Abstract:
The present invention relates to the field of networked computer and refers to a method and respective system for providing on-demand services via an electronic network from a service provider (SP) to a client requesting a service. A plurality of third-party service providers (TPSP) are involved for providing one or more on-demand services (called TPSP service) as a possible contribution to the client-requested service.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     The present invention relates to the field of networked computer application and refers to a method and respective system for providing on-demand services via an electronic network from a service provider to a client requesting a service, wherein one or a plurality of third-party service providers (TPSP) are involved for providing one or more on-demand TPSP services as a contribution to the client-requested service.  
         [0003]     2. Description and Disadvantages of Prior Art  
         [0004]     An On-Demand Service, referred to herein as ODS, or such TPSP service may be any kind of information technology (IT) functionality offered to given TPSP scribers on a contractual basis. The contract can be created explicitly or implicitly. The service is used by the TPSP scriber at certain conditions on a usage or on a fee based model.  
         [0005]     In an On-Demand computing environment offering providers want to sell On-Demand services provided by themselves and others. The integration of TPSP services gives the offering providers a great business opportunity for the following reasons:  
         [0006]     First, it substantially reduces the time to deliver new On-Demand Services. Second, it allows the provider to offer much broader and richer set of On-Demand Services, thus increases its visibility in the market. It also substantially decreases the provider&#39;s risk since he/she does not have to incur the cost of maintaining resources needed for services obtained from a TPSP.  
         [0007]     In state of the art, a significant effort is required to integrate TPSP services into a provider&#39;s offering. In lack of standardization, TPSP services often have proprietary access mechanisms that an offering provider needs to adhere to when integrating such a service in his own offerings. There are no common access mechanisms for provider-owned resources, or for remote services and resources from TPSP. As a result of this complexity, many providers choose not to integrate at all any services in their offerings.  
         [0008]     On-demand computing—regarded from the end-user&#39;s point of view—is also a quite young feature in IT-business. As its name indicates, this approach tries to enable enterprises to use IT-resources in the actually needed scale at the very point in time, in which an enterprise actually is required to use such resources in order to fulfil any business aim. Enable enterprises to use IT resources as needed and then to fulfil any business goal. If an on-demand service can be applied successfully the requesting enterprise saves money. Because its own IT-equipment purchased and maintained by the provider is considerably more lean in comparison with a situation, in which the requesting enterprise was constrained to purchase such IT-infrastructure by himself, although it is used actually quite seldom, dependent of the nature of the business.  
         [0009]     State of the art in this very young technology is found quite seldom. At an Internet web site, retrievable under  
         [0000]     http://wwws.sun.com/software/sunone/innercircle/newsletter/feature0303. html or  
         [0000]     http://it.sun.com/eventi/jc03/pdf/parallela — 7/giorno — 28/N1_at_Java_Conference.pdf, and  
         [0000]     http://docs.sun.com/db/doc/806-4777 an approach of resource virtualization is disclosed, that describes how to best meet the requirements of on-demand services.  
         [0010]     The following paragraphs describe the state of the art approach for all major participating components, which are required to be introduced as a base for the present invention.  
         [0011]     With reference to  FIG. 1 , which is a schematic diagram representation illustrating state of the art systems of a SP&#39;s service environment and its relation to a plurality of resource managers maintained by the SP, each service is directly related to a Services Environment  10 , further referred to herein as SE. The SE represents a plurality, or some collection of resources  163 ,  165 ,  173 ,  175 ,  177 ,  183 ,  185 , necessary to fulfill the service. It contains operational data in a dedicated database  14  as well as a set of workflows  13  to create/manage/delete the required resources.  
         [0012]     Resources  163 ,  165 ,  173 ,  175 ,  177 ,  183 ,  185  may be either hardware resources, software resources, or storage resources. Also useful pre-defined combination of resources can be regarded as a single composite resource. Hardware resources are such as computing nodes, network resources such as switches, and firewalls. Software resources are such as applications.  
         [0013]     Each of these resources is managed by a Resource Manager  16 ,  17 ,  18 , further referred to herein as RM. An RM may manage a pool of resources of the same type.  
         [0014]     Resource handles, the collection of which is denoted by reference sign  12  identify resource instance services, which are kept within the Services Environment&#39;s collection of resource handles.  
         [0015]     With additional reference to  FIG. 2 , which is a state of the art schematic diagram representation illustrating the basic functionality of such state of the art interoperation between a SP service environment and a particular resource manager having access to a particular resource, the integration of resources into an SE for the use within an On-Demand Service is done in state of the art via a Resource Manager (RM)  16 . The level of abstraction of this integration can be chosen by the respective resource manager developer according to the problem domain to be addressed.  
         [0016]     A resource instance is a specific combination of resources assembled and dedicated for fulfilling the desired service at a predetermined point in time. It is not depicted in  FIG. 2 .  
         [0017]     Each resource instance is controlled by above-mentioned Resource Instance Services (RIS), e.g., denoted as  162  in  FIG. 1 . RISs  162  are created by the RMs, e.g., denoted as  16 . The resources  163  and RIS  162  are owned by the provider and are kept in the provider&#39;s premises. However, they can be local or distributed in several locations that the provider owns.  
         [0018]     In order to introduce the skilled reader to the objective of the present invention and to explain the complexity and difficulty of integrating TPSP service, let&#39;s consider a potential typical scenario, which illustrates state of the art problems:  
         [0019]     Assume, a SP wants to offer a web mail service via the Lotus (TM) Workspace Messaging product as an ODS. This offering provider likes to build up three different flavours of the web mail, platinum, a gold and a silver service. These three different services vary by the amount of storage available for each user and the frequency of mail backups. For example, a silver user gets a maximum of 60 MB, a gold 90 MB and a platinum 120 MB. The backup frequency of a silver user is once a month, of a gold user once a week and a platinum user once a day.  
         [0020]     The provider has the infrastructure, resources, and tools, and knowledge required to provide all the components of the offering except for the backup service. Until this point, the provider is fine regarding the set up of the On-demand infrastructure to offer these three (gold, platinum, silver) services and to charge for them except handling the backup service. This service is not part of the current expertise of this provider and he/she is assumed to be neither willing to invest into a skill for his/her staff members nor to invest into the required storage devices.  
         [0021]     This is the point in time, when the provider is urgently looking for a TPSP service, who offers this functionality, and for the decision, in case of a plurality of TPSP services, which TPSP service to select.  
         [0022]     Finally, a plurality of, for instance, six TPSPs are found, who offer the required backup service. Possibly, these TPSP services may be assumed to have a proprietary interface. The integration of this interface into the web mail offering is thus a significant effort for the SP due to required preparation and programming work. As a result, a SP may be in many cases assumed either not to spend this effort and disadvantageously not being able to select the best service offer.  
       OBJECTIVES OF THE INVENTION  
       [0023]     It is thus an objective of the present invention to provide a method according to a method for selecting a particular Third-Part Service provider (TPSP) service from a plurality of available TPSP services covering similar or the same business objective and being offered by one or more of TPSPs to a service provider (SP) via an electronic network, for an integrative solution, how to find automatically the best TPSP service for a desired SP service without human intervention.  
         [0024]     First, the following disclosure is given for enabling a general “automatic inclusion” of TPSP services into the service environment of an SP.  
         [0025]     According to the basic advantage of the invention concept a maximum benefit for the offering provider results from an encapsulation and automatic integration of remote resources and services, which is best provided by the present invention via resource managers providing this common access interface.  
         [0026]     Furthermore, a set of resource managers offering similar functionality by different TPSP services can be bundled by an additional component, which handles the selection of one TPSP service out of this set of TPSP services offered by the Resource Managers. The selection complies with the selection criteria specified by the SP. This is described in more detail in the second preferred embodiment later below.  
         [0027]     Advantageously, a generic interface definition allows performing the following steps at the SP side:
    a) requesting a handle for the TPSP service from the TPSP,     b) receiving a response to the request including a handle to a resource instance service dedicated to fulfill the TPSP service,     c) issuing an allocation order for allocating resources defined by the resource instance service,     d) using said TPSP service via an access interface associated with the allocated resources, and     e) issuing a deallocation order for the used resources.   
 
         [0033]     Consequently, due to the distributed nature of the present invention, which comprises respective counterparts of the invention method at the TPSP side, said generic interface definition allows performing the following steps at the SP side:
    a) receiving a request for a handle for the TPSP service from said SP,     b) creating a resource instance service associated with the requested handle,     c) issuing said requested handle to the requesting SP,     d) receiving an allocation order for allocating resources defined by the resource instance service,     e) allocating the ordered resource, if the resources are available for use,     f) receiving usage commands for the usage of the allocated resources via an access interface associated with the allocated resources,     g) receiving a deallocation order for the used resources, and     h) deallocating the used resources.   
 
         [0042]     By that, an effective cooperation is enabled between the SP and TPSP, which comprises at least the basic features needed when using on-demand services included in the own service environment.  
         [0043]     Further, the generic interface definition additionally allows performing the steps of subscribing and unsubscribing to a resource, then the field of use is expanded to even more complex business situations, in which a client is accustomed to book some reservation for the desired service, and in which it is desired to take the final decision, if and when to use the service is able to be delayed quite long.  
         [0044]     Further advantageously, a resource instance comprises another service, then the invention principle can be basically continued in order to bring up a chain of multiple services, from fourth, fifth, etc., SPs. These following TPSP-TPSP services can be included again by using a respective resource manager.  
         [0045]     The generic interface definition further allows performing the steps of disclosing to the SP information concerning the availability of resources available at the TPSP, then the SP has the possibility to first have a look on the offered services, and compare maybe to different provider&#39;s offers, and then to take a decision, to which on-demand service to subscribe. This enhances the usability of the invention concept.  
         [0046]     The foregoing method and steps thereof are implemented as a stateful web service made available via the Internet. The potential choice between service offerers is basically assumed to increase rapidly, which will increase the acceptance of this invention approach in many businesses and enterprises.  
         [0047]     Enabled for an automatic inclusion of TPSP services into the service environment of the SP as described above, the following invention features are disclosed.  
         [0048]     According to the broadest aspect of the present invention a method, comprising a so-called Meta Service Selector (abbreviated herein as MSS) and implemented as a data processing program, is disclosed for selecting a particular TPSP service from a plurality of available TPSP services covering similar or the same business objective and being offered by a respective one or a plurality of TPSPs to a SP via an electronic network. The method is characterized by the steps to follow and is performed by a SP:
    a) calling the Meta Service Selector (MSS), for example in a particular form thereof, later described and called a “Meta Resource Manager” (abbreviated as MRM), to select the best TPSP service according to a given evaluating schema referring to certain evaluation attributes and to a particular evaluation algorithm,     b) sending an enquiring request, called later below the “get service properties request” (the request asks for properties of the offered respective service; that is, the request demands the enquired service property information to be delivered formatted according to an interface data scheme agreed on between enquiring SP method and the TPSP service, wherein the interface is called, for example, a “get service properties Interface”),     c) receiving the enquired information on the requested service properties,     d) evaluating the enquired information from the plurality of TPSP services by the MSS according to a predetermined rating scheme, and     e) selecting a particular TPSP service for providing it via an electronic network to a service requesting client.   
 
         [0054]     As the overall invention method is distributed between an SP and several TPSPs, the invention has a “distributed” nature. The respective main steps performed at the TPSP are as follows:
    a) receiving the enquiring request enquiring respective request properties of a TPSP service to a TPSP, wherein the enquiring request demands the enquired service property information to be delivered formatted according to an interface data scheme agreed on between the enquiring SP request and the TPSP service, and     b) answering the enquired information to the enquiring SP.   
 
         [0057]     This invention method is suited in particular for the provision of simply-structured TPSP services, specifically provided by stateless requests. Examples are requesting some stock options, Internet telephony via the cheapest telephony service offerer, Internet-based telephony including video information, Pay-TV via Internet, etc.  
         [0058]     The above “best service selection” is basically enabled by a Meta Service Selector (MSS), which takes requests to select the best TPSP service according to an evaluation schema referring to an evaluation algorithm and to evaluation attributes. The MSS sends out enquiring requests prompting the TPSPs for responding according to predefined and agreed request specification formats. Furthermore the MSS processes the enquired and received TPSP service property information by a ranking algorithm, which is able to be freely weighted according to the actual demand.  
         [0059]     The great advantage of this general approach is that an automated, easy-to-implement procedure is disclosed, whereby a SP is enabled to find the TPSP having the best offer for a particular TPSP service in an electronic network, wherein “best” can be defined freely, very flexible according to different preferences. The automatic, short-time selection opens up consequently the feature “late binding”, i.e., the possibility that the SP may decide very “late”, i.e., shortly before actually the TPSP service is used.  
         [0060]     Thus, a flexible and quick setup of on-demand business services and flexible and quick reaction to changes in the demanded business are obtained as the SP service properties including price and service quality information can be obtained easily, quasi-automatically without human intervention and within a short time.  
         [0061]     It should be understood that the term “best” as given in the claims can be differently defined dependent of the actual needs of the service requester. One definition focuses on the quality and the safety of the service, another definition more focusing the price thereof, for example.  
         [0062]     There are basically two preferred alternatives for implementing said Meta Service Selector. The first is, when the on-demand TPSP service is encapsulated via a resource instance created by a Generic Resource Manager (GRM) acting as interface. This will be described in more detail with reference to the first embodiment later below. Herein, the TPSP service is made easily available to the SP or the client by a resource instance service managed by the SP and instantiated by the TPSP.  
         [0063]     The second alternative proposes that the interface data scheme agreed on between the SP and said TPSP is part of the requested TPSP service. This will be later described in more detail in the second preferred embodiment.  
         [0064]     Further advantageously, the enquiring request specifies time information related with the TPSP. The advantage results that the invention method enables for even more flexibility and ease of use, the end-user service requester may definitely take profit of, as his/her demands are even more completely reflected already within the enquiring request.  
         [0065]     Examples for different types of time information are as provided below. For example, a flag can be used for encoding the point in time, when the TPSP service has to be selected, which, for example, may vary amongst the following alternatives:
    a) at the point in time, at which the TPSP service is offered by SP, or,     b) at the point in time, at which the client of the SP service declares his willing to buy the SP service, which refers to the TPSP service, by, e.g., subscribing to the SP service, or     c) at the point in time, at which the TPSP service is invoked the first time, wherein the involved services are actually used for receiving the business aim of the request, a feature, which is called in here as “late binding”, or     d) at each point in time, at which the TPSP service is invoked.   
 
         [0070]     The late determination of the TPSP service (i.e., the late binding, when a SP actually requests a TPSP service) can be achieved because the invention method steps include in their implementations algorithms that are very fast and efficient. Thus, maximum flexibility is achieved regarding the actual time to decide for a particular TPSP service. The client may take large profit from this advantage in situations, where TPSP service offerings change quickly. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0071]     The present invention is illustrated by way of example and is not limited by the shape of the Figures of the drawings in which:  
         [0072]      FIG. 1  is a schematic diagram representation illustrating state of the art systems of a SPs service environment and its relation to a plurality of resource managers maintained by the SP;  
         [0073]      FIG. 2  is a state of the art schematic diagram representation illustrating the basic functionality of such state of the art interoperation between a SP service environment and a particular resource manager having access to a particular resource;  
         [0074]      FIG. 3  is a high-level schematic diagram representation illustrating the basic issue, which is addressed by the present invention integrating resources from a TPSP into the service environment of the SP depicted in  FIGS. 1 and 2 ;  
         [0075]      FIG. 4  is a representation according to  FIG. 3  and illustrating more details of the invention concept reflected therein;  
         [0076]      FIG. 5  is a schematic block diagram representation illustrating the control flow in an inventive method implemented in respective parts at the SP side (left) and the TPSP side (right),  
         [0077]      FIG. 6  is a schematic block diagram representation illustrating the basic identity items for a given exemplary service instance,  
         [0078]      FIG. 7  is a schematic block diagram representation illustrating the control flow in a first preferred embodiment of an invention method implemented at the service provider side for identifying the “best” one of all offered services, which were automatically included according to FIGS.  3  to  6 ,  
         [0079]      FIG. 8  is a high-level schematic diagram representation illustrating the issue, which is addressed by the present invention, and  
         [0080]      FIG. 9  is a schematic block diagram representation illustrating the control flow in a second preferred embodiment of an invention method implemented at the SP side for identifying the “best” one of all offered TPSP services due to the MSS and for integrating resources from a TPSP into the service environment of the SP by using the RM within the TPSP service. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0000]     First Preferred Embodiment  
         [0081]     With general reference to the figures and with special reference now to  FIG. 3  illustrating in an overview representation, how the invention integration of TPSP services into the service environment  10  of the SP is done, the skilled reader will appreciate that resources from a TPSP depicted with reference sign  30  can be used according to the invention by the services environment  10  present at the SP side.  
         [0082]     This is to illustrate the basic approach of the invention to introduce a generic resource manager  20  (see  FIG. 2 ) having a generic, i.e., a “standardizable” interface layer that can be used both to manage the provisioning of resources and to encapsulate and manage the provisioning of TPSP services. This invention interface layer  20  can advantageously be standardized and significantly facilitates the integration of TPSP service into a providers computing environment and offerings. This is depicted with the dotted line encircling the resources  163  resident at the SP side as well as the TPSP resources  30  resident at the TPSP. This approach will be detailed further with respect to  FIGS. 4 and 5 .  
         [0083]     With reference to  FIG. 4 , in a preferred embodiment of the present invention a generic resource manager  40  is implemented as a dedicated server system at the TPSP side, which is able to communicate with a number of SPs not depicted in  FIG. 4  via an invention interface  41 , which best is subjected to a IT-standard, by way of some predefined functionality relevant to the provisioning of resources from the TPSP to the SP. This functionality may be preferably implemented as a class having some predefined methods as they are depicted at the left margin of  FIG. 4 .  
         [0084]     One generic resource manager  40  is responsible per one type of resource. It “knows” all resources of the type this generic resource manager is responsible for. Therefore, resource manager  40  is able to determine, whether one resource of the managed typed is not used at any required timeframe.  
         [0085]     This functionality can be divided into necessary functions and optional functions, which are although preferred as they facilitate service provisioning. The functionality mentioned so far should be offered by each individual resource manager  16 ,  17 ,  18  (see  FIG. 1 ) or  20 , see  FIG. 2 . Those functions are defined as follows, only to mention the aspects in close relation to the present invention:  
         [0086]     The create function  410  creates a generic resource instance service  42  for a particular service or a particular resource and returns a reference to it. This generic resource instance service  42  is responsible to manage a dedicated resource of the type, managed by resource manager  40 .  
         [0087]     The delete function  420  deletes a generic resource instance service  42  for such service or such resource.  
         [0088]     The allocate function  430  allocates the required resources for a requested service or resource. This function may also be used, following an invocation of the subscribe operation. The service or resource is finally activated and ready for use in both cases.  
         [0089]     The deallocate function  450  is a call, which deallocates the resources for a resource or service, which was allocated before, see above. The unsubscribe function  460  represents basically the reversal of the subscribe function.  
         [0090]     The “find available” function  470  searches for all available resources required to run requested TPSP services at the TPSP. This functionality requires a bookkeeping of the resource, required to run offered On Demand Service. For example, it can easily be implemented when the available services per RM are listed and maintained in a relational database application.  
         [0091]     By this above functionality the invention generic resource manager  40  is able to perform all management functions, which are required for instantiating a generic resource instance service  42 . This generic resource instance service controls basically the TPSP service  48  from the TPSP. This control is realised by a respective generic resource instance interface  43  within each resource instance service  42  and the usual usage interface  44  depicted in  FIG. 4  as resource access interface. Via said access interface the resources from the TPSP are later actually used.  
         [0092]     The relationship between the resource instance interface  43  and the resource manager interface  41  is special, because the resource instance interface  43  maps the allocate ( 430 ) and deallocate calls ( 450 ) of the resource manager interface  41 , which are required to set up the dedicated resource. This covers, for example, the differences in setting up a zLinux server in general as a resource or a database on zLinux. The allocate call ( 430 ) triggers the installation and configuration of selected resources.  
         [0093]     Further, it should be noted that a contract  46  is concluded between the SP and the TPSP at that point in time, in which the SP basically subscribes to a TPSP service. In order to do that properly, a person skilled in the art will appreciate that for the contracting purposes and the accounting and billing procedures behind it is recommended to include a unique key and a subscriber ID into the request, by which a TPSP service is actually subscribed to.  
         [0094]     The functionality described above with the functions of create, delete, find available, subscribe, unsubscribe, allocate and deallocate represents a preferred way for implementing the generic interface definition used between said SP and said TPSP SP. This functionality is programmed in a form agreed on between SP and TPSP such that the syntax and semantic of said interface definition is understood and clearly and properly to be applied at both providers.  
         [0095]     As a person skilled in the art may imagine, the proposed generic interface definition having a semantic as exemplarily described above with the above-mentioned functions is able to encapsulate the requested services or TPSP services into the service environment of the SP. This is due to the fact, that basically no manual work is necessary at neither the provider nor the TPSP for finding available resources at the TPSP, or for the reservation of such resources, or for the actual allocation and use of such resources or services. By that basically full automation of the workflow between SP and TPSP it is possible to integrate the resources and services offered by a TPSP into the service environment of the original SP. Thus, this original SP may easily take profit from such TPSP services and is able to forward the TPSP services to his own clients. This makes it easy to increase the own service offering by the SP.  
         [0096]     Thus, even more advantageously the generic resource manager  40  maintained by TPSP is subjected to a standard syntax and semantic. By that the interaction between TPSP and SP is even more facilitated.  
         [0097]     Further, it is advantageous to implement such general resource manager functionality depicted as  40  as described above or similar thereto as a stateful web service. This feature opens up easy use of this functionality via the Internet.  
         [0098]     With further reference to  FIG. 5 a  preferred embodiment of the invention method is described next below.  FIG. 5  shows a schematic block diagram representation illustrating the control flow in an inventive method implemented in respective parts at the SP side (left) and the TPSP (right).  
         [0099]     This preferred embodiment comprises the advantageous, optional features of the “find available” function  470  described above and the subscribe  440  and unsubscribe  460  functionality, also described above. It should be understood, of course, that many variations of the underlying workflow between the SP and TPSP may exist, which may be recommended depending on the respective use of the invention method.  
         [0100]     The following exemplary use is that a SP, whose actions are depicted at the left column of  FIG. 5  wishes to use a backup TPSP service offered by a TPSP (right column of  FIG. 5 ), in order to offer to any end-client not depicted in  FIG. 5  the additional backup service as an add-on to an email service he was basically offering already before to the end-clients. As the SP has neither the own resources nor the own know-how required to offer the backup service he desires to purchase this backup service as a TPSP service added on his own email service.  
         [0101]     The TPSP is assumed to offer his TPSP services, for example, in an Internet portal, and the generic resource manager, which was described above, is assumed to be implemented at the respective web server at the TPSP. Thus, in this case the offering and accepting of the TPSP service is implemented as a stateful web service.  
         [0102]     In a first step  505  the SP requests the overall offer of services, offered by the TPSP. This is simply done by clicking on the respective button in the respective web site maintained by the TPSP.  
         [0103]     Thus, in a step  510 , TPSP receives such request and responsive to that triggers its “create” and “find available services” functionality as described above in order to show the total of the services, TPSP offers to the requesting SP.  
         [0104]     Thus, in a step  515  each TPSP service or package of TPSP services, is displayed to the SP, if this is useful to apply. This may be in a case, in which for example a strong price reduction can be obtained for a group of services compared to the sum of the respective plurality of single services. Thus, the services must be distinguishable by some service ID.  
         [0105]     A service ID as exemplarily and schematically depicted in  FIG. 6  is comprised in a data set further comprising, advantageously, a description of the service or TPSP service, the price per time if used, all other information, which is required from the TPSP side to close a contract with the SP for the usage of the required service, and other descriptive information the requesting SP may be assumed to be interested in to know before he decides to subscribe to a particular TPSP service or not. Additional information, dependent of the individual use and application of the invention method can be added. The dataset in  FIG. 6  is thus to be understood only in a symbolic sense defining the basic information required in this context.  
         [0106]     Thus, in a step  520 , TPSP issues the TPSP service collection as an offer to the requesting SP. It should be added that the above-mentioned data set describing the TPSP service offered to the SP may further contain data fields telling from which time until which second time the respective service is available and, optionally if there is any SP already registered who has filed any serious interest to use the service in a respective future time span, such as it is known from state of the art booking/reservation systems.  
         [0107]     In step  525  SP will receive all information needed about the available TPSP services from the TPSP. Supplied with this information SP may take any required considerations regarding economical aspects, operational aspects, etc., which are useful to make up a decision if or if not to select one or more of the offered TPSP services. Thus, SP may be assumed to request in a step  530  a handle for a particular, selected TPSP service from the offering TPSP. In a web service environment, this will be implemented as usual in state of the art, for example, by highlighting and marking up a TPSP service for selection. This selection is transported as a request via the electronic network for a handle for said TPSP service in order to open up the possibility to continue the procedure and to make some kind of booking or reservation or actually immediate use of the service, the implementation of which will be described next below.  
         [0108]     In a step  535  TPSP will receive the request for the handle for the selected TPSP service and will create in a further following step  540  a so-called resource instance service, which is associated with said requested handle. This is done according to a specific advantageous aspect of the present invention. The resource instance service has an information structure, which identifies all relevant hardware and software to be used for fulfilling the request, e.g., by providing respective ID-tags to the resources.  
         [0109]     In the exemplary use introduced further above of realizing a backup TPSP service in the context of an email service offered by the SP, the TPSP will have to make a reservation for some hardware, i.e., some storage devices operatively coupled to some processing power and a respective software solution for performing the required backup TPSP service. Thus, any hardware unit and software unit should have a respective ID, which can be addressed within such resource instance service. It should be noted, that it is useful to make up a standard for the format, in which those IDs are distributed in such resource instance service description.  
         [0110]     Assume a case, in which the TPSP manages its own resources within a relational database, then a respective read access to this database must be performed in order to select the respective three resources, which are available for the TPSP.  
         [0111]     Further, TPSP generates a handle for the requested service. This handle comprises all information necessary to identify all resources, expected to be used during the lifetime of the respective requested TPSP service. Thus and with reference to  FIG. 6  showing the basic identity items for a given service instance, for example a handle may be comprised of a collection of an exemplary number of 15 IDs describing all necessary hardware devices, network connections within the TPSP service environment, software licenses required to perform the doing of the service, etc. It should be added, that it is required for the TPSP to manage all these IDs in order to be able to determine which of his/her resources are available in a respective selectable time span, and which are not.  
         [0112]     In a next step  545 , the generated handle for the requested TPSP service is issued to the SP. SP receives this handle (e.g., the TCPIP address and the user-Id with password) in a response to his/her own request and stores the received handle within its own service environment. Thus, the SP is enabled to use this handle for identification of a particular resource instance service dedicated at the TPSP to fulfil the desired TPSP service, step  550 .  
         [0113]     Further, in a step  555  the SP issues an allocation request via electronic network and the above-mentioned web server application for allocating the resources defined by the handle and thus by the above-mentioned resource instance service. The TPSP will, when receiving in a step  560  the allocation order for allocating the above-mentioned resources, store that order into a respective contract database, in order to process such data for accounting and billing purposes.  
         [0114]     Next, in a step  565 , the TPSP will allocate the ordered resources if the resources are available for use, at the desired point in time, in which the allocation is ordered to take place.  
         [0115]     A subscription can take place a long time before the actual allocation of the resource. But the allocation call by the SP should be quite close to the usage of the TPSP service to use the resource efficiently. A respective allocation confirmation is issued in a step  570  to the SP, accompanied by all required additional information for enabling the actual use of the required resources. Thus, an URL may be added in this confirmation message in order to enable for a remote procedure call issued either from the SP or, if desired, from the end-client, directly. The accounting and billing procedures between client and SP are not immediate subject of this present application. It should be preferred, however, a solution, in which the client is billed through the SP alone and the SP is billed by the TPSP.  
         [0116]     Then, after receipt and processing of the data according to step  572 , in a step  575 , the SP uses the requested TPSP service via an access interface associated with the allocated resources. In the example, given just for illustration purposes, the access interface comprises sufficient information, to actually find, identify and use the required resources. For example, a TCPIP address, a hardware ID for a mail backup server, and the commands to perform the backup should be defined in the access interface.  
         [0117]     In a step  580  the TPSP will collect data on the usage of the subscription by the SP. Based on the usage data the TPSP is going to bill the SP.  
         [0118]     The requested resources may be used during the time span defined during the subscription time agreed upon in the contract between SP and TPSP.  
         [0119]     Finally, the SP decides not to stop using the allocated resources, the SP issues a respective “unsubscribe” order for the used resources (see step  585 ). This unsubscribe order is received by the TPSP, who deallocates the used resources corresponding to that unsubscription order, step  592 . Then the TPSP confirms to SP in a step  595  that the resources were deallocated, which is received by SP, step  597 .  
         [0120]     Finally, respective billing and accounting procedures can be triggered at the TPSP in order to complete and finish the overall on-demand TPSP service processing.  
         [0121]     Now, with reference to  FIG. 7 a  schematic block diagram representation is given for illustrating the control flow in a first preferred embodiment of an invention method implemented at the service provider side for identifying the “best” one of all offered services, which were automatically included according to FIGS.  3  to  6 . As this can be regarded as an Add-on functional component to that one described above with reference to FIGS.  3  to  6 , the location, where to fill-in the  FIG. 7  control flow, is marked in  FIG. 4  with a bold-printed arrow. In  FIG. 4  the Generic Resource Manager (GRM) is extended by a new function  480 , called getServiceProperties, which is denoted similarly.  
         [0122]     Assume, a TPSP service is offered more than one time, e.g., by a plurality of TPSPs. These TPSP services are processed as described in the  FIG. 5  control flow, including step  550 . The issue is now, how to decide, which is the best TPSP service out of them. Before definitely subscribing to anyone of said TPSP services, according to this invention embodiment the best service will be identified by a Meta Service Selector (MSS), which is later also called “Meta Resource Manager”, in detail with reference to  FIG. 7  as follows:  
         [0123]     An Application Programming Interface (API) call “GetBestService” is performed, which is realized by the Meta Resource Manager (MRM). This call “invokes GetBestService”, step  710 , with a file as parameter, which accords to the following rules: The file is written in a tagged based language, e.g., XML. This file lists information which is strongly required to determine the best service by the MRM. The file can be coded in XML, for example. This information contains the attributes of the TPSP service, which the MRM has to request calling the Resource Managers of the TPSP services, and the algorithm, which uses the attributes as an input to determine, which TPSP service fits best to the needs of the SP. The attributes are advantageously divided into attributes, which are mandatory to be answered by the TPSP service and attributes, which are optionally to be answered. Mandatory attributes ask, e.g., for the service identification key (ID), an availability for a reservation of the service and the price. Purely optionally returnable details include, e.g., the reliability characteristics of the TPSP service.  
         [0124]     The input file, which the MRM receives with the “get Best Service” call, lists for each of the attribute a weight, which is adjustable by the SP. All properties with weights are considered during the determination of the best TPSP service by the MRM. Furthermore, the type and format of the XML file depends on the evaluation algorithms and is implementation-defined.  
         [0125]     The MRM defines and owns the XML scheme, the XML file has to comply to. This provides for maximum flexibility for the list of attributes to be handled during the determination of the best service.  
         [0126]     In addition for purposes of increased clarity and completeness, next an exemplary XML file usable in the above mentioned GetBestService Call is given without major further comments. A skilled person will understand it just by shortly stepping through. The weights serving the SP for an individually trimmable selection of TPSP services, are included at that point in time. All tagged items correspond to variable names that may be associated a value by the requested RM. The weights values are removed, step  720 , before sending them to all competing RMs, step  730 .  
                                   &lt;service type&gt;data backup service&lt;\service type&gt;       &lt;algorithm to determine the service&gt;A* for data backup service         &lt;\algorithm to determine the best service&gt;       &lt;span of time for availability&gt; 4 months &lt;\span of time for       availability&gt;       &lt;duration of service usage&gt;02-01-04 to 12-31-04 &lt;\duration of       service usage&gt;       &lt;mandatory returned details&gt;       &lt;service id&gt;&lt;\service id&gt;       &lt;availability of service&gt;&lt;weight&gt; ko criterium       &lt;\weight&gt;&lt;\availability of service&gt;         &lt;price&gt; &lt;weight&gt; high &lt;\weight &gt; &lt;\price&gt;         &lt;backup speed&gt; &lt;weight&gt; medium &lt;\weight&gt; &lt;\backup speed&gt;         &lt;availability of backuped data&gt; &lt;weight&gt; medium &lt;\weight&gt;         &lt;\availability of backuped data&gt;       &lt;\mandatory returned details&gt;       &lt;optional returned details&gt;       &lt;downtime of service&gt; &lt;weight&gt; medium &lt;\weight&gt; &lt;\downtime of       service&gt;       &lt;maximal storage capacity&gt; &lt;weight&gt; medium &lt;\weight&gt;         &lt;\maximum storage capacity&gt;           &lt;service is available&gt; &lt;\service is available&gt;       &lt;\optional returned details&gt;                  
 
         [0127]     Then, each RM of the TPSPs, which is known by the MRM to offer a TPSP service close to the required one, receives and reads—step  740 —the request for information and the appended XML-file specifying the desired details on the TPSP service properties. To cover the receiving, reading and answering the request regarding the TPSP service properties, the RM of the TPSP service has to be enhanced by a “getServiceProperties” API. Assuming, the TPSP supports a shared service interface defining an agreed format on which and how to describe the offered on-demand service properties, the TPSP RM is enabled to add the service properties into the received XML file in a step  750 .  
         [0128]     Similarly, an exemplary filled-in XML file is given next:  
                                                   &lt;service type&gt;data backup service&lt;\service type&gt;           &lt;span of time for availability&gt; 4 months &lt;\span of time for           availability&gt;           &lt;duration of service usage&gt;02-01-04 to 12-31-04 &lt;\duration of           service usage&gt;           &lt;mandatory returned details&gt;           &lt;service id&gt; 07227768978973468 &lt;\service id&gt;           &lt;availability of service&gt;             02-1-04 to 05-31-04,           04-1-04 to 07-31-04,           05-1-04 to 08-31-04,           07-1-04 to 10-31-04,           08-1-04 to 11-31-04,           00-1-04 to 12-31-04             &lt;\availability of service&gt;             &lt;price&gt; 0.01 $ per MB &lt;\price&gt;             &lt;backup speed&gt; 20 MB per sec. &lt;\backup speed&gt;             &lt;availability of backuped data&gt; 12 weeks &lt;\availability of           backuped data&gt;           &lt;\mandatory returned details&gt;           &lt;optional returned details&gt;           &lt;downtime of service&gt; 1h per day &lt;\downtime of service&gt;           &lt;maximal storage capacity&gt; 100 Tera Byte &lt;\maximum storage           capacity&gt;               &lt;service is available&gt; since 01-01-03 &lt;service is           available&gt;             &lt;\optional returned details&gt;                      
 
         [0129]     Then, in a step  760  the TPSP resource manager (RM) sends back the filled-in XML-form to the requesting SP MRM.  
         [0130]     The MRM collects those answers from all responding TPSP&#39;s RMs in a step  765  and stores them in a database, step  770 . Thus, in a next step  775 , the TPSP is enabled to read the answers including the properties of the offered services and to “understand” and rate the contents of the answers. Thus, an evaluation algorithm runs according to the evaluation algorithm in the “getBestService” Call in a respective program, evaluating all delivered information according to a set of predefined criteria including those weighting values provided by the TPSP.  
         [0131]     Now, the MRM sets up a ranking algorithm for generating a ranking list setting the “best” service on top of a services list, for example, step  780 .  
         [0132]     The resulting top-level service is the best one according to the predetermined selection criteria, and no human intervention is needed for selecting the best service from the ranking list, step  785 . Finally, the handle (i.e., a program-detectable identification for the best service) is returned to the program having called the MRM, step  790 .  
         [0133]     Then, the control flow is performed continuing in  FIG. 5  with step  560  as described above.  
         [0134]     Next, the second, alternative invention embodiment will be described in more detail, which proposes that the interface data scheme agreed on between the SP and TPSP is part of the requested on-demand service itself.  
         [0135]      FIG. 8  is a high-level schematic diagram representation illustrating the issue, which is addressed also by the second embodiment of the present invention. The present invention defines, how to select and integrate resources  30  (see the right hand portion of  FIG. 8 ) from a TPSP into the service environment  10  of the SP after having selected the best service before.  
         [0136]      FIG. 9  is a schematic block diagram representation illustrating the control flow for the above-mentioned second preferred embodiment of the invention method implemented at the SP side for identifying the “best” one of all offered TPSP services due to the MRM and for integrating resources from a TPSP into the service environment of the SP by using the RM within the TPSP service. Here, the execution of selecting the best service and relating the chosen TPSP service into the SP environment asks for a MRM and for an improved RM within the TPSP, which offers the “getServiceProperties” functionality as a separate Application Programming Interface (API). In order to avoid redundant information, the description of  FIG. 9  is given by referencing back to the description of  FIG. 7  for the steps  710  to  790 , ending with the handle (i.e., a program-detectable identification for the best service) being returned to the program having called the MRM, followed by the description of steps  560 —to receive the allocation order from SP—to  595  according to  FIG. 5 .  
         [0137]     The above description should reveal that the workflow described in this exemplary workflow can be subjected to various modifications. Those modifications, however, form part of the invention approach of encapsulating the TPSP services into the service environment of the SP and selecting the best of them automatically.  
         [0138]     The present invention can be realized in hardware, software, or a combination of hardware and software. A tool according to the present invention can be realized in a centralized fashion in one computer system, or in a distributed fashion where different elements are spread across several interconnected computer systems. Any kind of computer system or other apparatus adapted for carrying out the methods described herein is suited. A typical combination of hardware and software could be a general-purpose computer system with a computer program that, when being loaded and executed, controls the computer system such that it carries out the methods described herein.  
         [0139]     The present invention can also be embedded in a computer program product, which comprises all the features enabling the implementation of the methods described herein, and which—when loaded in a computer system—is able to carry out these methods.  
         [0140]     Computer program means or computer program in the present context mean any expression, in any language, code or notation, of a set of instructions intended to cause a system having an information processing capability to perform a particular function either directly or after either or both of the following: conversion to another language, code or notation; and/or reproduction in a different material form.  
         [0141]     The above-mentioned objective of the invention is achieved by the features stated in enclosed independent claims. Further advantageous arrangements and embodiments of the invention are set forth in the respective dependent claims. Reference should now be made to the appended claims.