US20040207659A1 - Program creation by combining web services using graphic user interface controls - Google Patents

Abstract

The invention provides a Graphical User Interface (GUI) interface for building programs from web services. The interface to a web service is represented in a user menu preferably by an icon and text. A user drags and drops an icon representing a web service from the menu to a display area and interconnects the icon to other icons representing other program entities (preferably other web services). Preferably, a more detailed icon is created in the display area after the drag and drop. The completed set of interconnected icons in the display area are saved as a new program entity. The invention further includes visualization of the flow of information through the model in a test mode.

Description

FIELD OF THE INVENTION
• The present invention is related to programming on the World Wide Web. It is more particularly related to combining web program objects (Web Services) using GUI controls to create a new program object.[0001]
BACKGROUND OF THE INVENTION
• The World Wide Web (The Web) is a popular computer networking platform today with millions of people daily using it for a wide variety of applications from personal e-mail and research “web surfing” to highly sophisticated business and scientific uses. The web was developed to make use of the Internet simple and easy to use. The concept was to provide Browser programs at user (client) personal computers (PCs) to interpret information from host servers using HTML and graphic files. The Internet provided the communication means to interconnect web clients and servers.[0002]
• Web services are programs that are accessible by a server and perform a function for the client community. A web service, in one example, provides stock ticker information. A client, knowing that a web service is available, can access the web service to accomplish an operation for which the client would otherwise have to create a program. With the availability of the web service, the client merely needs to know how to interface with the web service and he can incorporate the function of the web service into his local application.[0003]
• In order for the programmer to know how to interface with the web service, he needs to understand an interfacing language. One such language is Web Service Description Language (WSDL) (according to the W3C standards found on the web at www.w3.org/TR/wsdl) which is an XML based language for describing the interface to a web service. A web service, operating as a content provider for a server, provides a WSDL document to client programs. The WSDL document defines interface schema such that the client knows the required format, protocol and the like for the web service interface. The client needs to understand the functionality of the web service (that it provides stock quotes and that data is encrypted for instance). Each web service defines it's own terminology as well.[0004]
• Web service interfacing language makes it much easier for a programmer to write code to incorporate the functionality of a web service into a custom program, however, programming knowledge (WSDL, XML, HTML etc.) required to do this.[0005]
SUMMARY OF THE INVENTION
• This invention is directed to simplifying program creation using web services. The present invention provides a list (menu) of web services (and optionally other programs) available to a user. A programmer uses a creator program that creates icon support for each web service that will be supported by the present invention. A menu placer function, places the created icons in a menu. Icons are also created for custom programs that are not web services. Such icons can be used to provide audio, visual, mechanical interfaces for instance. Icons are made available to a user either by an authorizing agent or by retrieving icons from a content provider. Preferably, each icon is represented by a title and supporting descriptive text. The title and optionally the descriptive text is displayed at the user's client computer with an associated general icon image. The icon comprises access to program code, web service interfacing controls, as well as visual characteristics.[0006]
• The user selects an icon title and (using a UBI mover) drags it into a frame (canvas). He can then execute the icon in the frame to test it's functionality. He can interconnect it (using an interconnector GUI 1506) with other objects in the frame to create a new functionality. When the icon is dragged into the frame, preferably, a more detailed icon is created that visually depicts interfacing choices (if applicable) such that the user can select (for example) English or Spanish language conversion by selecting (using a GUI selector) the appropriate visual representation when he interconnects the object. The user can set appropriate parameters using a parameter setter GUI to customize the function of the selected Icon. The user, in one embodiment, uses a display initiator GUI to display parameter options for an Icon; then, using an operator operating on the display of parameters, the user sets the appropriate parameters; finally, the user exits the display of parameters using an exitor GUI.[0007]
• In one embodiment, the user can test the functionality of the customized Icon(s). He uses an initiator GUI to initiate the test. The test is performed and results in a GUI modifier, modifying the visual presentation of the display in order to indicate the functional state of the Icon(s) according to the test functionality. The display may be altered in color, brightness, text message display, shape altering or an audio representation might be made.[0008]
• In one embodiment, the interconnected Icons are saved by a representation saver as a capsule representation. The saved capsule representation is further represented by a capsule icon such that it can be added to the user's list of available icons.[0009]
• When the user is satisfied with the functionality of the interconnected icons in the frame, he saves the frame structure as a named program entity. In the future, he executes the named program entity as a single object.[0010]
• In one embodiment, the named program entity can itself be assigned an icon such that the named program entity can be used in the drag and drop creation of a new frame.[0011]
• It is therefore an object of the present invention to provide drag and drop icons with optional visual attributes for web services.[0012]
• It is another object of the present invention to provide a mechanism for interconnecting drag and drop icons to create a new function.[0013]
• It is still another object of the invention to save the combined interconnected objects as a named program entity.[0014]
• It is yet another object of the invention to verify the functionality of interconnected icons by performing a sample test by supplying input arguments.[0015]
• It is another object of the invention to provide a visual indication of the operation of the icons when they are active in a test mode.[0016]
• These and other objects will be apparent to one skilled in the art from the following detailed description of the invention taken in conjunction with the accompanying drawings in which:[0017]
BRIEF DESCRIPTION OF THE DRAWINGS
• FIG. 1 is a high level depiction of a computer system for executing program applications;[0018]
• FIG. 2 is a high level depiction of a computer network employing a multiplicity of interconnected computer systems;[0019]
• FIG. 3 is an example view of the GUI display using the present invention;[0020]
• FIG. 4 expands a portion of FIG. 3 to depict a list of icons;[0021]
• FIG. 5 expands a portion of FIG. 3 to depict interconnected icons dragged from the list of FIG. 4;[0022]
• FIG. 6 shows flows for initiating and saving icons;[0023]
• FIG. 7 shows flows for creating an interconnected group of icons;[0024]
• FIG. 8 depicts flows for executing an interconnected group of icons;[0025]
• FIG. 9 depicts flows for accessing a SOAP capsule;[0026]
• FIG. 10 depicts flows for WSDL generation of a capsule;[0027]
• FIG. 11 depicts flows for a SOAP bridge;[0028]
• FIG. 12 depicts flows for an IDS request;[0029]
• FIG. 13 depicts an example of a server flow;[0030]
• FIG. 14 depicts a linear flow;[0031]
• FIG. 15 depicts a single record flow with parallel execution with tasks on different computers;[0032]
• FIG. 16 depicts a multi-record flow with parallel execution with tasks on different computers;[0033]
• FIG. 17 depicts a parallel flow; and[0034]
• FIG. 18 depicts a flow with a switch operator.[0035]
DESCRIPTION OF THE PREFERRED EMBODIMENTS
• FIG. 1 shows an example computer system useful for Web or Internet Peer-to-Peer network communications and executing object oriented programs such as those of the present invention. The system is comprised of a[0036]processor106 for executing program instructions fetched frommemory105. Storage Media107 (magnetic or optical) is used to hold programs and data that is not currently being operated on by theprocessor106. The base computer optionally has peripheral devices attached to it to supply a user interface. Typically peripherals include aDisplay102,Keyboard104 and anetwork connection108. Optionally, amouse103, printer/Scanner110 are also connected to the example computer system.Programs111 held inStorage Media107 is paged intomemory105 for processor execution.Programs111 include an operating system and applications including the applications of the present invention for example. Object oriented programs are programs that generate program objects during run time. These objects are held inmemory105 for execution by the processor.
• FIG. 2 shows a plurality of computer systems of various designs interconnected by local and Internet networks as might be used by the present invention. Client computers[0037]201-205 directly interact with users and provide a means for requesting information. Servers206-207 receive client requests and perform an operation in response. The operation may be simply retrieving information (HTML, GIF files comprising a web page for example), provide a path to the Internet network, or may trigger custom programs that run at the server (CGI script) or JAVA applets that run at the client computer.
• Peer to Peer networks also exist wherein a computer can operate as a client and a server, enabling the computers to communicate directly.[0038]
• Glossary:[0039]
• UDDI (Universal Description, Discovery, and Integration) is an XML based registry of web services and business names, products and locations on the web.[0040]
• WSFL (Web Services Flow Language) is XML based language designed by IBM for description of Web Service compositions. It relies and complements other specifications such as SOAP, WSDL, XMLP and UDDI.[0041]
• SOAP (Simple Object Access Protocol) XML based protocol for exchange of information. SOAP comprises an envelope that defines a framework for describing a message and how to process it, encoding rules and convention for representing remote procedures.[0042]
• XMLP is the formal set of conventions controlling format and processing of XMLP messages and application interaction.[0043]
• IDS (Intelligent Decision Server) also DIS (Distributed Integration Solution) U.S. Pat. No. 6,094,655 (Rogers et al.) “Method of creating and using Notes decision capsules” assigned to IBM. IDS executes selected program capsules which are strung together capsule elements.[0044]
• Web Services are applications normally available from a remote server by way of the world wide web. Web services preferably describe themselves using WSDL (an XML based document that describes the interface of the web service). A directory (conceptually equivalent to a telephone directory for phones) is provided so users can find available services, preferably UDDI. A means for communication between the web service and its clients is also provided, preferably SOAP.[0045]
• The present invention expands on the web services environment, and prior art as described in:[0046]
• U.S. Pat. No. 6,094,655 “Method of Creating and Using Notes Decision Capsules” (Rogers et al.);[0047]
• U.S. Pat. No. 5,710,918 “A Method for Distributed Task Fulfillment of Web Browser Requests”;[0048]
• U.S. Pat. No. 5,701,451 “A method for fulfilling requests of a web Browser”;[0049]
• U.S. Pat. No. 5,721,908 “Computer Network for WWW Server Data Access over Internet”;[0050]
• U.S. Pat. No. 5,752,246 “A Service Agent for Fulfilling requests of a Web Browser”;[0051]
• U.S. Pat. No. 5,745,754 “A sub-Agent for Fulfilling Requests of a Web Browser using an intelligent agent and providing a report”; and,[0052]
• U.S. Pat. No. 5,974,441 “WWW Client Server Interactive System Method with Java”,[0053]
• all of which are assigned to International Business Machines and incorporated herein by reference.[0054]
• With the emergence of web services on the Internet, building new applications using these services becomes a new way of developing applications. Often, web services are developed by independent groups and combining these services together in meaningful ways is not easily accomplished. Our invention allows non-developers a way of creating, combining, packaging, and using these services together in an “encapsulated” process flow. We provide a means for combining and encapsulating web services that may have never been intended to work together.[0055]
• We provide a way to define the linkage between web services, and build combinations of (web) services workflows. These combined by linkage services are called capsules (a sequence of web services connected together in a process flow). In our approach output from a web service are taken as is, and used as input to another web service (or set of web services in parallel). Or, optionally, output from a web service is converted or transformed before being used as input to another web service(s). The transformers are the function of local services (part of a tool set) or, in another embodiment, the transformation is performed by transformer web services. These combinations of web services, or encapsulated process flows (capsules), are built by users (using our tool) who are not required to have programmer skills using the “Visual Flow Builder” (Capsule for Web Services). The tool in one embodiment has UDDI integration, so that users can access any web service on the Internet and incorporate the service into their capsules. The capsules are then saved with all attributes for later use. The saved capsule is either retrieved and executed from within the tool, or exported as a web service to be made available to other applications (via UDDI for example). Execution within the tool is useful for debugging purposes as well. The tool provides informational feedback to the user when executing a flow. For example, as a capsule executes, the flow of events from web service to transformer to web service is depicted by highlighting the currently executing web service. In one embodiment, the visual icon representing the web service that is executing is green when it is executing, white when it is idle and red when it has detected an error.[0056]
• The present invention provides a non-programmatic means for web services to be combined (encapsulated) to develop process workflows that can be partial or complete applications, or “super” services (a combination of web services that can then be offered as a web service).[0057]
• The present invention provides a method for defining these combinations of services (capsules), so that they can be created, viewed and modified. (Visual Flow Builder).[0058]
• The present invention provides a method for saving and retrieving these capsules for modification, distribution (e.g. to a UDDI registry or a web application or product), and/or execution (with debugging capability).[0059]
• The present invention provides a method for executing the process workflows (capsules) with visual feedback over the Internet (or Internet) or a combination of environments.[0060]
• A system creates the web service icon in the following way. Based on the analysis of the WSDL of a web service, a system knows the signature and the return type of the method(s) of a web service. The system then creates the text/icon representation of the method. In one embodiment, each method is a box with several rows. First row is the name of the web service, second row is the name and return type of the method, third row and rest (if exist) represent the input parameter types.[0061]
• Creating Local Web Service Directory:[0062]
• The web service capsule builder provides three methods for cataloging available web services. The first is by querying a UDDI server (the de facto directory for web services). The second is via the file system using an XML based document. The third is by manually adding a service to the local catalog by entering all aspects of the service in the visual WSDL creator. Either way, building a service capsule is done by first gathering all the services needed to build the desired flow. The[0063]left pane302 of theservice capsule builder301 is a WSDL browser, providing a generic interface for viewing services and the methods/functionality available from those services.
• The local list of[0064]available web services302 can be created by an method known in the art. The list can be created manually by selection from a central list available from a web site for instance. The list can be provided in a hierarchical grouping for ease of navigation.
• In one embodiment, referring to FIG. 4, a custom web service capsule browser tool queries a local file directory or a remote site via HTTP or FTP or UDDI for the available WSDL documents, analyzes them based on user input criteria and creates the[0065]list302 of web service icons that represents the web services401-406. Each web service (BlueMail in402 for example) may have one or more than one method exposed which is represented as a method icon shown as the child node of the web services (forBlueMail402, “* xsd:string send . . . ”). For example, the user selects File/Import WSDL from a menu in the custom web service browser, and browses to a file directory and selects the Number2Text.wsdl. The system then reads that WSDL, analyzes it and creates a Number2Text web service node with getNumber2Text method as its child node. Number2Text web service node is represented by a web service icon (bell) and the getNumber2Text method is represented by a web service method icon (ball or *)302.
• Building a Capsule:[0066]
• Given a[0067]populated service listing302, capsule construction can commence. Creating a newweb service capsule303 does two things. First, it provides the space (referred to as capsule canvas) within which individual services are arranged, chained, viewed or tested and second, it acts as the named container for the service. The capsule itself303 represents a single service even though multiple web services may be used to define a capsule. So, by creating acapsule303 we create a web service whose function is the flow of services501-503 it contains.
• Referring to FIG. 5, after a web service icon is dragged and dropped into the flow construction area for the[0068]new capsule303, preferably a more detailed icon is created preferably comprising two or more rows. Each row provides a GUI means for selecting an option for the web service. Options can include parameter selection, personalization of text, or alternative interconnect contact points for interconnecting more than one input or output to the web service icon. For example, the “Translator”web service502 has five rows. The first row is the name of the web service, “Translator” in this case. Thesecond row506 is the name of the method, “Translate” in this case, and the return type, “xsd:string” in this case. Row three507 to row five509 is the method signature, “xsd:string mtlang507, xsd:string text508, xsd:string option”509 in this case. “Xsd:string” is the type of the input parameter.Mtlang507 is the language to translate to. Text is thetext508 to translate.Options509 is the format of the output, either text or HTML. To invoke this web service for translating text from English to Spanish, for example, the user needs to right click on thethird row507 which produces a pop-up window (not shown). The user then sets mtlang to Spanish in the pop-up window. Next the user right click on thefourth row508 and sets text to the word/sentence that he/she wants. Finally, the user right clicks on thefifth row509 to set the options to “text”, “HTML” or leave it as blank.
• It should be understood that XSD is a XML prefix to denote the XML Schema namespace “www.w3.org/2001/XMLSchema” and it conforms to XML schema convention. “xsd:item” such as xsd:string is used to identify the type of input parameter or type of the return method.[0069]
• After the user has dragged and dropped web services into the flow pane (canvas), connected them and set the needed input parameters, a capsule is created. Behind the scene, a graph data structure that represents the web services objects and the interactions between the web services is also created. When the user selects Save or Save As from the File menu, the graph data structure is saved to the hard drive as WSFL using Java Object Serialization. In one embodiment, the saved capsule can be added to the users'[0070]web services menu302.
• Dragging and dropping a web service[0071]401-406 from theservice list302 to thecapsule canvas303 visually instanciates the resource and in a preferred embodiment creates a detailed icon for the web service. It is represented with the name of the service, the function being used from that service504-517 and the inputs and outputs required for the service to function. In this example we have dragged the “Number2Text”service501 to thecapsule canvas303. This service takes a number and spells out that number in English. (e.g. input “1” becomes output “one”) We initializedNumber2Text501 with a number, in this case, thenumber 1. This number could also be specified if the capsule is invoked as a web service (see, Invoking/using capsules).
• We then dragged the Translation service “Translator”[0072]502, to thecapsule canvas303. We connected theNumber2Text501 output to the input of the Translator. We manually set the translator to translate for English to Spanish. If we ran the capsule, or service flow, it would call theNumber2Text service501 and it would return “one”. It would pass that result to thetranslator service502 and it would translate “one” to “uno”. As the flow executes the current service is highlighted and the connecting arrow visually represents success and failure via red and green color. The flow from one service to another can be visually reviewed and analyzed. As capsule complexity increases this has proven to be very informative. Execution visualization can be performed in many ways familiar to one skilled in the art. Animation can be added to demonstrate the functionality under test. The visual presentation can be augmented by audio to further enhance the visualization of functionality. In the present example for instance, an animated character such as a walking human figure can carry the message from Icon to Icon while the highlighted icon or interconnection defines the item being visualized. The computer then indicates with voice messages as if the animated character were commenting such indicators as “seems fine” when things are working and “uh-oh” when a problem is suspected or even voice messages describing a possible fix “you have not told me what language to use in the ‘translator’ step”.
• Dragging the “BlueMail” service[0073]503 (an Internet mail service) to thecanvas303, we provide a mechanism to e-mail the result of the flow to an addressee. In this case, we set the to field512 to webahead@us.ibm.com. The fromfield515 was set to Web service capsule: email-test.wsfl. Thesubject field516 was set to Number2Text Translation Test. Finally we connected the output of theTranslator502 to the message input of thee-mail service503. Running the capsule at this point does the same as before but additionally sends an e-mail of the result to webahead@us.ibm.com.
• The final item we dragged to the capsule's[0074]canvas303 is the visualalert modifier518. The visual alert icon in one embodiment is available from the users'toolbar411. In other embodiments, the users' browser comprises a list of local programs that can be dragged onto the canvas and added to the flow in the same manner as web services from theweb services list302. Modifiers are items that interactively change flows. In this example thealert modifier518 simply generates an “alert” dialog with the result output of the mail service. It518 will alert the user to the success or failure of the Internet mail operation via an alert dialog. Other modifiers might take a string and convert it to an integer. (e.g. “001” becomes 1)
• Invoking/Using Capsules:[0075]
• Given a completed[0076]web service capsule303, it can be invoked in any of three ways. First it is run manually. This involves pressing a “play” button or the like. The second is invoking the capsule in a scheduled mode. For example, a service might be invoked on the hour every other hour. Third, a capsule is invoked by the SOAP server plug-in. The SOAP server plug-in provides two functions. One function is that it provides the ability to be queried as a UDDI server. When a client requests all of the open services/capsules the plug-in will return dynamically generated responses that follow the UDDI and WSDL standard. When the server is queried it will send the capsule name as the service name, the inputs as the input list determined by the first service to be called and the output as defined by the last service's output. Another function is that the SOAP plug-in acts as an interface to run capsules as if they were web services. The invocation happens when a request from an external client is made to the soap server plug-in which in turn invokes the specified capsule. It is in this way that capsules can be used as components for new capsules. Part of this invention is the IDS SOAP Bridge which provides similar functionality for IDS. IDS is a capsule based reporting environment. This IDS Soap bridge provides SOAP access to IDS. Because the bridge advertises itself as a web service, IDS capsule(s) may be integrated into capsule flows.
• Refer to FIG. 3, Web Service[0077]capsule builder GUI301, in the preferred embodiment comprises twoframes302303. One frame displays theService Listing302 of the available services that can be used to build the new capsule. The other frame displays thecapsule303 that will contain the interconnected services from the first frame when the capsule is completed.
• Refer to FIG. 4, an example of a preferred embodiment of a Service listing[0078]302 shown. The service listing includes services401-406 that are available for encapsulation. In one embodiment, the services include a mixture of remote services and local web services. Each service in the list that can be dragged to the container is denoted with an icon. Some of theservices401402405 further include additional information about the service.
• Refer to FIG. 5,[0079]example Capsule303 that has been created by the present invention is shown. Three web services501-503 have been dropped into thecapsule303 and interconnected by the user. Alocal service518 has been dropped and connected to the output of thethird web service503.
• Refer to FIG. 6, Service Flow Initialization is portrayed. A UDDI server is queried for[0080]available services601. The result of the query is used to update the local service catalog with candidateweb service icons602. The local service catalog is available to the user to selectively add services to theservice listing302.
• Once a new service flow is created[0081]603 in thecapsule303 it is saved in alocal file604 for future use. In the preferred embodiment the new flow is described in WSFL language which is XML based. The named capsule is optionally added to theservice listing302 as a new service flow that can be dragged to anew capsule303.
• An example of creating a Service Flow capsule is shown in FIG. 7. a[0082]new capsule303 is opened701 in aGUI display301. a first service is dragged and dropped702 to thecapsule303. A second service is dragged and dropped703 to thecapsule303. The output of the first service is connected704 to the input of the second service. Options for the second service are elected705. A third service is dragged and dropped706 to thecapsule303. The input of the third service is connected707 to the output of the second service. A fourth service that is a local service is dropped708 to the capsule and connected to the third service. The capsule is completed. It can be run manually709 to verify it's functionality.
• Executing a Service Flow is shown in FIG. 8. A service flow is opened[0083]801 and depicted by a GUI display. The flow can be run802 by pressing a GUI “Play”button420 or by a SOAP server plug-in803.
• An example web Service Flow SOAP Server Plug-in operation is depicted in FIG. 9. A request for a capsule is received[0084]901. The namespace is checked against locally knownservices902. If no capsule is found, an exception is reported. If a capsule is found903 and is not loaded, the capsule is loaded from itssource905. When the requested capsule is loaded, it can be executed906 and the result of it's execution is returned907.
• WSDL Generation of Web Service Flow FIG. 10. A request for a named capsule “WSDL” is received[0085]1001. The namespace is checked against knownservices1002. if no capsule is found1003, an exception is reported. If a capsule is found but not loaded1004, it is loaded1005. An optional check of the capsule outputs andinputs1006 is performed and dynamically generated “WSDL” is returned1007.
• IDS Soap Bridge flow is depicted in FIG. 11. A request for “IDS” operation is received[0086]1101. An operation request to the “IDS” system is submitted1102. An “IDS” object or specified data type is returned1103 and an optional tracking token for asynchronous operation is returned1104.
• Retrieving Asynchronous Requests via ISB is depicted in FIG. 12. A request for “IDS” operation via tracking token is received[0087]1204. The “IDS” server operation is checked1205. If no operation by that token is permitted1206, an exception is reported. If operation by that token is permitted, an “IDS” object or specified data type is returned1207. Optional percent of completion1108 information is returned.
• In the CD attachment, an example implementation is provided. A brief description of the files follows:[0088]
• Block.java==This class provides the basic implementation of a building block of a web service.[0089]
• DragTree.java==This class provides the tree component where the service objects can be dragged from.[0090]
• FlowPane.java==This class implements the work area where the user can drag and drop a web service object or set the properties of the web service object.[0091]
• FTPSettingDialog.java==This class provides the dialog for the user to set the FTP site from which the web services can be imported.[0092]
• HTTPSettingDialog.java==This class provides the dialog for the user to set the HTTP site from which the web services can be imported.[0093]
• ImportWSDLDialog.java==This class provides the dialog wizard for the user to select the place to import the web service.[0094]
• Link.java==This class implements the linkage component between the web services objects.[0095]
• Operation.java==This class provides the representation of a web service method call.[0096]
• ParamInputDialog.java==This class provides the dialog for setting the parameters to a web service method call.[0097]
• Presenter.java==This class implements the component to show the output of the web services workflow. It can be drag-and-dropped and connected to the final exit point of the workflow. The output can be text, voice or image.[0098]
• PresenterButton.java==This class implements a Button that's on the toolbar and can be drag-and-dropped in the working area and then appear as an output panel.[0099]
• ProxySettingDialog.java==This class implements the dialog where a user can set the proxy to access the Internet.[0100]
• Service.java==The core class that represents a web service object.[0101]
• UDDIList.java==This class lists the web services from UDDI.[0102]
• UDDISettingDialog.java==This class provides the dialog to set up the interface with UDDI.[0103]
• UDDIShowDialog.java==This class provides a dialog that shows the web services of a selected UDDI repository.[0104]
• WorkFlow.java==This class represents one workflow that has a collection of interconnected building blocks such as web services objects, output components, XML transformers.[0105]
• WorkFlowFrame.java==This class represents an internal frame that contains one FlowPane.[0106]
• WorkFrame.java==This class provides the GUI environment of the system including menus, toolbar, canvas.[0107]
• WorkSpace.java==This class represents the workspace that consists of a collection of workflow.[0108]
• XMLFilter.java==This class implements the XML transformer that can transform the output of a web service to a desired format.[0109]
• XMLFilterButton.java==This class implements a button that can be dragged into the canvas to create an XML transformer.[0110]
• Several applications of the capsules created according to the present invention are proposed. In one embodiment, a web capsule according to the present invention is invoked by a remote request received via a network protocol, for example, SOAP, RPC, HTTP.[0111]
• In another embodiment, elements of a capsule do not prevent successful execution of the capsule and/or response to an external request.[0112]
• In another embodiment, a capsule according to the present invention is integrated to remote applications by providing a WSDL representation to remote applications. Such WSDL can be dynamically generated.[0113]
• In another embodiment icons are joined with capsule modifiers. Capsule modifiers can express logical NOT, AND, OR, XOR, NOR, NAND. Furthermore capsule modifiers can include parallel, switch and data joining.[0114]
• Capsule web services according to the present invention are made up of one or more resources (resources could be other web services, switch/parallel paths and other “built in” functions such as GUI alerting or media playing), which are enhanced by providing a method of invoking capsule flows from external (remote) resources. The following example describes how a remote system/user might interact with the current invention to leverage the web service capsule flow.[0115]
• A capsule flow is invoked from a remote computer. The remote computer communicates to the host computer using a network protocol. In a preferred implementation the remote computer is able to make a series of “calls” requesting a list of available service capsules and specific details on how to invoke specific capsules or an actual request to invoke a capsule. These “call” transactions are preferably SOAP over HTTP as per open current art standards.[0116]
• A remote computer queries the capsule environment for a listing of available web service flows. The remote computer preferably sends a general request for all capsules available. This query is optionally more specific, such as requesting only all capsules that start with the letter “A” for example. The response back from the host server is a listing of services that match the initial query. Preferably, this would be done using UDDI queries and responses.[0117]
• A remote computer in one embodiment queries on a specific capsule hosted in the capsule environment. The remote computer sends a query specifying the specific identifier for the capsule service. The response from the host system is a document that defines the inputs and outputs of the given service capsule in enough detail to make subsequent invocation requests to the host system. Preferably the response uses the WSDL standard to fully describe the capsules expected inputs and outputs.[0118]
• A remote computer invokes a capsule service flow hosted in a capsule environment. The remote computer specifies the specific capsule service it wants invoked and any parameters needed as specified by the previous call for the service description (WSDL). The response to the invocation request is defined by the service description. In a preferred implementation this transaction uses SOAP over HTTP and WSDL to communicate and describe.[0119]
• For Example:[0120]
• Computer A queries Computer B requesting all available services (capsule flows). Computer B responds with a listing of available capsule web service flows. Computer A decides to use Service A on Computer B. Computer A makes the proper call to Computer B invoking the capsule flow (Service A) as a web service. Computer B executes the capsule flow and returns the result to Computer A.[0121]
• In one embodiment, the web capsule of the present invention is externally integrated and is visually designed, configured and managed at the client side or at the server side.[0122]
• Remote access to capsules via a web service interface is preferably done using SOAP over HTTP. In a preferred implementation the server mimics the HTTP protocol, responding appropriately to any well formed request. When a message targets a capsule service, the server, returns an error if it is not a properly formatted SOAP message. The message flow of this server is managed via the same drag-and-drop interface used to build capsules.[0123]
• FIG. 13 represents a server event flow of an Apache web server. It is an example of how servers often have a series of steps that need to be fulfilled to generate a response. Servers or flows like this one are able to leverage the capsule concept to provide high customizability and flexibility. For each step in a flow a user would drag and drop an icon to complete the system. For example a custom authentication mechanism might be developed where in it is dragged an dropped at the point which authentication is meant to occur. Another icon that does content encoding might be dragged and dropped at the end of the flow. Content encoding takes a set of data and encodes it a specific way. In this case it might apply a compression algorithm. Moreover, these icons might actually represent and execute other flows. For each step in the Apache flow as represented by FIG.[0124]13, a module would be represented. This flow is considered a linear flow.
• Referring to FIG. 13, the following set of events describes a simple HTTP server flow; receive[0125]message1302, parsemessage1304, check for requested resource, respond tomessage1310. Of course, any event flow can be managed using the capsule desktop as defined by Rogers et al. One of the drag-and-drop modules provided might be an authentication handler. In a preferred embodiment, the server flow receives a request message, decodes it, checks to make sure the resource exists and then responds to the request. It is desirable to restrict access to certain requests. Dragging and dropping an authentication handler (module) into the flow would provide this functionality. The flow becomes: receiverequest1302, parsemessage1304,check authentication1306, checkresource1308 and then respond1310. The flow could also have been done in a different order: receive request, parse, check response, check authorization and then respond. Moreover, check authorization and check resource could process in parallel if desired. Theresponse module1310 would simply take, as input, the results of the two “check” modules to determine the appropriate response.
• As shown in FIG. 13, a[0126]request1301 is processed and becomes apost-read request1302. The request is translated1303 and the header is parsed1304. After theaccess control1305,authentication1306 andauthorization1307 is checked. The file mime type is checked and the results pass through the Fix-up stage. Theresponse1310 is sent to therequest1301 and logged1311. Cleanup is performed1312 and the system waits1313 for a new request. At each stage, the progress is logged1311 as shown.
• In one embodiment, the web capsule is run in a remote machine. The other machine is clustered or grid enabled.[0127]
• In one embodiment, having created a web service capsule according to the present invention, the capsule is executed on remote capsule enabled servers. A user drag and drops the capsule onto an area of the capsule desktop to enable a network connection. Drag and drop is only one way to initiate the network connection. It is also possible to simply create a network connection and issue the request.[0128]
• The communication from the local desktop to a remote server involves a network connection to one or more servers using a network protocol. In the preferred implementation this network connection would use SOAP over HTTP.[0129]
• Remote servers are individually represented or ganged up as a generic “server ether”. The user drag and drops a selected capsule flow onto an icon representing either one of the individual remote servers or a clustered grouping. This initiates a network request to process the web service capsule. In a preferred implementation a clustered grouping randomly chooses a server on which to execute, or optionally executes the capsule on each of the servers.[0130]
• The capsule is then sent to the remote server(s) for execution. In a preferred implementation the capsule is described in an XML message that includes the identity of the necessary components and which web services to invoke, where the web services can be found, and in what order they are to be invoked and which results are passed to which web services.[0131]
• In one embodiment, the result is the result of the last executed service in the flow. This is similar to what a remote access to a capsule would be like. In another embodiment, the result may be a document that captures every request and response message of the flow so that the events can literally be played back on the local machine. In a preferred implementation the latter response is also encoded in XML and contains raw SOAP envelopes with time encoding to accurately capture remotely executed flows.[0132]
• Web service flows in one embodiment are executed serially (Shown in the Capsule in FIG. 14). A[0133]single record1401 supplies information to asummation icon1402, then anaverage icon1403 and finally amedian icon1404 and the results are provided by theresult icon1405. Each icon is personalized to perform a desired function including “null” which passes the record on to the next stage.
• Web service flows in one embodiment are executed in parallel. This function is provided by capsule modifiers.[0134]
• In one embodiment, a parallel execution modifier is provided (FIG. 14). Given a single[0135]web service call1501, multiple parallel paths maybe followed. The result of one or more paths is then assimilated1505, either through another web service call/capsule or via a data normalizer. A data normalizer takes multiple data inputs and formats it in a usable way. For example: if thesum1502, median1504 and average1503 are taken of a set of data, all calculated in parallel, apreferred normalizer1505 is configured to only save the lowest number. In another example: theresults1506 from all the paths are stored as the final result of the service call. In a preferred implementation thisresult1506 is an XML document representing the data structure as defined by the results of the capsule flows. In a preferred implementation either of the above modifiers follow the pattern of other widgets provided by the capsule environment, such as an alert dialog.
• More complex flows might involve parallel function (FIG. 15). FIG. 15 shows a statistical set of operations performed on the same set of data. In this case the summation, median and average are individual web services meant to be run on a single set of data. The data does not change and the outputs from one service does not flow as input to another. The capsule has been arranged to execute the web services in parallel. This is done by linking the originating input to the each of the services. The results are the input to a consolidation function which joins the data. Parallel execution can optimize the overall performance of the capsule.[0136]
• In one embodiment, icons are interconnected by drawing interconnect lines using a GUI display pointer such as a mouse. In another embodiment, icons are interconnected by selecting interconnect functions on a display tool bar or by means provided with each icon.[0137]
• In one embodiment, a[0138]modifier block1506 is used. In an example FIG. 15, a modifier block is an icon that is dragged to the capsule. Afirst icon1501 is connected to input A of the block and outputs C, D and E are connected to their respective block1502-1504. Such a block may have multiple inputs and multiple outputs. The block may have predetermined function (interconnections) or may be a functional icon performing switching, filtering, monitoring or any number of useful services in addition to flow interconnection.
• A user would drag and drop service icons where appropriate linking the originating input to the multiple branches. Using a data consolidation modifier or other web service capsule, the outputs of the branches are unified into a single result. In one embodiment this result is XML.[0139]
• Further distribution of function can be obtained when multiple operations are needed to be performed on either the same or different data sets. FIG. 16 shows an solution to having multiple sets of data needing the same statistical generation. Because the number of data sets is more than one the flow can leverage other capsule servers to execute the original parallel queries. This leverages the parallel function in the capsule flow, but also distributes the service capsule execution onto multiple capsule servers.[0140]
• Web service flows in another embodiment are executed with switch functionality. This function is provided by capsule modifiers.[0141]
• In one embodiment FIG. 18, a[0142]switch modifier1802 is provided. Theswitch modifier1802 checks a given variable or state of events to determine on which path to continue execution. For example: The result of a web service call is one of three different values. Depending on the value of this call different paths of execution are followed. For example, result A branches to the first path, result B branches to the second path and result C follows the third path. There are other possibilities and the invention is by no means limited by this example. In the example of FIG. 18, the record is provided1801 to aswitch1802 that determines whether to perform a graphing or summation operation. The switch then sends the message to either thesummation icon1803 or the graphing icon1804 (or both) according to theswitch1802 personality. The results are consolidated1805 and reported.
• The switch function provides another way of controlling the branching of a capsule based on a value or state of the flow (FIG. 18). Given another statistical example, the incoming request can be made to indicate summation or a graphical representation of the data. Using the switch modifier provides a branching mechanism, unlike the parallel function, where each path is followed through. Switches provide a single capsule capable of returning multiple results. Furthermore, it provides the ability for flow designers to execute different branches if a certain condition exists. For example, a capsule designer might decide that different branches should be executed based on the time of day. The capsule designer generates their flows and uses the switch modifier to join them. The condition in the capsule modifier might be set to test if the time is AM or PM. Depending on the result one of the branches gets executed. This is a simplistic example but illustrates the point that the switch can be triggered by any number of events, outputs from other capsules, time and an argument passed as part of execution.[0143]
• In another embodiment FIG. 16, a[0144]record1601 can be executed serially (Summation1602, average1603, then median1604) by any of several paths in parallel with other records executed serially in another of the paths (Summation1612, average1613, then median1614).
• In another embodiment, parallel execution of a[0145]record1701 is indicated by providing multiple interconnect lines to theparallel icons170217031704 and the result is consolidated1705 by connecting the output of the parallel icons to theresult icon1705.
• While the preferred embodiment of the invention has been illustrated and described herein, it is to be understood that the invention is not limited to the precise construction herein disclosed, and the right is “reserved” to all changes and modifications coming within the scope of the invention as defined in the appended claims.[0146]

Claims (51)

What is claimed is:

1. A method for creating computer programs in a web service environment, the method comprising the steps of:

moving a first representation of a first web service program into a GUI displayed partition;

moving a second representation of a second program into the GUI displayed partition; and

interconnecting the first representation with the second representation using GUI functions wherein the first web service program programmably communicates with the second program to perform a desired operation.

2. The method according toclaim 1 comprising the further steps of:

selecting any one of the first representation or the second representation using the GUI functions; and

setting parameters of the selected representation using the GUI functions.

3. The method according toclaim 1 wherein the GUI functions comprise any one of a mouse, a mouse button, a keyboard, a touch-screen, a touch pad, speech recognition technology, cursor positioning or a light pen.

4. The method according toclaim 1 wherein any one of the first representation or the second representation is a displayed icon.

5. The method according toclaim 1 wherein the moving the representation function is drag and drop.

6. The method according toclaim 2 wherein the setting parameters step comprises the further steps of:

initiating a display of parameter options using the GUI function;

operating on the display of parameter options according to a predetermined plan; and

exiting the display of parameter options.

7. A method according toclaim 1 comprising the further steps of:

initiating a test of the interconnected representations; and

highlighting the first representation to indicate functional state.

8. The method according toclaim 7 wherein highlighting indicates any one of idle, functional, error or warning.

9. The method according toclaim 7 wherein highlighting is by way of any one of color, brightness, text message, shape altering or audio message.

10. The method according toclaim 1 comprising the further step of saving the first representation and the second representation and interconnection as a capsule representation.

11. The method according toclaim 10 wherein the capsule representation is placed on a user's menu as a third representation of a program.

12. The method according toclaim 1 comprising the further steps of:

creating the first representation of the first web service; and

placing the created first representation on a user's menu.

13. The method according toclaim 12 wherein the first representation is moved from any one of the user's menu, a web page or a pull down system created menu.

14. The method according toclaim 1 wherein the first representation is created from WSDL supplied by the web service.

15. The method according toclaim 1 wherein the interconnecting step comprises UDDI integration.

16. The method according toclaim 1 wherein the desired operation comprises creating any one of an audio file, video file, text viewable file, external program execution, graphical user interface change or graphical user interface dialog.

17. The method according toclaim 1 wherein the second program is a web service program.

18. A computer program product for creating computer programs in a web service environment, the computer program product comprising a computer readable medium having computer readable program code therein comprising:

computer readable program code for moving a first representation of a first web service program into a GUT displayed partition;

computer readable program code for moving a second representation of a second program into the GUT displayed partition; and

computer readable program code for interconnecting the first representation with the second representation using GUT functions wherein the first web service program programmably communicates with the second program to perform a desired operation.

19. The computer program product according toclaim 18 further comprising:

computer readable program code for selecting any one of the first representation or the second representation using the GUI functions; and

computer readable program code for setting parameters of the selected representation using the GUI functions.

20. The computer program product according toclaim 18 wherein the GUI functions comprise any one of a mouse, a mouse button, a keyboard, a touch-screen, a touch pad, speech recognition technology, cursor positioning or a light pen.

21. The computer program product according toclaim 18 wherein any one of the first representation or second representation is a displayed icon.

22. The computer program product according toclaim 18 wherein the moving the representation computer readable program code comprises drag and drop.

23. The computer program product according toclaim 18 wherein the setting parameters computer readable program code further comprises:

computer readable program code for initiating a display of parameter options using the GUI function;

computer readable program code for operating on the display of parameter options according to a predetermined plan; and

computer readable program code for exiting the display of parameter options.

24. A computer program product according toclaim 18 further comprising:

computer readable program code for initiating a test of the interconnected representations; and

computer readable program code for highlighting the first representation to indicate functional state.

25. The computer program product according toclaim 24 wherein highlighting indicates any one of idle, functional, error or warning.

26. The computer program product according toclaim 24 wherein highlighting is by way of any one of color, brightness, text message, shape altering or audio message.

27. The computer program product according toclaim 18 further comprising computer readable program code for saving the representations and interconnection as a capsule representation.

28. The computer program product according toclaim 27 wherein the capsule representation is placed on the user's menu as a third representation of a program.

29. The computer program product according toclaim 18 further comprising:

computer readable program code for creating the first representation of the first web service; and

computer readable program code for placing the created first representation on a user's menu.

30. The computer program product according toclaim 29 wherein the first representation is moved from any one of the user's menu, a web page or a pull down system created menu.

31. The computer program product according toclaim 18 wherein the first representation is created from WSDL supplied by the web service.

32. The computer program product according toclaim 18 wherein the computer readable program code for interconnecting comprises computer readable program code for UDDI integration.

33. The computer program product according toclaim 18 wherein the desired operation comprises computer readable program code for creating any one of an audio file, video file, text viewable file, external program execution, graphical user interface change or graphical user interface dialog.

34. The computer program product according toclaim 18 wherein the second program is a web service program.

35. A system for creating computer programs in a web service environment, the system comprising:

a mover moving a first representation of a first web service program into a GUI displayed partition;

the mover moving a second representation of a second program into the GUI displayed partition; and

an interconnector interconnecting the first representation with the second representation using GUI functions wherein the first web service program programmably communicates with the second program to perform a desired operation.

36. The system according toclaim 35 further comprising:

a selector selecting any one of the first representation or the second representation using the GUI functions; and

a parameter setter setting parameters of the selected representation using the GUI functions.

37. The system according toclaim 35 wherein the GUI functions comprise any one of a mouse, a mouse button, a keyboard, a touch-screen, a touch pad, speech recognition technology, cursor positioning or a light pen.

38. The system according toclaim 35 wherein the first representation or second representation is a displayed icon.

39. The system according toclaim 35 wherein the moving the representation function is drag and drop.

40. The system according toclaim 36 wherein the parameter setter further comprises:

a display initiator initiating a display of parameter options using the GUI function;

an operator operating on the display of parameter options according to a predetermined plan; and

an exiter exiting the display of parameter options.

41. A system according toclaim 35 further comprising:

an initiator initiating a test of the interconnected representations; and

a modifier highlighting the first representation to indicate functional state.

42. The system according toclaim 41 wherein highlighting indicates any one of idle, functional, error or warning.

43. The system according toclaim 41 wherein highlighting is by way of any one of color, brightness, text message, shape altering or audio message.

44. The system according toclaim 35 further comprising a representation saver saving the representations and interconnection as a capsule representation.

45. The system according toclaim 44 wherein the capsule representation is placed on the user's menu as a third representation of a program.

46. The system according toclaim 35 further comprising:

a creator creating the first representation of the first web service; and

menu placer placing the created first representation on a user's menu.

47. The system according toclaim 45 wherein the first representation is moved from any one of the user's menu, a web page or pull down system created menu.

48. The system according toclaim 35 wherein the first representation is created from WSDL supplied by the web service.

49. The system according toclaim 35 wherein the interconnector further comprises UDDI integration.

50. The system according toclaim 35 wherein the desired operation comprises creating any one of an audio file, video file, text viewable file, external program execution, graphical user interface change or graphical user interface dialog.

51. The system according toclaim 35 wherein the second program is a web service program.

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