of the Web service that is obtained all satisfy the Web service rule of combination, be required Web service combination to confirm selected Web service combination.When the QoS of the Web service that is obtained index and Web service output parameter all satisfy the Web service rule of combination, confirm that selected Web service is combined as required Web service combination.If do not satisfy the Web service rule of combination one of in the QoS index of the Web service that is obtained and the Web service output parameter; Think that then selected Web service combination is not required Web service combination, and said selected cell 207 is selected another group Web service combination from said candidate's Web service.Then, come to confirm again through QoS index acquiring unit 209, output parameter acquiring unit 211 and definite unit 213 whether selected another group Web service combination is required Web service combination.So repeat, till finding required Web service combination.
Here; Be noted that; Said definite unit 213 can be carried out said QoS index respectively and whether satisfy the deterministic process of said Web service rule of combination and the deterministic process whether said Web service output parameter satisfies said Web service rule of combination after QoS index acquiring unit 209 obtain QoS index and output parameter acquiring unit 211 acquisition Web service output parameters.As the replacement instance; The deterministic process whether said QoS index and said Web output parameter all satisfy said Web service rule of combination also can be carried out again in said definite unit 213 after said QoS index acquiring unit 209 obtains QoS index and output parameter acquiring unit 211 acquisition Web service output parameters.In addition, should be appreciated that QoS index acquiring unit 209 obtains the order of the output parameter of QoS index and the 211 acquisition Web services of output parameter acquiring unit and can exchange, and can not influence protection scope of the present invention.
In addition; Said Web service composite set 200 can also comprise service discovery unit (not shown); Be used under the situation of the Web service frequent variations of selected one group of Web service combination or QoS index frequent variations, then service discovery being carried out in the Web service in selected one group of Web service combination.Should be appreciated that Web service and QoS index thereof in selected one group of Web service combination change under the not frequent situation, can not need the service discovery unit.
In addition, said Web service composite set 200 can also comprise Web service rule of combination updating block, is used for as required, dynamically upgrades said Web service rule of combination through revising QoS index and/or Web service parameter and logical relation thereof.
Beneficial effect
Through the above detailed description that combines accompanying drawing to the embodiment of the invention; Be not difficult to find out: utilize Web service combined method provided by the invention and device; Can set the Web service rule of combination based on QoS index and Web service output parameter; To one group of Web service combination from candidate's Web service, selecting; Obtain the QoS index and the Web service output parameter of each Web service in the selected one group of Web service combination that goes out, and judge whether the QoS index or the Web service output parameter that are obtained satisfy the Web service rule of combination that sets, to confirm whether the selected one group of Web service combination that goes out is required Web service combination.Thus, can dynamically carry out the Web service combination according to user's demand, and can satisfy the output requirement of Web service.
But, it will be appreciated by those skilled in the art that Web service combined method and device that the invention described above is proposed, can also on the basis that does not break away from content of the present invention, make various improvement.Therefore, protection scope of the present invention should be confirmed by the content of appending claims.
Claims (13)
1. Web service combined method of exporting based on QoS and Web service of carrying out by the Web service composite set, said Web service composite set comprises memory cell, is used to store the Web service rule of combination, said method comprises:
From said memory cell reading Web service combinational rule, wherein said Web service rule of combination be based on the required QoS index of user and the Web service output parameter predefined;
Web service rule of combination to being read is resolved;
From candidate's Web service, select one group of Web service combination;
Utilize the Web service combine engine to obtain the QoS index of each Web service in selected one group of Web service combination;
Obtain the output parameter of each Web service in selected one group of Web service combination based on reflection technology;
Whether whether QoS index and/or the Web service output parameter of judging each Web service of being obtained satisfy the Web service rule of combination that is parsed, be required Web service combination to confirm selected one group of Web service combination,
Wherein, when the QoS of each Web service that is obtained index and Web service output parameter all satisfied the Web service rule of combination that is parsed, selected one group of Web service combination was confirmed as required Web service combination.
2. the method for claim 1; Wherein, Said determining step occurs in respectively after said QoS index obtaining step and the said Web service output parameter obtaining step, perhaps occurs in after said QoS index obtaining step and the said Web service output parameter obtaining step.
3. according to claim 1 or claim 2 method; Wherein, If do not satisfy the Web service rule that is parsed one of in the QoS index of each Web service of being obtained and the Web service output parameter; Then from said candidate's Web service, select another group Web service combination; And, carry out the QoS index of each Web service that above-mentioned QoS index obtaining step, Web service output parameter obtaining step and said judgement obtain or the step whether the Web service output parameter satisfies the Web service rule of combination again to selected another group Web service combination.
4. the method for claim 1, wherein before said memory cell reading Web service combinational rule, also comprise step:
The specified services gang form,
And comprise the Web service rule of combination that from said memory cell, reads specified service gang form from the step of said memory cell reading Web service combinational rule, wherein said Web service rule of combination is based on to the required QoS index and the Web service output parameter of specified service gang form predefined.
5. according to claim 1 or claim 2 Web service combined method, wherein, said Web service rule of combination can dynamically upgrade through revising QoS index and/or Web service parameter and logical relation thereof as required.
6. Web service combined method as claimed in claim 1; Wherein, In said candidate's Web service and QoS index thereof is not under the situation of frequent variations; Said QoS index obtaining step comprises and from said memory cell, reads the corresponding QoS index of being stored, and need not carry out service discovery, said QoS index of storing be to said candidate service carry out service discovery first and obtain and be stored in the said memory cell.
7. Web service combined method as claimed in claim 1; Wherein, Under the situation of said candidate's Web service frequent variations or QoS index frequent variations, said QoS index obtaining step comprises that serving combination to selected one group carries out service discovery and obtain said QoS index.
8. Web service composite set based on QoS and Web service output comprises:
Memory cell is used to store the Web service rule of combination, wherein said Web service rule of combination be based on needed QoS index and the Web service output parameter predefined;
Reading unit is used for reading said Web service rule of combination from said memory cell;
Resolution unit is used for the Web service rule of combination that is read is resolved;
Selected cell is used for selecting one group of Web service combination from candidate's Web service;
QoS index acquiring unit is used for utilizing the Web service combine engine to obtain the QoS index of each Web service of selected one group of Web service combination;
The output parameter acquiring unit is used for obtaining based on reflection technology the output parameter of each Web service of selected one group of Web service combination;
Whether confirm the unit, be used to judge whether the QoS index of each Web service of being obtained and/or Web service output parameter satisfy the Web service rule of combination that is parsed, be required Web service combination to confirm selected one group of Web service combination,
Wherein, when the QoS of each Web service that is obtained index and Web service output parameter all satisfied the Web service rule of combination that is parsed, selected one group of Web service combination was confirmed as required Web service combination.
9. device as claimed in claim 8; Wherein, Do not satisfy the Web service that is parsed one of in the QoS of each Web service of confirming to be obtained in said definite unit and the Web service output parameter when regular; Said selected cell is selected another group Web service combination from said candidate's Web service; And to selected another group Web service combination, said QoS index acquiring unit, said output parameter acquiring unit and definite unit carry out again that the QoS index is obtained, the Web service output parameter obtains and judge whether the QoS and the Web service output parameter of each Web service of obtaining to selected another group Web service combination all satisfy the Web service rule of combination.
10. device as claimed in claim 8 also comprises designating unit, is used to specify service groups matched moulds plate,
The Web service rule of combination of being stored in the wherein said memory cell is based on to the required QoS index and the Web service output parameter of specified service gang form predefined.
11., also comprise Web service rule of combination updating block like claim 8 or 9 described Web service composite sets, be used for as required, dynamically upgrade said Web service rule of combination through revising QoS index and/or Web service parameter and logical relation thereof.
12. Web service composite set as claimed in claim 8; Wherein, In said candidate's Web service and QoS index thereof is not under the situation of frequent variations; Said QoS index acquiring unit reads the corresponding QoS index of being stored from said memory cell, and need not carry out service discovery, said QoS index of storing be to said candidate service carry out service discovery first and obtain and be stored in the said memory cell.
13. Web service composite set as claimed in claim 8; Wherein, Said QoS index acquiring unit also comprises the service discovery unit; Be used under the situation of said candidate's Web service frequent variations or QoS index frequent variations, selected one group of service combination is carried out service discovery and obtained said QoS index.
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| CN101848242B (en) * | 2010-05-13 | 2012-09-26 | 西北工业大学 | Web service combination method |
| CN103593288B (en) * | 2013-11-06 | 2017-04-05 | 东北师范大学 | A kind of WS BPEL workflow analysis perceives the method for testing of QoS |
| CN103823875B (en) * | 2014-02-28 | 2017-06-27 | 浙江大学 | The search method of Services Composition |
| CN106209978B (en) * | 2016-06-22 | 2019-04-09 | 安徽大学 | Alliance relation service combination selection system and method |
| CN107016077B (en) * | 2017-03-28 | 2020-05-29 | 南京邮电大学 | Optimization method for Web service combination |
| CN110971683B (en) * | 2019-11-28 | 2021-06-15 | 海南大学 | Service combination method based on reinforcement learning |
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| CN1941776A (en) * | 2005-09-29 | 2007-04-04 | 国际商业机器公司 | Method and system of quality of service (QoS) based planning in web services aggregation |
| CN1777190A (en) * | 2005-12-08 | 2006-05-24 | 普天信息技术研究院 | Service quality based web service registration and discovery system and method |
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