KR20060114517A - Framework for building web applications and their web servers - Google Patents

Abstract

The present invention relates to a framework for building a web application for e-business and a server equipped with the same. The framework for building a web application according to the present invention receives an application request from a client and requests for presentation and business logic. A first module for classifying and delivering the request for execution; A second module that executes the corresponding business logic in response to a request for executing the business logic received from the first module; And a third module constituting a screen of a corresponding web page to be provided to a client according to a request for presentation received from the first module. As a result, it is possible to obtain an integrated environment for building web applications that is easy to improve, maintain, and expand development productivity.

Description

Framework for building a web application and a web server

1 is a view for explaining a problem of a conventional web application,

2 is a view for explaining the problem of the conventional web application framework,

3 is a view for explaining the features of the web application framework according to the present invention;

Figure 4 is an embodiment of the configuration of a web server equipped with a web application framework according to the present invention,

5 is another embodiment of a configuration of a web server equipped with a web application framework according to the present invention;

6 is a detailed configuration diagram of a web application framework according to the present invention;

7 is a detailed configuration diagram of a development tool for a web application according to the present invention;

8 is a detailed configuration diagram of a management tool for a web application according to the present invention;

9 is a view for explaining the operation of the resource pool included in the web application framework according to the present invention;

10 is a view for explaining the operation of the controller included in the web application framework according to the present invention;

11 is a view for explaining the operation of the model included in the web application framework according to the present invention;

12 is a view for explaining the operation of the view included in the web application framework according to the present invention.

The present invention relates to a web server, and more particularly, to a framework for building a web application for e-business and a web server having the same.

Today, web-based Java applications for building e-business are becoming increasingly large and complex. In addition, changes in user needs and rapidly changing technologies require frequent changes of web applications.

However, the conventional web application development method has a problem that change management of the web application is very difficult because it is not systematic or standardized. Accordingly, the difficulty of developers and administrators for change management of web applications is increasing.

The most typical web application development method is to write a Java Server Page (JSP) that mixes a markup language that composes the screen to the client and a programming language such as Java. However, in the case of JSP, there is a problem due to the combination of massive Java code and HTML code and the mixing of JavaScript.

1 is a diagram illustrating a problem of a conventional web application, and FIG. 2 is a diagram illustrating a problem of a conventional web application framework. As illustrated in FIGS. 1 and 2, the conventional web application development method has a problem in that development and maintenance are difficult due to a mixture of presentation logic (JSP) using HTML and business logic using Java or JavaScript in source code. there was.

In addition, the web application development method described above has a problem that it is very difficult to reuse the developed component module due to a page independent design method, and it is difficult to control the organic flow between the independent pages. Furthermore, since the common modules are mounted and executed in independent pages, there is a structural defect that all pages should be corrected when a change or update request of the common module occurs.

As a result, when developing web applications, more time and staff should be devoted to presentation logic for constructing pages than business logic, which is a barrier to the development of advanced technicians, is difficult to maintain, and meets various needs of users. It causes a problem that is difficult to respond to.

As a solution to this problem, MVC (Model, View, Controller) architecture has been proposed that separates the design level from the program level, and has a centralized controller structure, and a new development that applies the MVC architecture to a web application. Environment is required.

It is an object of the present invention to provide a framework for building web applications that is easy to improve, maintain, and expand development productivity using MVC architecture.

Another object of the present invention is to provide a web server equipped with the above-described web application building framework.

According to the present invention, the above object is a framework for a web application, comprising: a first module for receiving an application request from a client and dividing the request into a request for presentation and a request for executing business logic; A second module that executes the corresponding business logic in response to a request for executing the business logic received from the first module; And a third module constituting a screen of a corresponding web page to be provided to a client according to a request for presentation received from the first module.

The first module includes: a servlet for receiving an application request from a client and delivering a processed application response to the client; And an event handler which delivers a request for executing business logic to a second module when an event occurs.

The second module preferably includes a business logic processor (Process) that obtains the requested data through an adapter for various storage media or an interface to a web service provider and delivers the requested data to the first module.

In addition, the third module preferably includes a Java server page (JSP) that configures a web page screen to include data obtained through the business logic processor.

Furthermore, the application framework may include at least one Action class that inherits the Action class prototype responsible for event handling, and / or at least one Process class that inherits the Process class prototype responsible for business logic. It is particularly desirable to register and manage at.

On the other hand, according to another field of the present invention, the above object is, in a web server for executing a web application, the application logic to distinguish the presentation logic and business logic, and to centrally process it, the application framework, A first module which receives an application request from a client and divides the request into a request for presentation and a request for executing business logic; A second module that executes the corresponding business logic in response to a request for executing the business logic received from the first module; And a third module constituting a screen of a corresponding web page to be provided to the client according to a request for presentation received from the first module.

In addition, the web server preferably further includes a development tool that receives a predetermined input from the developer to automatically generate each class based on the application framework,

It is preferable to further include a management tool that provides configuration, monitoring, or reporting functions for the application framework.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention;

3 is a view for explaining the features of the web application framework according to the present invention.

Referring to FIG. 3, the web application according to the present invention has a hierarchical structure, and includes a Java virtual machine and a WAS in the platform layer, and an application framework and a web application in the application layer. Specific e-business applications are created using an application framework 10 that provides an integrated environment common to each web application. An object of the present invention is to provide an application framework as an application integration environment for facilitating development and maintenance of web applications.

In particular, the application framework 10 according to the present invention provides structured classes divided into a model 12, a view 14, and a controller 16 according to the MVC architecture. Accordingly, the developer can easily implement the desired business logic using the structured classes provided in the application framework according to the present invention. For more information on the MVC architecture, see http://java.sun.com/blueprints/guidelines/designing_enterprise_applications_2e/index.html .

4 is an embodiment of a configuration of a web server equipped with a web application framework according to the present invention.

Referring to FIG. 4, the web server 1 according to the present invention includes an application framework 10 and an Enterprise Java Bean Tier (hereinafter, abbreviated as EJB Tier) 40. In addition, the web server 1 connects with the client 60 to receive an application request, and receives the desired data from the Enterprise Information Server (hereinafter, referred to as EIS Tier) 50 to the client and responds to the client. .

More specifically, looking at the structure of the application framework (or Web Tier) 10 according to the present invention, the controller 12 in charge of central processing, the model 14 for implementing business logic and the screen to be provided to the client It is provided with a view 16 to control the configuration of the. As described above, the application framework 10 according to the present invention is characterized by being implemented according to the MVC architecture according to the respective roles. That is, the role is clearly divided into the view 16 for presentation, the model 14 for business logic, and the controller 12 for central processing control thereof. In addition, the Proc class in charge of business logic can access the database through EJB object or directly through JDBC API without using EJB.

In contrast, conventional application development environments typically request JSPs or servlets that implement presentation logic directly whenever a client requests. However, the JSP is often coded directly including not only the presentation logic but also the SQL logic for accessing the business or the database, and thus, it is not possible to provide a structured integrated environment as in the present invention. . That is, as illustrated in FIG. 2, the application request from the client is directly transmitted to the JSP in charge of the presentation, which causes the above-described problem.

However, the application request from the client according to the present invention is not directly delivered to the JSP in charge of the presentation, but is delivered to and processed by the controller 12 in charge of the central processing control. By properly passing to the model 14 in charge of the view and the view 16 in charge of the presentation, the JSP only needs to handle the presentation function, which is a natural task. Thus, the development and maintenance of the application is convenient.

5 is another embodiment of the configuration of a web server equipped with a web application framework according to the present invention.

Referring to FIG. 5, the web server 1 according to the present invention not only provides the application framework described above with reference to FIG. 4, but also adds a management tool 3 and / or a development tool ( 2) can be provided.

More specifically, the application framework engine 10 includes a central processor (Servlet) 122 and an event handler (Action) 124 in charge of central processing, an output processor (JSP) 142 for presentation and Business logic processor (Proc) 142. The central processor 122 receives the application request from the user and transmits it to the event processor 124 and the output processor 162, and the event processor 124 transmits the event to the business logic processor 142 when the event occurs. The business logic processor 142 obtains the desired data through an interface such as an adapter for various storage media or an RPC SOAP for a web service provider. The obtained data is included in the page processed by the output processor 162 and delivered to the user.

In addition, the web server 1 according to the present invention may further provide a development tool 2 to help the developer to easily develop a web application. These development tools (2) include servlet class for central processing, Action class for events, Proc class for business logic, JSP class for editing page output format, adapter class for various storage media, interface class for database Includes a wizard function to automatically generate and more. That is, the prototype of each class is predefined in each class pool (also known as a resource pool), and the developer can select the desired class from each class pool to inherit them, add or modify the necessary data, and easily You can create classes for use in your work.

Furthermore, the web server 1 according to the present invention can provide a management tool 3 that can conveniently manage a web application. These management tools 3 include tools that provide functions for controlling the setting of the application framework engine 10, monitoring functions and / or report functions.

6 is a detailed configuration diagram of a web application framework according to the present invention.

Referring to FIG. 6, Action classes or Process classes that inherit the Action class prototype responsible for event processing or Process class prototype responsible for business logic are automatically added to a resource pool managed by the application framework 10. It is registered as and managed as a resource. As a result, quick access to resources created once is possible and execution performance can be improved. In addition, there is an advantage that it is easy to reuse the components created once.

7 is a detailed block diagram of a development tool for a web application according to the present invention.

Referring to FIG. 7, the development tool 2 includes a central processing generator 22, a business logic generator 24, an event generator 26, and an output editor 28.

Central processing generator 22 generates a central processing servlet with pre / post processing logic. Specifically, the central processing generator 22 generates a central processing source, mounts pre / post processing logic on the generated source to call an event, and automatically generates the central processing class through the output processing module after the event call.

The business logic generator 24 generates Java classes such as utility beans, entity beans, and session beans. The business logic generator 24 also preferably includes a tool for providing an adapter that manages the connection with the various media and generating a SOAP Client as an interface for providing the connection with the web service.

The event generator 26 generates an event class that manages the handling of Http requests and responses. Specifically, when the screen is designed by the developer and the request / response form is defined, an event class is automatically generated based on the screen design and the defined request / response form. The output editor 28 creates an output class using the tool, template output engine.

As shown in FIG. 7, the user simply inputs a desired content, and each class is automatically generated according to the application framework according to the present invention. As a result, the development and maintenance of the web application becomes easy.

8 is a detailed configuration diagram of a management tool for a web application according to the present invention.

Referring to FIG. 8, the management tool 3 is a tool 32 for managing the settings of the application framework engine. The management tool 3 manages settings of a business logic processor, an event processor, an output processor, a central processor, and the like. This includes tools for managing the database, tools for managing log output, tools for managing access rights to each processor, tools for managing connection information such as storage media, and tools for managing web services engines such as databases and hosts.

In addition, the management tool 3 includes a tool 34 for monitoring usage of each resource, such as a performance monitoring tool, a stress test tool, a shared resource usage monitoring tool, a user monitoring tool that is currently connected, a log output tool, and a web service. Engine status monitoring tools.

Furthermore, the management tool 3 includes a tool 36 for outputting a report, which includes a tool for outputting a report related to maintenance, such as a class relation chart, an event processing flowchart, and a frequency report of each class.

9 to 12 are diagrams for describing an operation of the application framework engine 10 according to the present invention.

First, FIG. 9 illustrates an operation of a resource pool included in a web application framework according to the present invention.

9, the Context Listener component included in the application framework engine 10 according to the present invention configures a resource pool by reading a configuration file when a web application is loaded. As described above, the resource pool includes an Action resource for handling an event, a Proc resource for handling business logic, a Code resource, a Message resource, and a UserDefine resource. Resource pools can run on a multi-threaded model to improve execution performance. The configured resource pool is available to each class through AegisContext.

10 is a view for explaining the operation of the controller included in the web application framework according to the present invention.

Referring to FIG. 10, a prototype class may be provided so that classes can be easily developed by reflecting only an additional function or a changed function in the classes that inherit the class. This allows source code to be standardized, facilitating development and maintenance of applications. In the example shown, you can inherit the ControllerServlet prototype to create a ControllerServlet class. When an application is requested through an action key such as Login or do or a controller servlet key, the ControllerServlet class performs preprocessing and requests the Action class with the requested information as a parameter. The Action class receives the request parameters, executes the process, and passes the execution result to the ControllerServlet through ActionResponse. ResponseHandler executes presentation logic such as JSP forward, redirect, or template engine. As such, the controller 12 controls the process of managing the event in response to the user's request, executing the requested process, and responding to the result.

11 is a view for explaining the operation of the model included in the web application framework according to the present invention.

Referring to FIG. 11, the model 14 in charge of processing business logic inherits the prototype Proc class to generate the Proc class. Proc class loads each Factory object which handles media connection from AegisContext and returns connection information for connection with storage media or database. The factory model allows you to handle media changes with minimal changes, ie factory changes, when the media changes. Accordingly, an interface using SOAP data of an adapter or a web service such as DAO or TAO can be easily generated.

12 is a view for explaining the operation of the view included in the web application framework according to the present invention.

Referring to FIG. 12, the view 16 in charge of the presentation logic processes the presentation logic using a custom tag in the JSP. In addition, the presentation logic may be processed using a template engine embedded in the application framework engine 10 such as Coven. Furthermore, in addition to the built-in handlers, the handlers may be registered for each application to implement the presentation logic.

The application framework 10 and the web server 1 having the same according to the present invention described above have the following features.

1) Clearly structure presentation logic and business logic.

2) Provide an application integration environment independent of platform or storage media.

3) By implementing adapters or interfaces as classes, they provide an open system structure even when extending the system.

4) By providing the wizard function among the development tools to automatically generate classes, even developers who do not know the structure of the application framework can easily participate in development.

5) By providing various management tools, the application framework can be easily set through the user interface. Various performance monitoring functions such as class usage and log status are provided.

6) The stress test function that can be used after the completion of development is provided.

The above description is only one embodiment of the present invention, and those skilled in the art may implement the present invention in a modified form without departing from the essential characteristics of the present invention. Therefore, the scope of the present invention should not be limited to the above-described examples, but should be construed to include various embodiments within the scope equivalent to those described in the claims.

As described above, according to the present invention, there is provided a web application building framework and a web server having the same, which are easy to improve, maintain, and expand development productivity and development using the MVC architecture.

That is, the reusability of components can be increased by utilizing the components of the formal structure provided by the application framework. In addition, the application framework provides the infrastructure so that developers can focus on business logic and simplify the structure of development source code. Furthermore, using a clearly differentiated infrastructure by function according to the MVC architecture facilitates extension and maintenance of the source code.

Claims (11)

In the framework for web applications, A first module receiving an application request from a client and classifying the application request into a request for presentation and a request for executing business logic; A second module configured to execute corresponding business logic in response to a request for executing business logic received from the first module; And And a third module constituting a screen of a corresponding web page to be provided to the client according to a request for presentation received from the first module. The method of claim 1, wherein the first module, A servlet for receiving an application request from the client and delivering a processed application response to the client; And And an event handler for delivering the request for executing the business logic to the second module when the corresponding event occurs. The method of claim 2, wherein the second module, And a business logic processor (Process) that obtains the requested data through an interface to an adapter or a web service provider for various storage media and delivers the requested data to the first module. The method of claim 3, wherein the third module, And a Java server page (JSP) for constructing a web page screen to include data obtained through the business logic processor. The method of claim 4, wherein the application framework, Register and manage at least one Action class that inherits the Action class prototype in charge of event handling, and / or at least one Process class that inherits the Process class prototype in charge of business logic in the Resource Pool. Application framework. In a web server running a web application, It distinguishes between presentation logic and business logic, and has an application framework that centralizes it. The application framework, A first module which receives an application request from a client and divides the request into a request for presentation and a request for executing business logic; A second module configured to execute corresponding business logic in response to a request for executing business logic received from the first module; And And a third module constituting a screen of a corresponding web page to be provided to the client according to a request for presentation received from the first module. The method of claim 6, And a development tool that receives predetermined input from a developer and automatically generates each class based on the application framework. The method of claim 6, And a management tool for providing a setting function, a monitoring function, or a report function for the application framework. The method of claim 6, wherein the first module, A servlet for receiving an application request from the client and delivering a processed application response to the client; And And an event handler which delivers a request for executing the business logic to the second module when a corresponding event occurs. The method of claim 9, wherein the second module, And a business logic processor (Process) that obtains the requested data through an adapter to various storage media or an interface to a web service provider and delivers the requested data to the first module. The method of claim 10, wherein the third module, And a Java server page (JSP) for constructing a web page screen to include data obtained through the business logic processor.

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