CN101645935A - 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 PDF

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CN101645935A
CN101645935A CN200910187232A CN200910187232A CN101645935A CN 101645935 A CN101645935 A CN 101645935A CN 200910187232 A CN200910187232 A CN 200910187232A CN 200910187232 A CN200910187232 A CN 200910187232A CN 101645935 A CN101645935 A CN 101645935A
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web service
combination
qos index
rule
output parameter
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CN101645935B (en
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孙福权
陈廷斌
袁磊
张益民
于茜
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Neusoft Corp
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Neusoft Corp
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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 ofWeb 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 outputparameters 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 Webservice 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 serviceoutput 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

Web service combined method and device based on QoS index and Web service output parameter
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
Easy-to-use Web share service has appearred more and more stablizing in increasingly mature along with the 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 determined 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 determined 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 determine 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, described 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 by the method that each Qos index is weighted.
Yet under a lot of situations, user's demand normally dynamically changes, under situation about using for a plurality of users in same set of system, because each user's demand may 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, at 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 QoS index or the Web service output parameter obtained satisfy the Web service rule of combination that sets, to determine 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, described Web server composite set comprises memory cell, is used to store the Web service rule of combination, and described method comprises:
From described 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;
The Web service rule of combination that is 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 determine 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, provide a kind of Web service composite set, having comprised based on QoS and Web service output:
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 described Web service rule of combination from described memory;
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 determining unit is 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 determine 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.
By the content of reference below in conjunction with the description of the drawings and claims, and along with understanding more comprehensively of the present invention, other purposes of the present invention and result will understand and easy to understand more.
Description of drawings
Describe the present invention below with reference to the drawings and specific embodiments, 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
The present invention is further illustrated below in conjunction with accompanying drawing.
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.Described Web service gang form is the abstract definition to the Web service in the Web service anabolic process.Described 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 finishing the Web service gang form, flow process proceeds to step S120.At step S120, reading Web service combinational rule from the memory cell of described Web service composite set, wherein said Web service rule of combination is based on the output parameter of the QoS index of required Web service and Web service and is predefined.
According to an aspect of the present invention, described Web service rule of combination can be based at the required Web service QoS index of specified Web service template and Web service output parameter and be predefined.According on the other hand, also can not need to specify the Web service gang form specially, set described 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.
Described Web service rule of combination is a kind of expression of user's request.In the present invention, the described Web service rule of combination logical expression that is QoS index and Web output parameter.Usually, the QoS index of described Web service comprises availability, response time, expense and reliability.Described Web service output parameter for example comprises commodity price etc.
To set described Web service rule in order understanding better to export, to be described 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 following setting Web service rule of combination based on QoS index and Web service output parameter:
Q12+Q22+Q32<100﹠amp; ﹠amp; O22<5, the overall response time of its expression Web service combination and less than the 2nd parameter (may be quofed rice of commodities) of 100 and the 2nd Web services less than 5.
Be noted that described Web service rule of combination is predefined, and be stored in the memory cell of described Web service composite set, for using in the future.In addition, described Web service rule of combination can also dynamically upgrade by revising QoS index and/or Web service parameter and logical relation thereof as required.
After reading described Web service rule of combination from described 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 finish parsing by 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 by 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 finish 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 by 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 described 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 described 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 described Web service composite set first, reads the result of the service discovery of being stored first subsequently from the memory cell of described Web service composite set at every turn.But, under the very high situation of Web service instability in selected one group of Web service combination or qos requirement, that is, if described candidate's Web service frequent variations or QoS index frequent variations then need all to carry out service discovery at every turn.In the manner described above, 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 comprised in the QoS index of the Web service that obtained and the Web service rule of combination that is parsed is compared.If the requirement that the QoS index does not satisfy described Web service rule of combination that obtains then turns back to step S140, from described candidate's Web service, select another group Web service combination.
If the QoS index that is obtained satisfies the requirement of described 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.Described reflection technology is a kind of can the monitoring and the technology of Adjustment System state and behavior by the system's readme that has a causalnexus with system running state and behavior.Utilize described 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 described 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 described 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, determine 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 described setting, can not need to specify the Web service gang form from described memory cell.
In addition, in the above-mentioned Web service combined method of describing with reference to Fig. 1 based on a preferred embodiment of the present invention, at first, carry out described QoS index obtaining step, carry out the deterministic process whether described QoS index meets the Web service rule of combination then, under the satisfactory situation of described QoS index, carry out Web service output parameter obtaining step again, whether the output parameter of carrying out described Web service then meets the deterministic process of Web service rule of combination.Example also can be carried out described deterministic process again after described QoS index obtaining step and Web service output parameter obtaining step as an alternative.Perhaps, can carry out Web service output parameter obtaining step earlier, carry out the deterministic process whether described Web service output parameter meets the Web service rule of combination then, meet under the situation of Web service rule of combination at described Web service output parameter, carry out described QoS index obtaining step again, whether the QoS index of carrying out described 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, described 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, determining unit 213 and memory cell 215.
Described 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 the QoS index of required Web service and Web service and is predefined.
Described designating unit 201 is used to specify the Web service gang form that is used for the Web service combination.Described 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 finishing described Web service gang form, described reading unit 203 is from described memory cell 215 reading Web service combinational rule, and described Web service rule of combination is at the required QoS index of specified Web service template and Web service output parameter and predefined.
After reading out described Web service rule of combination, 207 pairs of described Web service rules of combination of described resolution unit are resolved, to parse for example QoS index name, Web service output title, logical relation etc.
After described Web service rule of combination was resolved, described selected cell 207 was selected one group of Web service combination from described candidate's Web service.At 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 determining 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 determine 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, determine 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 described selected cell 207 is selected another group Web service combination from described candidate's Web service.Whether then, redefine selected another group Web service combination by QoS index acquiring unit 209, output parameter acquiring unit 211 and determining unit 213 is required Web service combination.So repeat, till finding required Web service combination.
Here, be noted that, described determining unit 213 can be carried out described QoS index respectively and whether satisfy the deterministic process of described Web service rule of combination and the deterministic process whether described Web service output parameter satisfies described 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.Example as an alternative, described determining unit 213 also can be carried out the deterministic process whether described QoS index and described Web output parameter all satisfy described Web service rule of combination again after described 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, described 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, described Web service composite set 200 can also comprise Web service rule of combination updating block, is used for as required, dynamically upgrades described Web service rule of combination by revising QoS index and/or Web service parameter and logical relation thereof.
Beneficial effect
By above in conjunction with the accompanying drawings to the detailed description of 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, at 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 QoS index or the Web service output parameter obtained satisfy the Web service rule of combination that sets, to determine 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 determined by the content of appending claims.

Claims (13)

1, a kind of Web service combined method of carrying out by the Web service composite set based on QoS and Web service output, described Web server composite set comprises memory cell, is used to store the Web service rule of combination, described method comprises:
From described 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;
The Web service rule of combination that is 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 determine 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, described determining step can occur in respectively after described QoS index obtaining step and the described Web service output parameter obtaining step, perhaps occurs in after described QoS index obtaining step and the described Web service output parameter obtaining step.
3, method as claimed in claim 1 or 2, 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 described 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 described judgement obtain or the step whether the Web service output parameter satisfies the Web service rule of combination again at selected another group Web service combination.
4, the method for claim 1, wherein before described memory cell reading Web service combinational rule, also comprise step:
The specified services gang form,
And the step that reads the Web service rule of combination from described memory comprises the Web service rule of combination that reads specified service gang form from described memory cell, and wherein said Web service rule of combination is based at the required QoS index and the Web service output parameter of specified service gang form predefined.
5, Web service combined method as claimed in claim 1 or 2, wherein, described Web service rule of combination can dynamically upgrade by 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 described candidate's Web service and QoS index thereof is not under the situation of frequent variations, described QoS index obtaining step comprises read the corresponding QoS index of being stored from described memory cell, and do not need to carry out service discovery, described QoS index of storing be to described candidate service carry out service discovery first and obtain and be stored in the described memory cell.
7, Web service combined method as claimed in claim 1, wherein, under the situation of described candidate's Web service frequent variations or QoS index frequent variations, described QoS index obtaining step comprises that serving combination to selected one group carries out service discovery and obtain described QoS index.
8, a kind of 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 described Web service rule of combination from described memory;
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 determining unit is 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 determine 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, when described determining unit one of determines in the QoS of each Web service obtained and the Web service output parameter not satisfy the Web service rule that is parsed, described selected cell is selected another group Web service combination from described candidate's Web service, and at selected another group Web service combination, described QoS index acquiring unit, described output parameter acquiring unit and determining unit are carried out the QoS index again and are obtained, the Web service output parameter obtains and judges whether the QoS and the Web service output parameter of each Web service of obtaining at 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 the service gang form,
The Web service rule of combination of being stored in the wherein said memory cell is based at the required QoS index and the Web service output parameter of specified service gang form predefined.
11, Web service composite set as claimed in claim 8 or 9 also comprises Web service rule of combination updating block, is used for as required, dynamically upgrades described Web service rule of combination by revising QoS index and/or Web service parameter and logical relation thereof.
12, Web service composite set as claimed in claim 8, wherein, in described candidate's Web service and QoS index thereof is not under the situation of frequent variations, described QoS index acquiring unit reads the corresponding QoS index of being stored from described memory cell, and do not need to carry out service discovery, described QoS index of storing be to described candidate service carry out service discovery first and obtain and be stored in the described memory cell.
13, Web service composite set as claimed in claim 8, wherein, described QoS index acquiring unit also comprises the service discovery unit, be used under the situation of described candidate's Web service frequent variations or QoS index frequent variations, selected one group of service combination is carried out service discovery and obtained described QoS index.
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