KR20020065697A - Method of encoding for widl web frame work - Google Patents

Abstract

PURPOSE: A WIDL(Web Interface Definition Language) web frame work encoding method is provided to reduce a size of a client library for analyzing a session layer protocol between a WIDL processor and a web client program developed on a basis of the WIDL processor. CONSTITUTION: The method comprises steps of selecting a binding element, e(S302), checking if a currently selected element is the last(S303), checking if a type value of the currently selected element is a variable, namely a value of the binding element is a string(S305), in a case that the value of the binding element is a string, adding a number "0" and a separator before the binding element(S325) and adding a separator and a terminator after the binding element(S327, S329), in a case that the value of the binding element is one dimensional variable, adding a number "1" and a separator before the binding element(S331), adding a name of the binding element with a separator(S333), and then adding a size of the binding element with a separator(S335), in a case that the value of the binding element is two dimensional variable, adding a number "2" and a separator before the binding element(S311), adding a name of the binding element with a separator(S313), adding a size of the binding element with a separator(S315), selecting an "r" if one row of the binding element is "r"(S317) and stopping an encoding procedure if there exists no row to be selected(S319).

Description

Encoding method for WIDEL web framework {METHOD OF ENCODING FOR WIDL WEB FRAME WORK}

The present invention relates to a framework protocol (Plotocol) on the Web Interface Definition Language (Web), and more particularly, to a session between the Ydle processor and a web-based client program developed thereon. Session) Layer encoding method for the Wydle web framework that reduces the size of the client library for protocol interpretation.

In general, WiDL is a language that supports web-based program development by using declarative means to map web data to program variables and to define mappings between variables as services. In addition, the widle processor is a server-type software for executing a service request from a client program and maintaining a wile script. The widle and the widle processor automate a series of processes of referring to web data to perform a web-based task. It is used to develop web automation program that can simplify the process.

On the other hand, client programs developed on the basis of wires are often built on a client-server system that is separate from the wired processor, so that protocols for establishing and maintaining session contexts, expressing and executing service requests, and encoding / decoding data between them are available. Is required. In general, the required protocol is XML / RPC, and HTP is used to set and maintain the session context. In addition, XM (XML) is used for service request and data encoding and decoding, which is described as an embodiment as follows.

Example>

POST /RPC2HTTP/1.0

User-Agent: Frontier / 5.1.2 (WinNT)

Host: wire.bitweb.com

Content-Type: text / xml

Content-length: 181

<? xml version = "1.0"?>

<methodCall>

<methodName> sock.ticker </ methodName>

<params>

<param>

<name> tickerCode </ name> <value> <i4> 15760 </ i4> </ value>

</ param>

</ params>

</ methodCall>

The program above shows XML written in HTTP 1.0, which is an XML / RPC syntax for calling stock.ticker with an integer 15760 as an argument for the tickerCode. As illustrated, the identifier for "tickerCode" is used <name>, </ name>, and the integer "15760" contains <value> for start, <i4> and </ value> for end, </ i4 > Is used. In addition, the start identifier <params>, <param> and end identifier </ params>, </ param> are used to call the "stock.ticker", and the <methodName> and </ which indicate the start and end of the call character. methodName> is being used.

XML / RPC with such a framework will provide not only service request but also function to express structured data such as service execution result and exception occurrence, array or record. Also, HTTP and XML on which XML / RPC is based are designed as a general function for the web rather than a function for the wired framework. Therefore, only a socket interface is required to request a wired service mounted on a remote server. On the other hand, the HTTP is used as a general-purpose protocol for exchanging hypertext including text, virtual terminal, file transfer, e-mail, multimedia, and the like, and the data of the Wi-Fi service uses only strings, arrays, and tables. have.

However, since XML has an array or records nested to an arbitrary depth, freedom of expression is possible, and there is a problem that a protocol interpretation module becomes complicated due to excessive generality when using the HTTP and XML. In other words, when a web client is to be operated in a mobile device such as a PDA (PDA) or a mobile phone, it is very difficult to lighten the program and it is impossible to mount the program on the device itself. . For example, in the case of a mobile phone equipped with a Java virtual machine, the size of the program is limited to 15 KB or less, and an efficient lightweight protocol is required rather than a complicated heavyweight protocol more than necessary.

In addition, XML tags all elements of a binding, which causes a problem in that the encoded representation becomes excessively large compared to the original data, which causes a lot of burden for transmission over the Internet.

The present invention was created to solve the above problems, and the present invention does not use the tag structure of XM L, so that the protocol is light in weight, the data representation and execution time can be shortened, and the construction of the wire processor is easy. In addition, the present invention provides an encoding method for the YDL web framework that is not limited to the YW expression power.

According to an aspect of the present invention for achieving the above object, an encoding method for a web framework, comprising: a) outputting a starter factor (ⓑ) for starting a service according to a protocol command and a wireless service request; b) outputting the name of the protocol command or Wide service; c) outputting a terminator argument (ⓔ) for terminating a service and terminating encoding, or outputting a separator argument (ⓢ) for distinguishing a service according to whether the argument exists in the protocol command or the name of the WID service; And d) after outputting the separator factor ⓢ and outputting a string according to the binding argument, repeating the above process, or performing different binding encodings according to STRING, STRING [], STRING [] [] type classification. Characterized in that consisting of;

1 is a hardware block diagram for applying the present invention.

2 is a flowchart for encoding a protocol service request in accordance with the present invention.

3 is a flowchart for data binding encoding according to the present invention.

<Explanation of symbols for the main parts of the drawings>

101: central processing means 103: control means

105: input and output means 107: main storage means

109: secondary storage means

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing hardware for signal processing according to the present invention. 2 is an encoding flowchart for outputting a string when requesting a protocol and a service according to the present invention, and FIG. 3 is a flowchart for data binding encoding according to the present invention.

First, the hardware of the present invention according to FIG. 1 includes a central processing unit 101, a control unit 103, a main storage unit 107, an auxiliary storage unit 109, and an input / output unit 105. The main storage means 107 is equipped with a web automation program based on the Wydle framework, the central processing means 101 executes the program mounted on the main storage means 107, the secondary storage means 109 ) Stores intermediate files for temporary data generated during web automation program execution. In addition, the input / output means 105 inputs and outputs all data and error messages used or generated in the execution process of the web automation program, and the control means 103 controls the message transmission of the respective configuration means smoothly.

Here, the main storage means 107 refers to the main memory board of the system, the central processing means 101 is a central processing board is mounted on the web automation program mounted on the main memory board, the auxiliary storage means 109 is auxiliary It is a memory device that stores intermediate files that occur during the execution of web automation programs. It stores data that cannot be stored on the main memory board. That is, it stores only the information to be stored for a while. The input / output means 105 inputs / outputs all data and error messages used or generated in the process of executing the web automation program, and receives a protocol request or a wire service request.

FIG. 2 is a flowchart for encoding a protocol command and a service request, for defining a rule for encoding a protocol command or a service request constituting a session. All requests of the protocol according to the invention are encoded using a set of starter arguments (ⓑ), separator arguments (ⓢ) and terminator arguments (ⓔ). The set may consist of arbitrary characters that do not conflict with the name of the Widdle service or the web data.

Therefore, through the starter output step (S201) according to all requests of the protocol ⓑ start with a starter. After the output of the starter, a protocol command or service name is output (S203), and at this time, it is checked whether an argument is required according to the service request (S205). If no argument is required, the terminator factor ⓔ is output (S213), and the service request is terminated.

On the other hand, if an argument is required, a separator argument (ⓢ) is output (S207), and it is determined whether the argument is a string type or a wire binding type, that is, a protocol type. This determines the binding argument (S209). In the case of a string, the string itself is output together with the separator (S215), and in the case of the binding type, the binding encoding is output (S211). The binding encoding will be described in FIG. 3, and the above process is repeated for continuous string output.

3 is a flowchart for encoding a binding type argument. First, when the binding item is e and is selected (S301), it is determined whether the currently selected item is the last (S303). As a result of the determination, encoding is terminated if it is the last time, and if it is not the last time, it is determined whether the type value of the selected item is a variable value (S305). That is, it is determined whether the e value is STRING, and in the case of STRING, the separator factor ⓢ is added to the number "0" (S325). Here, the number "0" is for distinguishing the type value of e and is indicated as an embodiment of the present invention.

Thereafter, a separator factor ⓢ is added to the name of e (S327), and a separator factor ⓢ is added to the value of e (S329). For example, when "tickerCode" is STRING, it is as follows.

Yes)

0ⓢtickerCodeⓢⓔ

Here, the first head "0" is the dimension information of the value type of e, meaning STRING, ⓢ is a separator, and ⓔ is a terminator.

On the other hand, when the e-type value is not STRING and is a one-dimensional array, that is, STRING [] (S307), the dimension information becomes "1", and then a separator factor ⓢ is added (S331). Like the STRING, a separator factor ⓢ is added together with the name of e (S333), and a separator factor ⓢ is added to the size of e value (S335). If the STRING [] continues, the above process is repeated, and if it is determined that the last item, the encoding is terminated.

If the type value of e is a two-dimensional array, that is, STRING [] [] (S309), the dimension information becomes "2", and the separator factor ⓢ is added as described above (S311). A separator factor ⓢ is added to the name of e (S313), and a serapattern factor ⓢ is added to the size of e (S315). If one row of e according to the secondary array is r, the r is selected (S317). If there are no more rows after r is selected, encoding is terminated (S319). If r is not the last row, a separator factor ⓢ is added to the size of r, that is, the number of elements. The encoding is applied to all columns of r according to the STRING rule, and the above process is repeated for the remaining rows except for r.

For example, if you request the stock.ticker service,

You can form a protocol like "ⓑ1ⓢstock.tickerⓢ1ⓢ0ⓢtickerCodeⓢ15760ⓢⓔ".

As described above, according to the present invention, the protocol interpreter can be simplified by relying only on TCP sockets over HTTP for the transport layer and using simple encoding over XML. Therefore, it is possible to increase the transmission efficiency by reducing the size of transmitted data due to simple encoding and decoding, and to minimize the client library and to use it as a protocol of a mobile phone or a portable office device and a mobile device.

What has been described above is only one embodiment for implementing an encoding method for the Wyed web framework according to the present invention, and the present invention is not limited to the above-described embodiment, and is claimed in the following claims. As described above, any person having ordinary knowledge in the field of the present invention without departing from the gist of the present invention will have the technical spirit of the present invention to the extent that various modifications can be made.

Claims (3)

a) outputting a starter factor (ⓑ) for starting the service according to the protocol command and the Wydel service request; b) outputting the name of the protocol command or Wide service; c) outputting a terminator argument (ⓔ) for terminating a service and terminating encoding, or outputting a separator argument (ⓢ) for distinguishing a service according to whether the argument exists in the protocol command or the name of the WID service; And d) After outputting the separator argument ⓢ and outputting a string according to the binding argument, repeating the above process, or a variable, one-dimensional array, or two-dimensional array, STRING [] [] And performing different binding encodings according to the type classification. The method of claim 1, wherein the binding encoding method is a) selecting a binding item; b) determine the type value of the selected binding item, and if the type value of the binding item is STRING, output the first type classification factor and the separator factor ⓢ and output the name and the separator factor ⓢ of the binding item. Outputting, sequentially outputting a value of the binding item and a separator factor (ⓢ); d) when the binding value of the binding item is a one-dimensional array (STRING []), outputs a type 2 classification factor and a separator factor (ⓢ), outputs a name and a separator factor (ⓢ) of the binding item, and Sequentially outputting the size of the binding item and the separator factor ⓢ; And e) if the binding value of the binding item is a two-dimensional array (STRING [] []), the third type classification factor and the separator factor ⓢ are output, and the name and the separator factor ⓢ of the binding item are output. Outputs the size of the binding item and the separator factor (ⓢ), selects a row according to a two-dimensional array (STRING [] []), outputs the size of the selected row and the separator factor (ⓢ), and outputs the row Performing encoding according to the above process for all columns corresponding to the above, repeating the process by selecting the remaining rows except the row, and ending the encoding when the current row selection is the last; Encoding method for the Wydle web framework. 3. The method of claim 2, wherein the first classifier, the second classifier, and the third classifier are arbitrary numbers that do not conflict with names of web services or web data. Encoding Method.