JP2014099778A - Mail communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speed up appropriate retrieval time in a mail server which requires cost when there are attached files such as image files in addition to a text in a mail and memory capacity for caching all the held mails is secured and whose retrieval processing becomes slow when the mail server stores the mails in a disk and a character string included in the mail text is retrieved in the large-scaled mail server.SOLUTION: A data storage server that can designate a storage destination of data to store the data is installed as a storage region of a mail box server. The mail box server analyzes a construction of the received mail, holds a mail header and a body, which become retrieval objects, in a memory, and holds an attached file which is not the retrieval object of a character string in a disk, in the data storage server.

Description

  The present invention relates to search processing for mail search from a subscribed user in a mail communication system.

  A conventional large-scale mail server system stores mail on a disk, which is advantageous from the viewpoints of cost, capacity, and reliability, when storing a user's electronic mail in a mailbox server.

  As background art of this technical field, there is JP-A-2002-359649 (Patent Document 1). In this publication, the e-mail server determines whether the e-mail is highly likely to be accessed by an electronic device such as a client PC in consideration of the user's characteristic access operation from the user's access history, It describes that an e-mail that is determined to have a high possibility of accessing a cache memory is stored.

JP 2002-359649 A

  In the case of a large-scale mail server, the mail has an attached file such as an image file in addition to the text. Since the attached file occupies most of the mail size, securing a memory capacity for caching all the stored mail is more expensive than storing it on a disk. On the other hand, when the mail server stores mail on a disk and searches for a character string included in the mail text for mail stored on the disk, disk access occurs, so the search process is slow.

  As described above, when the mail server searches for a character string included in the mail text, the processing time that occurs in disk access is shortened, and the search time is increased.

  As an example, the mail communication system according to the present invention receives a mail transfer server that transfers mail received from a communication terminal, a mail gateway that receives and relays the mail from the mail transfer server, and receives the mail from the mail gateway. A communication system having a mailbox server and a plurality of data store servers for storing at least a part of the mail, wherein the mailbox server is configured to send a mailbox for each user from the plurality of data store servers. A mailbox that designates the mail, divides the mail into a mail body and an attached file, and transmits the mail body and the information of the attached file to the data store server based on the mailbox information. 1 processor The store server includes a second processor that registers the mail text transmitted from the mailbox server and the information of the attached file in a mail information table.

  The data store server separates the attachments that are not necessary for the search, thereby limiting the character string search target and speeding up the character string search for the mail.

The block diagram of the system configuration | structure which shows embodiment of this invention Mailbox server logical configuration and table diagram Logical configuration and table diagram of data store server Sequence diagram of dividing and maintaining mail body and attached file of the present invention Attached file division flowchart

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

  FIG. 1 shows a block diagram of an embodiment of the present invention. In FIG. 1, 101 is a communication terminal capable of sending mail, 102 is a wireless network connecting 101 and 103, 103 is a carrier equipment network managed by a communication carrier, 102, 104, 106, 107, 108 and 109 are connected. Reference numeral 104 denotes the Internet, and reference numeral 105 denotes a mail transfer server connected to the carrier connection network or the like via 104. 106 is a mail gateway, 107 is a mailbox server, 108 is a data store server connected to 107 via 103, and 109 is a push gateway.

  FIG. 2 shows a logical configuration of the mailbox server. 2, 107 is the mailbox server shown in FIG. 1, 201 is a processor, 202 is an input / output circuit interface connected from the carrier equipment network, and 203 is a function for executing attachment file division shown in FIG. A mailbox server program, 204 is a volatile storage unit, 205 is a memory of the mailbox server, and 206 is a disk for storing user mail. Reference numeral 207 denotes a volatile storage unit 204, which is a data store server information table 207, which holds each of the data store server information 208, 209, and 210. Based on 207, the processor 201 determines a data store server to be connected for each user. The data store server information is provided corresponding to each of the plurality of data store servers, and includes information on users who store data.

  FIG. 3 shows the logical configuration of the data store server. 3, 108 is the data store server shown in FIG. 1, 301 is a processor, 302 is an input / output circuit interface connected from the carrier equipment network, 303 is a data store server program, 304 is a volatile storage unit, and 305 is data. A memory of the store server, 306 is a nonvolatile storage unit, and 307 is a disk of the data store server. Processing in the data store server is controlled by the processor 301.

  304 is a volatile storage unit, 310 is a mailbox information table, 308 is a mailbox information key in the mailbox information table, and 309 is mailbox information in the mailbox information table. The mailbox information key 308 is set in association with the user, and the mailbox to be accessed for each user is determined based on the corresponding mailbox information 309 stored in the table. Reference numeral 315 is a mailbox search table for each user, 311 is a management ID, 312 is quota information for holding the capacity limit of the mailbox, and 313 and 314 are mail IDs, which are unique keys of mail stored by the user. Reference numeral 318 denotes a mail information table, reference numeral 316 denotes a key (mail ID) associated with the mail ID 314, reference numeral 317 denotes a mail text obtained by dividing the attached file, and reference numeral 319 denotes attached file information stored in the nonvolatile storage unit 307. 318 is held for each user, and the mail text to be searched is held in the memory without holding the attached file in the memory. When a mail character search command is transmitted from the user communication terminal to the system, a character string search is executed on the mail body in the mail 317 area of the mail information table 318 by the processor 301 of the data store server. The

  Next, the attached file dividing process in the mailbox server will be described according to the sequence of FIG. The mail transfer server 105 transfers the mail 401 to the mail gateway 106, and the mail gateway returns a normal response 402 to the mail transfer server. The mail gateway relays the mail 403 to the mailbox server, and after receiving the mail 403, the mailbox server transmits a user mailbox information acquisition request 404 to the data store server. The data store server receives the mailbox information acquisition request 404 and returns the mailbox information 405 to the mailbox server.

  After receiving the response of the mailbox information 405, the mailbox server executes the attachment file division 406, and transmits the mail text and attached part analysis information 407 as the execution result to the data store server based on the mailbox information. Further, it instructs the data store server to update 408 of the mailbox search table 315 for each user. The attached part analysis information to be transmitted may be the attached file itself.

  The data store server updates 409 the mail, attached file analysis information, and mailbox information, and updates the mailbox information table 310, the mailbox search table 315 for each user, and the mail information table 318 shown in FIG. The data store server sends a success response 410 and the mailbox server sends a normal response 411 to the mail gateway. The mail gateway receives the normal response 411, transmits an incoming call notification request 412 to the push gateway, the push gateway receives the incoming call notification request 412, and notifies the communication terminal of the incoming call notification 413.

  Next, the attached file dividing process will be described with reference to the flowchart of FIG. In the attachment file division, in order to grasp the structure of the mail and to divide the attachment file, the mail structure is analyzed in 501 to determine whether the mail has a multi-part structure storing a plurality of different types of data. To do. The mail body to be searched later after the attached file is divided is composed of text data, and may include a mail header.

  In 502, mail header analysis is executed. Based on this, user information is generated to identify the user, and the user information in the data store server information 207, the key 308 in the mailbox information table 310, and the key 316 in the mail information table 318 are associated with each other.

  In the mail part type determination 503, the presence / absence of an attached file is determined. If the attached file exists, the attached file is extracted and the attached file information is calculated (504). For the attached file information, a unique key such as a hash value is calculated, and the attached file information 319 is updated.

  If it is determined in step 503 that the attached file does not exist, the attached file information for updating the attached file information 319 is updated to OFF (505). An email whose attachment file information is set to OFF represents an email with no attachment file.

  In 506, it is determined whether an unanalyzed part exists. If there is an unanalyzed part, the process returns to the process of 503, the process of 503 and below is executed, and the process is repeated until there is no unanalyzed part. When there are no unanalyzed parts, the attached file division process ends.

107 Mailbox Server 108 Data Store Server 203 Mailbox Server Program 316 Key (Mail ID)
317 Mail 319 Attached file information

Claims (5)

A mail forwarding server that forwards mail received from a communication terminal;
A mail gateway that receives and relays the mail from the mail transfer server;
A mailbox server for receiving the mail from the mail gateway;
A communication system having a plurality of data store servers storing at least a part of the mail,
The mailbox server is
For the e-mail, obtain mailbox information for designating a mailbox for each user from the plurality of data store servers, divide the e-mail into an e-mail body and an attached file, A first processor for transmitting to the data store server based on the mailbox information;
The data store server
A mail communication system, comprising: a second processor that registers the mail text transmitted from the mailbox server and the information of the attached file in a mail information table.   The mail communication system according to claim 1, wherein the mail body is composed of text data.   The said 2nd processor makes the said mail text registered into the said rule information table a search object, when the character search command of mail is transmitted from the said communication terminal. The described mail communication system.   4. The mail communication system according to claim 1, wherein the first processor extracts the attached file from the mail by analyzing the structure of the mail.   The first processor generates user information by header analysis of the mail, and the data corresponding to the user information based on data store server information in which correspondence relations between the user information and a plurality of data store servers are stored in advance. 5. The mail communication system according to claim 1, wherein the mailbox information is acquired from a store server.

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