Web service control for use in a graphical programming environment

• US 20040017392A1
• Filed: 04/30/2003
• Published: 01/29/2004
• Est. Priority Date: 05/01/2002
• Status: Abandoned Application

• Current Assignee: National Instruments Corporation (Emerson Electric Company)
• Original Assignee: National Instruments Corporation (Emerson Electric Company)
• Inventors: Welch, Keith C.
• Application Number:
  US10/426,499
• Publication Number:
  US 20040017392A1
• Time in Patent Office: Days
• US Class Current: 345/738
• CPC Class Codes: G06F 8/34 Graphical or visual programming
• CPC Class Codes: G06F 8/38 for implementing user interfaces

Abstract

A web service program object is provided for use in developing application programs through a graphical program-development environment. The web service program object has a corresponding icon that can be placed within a graphical program representation and visually coupled to other program objects to define the logical operation of a desired application program. The web service program object has a plurality of publicly declared properties that may be set by the program developer to specify the Uniform Resource Locator (URL) of a selected web service and a given method of the selected web service. At run-time, the web service program object causes a proxy class to be created for accessing the web service. The web service program object in cooperation with the proxy class receives one or more input parameter values from the program user, provides those values to the selected web service and receives responding information from the web service. Depending on the manner in which the application program was created, the responding information from the web service can be handled in any number of ways, such as being displayed to the program user or stored for later processing.

Claims

1. A web service program object for use with a graphical programming environment, the web service program object comprising:

a graphical icon representing the web service program object for display in a diagramming window of the graphical programming environment, the graphical icon having one or more terminals for visually linking the web service graphical icon with one or more other icons, each corresponding to a program object, to visually represent an application program in two-dimensions;

a first property that is settable by a program developer to define a network address of a given web service having a description that identifies one or more methods available from the given web service;

web service access logic configured to access and retrieve the description of the given web service; and

description parsing logic configured to extract the one or more methods identified in the retrieved description of the given web service, wherein

the one or more extracted methods are presented to a program developer for selection.

2. The web service program object of claim 1 further comprising a proxy web service class generator configured to generate a proxy class of the given web service, the proxy class configured and arranged to communicate with the given web service.

3. The web service program object of claim 2 further comprising:

a second property that is settable by the program developer to define a name of the given web service; and

a third property that is settable by the program developer to define a method of the given web service, wherein

one or more of the network address, web service name and method are changeable at run-time of the application program.

4. The web service program object of claim 3 wherein the terminals include a data output terminal for use in visually representing the graphical icon of the program object to receive a result produced by the given web service.

5. A method for creating an application that consumes a web service disposed at a network address, the web service having a method and configured to generate an output, the method comprising the steps of:

providing a diagrammer window for receiving a plurality of graphical icons, each graphical icon corresponding to a program object that executes a function;

providing a graphical web service icon for receipt on the diagrammer window, the web service graphical icon corresponding to a web service program object whose function is to consume the web service;

configuring the web service program object with the network address and the method of the web service; and

visually associating the graphical web service icon with a second graphical icon whose function receives the output of the web service, wherein

at application run-time, the web service program object accesses the web service, receives the output and causes the output to be provided to the program object corresponding to the second graphical icon.

6. The method of claim 5 wherein the web service has one or more input parameters from which the output is generated, the method further comprising the step of generating a parameter entry page at application run-time for receiving the one or more input parameters that are needed by the web service to generate the output.

7. The method of claim 6 further comprising the steps of:

sending the one or more received input parameters to the web service; and

receiving the output from the web service generated in response to the received input parameters.

8. The method of claim 5 wherein the web service has a plurality of methods, the method further comprising the steps of:

accessing a description of the web service, the description containing the plurality of methods;

parsing the description to identify the plurality of methods; and

presenting the plurality of methods to a program developer for selection.

9. The method of claim 8 wherein the web service has one or more input parameters associated with each method, the description further containing the input parameters, the method further comprising the steps of:

parsing the description to identify the one or more input parameters associated with the selected method; and

presenting the one or more input parameters associated with the selected method to the program developer.

10. The method of claim 5 further comprising the steps of:

generating a web service proxy class for interfacing with the web service at application run-time.

11. The method of claim 10 wherein the web service proxy class is created by the web service program object.

12. The method of claim 5 further comprising step of changing the network address of the web service at run-time.

13. The method of claim 12 further comprising the step of changing the web service method.