KR20070072308A - Web service obtaining method using distributed object oriented programming middleware system on grid and web service offering method using the same - Google Patents

Abstract

A web service obtaining method applying a grid object-oriented programming middleware system and a web service providing method using the same are provided to enable each distributed object to use a web service by applying object-oriented programming to grid computing to efficiently manage information while supporting various programming. An object manager and the object of the grid distributed object-oriented programming middleware system are generated, and the object of the middleware system is registered to the object manager(320). The object of the middleware system requests reference for an agent object from the object manager(330). The object manager transfers the reference to the agent object to the object of the middleware system(340). The object of the middleware system obtains the web service by using the received reference to the agent object(350). The obtained web service is transferred to other objects wanting to obtain the same web service.

Description

Web service obtaining method using distributed object oriented programming middleware system on grid and Web service offering method using the same}

1 illustrates a grid object-oriented programming middleware system structure according to the present invention.

2 shows a system including an agent object according to the present invention.

3 is a flowchart illustrating a method of obtaining a web service by applying an agent object according to the present invention.

4 is a detailed flowchart illustrating a process of transmitting the reference of FIG. 3 to an object.

FIG. 5 is a detailed flowchart of a process in which the object of FIG. 3 obtains a web service.

6 shows a system including a dependent agent object in accordance with the present invention.

7 is a flowchart illustrating a method of obtaining a web service by applying a dependent agent object according to the present invention.

8 is a detailed flowchart of a web service acquisition process of FIG. 7.

9A illustrates a system including an interface object in accordance with the present invention.

9B illustrates a system for providing a web service in connection with an external web server according to the present invention.

10 is a flowchart illustrating a method for providing a web service by applying an interface object according to the present invention.

FIG. 11 is a detailed flowchart illustrating a process of providing a web service to an external user of FIG. 10.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to grid computing, and more particularly, to a method for obtaining a web service and a method for providing a web service using an object-oriented programming middleware system.

The grid, derived from the 'lattice' that controls the flow of current between the cathode and anode of a vacuum tube, is a bridge between the World Wide Web and the next-generation Internet, the catalyst for the spread of the Internet. Grid began with the principle of installing a specific program on a computer, connecting advanced computer database equipment around the world and remotely controlling it with a personal computer. In short, the concept is to connect computers around the world to the Internet and use them as supercomputers.

Grid is a pan-network principle that builds virtual supercomputing power. The core of virtual supercomputing is that virtual supercomputers that control and connect hundreds of millions of PCs and high-tech equipment scattered around the world can perform better than current supercomputers. Idle resources can be used to easily process large amounts of data while significantly reducing costs.

The grid targets 4A. 4A includes advanced networks, advanced computers and equipment, advanced applications, and advanced technology. Intelligent networks are concepts that include high-performance middleware and artificial intelligence browsers, including optical cables.

Middleware is a program that acts as a mediator and intermediary between system software and application software or between two different kinds of applications. It is to optimize the connection between the application, data and web server distributed in the system. It also exists between the client (user) program and the server program, and maintains and manages the connection between the client and the server. It plays various roles such as communication between client and server as well as load balancing, transaction processing, and security for multiple clients.

Recently, middleware has been applied to connect databases and web servers. It can also be used to display forms in a web browser, use them to retrieve data from a database, or display dynamic pages based on the user's request. Middleware in the enterprise is mainly system software that prevents the downtime of the enterprise computer network. It refers to the middle person between the customer and the server to use the application or resource on the server. Using this software, the computer network does not crash even if the load exceeds the data processing capacity of the existing server.

However, grid computing must deal with remote computer resources, and the system configuration of each computer is not unified. In addition, the conventional grid computing technology and the object-oriented programming technique have to have all the initial resource information in the use of resources, so the resource information is first obtained, the object is created within the limitation, and the operation is performed through the communication between objects. .

Therefore, there is a problem in that the grid computing environment to which the conventional middleware program is applied is inefficient in resource utilization and information exchange between objects.

Therefore, the first technical problem to be achieved by the present invention is object-oriented programming middleware that each distributed object can use a web service by applying object-oriented programming to grid computing to enable efficient information management while supporting various programming development It is to provide a web service acquisition method applying the system.

The second technical problem to be achieved by the present invention is to provide a web service providing method applying a grid object-oriented programming middleware system.

The present invention to achieve the first technical problem,

Creating an object manager and an object of a grid distributed object-oriented programming middleware system and registering an object of the system with the object manager; Requesting, by an object of the grid distributed object-oriented programming middleware system, a reference to an agent object from the object manager; The requested object manager passing a reference to the agent object to an object of the grid distributed object-oriented programming middleware system; And an object of the grid distributed object-oriented programming middleware system obtaining a web service by using the received reference to the agent object.

The present invention to achieve the first technical problem,

Creating an object manager and an object of a grid distributed object-oriented programming middleware system and registering the object with the object manager; Creating a servant object and a local agent object of the system; Registering a reference to the local agent object with the servant object; And obtaining, by the servant object, the web service from the reference of the registered agent object.

The present invention to achieve the second technical problem,

Creating an object manager and an application object of a grid distributed object-oriented programming middleware system and registering an application object of the system with the object manager; Creating, by the object manager, an interface object and registering the interface object with the object manager; Registering a web service to be provided by the interface object on a web service exchange; And providing a web service by the interface object when there is a request of an external user for a web service registered on the web service exchange.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings, but the present invention is not limited thereto.

1 illustrates a grid object-oriented programming middleware system structure according to the present invention. The grid object-oriented programming middleware system includes an application layer 100, a service layer 110, a runtime system layer 120, a grid service interface layer ( 130, and a resource layer 140.

The application layer 100 is composed of interactive application objects 101, 102, 103, 104 based on the grid object oriented programming middleware system interface 105. Application objects 101, 102, 103 and 104 are coded and defined by the user.

The service layer 110 is located between the application layer 100 and the runtime system layer 120 and provides an object manager 111 and a monitor object 112 that provide system services of object creation, naming service, and resource allocation. ). The object manager 111 provides important services including object creation and naming service, and provides a clear and easy operation environment. The object managers configure object groups to determine parallel program environment areas. The monitor object 112 is a component that monitors the activity of the objects of the grid object-oriented programming middleware system. Therefore, the user allocates resources through the monitoring of the grid object-oriented programming middleware system.

The runtime system layer 120 is comprised of three layers: method call layer 121, message passing layer 122, and communication layer 123. The method call layer 121 aligns each call structure into a call message, registers the message in the call table to properly handle the response message, and then passes the message to the message passing layer 122. The message passing layer 122 performs the same role as an adapter connected with the communication layer 123. And it is responsible for separating the method call layer 121 and the communication layer 123 to deliver a unique interface for message delivery to the method call layer 121. Message passing layer 122 forms the object name associated with the physical address and delivers the message to the distributed object using one of the communication layers 123. Each communication layer 123 performs each distributed protocol using a different interface and naming structure system.

The interface layer 130 of the grid object oriented programming middleware system is composed of several grid service objects 132 to which the grid object oriented programming middleware system interface 131 is applied. The Greek service object 132 can be used to directly interact with grid services provided by the Globus toolkit. Transfer Protocol). GSO_GRAM handles resource allocation needs using the GRAM service, which allows users to perform tasks remotely. The GSO_MDS provides information about the grid resource 151 from the resource layer unit 150 using a meta directory service (MDS). GSO_FTP leverages Global Access of Secondary Storage (GASS) to deliver user programs or files to remote hosts. Accordingly, the grid service object 132 may provide other objects with the grid service 141 provided by the grid service layer 140.

2 shows a system comprising an agent object according to the present invention.

The Distributed Object-oriented Virtual Computing Environment on Grid (DOVE-G) creates an Object (200) and an Object Manager (210) and creates an object in DOVE-G. 200 requests an object manager 210 to create an Agent Object 220. Upon request, the Object Manager 210 creates an Agent Object 220. The generated Agent Object 220 is an object. Register with the manager 210 and the object manager 210 passes the reference of the agent object 220 accordingly to the DOVE-G object 200. Based on the reference, the DOVE-G object 200 is the agent object 220 ), The agent object 220 requests the web service 230 according to the call, and the agent object 220 obtains the result of the web service 230 according to the request to the DOVE-G object 200. Will be delivered.

3 is a flowchart of a method for obtaining a web service using an agent object according to the present invention.

Web service means to build and service a specific infrastructure on a server to satisfy the requirements of users who connect to the Internet. Web services from the point of view of a web service developer or provider are described above. Refers to a system environment in which web services can be built.

First, an object manager of the grid distributed object-oriented programming middleware system DOVE-G is generated (step 300). To create a DOVE-G object manager and to operate the system, initialize the DOVE-G system. DOVE-G system initialization involves creating and initializing three layers of the runtime system so that DOVE-G objects can communicate with each other. When this system is initialized, the DOVE-G object manager is created. The object manager manages DOVE-G objects.

Initialize the system, create a DOVE-G object manager, and then create a DOVE-G object (step 310).

The object of the system is registered in the object manager (step 320). In a distributed virtual computing environment, an object manager registers information according to an object's access of a system to an object manager and communicates with the object manager through this information.

The DOVE-G object requests a reference to the agent object from the object manager (step 330). If any of the DOVE-G objects want to use the web service, the process of requesting a reference to the agent object from the object manager. Accordingly, the object manager determines whether there is an agent object for the object that wants to use the web service.

In response to the request of the DOVE-G object, the object manager transmits a reference to the agent object to the DOVE-G object (step 340). In response to a request from a DOVE-G object, the object manager requests a reference to an agent object. If an agent object exists at the request of a DOVE-G object, a reference to the agent object is passed to the DOVE-G object. If the agent object does not exist at the request of the DOVE-G object, an agent object is created. A person who wants to acquire a web service acquires information of a web service to be obtained from a web service exchange (Universal Description, Discovery, and Integration: UDDI) when creating an agent object. Agent object is created based on the contents of Web Services Description Language (WSDL) obtained from the acquisition of the information of the web service. Pass a reference to the created agent object to the DOVE-G object.

The DOVE-G object requesting a reference to the agent object obtains a web service using the reference of the agent object transferred from the object manager (step 350). That is, the DOVE-G object applies a user code to call an agent object to request a web service. Agent object creates web service stub, and web service stub obtains web service requested by DOVE-G object through web service description language obtained from UDDI and sends web service to agent object. Passes the received web service to the DOVE-G object.

4 is a detailed flowchart of a process of transferring a reference of FIG. 3 to an object (operation 340). The object manager receives a reference request for the agent object from the object of the grid distributed object-oriented programming middleware system (DOVE-G) (step 441).

The object manager receiving the reference request determines whether a reference to the agent object exists (S442).

If there is a reference to the agent object requested by the DOVE-G object, the object manager transmits a reference to the agent object to an object of the DOVE-G system (step 445).

If there is no reference to the agent object requested by the DOVE-G object, the object manager creates an agent object for the DOVE-G object (step 443) and registers the agent object with the object manager (step 444). . This prevents the system inefficiency of having to recreate the object manager for the same DOVE-G object by registering an agent object for the DOVE-G object with the object manager. This prevents duplicate creation by defining naming to the agent object when the agent object is created independently by the DOVE-G object. The DOVE-G object requesting a reference to the agent object obtains a web service using the reference of the agent object passed from the object manager.

FIG. 5 is a detailed flowchart of a process 350 of obtaining a web service by the object of FIG. 3.

The object of DOVE-G calls the agent object from the reference to the agent object of the grid object-oriented programming middleware system DOVE-G according to the present invention (step 551). This is the process of DOVE-G's object calling the agent object's web service related functions from a reference to the agent object.

The agent object called from the object of DOVE-G requests a web service (step 552). The agent object creates a web service stub to request a web service from a web service provider. Use a web service stub to request a web service from a reference in the web service description language.

The agent object acquires the result of the requested web service and delivers the result to the DOVE-G object (step 553). That is, the web service stub acquires the result of the requested web service and delivers the result of the web service to the agent object, and the agent object delivers the result of the received web service to the DOVE-G object.

6 shows a system including a dependent agent object in accordance with the present invention. The agent object is created as a local class of the DOVE-G object and calls the agent object according to the internal function flow of the DOVE-G object. Agent objects are defined as dependent agent objects because they are created with the local class of the DOVE-G object.

A distributed object-oriented virtual computing environment on grid (DOVE-G) creates an object manager 600, a first object 610, and a second object 620 and generates the first object. The 610 and the second object 620 are registered in the object manager 600. The first object 610 of DOVE-G attempting to acquire the web service 650 creates a servant object 630 and a local agent object 640 in the DOVE-G object. do. The local agent object 640 is registered with the servant object 630, and the local agent object 640 calls the web service 650 that the first object 610 of DOVE-G tries to acquire to obtain a web service. .

In addition, the second object 620 of DOVE-G attempting to acquire the same web service 650 is obtained by the first object 610 of DOVE-G through the object manager 600 without separately creating a local agent object. The same web service may be obtained by receiving one web service 650.

7 is a flowchart illustrating a method of obtaining a web service by applying a dependent agent object according to the present invention.

First, an object manager and an object of the grid distributed object-oriented programming middleware system (DOVE-G) are created (step 700). To create a DOVE-G object manager and to operate the system, initialize the DOVE-G system. DOVE-G system initialization involves creating and initializing three layers of the runtime system so that DOVE-G objects can communicate with each other. When this system is initialized, the DOVE-G object manager is created. The object manager manages DOVE-G objects. Initialize the system, create a DOVE-G object manager, and then create a DOVE-G object.

The created DOVE-G object is registered in the object manager (step 710). In a distributed virtual computing environment, an object manager registers information on accessing objects of a system to an object manager and communicates with the object manager through this information.

A servant object and a local agent object are created in the created DOVE-G object (step 720). If there is one of the DOVE-G objects that wants to use the web service, a servant object is created in the object and a local agent object that can interoperate with the web service. Use a web service through the created local agent object.

The reference of the local agent object of the DOVE-G is registered in the servant object (step 730). The reference of the local agent object is registered in the servant object and the related function is transmitted to the local agent object of the servant object through the user code in the DOVE-G object. Call

The called local agent object acquires a web service (step 740).

8 is a detailed flowchart of a web service acquisition process of FIG. 7.

The servant object in the DOVE-G object calls the local agent object (step 841). This is a process in which the servant object in the DOVE-G object calls the agent object related to the web service to obtain by applying the user code.

The called local agent object requests a web service (step 842). The local agent object creates a web service stub to request a web service from a web service provider. The web service stub is used to request a web service from a reference to the web service description language obtained when creating an agent object.

The local agent object acquires the result of the web service and delivers the obtained result to the DOVE-G servant object (step 843). That is, the web service stub obtains the result of the requested web service and delivers the result of the web service to the local agent object.

The local agent object sends the result of the received web service to the DOVE-G servant object (step 844).

9A illustrates a system including an interface object in accordance with the present invention. According to FIG. 9A, the object manager 900 and the application object 910 of the grid distributed object-oriented programming middleware system DOVE-G are created and the application object 910 is registered with the object manager 900.

The object manager 900 also creates an interface object 920, registers the interface object 920 with the object manager 900, and registers a web service to be provided by the interface object 920 with the web service exchange 930.

In response to this, an external user 940 attempting to obtain a web service retrieves a reference of an interface object for the web service through the web service exchange 930 to obtain a web service description language 950. The web server module 921 of the interface object 920 receives a Simple Object Access Protocol (SOAP) call for implementing a web service function from an external user 940 having obtained the web service description language 950. The web service implementation 922 of the interface object 920 converts the simple object access protocol message into a Remote Method Invocation (RMI) message. The stub 914 and the skeleton 924 of the interface object are responsible for exchanging references to each other and making a communication connection. Send the converted remote method call message to the application object skeleton 913 of the DOVE-G application object 910 using the application object stub 923, implement the web service functionality, and implement the application object skeleton. 913 sends the remote method call response to the application object stub 923, which the web service implementation 922 of the interface object 920 converts into a simple object access protocol response and sends it to the user 940. The user is provided with a web service 960 in this response.

9B illustrates a system for providing a web service in connection with an external web server. In the case of the interface object 970 which does not include the web server module 921, the web service is registered on the external web server 980, and the web service is registered on the web service exchange 990 to register the web service. to provide.

10 is a flowchart illustrating a method for providing a web service by applying an interface object according to the present invention.

The object manager of the grid distributed object-oriented programming middleware system DOVE-G is generated (step 1000). To create a DOVE-G object manager and to operate the system, initialize the DOVE-G system. DOVE-G system initialization involves creating and initializing three layers in the runtime system so that DOVE-G objects can communicate with each other. When this system is initialized, the DOVE-G object manager is created. The object manager manages DOVE-G objects.

Initialize the system, create a DOVE-G object manager, and create a DOVE-G application object (step 1010). The DOVE-G application object is the same object as the DOVE-G object.

The created application object is registered in the object manager (step 1020). In a distributed virtual computing environment, the object manager registers information according to an application object's access to the object manager and communicates with the object manager through this registration information.

The interface object is created and the created interface object is registered in the object manager (step 1030).

The web service to be provided by the interface object is registered on the web service exchange (step 1040). The web service exchange is a place for informing a user who wants to use a web service of the content of the web service to be provided as a transaction place for the web service.

Referring to FIG. 9A, when the interface object 920 includes the web server module 921, the web server module 921 of the interface object 920 is registered with the web service exchange 930 to provide a web service. In this case, since a single web service is provided by the web server module 921 of one interface object 920, a quick service can be provided.

Referring to FIG. 9B, when there is no web server module in the interface object and is registered and used in an external web server, the web server 980 registers a web service to be provided by the interface object 970 and the web server 980 is used. Register with the web service exchange 990 to provide a web service. In this case, various web services can be provided through one web server.

If there is a request from an external user for a web service registered on the web service exchange, the interface object provides the web service (step 1050).

FIG. 11 is a detailed flowchart of a process 1050 of providing a web service to an external user of FIG. 10. The interface object receives a simple object access protocol (SOAP) call from an external user who obtains the web service description language (step 1151).

The web service implementation of the interface object receiving the simple object access protocol call converts the simple object access protocol (SOAP) into a remote method invocation (RMI) message (step 1152).

The remote method call message is converted to the remote object call (RMI) to the application object (step 1153). That is, the application stub of the interface object sends the remote method call message to the application object skeleton.

The interface object provides a web service to an external user (step 1154). By using the application object stub to send the converted remote method invocation message to the application object skeleton of the DOVE-G application object, and implementing the web service function, the application object skeleton sends the remote method invocation response to the application object stub. . The web service implementation of the interface object converts the remote method invocation response into a simple object access protocol response and sends it to the user. The user is provided with a web service in this response.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical details of the appended claims.

According to the present invention, by applying object-oriented programming in a grid-based middleware system, providing a grid computing environment with a complex environment as a single computing environment, simplifying the development environment, an interface that is easy to access to users and efficient information management It is effective to provide.

In addition, according to the present invention, by applying object-oriented programming in a grid-based middleware system that supports interworking with web services that are easy to access, users can expand the spread of grid computing and apply it to various applications. It has the effect of providing and reducing costs.

Claims (12)

Creating an object manager and an object of a grid distributed object-oriented programming middleware system and registering an object of the system with the object manager; Requesting, by an object of the grid distributed object-oriented programming middleware system, a reference to an agent object from the object manager; The requested object manager passing a reference to the agent object to an object of the grid distributed object-oriented programming middleware system; And Obtaining a web service by an object of the grid distributed object-oriented programming middleware system using a reference to the received agent object. The method of claim 1, And delivering the obtained web service through an object manager to another object of the grid object oriented programming middleware system which tries to acquire the same web service as the obtained web service. Web service acquisition method applied. The method of claim 1, Delivering to an object of the system, And when a reference to the agent object exists in the object manager, transmitting a reference of the agent object to an object of the grid distributed object-oriented programming middleware system. How to Obtain a Service. The method of claim 1, Acquiring the web service, Calling an agent object from the reference by an object of the grid distributed object-oriented programming middleware system; Requesting a web service by the called agent object; And And obtaining, by the agent object, a result of the requested web service and transmitting the result to an object of the grid distributed object-oriented programming middleware system. The method of claim 3, wherein Delivering to an object of the system, Creating an agent object and registering the agent object with the object manager when there is no reference to the agent object in the object manager; And And transmitting a reference of the generated agent object to an object of the grid distributed object oriented programming middleware system. Creating an object manager and an object of a grid distributed object-oriented programming middleware system and registering the object with the object manager; Creating a servant object and a local agent object of the system; Registering a reference to the local agent object with the servant object; And And obtaining a web service by the servant object from a reference of the registered agent object. The method of claim 6, Acquiring the web service, The servant object calling a local agent object using user code of the grid distributed object-oriented programming middleware system; Requesting a web service by the called local agent object; And And obtaining, by the local agent object, the result of the requested web service and delivering the result to the servant object. Creating an object manager and an application object of a grid distributed object-oriented programming middleware system and registering an application object of the system with the object manager; Creating, by the object manager, an interface object and registering the interface object with the object manager; Registering a web service to be provided by the interface object on a web service exchange; And The web service providing method applying a grid object-oriented programming middleware system comprising the step of the interface object to provide a web service when a request of an external user for a web service registered in the web service exchange. About claim 8 The providing of the web service by the interface object may include: Retrieving a reference of the interface object through the web service exchange by an external user who wants to obtain the web service; And Providing a web service to an external user whose interface object has obtained a web service description language from the reference. About claim 8 Registering with the web service exchange , And registering the web server module of the interface object on the web service exchange if the interface object includes a web server module. About claim 8 Registering with the web service exchange, Registering a content of the web service to be provided with an external web server when providing a web service in connection with a web server outside the interface object; And And registering the web server on the web service exchange. About claim 9 Providing a web service to an external user who has obtained the web service description language, Receiving, by the interface object, a simple object access protocol call from an external user who has obtained the web service description language; The web service implementation of the interface object converting the simple object access protocol message into a remote method invocation message; Making a remote method call to the application object with the diverted remote method call message; And And providing, by an interface object receiving a response to the remote method call from the application object, a web service to an external user.

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