Client device, data communication system, data communication method, and program

A data communication method comprising:

• determining by a compression necessity determiner
• a necessity of compression of to-be-uploaded data to be uploaded to a server, and
• a necessity of compression of to-be-downloaded data to be downloaded from the server in response to a download request when content of the to-be-uploaded data indicates the download request to the server;
• compressing by a data compressor the to-be-uploaded data in a predetermined scheme when the compression of the to-be-uploaded data is determined to be necessary by the compression necessity determiner;
• acquiring by a data acquirer, from an communication interface configured to communicate with the server, data transmitted from the server;
• determining by a decompression necessity determiner a necessity of decompression of downloading data when the data transmitted from the server contains the downloading data;
• decompressing by a data decompressor the downloading data in a predetermined scheme when the decompression of the downloading data is determined to be necessary by the decompression necessity determiner;
• sending by a data sender to the communication interface configured
• when the compression of the to-be-uploaded data is determined to be unnecessary by the compression necessity determiner, data in which a header is added to the to-be-uploaded data, and
• when the compression of the to-be-uploaded data is determined to be necessary by the compression necessity determiner, data in which a header is added to the to-be-uploaded data that is compressed by the data compressor, the header containing information indicating that the to-be-uploaded data is compressed data;
• and
• storing by the data sender, in the header, information requesting compression of data when the compression of the to-be-downloaded data is determined to be necessary by the compression necessity determiner,
• wherein the necessity of compression of the to-be-downloaded data is determined by the compression necessity determiner based on a size of the to-be-downloaded data and a second time table in which a data size, a total processing time obtained by adding a processing time by the data decompressor to a processing time by the data acquirer when the downloading data is decompressed, a processing time by the data acquirer when the downloading data is not decompressed are associated with one another.

A non-transitory computer-readable recording medium recording a program for causing a computer to function as:

• a compression necessity determiner configured
• to determine a necessity of compression of to-be-uploaded data to be uploaded to a server, and
• to determine a necessity of compression of to-be-downloaded data to be downloaded from the server in response to a download request when content of the to-be-uploaded data indicates the download request to the server;
• a data compressor configured to compress the to-be-uploaded data in a predetermined scheme when the compression necessity determiner determines that the compression of the to-be-uploaded data is necessary;
• a data acquirer configured to acquire, from an communication interface configured to communicate with the server, data transmitted from the server;
• a decompression necessity determiner configured to determine a necessity of decompression of downloading data when the data transmitted from the server contains the downloading data;
• a data decompressor configured to decompress the downloading data in a predetermined scheme when the decompression necessity determiner determines that the decompression of the downloading data is necessary;
• and
• a data sender configured
• to send, when the compression necessity determiner determines that the compression of the to-be-uploaded data is unnecessary, to the communication interface, data in which a header is added to the to-be-uploaded data,
• to send, when the compression necessity determiner determines that the compression of the to-be-uploaded data is necessary, to the communication interface data in which a header is added to the to-be-uploaded data compressed by the data compressor, the header containing information indicating that the to-be-uploaded data is compressed data, and
• to store, in the header, information requesting compression of data when the compression necessity determiner determines that the compression of the to-be-downloaded data is necessary,
• wherein the compression necessity determiner is configured to determine the necessity of compression of the to-be-downloaded data based on a size of the to-be-downloaded data and a second time table in which a data size, a total processing time obtained by adding a processing time by the data decompressor to a processing time by the data acquirer when the downloading data is decompressed, and a processing time by the data acquirer when the downloading data is not decompressed are associated with one another.