JP2008203959A - Serialization method in data transfer, data format and data transfer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a communication data size, and to shorten a communication time in the serialization time of a data object in a data transfer device. <P>SOLUTION: At a transmission side device 1, when data objects are serialized, all data are not serially arranged but arranged while any data which should not be necessarily sent are saved, so that communication data can be prepared. At a reception side device 5, it is possible to correctly structure the received communication data by adding saving flag bits showing the presence/absence of this saving. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a serialization method, a data format, and a data transfer apparatus in a case where a data object that is an aggregate of data is serialized and data is transferred.

  In general, in a data transfer device, a data object that is a collection of data (for example, stored in a storage unit in a data format that can be processed by software) is serialized (processing that converts the data format into a data format that can be transmitted and received via a communication path) Then, the communication data is transmitted from the transmission side device to the reception side device via the communication path, and the reception side device has a structure (deserialization: processing for converting the communication data into a data format that can be processed by software) and the data object. To restore. In such a data transfer device, it is required to shorten the communication time.

  Therefore, Patent Document 1 below discloses a data transfer method that improves the data transfer response between the client terminal and the server by compressing the serialized communication data.

In Japanese Patent Laid-Open No. 2006-126981, the communication data size is reduced by reducing the redundancy of information included in serialized communication data. Therefore, the communication data size cannot be made smaller than the amount of information included in the communication data.

  Therefore, the present invention reduces the amount of information included in communication data by omitting serialization of the data itself that has been instructed to be omitted based on omission availability information for each data to be serialized during data transfer. Thus, an object of the present invention is to provide a serialization method, a data format, and a data transfer device in data transfer that can reduce the communication data size and shorten the communication time.

  Other objects and novel features of the present invention will be clarified in embodiments described later.

  In order to achieve the above object, the serialization method according to an aspect of the present invention omits each data to be serialized based on omission availability information when transferring data of a data object that is an aggregate of data. Is characterized by omitting data instructed to serialize.

  According to the serialization method of this aspect, it is possible to reduce the communication data size by omitting serialization of the data itself instructed to be omitted and reducing the amount of information included in the communication data, thereby reducing the communication time. Can be achieved.

  A data format according to another aspect of the present invention is characterized in that, when serializing a data object that is a collection of data, whether or not each data is omitted is identified by an omitted flag bit.

  According to the data format of this aspect, each data is transferred on the receiving side by adding, as the abbreviated flag bit (for example, 1 bit), whether the data to be serialized at the time of data transfer is omitted or not. It is possible to determine whether it has been done or omitted.

  In the data format of another aspect of the present invention, when serializing a data object that is a collection of data, each data is divided into units of N (N: an integer of 2 or more), and N pieces are prefixed to each piece. An omission flag block, which is a set of omission flag bits for the data, is added.

A data transfer device according to another aspect of the present invention is created by a transmission-side storage unit that stores data objects that are aggregates of data, a serialization unit that serializes data objects in the transmission-side storage unit, and the serialization unit A transmission side device having a data transmission unit for transmitting the communication data,
A data receiving unit that receives communication data transmitted from the data transmitting unit via a communication path, a structure unit that structures communication data received by the data receiving unit, and a data object that is structured by the structure unit. A receiving side device having a receiving side storage unit for storing,
The serialization unit receives a total data list and omissibility information for each data from the transmission side storage unit, omits data instructed to be omitted based on the omission availability information, and serializes,
The structure unit receives the same total data list as the total data list of the transmission-side storage unit from the reception-side storage unit, and outputs each data structured in association with the data items of the total data list to the reception-side storage unit It is characterized by doing.

  According to the present invention, the communication data size can be reduced, and the communication time can be shortened.

  In serialization, for example, N data is used as one unit and an abbreviated flag block is added to the head of the data. Therefore, even if the transfer of communication data is not completely completed, the receiving side performs structure processing as needed from the part where reception has been completed. be able to.

  Hereinafter, as a best mode for carrying out the present invention, embodiments of a serialization method, a data format, and a data transfer device in data transfer will be described with reference to the drawings.

  FIG. 1 shows an overall configuration of a data transfer apparatus according to an embodiment of the present invention, and FIG. 2 shows an example of a data format of a serialization method in that case.

  The data transfer device includes a transmission-side device 1 and a reception-side device 5, and the data transmission unit 4 of the transmission-side device 1 and the data reception unit 8 of the reception-side device 5 have a communication path (network) that allows digital communication. Connected through. In communication between the data transmission unit 4 and the data reception unit 8, it is assumed that an error does not occur in communication contents using a reliable protocol such as TCP / IP.

  The transmission side apparatus 1 transmits / receives each data of the data object of the transmission side memory | storage part 2 which memorize | stored the data object which is an aggregate | assembly of data in the data format which can be processed with a software, and a transmission path It has a serialization unit 3 that serializes into a possible data format, and a data transmission unit 4 that transmits communication data created by the serialization unit 3.

  Here, from the transmission side storage unit 2, a total data list 11 in which all data items to be serialized in the data object are listed and each data 12 to be actually serialized (corresponding to each data item in the total data list). And the omissibility information 13 for the total data list 11 is output to the serialization unit 3 and the serialization unit 3 is requested to transmit. The serialization unit 3 arranges the data 12 in series according to the data format of FIG. The serialization unit 3 sends the serialized result to the data transmission unit 4 as communication data 14.

  FIG. 2 shows a data format of the serialization method according to the embodiment of the present invention. In this data format, each data is divided into 8 units at the time of serialization in the serialization unit 3, and an abbreviated flag block of 1 byte (8 bits) is used as an abbreviated flag bit for the 8 data at the beginning of each segment. Append. That is, the transmission-side storage unit 2 in FIG. 1 sends the total data list 11 and the omissibility information 13 to the serialization unit 3 and adds designation of whether or not to serialize each data 12. When data serialization is omitted, the corresponding 1-bit omission flag bit is set to 1, and when data serialization is not omitted, data is arranged in series and the corresponding omission flag bit is set to 0. It is assumed that the method for setting the omission flag bit follows the flowchart of FIG. In the step of “adding an omission flag block at the end of the communication data string” in the flowchart of FIG. N is a natural number and indicates the number of data in a communication data string composed of eight data.

  The receiving-side apparatus 5 communicates by structure (deserializing) the communication data 15 received by the data receiving unit 8 and the data receiving unit 8 that receives the communication data transmitted from the data transmitting unit 4 via the communication path. It has a structure unit 7 for processing the data 15 into a data format that can be processed by software, and a receiving-side storage unit 6 for storing the data objects that are structured (reconstructed) by the structure unit 7.

  The receiving side storage unit 6 sends the total data list 16 (the same data as the total data list 11 is shared on the receiving side) to the structure unit 7 and requests the structure unit 7 for structure processing. The structure unit 7 reads the received communication data 15 from the head, and if the corresponding omission flag bit is 1, the structure of the data is not performed (the data with the omission flag bit of 1 is omitted on the transmission side. If the corresponding omission flag bit is 0, the data is structured, the data 17 is structured in association with the data items of the total data list 16, and the data which can be processed by the receiving side storage unit 6 by software. Store as a formatted data object. The determination method of the omission flag bit follows the flowchart of FIG. However, M in FIG. 4 is a natural number and indicates the number of the total data. N is a natural number and indicates the number of data in a communication data string composed of eight data.

  FIG. 5 shows a specific example in the case of serializing a data object having 10 pieces of data. In the case where it is possible to omit D3, D4, D5, and D9 among the ten pieces of data from D1 to D10, communication data that does not include the data of D3, D4, D5, and D9 is generated as shown in FIG. That is, during serialization, D3, D4, and D5 are omitted from the data D1 to D8 divided in units of eight, and serialization processing is performed. However, in the omission flag block, whether or not omission is performed for the eight data is indicated by a 1-bit omission flag bit.

  FIG. 6 shows a specific example of the total data list of data objects having 10 data items D1 to D10 as shown in FIG. The total data list is a list of data items D1 to D10 in order. By sharing the same total data list between the sending device and the receiving device, the receiving device recognizes which data item corresponds to the omitted data, and the structured data corresponds to which data item. Can be recognized. That is, a data object having data D1, D2, D6, D7, D8, and D10 that needs to be transferred is generated and stored in the receiving-side storage unit.

  According to this embodiment, the following effects can be obtained.

(1) When a data object is serialized by the serialization unit 3 of the transmission side device 1, not all the data included in the data object is serially arranged to create a communication data string, and data that is not necessarily sent is omitted. Are lined up. By using communication data with an omission flag block having omission flag bits indicating the presence or absence of omission for each data, the receiving-side apparatus 5 can structure communication data correctly.

(2) As a result, in the data transfer device composed of the transmission side device 1 and the reception side device 5, it is possible to reduce the communication data size at the time of serialization of the data object and shorten the communication time.

(3) The serialization in the transmission side device 1 is performed by adding an abbreviated flag block to the head of N (8 in this example) data as one unit, so even if the transfer of all communication data is not completed, In the receiving side device 5, the structure processing can be performed at any time by the structure unit 7 from the part where the reception is completed.

  Although the embodiments of the present invention have been described above, it will be obvious to those skilled in the art that the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the claims.

1 is a system configuration diagram of a data transfer apparatus according to an embodiment of the present invention. It is explanatory drawing of the data format of the serialization method in embodiment of this invention. It is a flowchart of the serialization method. It is a flow chart of structure processing in an embodiment. It is explanatory drawing of the specific example at the time of serializing with the serialization method which concerns on this Embodiment with respect to the data object which has 10 data. It is explanatory drawing which shows the specific example of a total data list.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transmission side apparatus 2 Transmission side memory | storage part 3 Serialization part 4 Data transmission part 5 Reception side apparatus 6 Reception side memory | storage part 7 Structure part 8 Data reception part 11, 16 Total data list 12, 17 Each data 13 Omissibility information 14, 15 Communication data

Claims (4)

  Data transfer characterized by omitting data that is instructed to be omitted based on omissibility information for each data to be serialized during data transfer of a data object that is an aggregate of data Serialization method.   A data format characterized in that, when serializing a data object that is a collection of data, the presence or absence of omission of each data is identified by an omission flag bit.   When serializing a data object that is a collection of data, each data is divided into N (N: an integer of 2 or more) units, and an abbreviation that is a set of abbreviated flag bits for N data at the beginning of each division. A data format characterized by adding a flag block. A transmission-side storage unit that stores data objects that are aggregates of data, a serialization unit that serializes data objects in the transmission-side storage unit, and a data transmission unit that transmits communication data created by the serialization unit A transmitting device;
A data receiving unit that receives communication data transmitted from the data transmitting unit via a communication path, a structure unit that structures communication data received by the data receiving unit, and a data object that is structured by the structure unit. A receiving side device having a receiving side storage unit for storing,
The serialization unit receives a total data list and omissibility information for each data from the transmission side storage unit, omits data instructed to be omitted based on the omission availability information, and serializes,
The structure unit receives the same total data list as the total data list of the transmission-side storage unit from the reception-side storage unit, and outputs each data structured in association with the data items of the total data list to the reception-side storage unit A data transfer device.

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