JP4622832B2 - Cache management system, cache management method, cache management program, and cache management server - Google Patents

Description

  The present invention relates to a cache management system, a cache management method, a cache management program, and a cache management server that convert data attached to an electronic mail to be transmitted to a mobile terminal and transmit the data to each mobile terminal.

  When an e-mail is sent to a mobile terminal for display, the mobile terminal uses the mobile terminal's CPU and resource restrictions and display application software for attached data other than the text body of the e-mail and some image data. Depending on the presence or absence, it may not be possible to display as it is.

  In such a case, for example, as described in Patent Document 1, an e-mail server or the like converts attached data into a format that can be displayed on the mobile terminal, and the mobile terminal receives the converted data. Display method is used.

  Also, by holding the conversion result of the attached data as a cache on the e-mail server for a certain period of time, if the same attached data is requested again from the mobile terminal, re-conversion is not performed, and the server load for data conversion A method of reducing this is also used.

  Patent Document 2 describes a message storage method using a mailbox manager that manages an area for storing received electronic mail.

Japanese Unexamined Patent Publication No. 2000-112840 (paragraphs 0019-0025, FIG. 1) JP-A-4-222139 (paragraphs 0009 to 0018, FIG. 1)

  The same electronic mail may be transmitted to a plurality of users (mobile terminals) simultaneously (hereinafter, the same electronic mail transmitted to a plurality of transmission destinations will be referred to as a broadcast mail). In such a case, since the conventional method as described in Patent Document 1 performs data conversion for each user, the conversion of the same attached data is repeated by the number of broadcast users. There is a problem that the server load for becomes heavy.

  In addition, when a user requests conversion to the email server in order to view the attachment data of a broadcast mail received by another user, another user who received the same broadcast mail before that sent the conversion of the attachment data electronically. There may be a request to the mail server. In such a case, there is a problem that a waiting time for converting attached data occurs even if the conversion result is already cached (stored) in the server.

  In addition, since the electronic mail server holds the converted cache data (that is, the conversion result) by the number of users, there is a problem that the storage area of the server is compressed.

  In addition, since the method described in Patent Document 2 manages the body of the broadcast mail in one, when all recipients of the broadcast mail do not delete the broadcast mail from the server, There is a problem that the body cannot be deleted from the server.

  Therefore, the present invention reduces the load on the server when converting data attached to an e-mail to be transmitted to a plurality of mobile terminals and transmitting the data to each mobile terminal and reducing the conversion waiting time. An object of the present invention is to provide a cache management system, a cache management method, a cache management program, and a cache management server.

A cache management system according to the present invention is a cache management system for converting attached data of a received e-mail and transmitting it to a mobile terminal, a mail storage means for holding the received e-mail, and an e-mail from the mobile terminal. A cache management unit that receives a request for conversion of attached data, a data conversion unit that converts email attachment data held by the mail storage unit into a format that can be displayed by the mobile terminal, and a conversion result of the data conversion unit Cache storage means for storing, when the cache management means receives a conversion request for attached data from the mobile terminal , the cache management means transmits the conversion result stored in the cache storage means to the mobile terminal , When receiving an e-mail, an identifier identifying the attached data is added to the e-mail, and the attached data When a conversion request is received, the identifier is referred to determine whether or not the cache storage means stores the conversion result of the attached data requested to be converted, and the data conversion means attaches the conversion request for the conversion. If it is determined that the data conversion result is not stored in the cache storage means, the attached data is converted into a format that can be displayed by the mobile terminal, and the cache management means caches the conversion result of the attached data requested to be converted. When the storage means does not store, the conversion result of the data conversion means is stored in the cache storage means, the conversion result is transmitted to the portable terminal, and the conversion result of the attached data requested to be converted is stored in the cache storage means. The conversion result stored in the cache storage means is transmitted to the portable terminal without converting the attached data, and the cache management means manages the identifier. By inserting a part header of email Chipato form, characterized by adding an identifier to the electronic mail.

A cache management system according to another aspect of the present invention is a cache management system for converting attached data of a received electronic mail and transmitting it to a mobile terminal, a mail storage means for holding the received electronic mail, and a mobile terminal A cache management means for receiving a conversion request for the attached data of the e-mail, a data conversion means for converting the attached data of the e-mail held by the mail storage means into a format that can be displayed by the mobile terminal, Cache storage means for accumulating the conversion results of the cache, and when the cache management means receives a conversion request for attached data from the mobile terminal, the cache storage means transmits the conversion results stored in the cache storage means to the mobile terminal, When receiving the email, the management means adds an identifier for identifying the attached data to the email and adds it from the mobile terminal. When a data conversion request is received, the identifier is referred to determine whether or not the cache storage means stores the conversion result of the attached data requested to be converted. The data conversion means is requested to convert When it is determined that the cache storage means does not store the attached data conversion result, the attached data is converted into a format that can be displayed by the mobile terminal, and the cache management means converts the attachment data requested to be converted. Is stored in the cache storage means, the conversion result of the data conversion means is stored in the cache storage means, the conversion result is transmitted to the portable terminal, and the conversion result of the attached data requested for conversion is stored in the cache storage means. If you are accumulated, transmits the conversion result cache storage unit is accumulated without conversion of the attached data to the portable terminal, the cache management means, By inserting a mail header of the e-mail Besshi, characterized by adding an identifier to the electronic mail.

  The cache management unit may cause the data conversion unit to convert the attached data in advance and store the conversion result in the cache storage unit when the number of e-mail transmission destinations is equal to or greater than a predetermined reference value. .

  The cache management unit may erase the conversion result for which conversion is not requested for a predetermined time or longer from the cache storage unit.

A cache management method according to the present invention is a cache management method for converting attached data of a received e-mail and transmitting it to a mobile terminal. When receiving an e-mail, the attached data is used as a part header of a multi-part e-mail. When the identifier is added to the e-mail by inserting the identifier for identification, and the attachment data conversion request is received from the portable terminal, the conversion result of the attachment data requested to be converted is stored with reference to the identifier. If the conversion result has been accumulated, the attached data is not converted and the conversion result is sent to the mobile terminal. If the conversion result has not been accumulated, it has been received. converts e-mail attachments data mail storage means holds for holding the e-mail into a format displayable by the portable terminal, the identifier together with the result of the conversion Accumulated, and transmits the converted result to the mobile terminal.

According to another aspect of the present invention, there is provided a cache management method for converting attached data of a received electronic mail and transmitting it to a mobile terminal, wherein the identifier identifies the attached data as a mail header when the electronic mail is received. Whether or not the conversion result of the attached data requested to be converted is stored with reference to the identifier when the attached data conversion request is received from the portable terminal by adding the identifier to the e-mail. If the conversion result is accumulated, the attached data is not converted and the conversion result is transmitted to the mobile terminal. If the conversion result is not accumulated, the received e-mail is It converts e-mail attachments data holding mail storage means has in a format that can be displayed on a mobile terminal, stores the conversion result together with the identifier, the conversion result And transmits the band terminal.

  When the number of e-mail transmission destinations is equal to or larger than a predetermined reference value, the attached data may be converted in advance and the conversion result may be accumulated.

  You may delete the conversion result for which conversion was not requested | required more than predetermined time.

Cache management program according to the present invention is a cache management program installed in the cache management system to the mobile terminal converts the attached data of the received electronic mail, the computer, when the electronic mail reception, multi-part form Inserting an identifier that identifies the attached data as the part header of the e-mail and adding the identifier to the e-mail, and when receiving a conversion request for the attached data from the mobile terminal, conversion is performed by referring to the identifier For determining whether or not the conversion result of the attached data requested is stored, and if the conversion result is stored in the storage means, the conversion result is not converted without the conversion of the attached data. Attached data can be displayed on the mobile device when the process of sending to the device and the conversion result are not stored in the storage means Into a format, stored in the storing means the conversion results together with an identifier, and wherein the to execute a process of transmitting the converted results to the mobile terminal.

A cache management program according to another aspect of the present invention is a cache management program installed in a cache management system that converts attached data of a received electronic mail and transmits the converted data to a mobile terminal. When an identifier for identifying attached data is inserted as a mail header, and processing for adding an identifier to an e-mail and a conversion request for attached data from a mobile terminal are received, conversion is requested with reference to the identifier. If the conversion result of the attached data is stored and the conversion result is stored in the storage means, the conversion result is transmitted to the portable terminal without converting the attached data. If the processing and conversion results are not stored in the storage means, convert the attached data into a format that can be displayed on the mobile device Results were accumulated in the storage means together with an identifier, and wherein the Rukoto to execute a process of transmitting the converted results to the mobile terminal.

  When the number of e-mail transmission destinations is equal to or greater than a predetermined reference value, the computer may perform processing for previously converting the attached data and storing the conversion result.

  You may make a computer perform the process which erase | eliminates the conversion result which conversion was not requested | required more than predetermined time.

A cache management server according to the present invention is a cache management server that converts attached data of a received electronic mail and transmits the converted data to a mobile terminal, a mail storage unit that holds the received electronic mail, and an electronic mail from the mobile terminal. A cache management unit that receives a request for conversion of attached data, a data conversion unit that converts email attachment data held by the mail storage unit into a format that can be displayed by the mobile terminal, and a conversion result of the data conversion unit Cache storage means for storing, when the cache management means receives a conversion request for attached data from the mobile terminal , the cache management means transmits the conversion result stored in the cache storage means to the mobile terminal , When an email is received, an identifier for identifying the attached data is added to the email, and the attached data is converted from the mobile terminal. When the request is received, the identifier is referred to determine whether or not the cache storage means stores the conversion result of the attached data requested to be converted, and the data converting means transmits the attached data requested to be converted. When it is determined that the cache storage means does not accumulate the conversion result of the above, the attached data is converted into a format that can be displayed by the mobile terminal, and the cache management means caches the conversion result of the attached data requested to be converted. When the means is not stored, the conversion result of the data conversion means is stored in the cache storage means, the conversion result is transmitted to the portable terminal, and the conversion result of the attached data requested to be converted is stored in the cache storage means. The attached data is not converted, the conversion result stored in the cache storage means is transmitted to the mobile terminal, and the cache management means By inserting a part header of email over preparative form, it characterized by adding an identifier to the electronic mail.
According to another aspect of the present invention, a cache management server is a cache management server that converts attached data of a received e-mail and transmits the converted data to a portable terminal, a mail storage unit that holds the received e-mail, A cache management unit that receives a conversion request for email attachment data from a terminal, a data conversion unit that converts email attachment data held by the email storage unit into a format that can be displayed by the mobile terminal, and data Cache storage means for storing the conversion result of the conversion means, and the cache management means transmits the conversion result stored in the cache storage means to the portable terminal when receiving a conversion request for attached data from the portable terminal. The cache management means adds an identifier for identifying the attached data to the e-mail when the e-mail is received. When the attached data conversion request is received, the identifier is referred to determine whether or not the cache storage means stores the conversion result of the attached data requested to be converted. The data conversion means requests the conversion. When it is determined that the cache storage means does not store the conversion result of the attached data, the attached data is converted into a format that can be displayed by the mobile terminal, and the cache management means converts the attachment data requested to be converted. When the cache storage means does not store the result, the conversion result of the data conversion means is stored in the cache storage means, the conversion result is transmitted to the portable terminal, and the conversion result of the attached data requested for conversion is cache storage means Is stored, the conversion result stored in the cache storage means is transmitted to the portable terminal without converting the attached data, and the cache management means By inserting an identifier as a mail header of electronic mail, characterized by adding an identifier to the electronic mail.

  According to the present invention, since the cache storage means stores the conversion result of the attached data, the server load due to the data conversion of the attached data of the broadcast mail can be reduced.

  Further, according to the present invention, it is possible to reduce the conversion waiting time for data conversion of data attached to a broadcast mail.

  Furthermore, according to the present invention, it is possible to reduce the storage area for the cache data for storing the conversion result of the attached data of the broadcast mail.

  In addition, when the conversion result is not accumulated, the server load due to the data conversion of the attached data can be reduced when the attached data is converted.

  When the number of e-mail destinations is equal to or greater than a predetermined reference value, the conversion of attached data is performed in advance and the conversion result is stored. You can set the operation according to the mail destination.

  When the conversion result that has not been requested for conversion for a predetermined time or longer is erased, the storage area for storing the conversion result of the attached data can be reduced.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of an embodiment of a cache management system according to the present invention.

  The embodiment of the present invention includes a data processing device (cache management system, cache management server) 100 that operates by program control, and a portable terminal 105.

  The data processing apparatus 100 includes a mail storage unit 101, a cache management unit 102, a data conversion unit 103, and a cache storage unit 104.

  The mail storage unit 101 stores (holds) the e-mail 101a received by the data processing apparatus 100.

  The cache management unit 102 adds an identifier for uniquely identifying an e-mail to the e-mail 101a stored in the mail storage unit 101.

  In response to a request from the portable terminal 105, the cache management unit 102 stores the conversion result 104a of the attached data attached to the e-mail 101a stored in the mail storage unit 101 in the cache storage unit 104 ( It is determined whether or not it is stored. If the cache storage unit 104 does not store the conversion result 104 a, the cache management unit 102 extracts the attached data from the mail storage unit 101 and passes it to the data conversion unit 103.

  The data conversion unit 103 converts the attached data attached to the e-mail 101 a held by the mail storage unit 101 into a format that can be displayed by the mobile terminal 105.

  The cache storage unit 104 stores the conversion result 104a obtained by converting the attached data by the data conversion unit 103 together with the identifier added by the cache management unit 102 to the e-mail 101a.

  The data processing apparatus 100 is installed in, for example, an Internet provider or a mobile phone service provider. When the data processing apparatus 100 is installed in an Internet provider, the mobile terminal 105 connects to the data processing apparatus 100 via the Internet and reads the e-mail 101a and attached data.

  The data processing apparatus 100 is realized by a computer that executes processing according to program control, for example.

  The data processing apparatus 100 is a cache management program installed in a cache management system that converts received data attached to an e-mail and transmits the converted data to a portable terminal. The portable terminal displays the attached data of the e-mail on a computer. The process of converting to a possible format, the process of storing the conversion result of the process of converting into the cache storage unit 104, and the conversion result stored in the mobile terminal when the conversion request for the attached data is received from the mobile terminal A cache management program characterized by executing a transmission process is installed.

  Next, the operation of the embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a flowchart for explaining the operation when an identifier is inserted into an e-mail transmitted to the mobile terminal 105.

  The cache management unit 102 receives the email transmitted to the data processing apparatus 100 (step S101).

  Next, the cache management unit 102 checks the number of destination email addresses of the received email. When the number of destination e-mail addresses is n or more (n is a predetermined natural number of 1 or more, for example, 2) (Y in step S102), the cache management unit 102 An identifier that can uniquely identify the mail is inserted into the received electronic mail (step S103). Then, the cache management unit 102 stores the e-mail in which the identifier is inserted for each e-mail address of the transmission destination in the mail storage unit 101 (step S104).

  If the number of destination e-mail addresses is less than n (N in step S102), an e-mail is stored in the mail storage unit 101 for each e-mail address of the destination without inserting an identifier (step S104). ).

  Next, an operation for converting data attached to an e-mail will be described. FIG. 3 is a flowchart for explaining the operation when converting data attached to an e-mail.

  The cache management unit 102 receives a conversion request (conversion request) for the attached data attached to the e-mail 101a stored in the mail storage unit 101 from the portable terminal 105 (step S201).

  Next, the cache management unit 102 checks whether or not the identifier inserted by the cache management unit 102 exists in the conversion requested electronic mail 101a.

  If the identifier does not exist (N in step S202), the cache management unit 102 extracts the attached data of the email 101a requested for conversion from the mail storage unit 101 and passes it to the data conversion unit 103. The data conversion unit 103 converts the received attached data into a format that can be displayed on the portable terminal 105 (step S203).

  The cache management unit 102 receives the conversion result obtained by converting the attached data by the data conversion unit 103, and transmits it to the portable terminal 105 (step S206).

  If the identifier exists in step S202 (Y in step S202), the cache management unit 102 stores the conversion result 104a of the attached data attached to the e-mail 101a based on the identifier in the cache storage unit 104. It is checked whether or not it is stored (step S204).

  When the conversion result 104a is stored in the cache storage unit 104 (Y in step S204), the cache management unit 102 extracts the conversion result 104a from the cache storage unit 104 (step S205), and uses the extracted conversion result 104a as a portable terminal. It transmits to 105 (step S206).

  If the conversion result 104a is not stored in the cache storage unit 104 in step S204 (N in step S204), the cache management unit 102 sends the attached data of the e-mail 101a requested for conversion from the mail storage unit 101. Take out and pass to the data conversion means 103.

  The data conversion unit 103 converts the received attached data into a format that can be displayed on the portable terminal 105 (step S207). Then, the cache management unit 102 receives the conversion result obtained by converting the attached data by the data conversion unit 103 from the data conversion unit 103, and stores it in the cache storage unit 104 together with the identifier (step S208). Further, the cache management unit 102 transmits the conversion result to the portable terminal 105 (step S206).

  As described above, according to this embodiment, the conversion result converted into a format that can be displayed on the mobile terminal 105 is stored in the cache storage unit 104 together with an identifier that can be uniquely identified. The conversion result 104a can be used for the conversion request of another user who has received the e-mail 101a. Therefore, it is possible to reduce the server load for data conversion of attached data.

  Further, if one of a plurality of users who have received the same e-mail 101a has transmitted a conversion request, the conversion result 104a can be diverted and transmitted to other users without performing data conversion. Therefore, other users can reduce the conversion waiting time due to data conversion.

  Furthermore, since a plurality of users who have received the same e-mail 101a share the conversion result 104a, the storage area for cache data for storing the conversion result of attached data can be reduced.

  Next, examples of the present invention will be described. Since the configuration of the embodiment of the present invention is the same as that of the embodiment shown in FIG. 1, the same reference numerals as those in FIG.

  The operation of the embodiment of the present invention will be described with reference to the drawings. Since the operation of the present example corresponds to the operation of the embodiment, the operation of the example of the present invention will be described with reference to FIGS.

  First, an operation when an identifier is inserted into an e-mail transmitted to the mobile terminal 105 will be described with reference to FIG.

  The cache management unit 102 receives an e-mail transmitted to the data processing apparatus 100 via the Internet (step S101).

  FIG. 4 is an explanatory diagram showing an example of an electronic mail received by the cache management unit 102. In the example shown in FIG. 4, the received e-mail is “example. co. Three users, user1, user2, and user3 of jp are designated as transmission destinations (in the example shown in FIG. 4, this is the block indicated by 404). In the example shown in FIG. 4, the received e-mail is the mail body (the part shown by 402 in the example shown in FIG. 4) and the attached data (shown by 403 in the example shown in FIG. 4). This is an e-mail in the form of MIME (Multipurpose Internet Mail Extensions: stipulated in RFC 2045-2049).

  In the example shown in FIG. 4, the destination of the e-mail is the To header (404 in the example shown in FIG. 4) of the e-mail mail header (the part shown by 401 in the example shown in FIG. 4). Is determined on the basis of the e-mail address described in (1), but the destination is the SMTP (specified by Simple Mail Transfer Protocol: RFC2821) protocol used for e-mail transmission via the Internet. The transmission destination of the electronic mail may be determined based on the mail address specified by the RCPT (Receipt) command used when specifying the address.

  Next, the cache management unit 102 checks the number of destination email addresses of the received email (step S102). In the case of the email shown in FIG. 4, there are three destination email addresses.

  When the number of destination e-mail addresses is n or more (n is a predetermined natural number of 1 or more, and will be described as 2 in this embodiment) (Y in Step S102), the cache management unit 102 performs electronic processing. An identifier that can uniquely identify the mail is inserted into each part header (in the example shown in FIG. 4, the blocks indicated by 405 and 406) of the received e-mail (step S103).

  FIG. 5 is an explanatory diagram showing an example of a multi-part electronic mail in which an identifier is inserted. The identifier is, for example, the time when the e-mail was received (in the following description, it is assumed that it was 1:02:03 on April 1, 2005) and the part number of the e-mail (given sequentially from 1 for each part) In the example shown in FIG. 5, the X-TMP-ID header is inserted into each part header of the multi-part e-mail as shown in blocks 503 and 504 in the example shown in FIG.

  FIG. 6 is an explanatory diagram showing an example of an electronic mail in which an identifier is inserted. In the example shown in FIG. 5, the identifier is inserted for each part of the multipart e-mail, but in the example shown in FIG. The identifier is inserted into the mail header portion based only on the time when the message is received. That is, the identifier of each part may be dynamically generated using the identifier inserted in the mail header part and the part number.

  Specifically, for example, when the identifier inserted in the mail header portion is 20050401010203, a serial number is assigned to each attached file from the beginning of the email (for example, the identifier of the first attached file is 20050401010203_1, two The identifier of the attached file of the eye is set to 20050401010203_2).

  In the example shown in FIG. 6, the identifier is generated based on the time when the electronic mail is received, but is generated based on the serial number assigned to the electronic mail received by the data processing apparatus 100. Also good.

  Next, the cache management unit 102 sends the e-mail with the identifier inserted for each e-mail address of the transmission destination (in the example shown in FIGS. 5 and 6, there are three users, user1, user2, and user3). And stored in the mail storage means 101 (step S104).

  If the number of destination e-mail addresses is less than n (for example, 2) (N in step S102), an e-mail is sent to the mail storage unit 101 for each e-mail address of the destination without inserting an identifier. Save (step S104).

  Next, an operation for converting data attached to an e-mail will be described with reference to FIG.

  The cache management unit 102 receives from the portable terminal 105 a conversion request for the attached data attached to the mail 101a stored in the mail storage unit 101 (step S201). Hereinafter, a case where user 1 makes a conversion request for the portion (attached data) indicated by 502 in FIG. 5 stored in the mail storage unit 101 will be described as an example.

  The cache management unit 102 checks whether or not the identifier (X-TMP-ID header) inserted by the cache management unit in step S103 exists in the e-mail 101a requested to be converted.

  If the identifier does not exist (N in step S202), the attached data of the email 101a requested for conversion is taken out from the mail storage unit 101 and passed to the data conversion unit 103. The data conversion unit 103 converts the received attached data into a format that can be displayed on the portable terminal 105 (step S203). A method for converting the attached data will be described later.

  The cache management unit 102 receives the conversion result obtained by converting the attached data by the data conversion unit 103, and transmits it to the portable terminal 105 (step S206).

  If the identifier exists (Y in step S202), the attached data attached to the e-mail 101a based on the identifier information (in the example shown in FIG. 5, “20050401010203_2”). It is checked whether or not the conversion result is stored in the cache storage unit 104.

  Here, the cache storage unit 104 is, for example, a database in a table format, and manages the conversion result of the attached data using the identifier as key information. FIG. 7 is an explanatory diagram showing an example of a tabular database stored in the cache storage unit 104. In the example illustrated in FIG. 7, the cache storage unit 104 stores the conversion results 701 to 703 using the identifier information as a key.

  The cache storage unit 104 stores a tabular database as in the example shown in FIG. 7, but on a commonly used computer file system, an identifier is used as a directory name and a conversion result is obtained for each directory. It may be stored as a file.

  When the cache storage unit 104 stores the tabular database in the example shown in FIG. 7, the conversion result 702 using the identifier information (20050401010203_2) as a key is stored in the cache storage unit 104. Is shown. Therefore, the cache management unit 102 extracts the conversion result 702 from the cache storage unit 104 (step S205), and transmits the extracted conversion result 702 to the portable terminal 105 (step S206).

  FIG. 8 is an explanatory diagram showing another example of a tabular database stored in the cache storage unit 104. In the example illustrated in FIG. 8, the cache storage unit 104 stores the conversion result 701 and the conversion result 703 using the identifier information as a key.

  In step S204, if the conversion result 104a is not stored in the cache storage unit 104 (for example, if the cache storage unit 104 stores a tabular database such as the example shown in FIG. 8), the cache The management unit 102 takes out the attached data of the e-mail 101 a requested for conversion (in the example shown in FIG. 5, the part body part indicated by 502) from the mail storage unit 101 and passes it to the data conversion unit 103.

  The data conversion unit 103 converts the received attached data into a format that can be displayed on the portable terminal 105 (step S207).

  A method for converting attached data will be described. In order to convert the attached data, specifically, for example, a process for capturing the screen of the application software that can display the attached data displayed on the computer display, or a virtual printer driver that can output the image data (for example, When an operation similar to printing is performed, the application software that converts image data into an electronic file format) is executed, or original application software that analyzes the attached data and outputs the image data Or use it.

  That is, the data conversion unit 103 displays the attached data on the portable terminal 105 such as JPEG format, GIF format image data, or text data obtained by extracting only character information, using a widely known method. Convert to a possible format.

  The cache management unit 102 receives the conversion result 702 obtained by converting the attached data from the data conversion unit 103 and stores it in the cache storage unit 104 together with identifier information (20050401010203_2) (step S208). As a result, the tabular database stored in the cache storage unit 104 transitions from the state shown in FIG. 8 to the state shown in FIG. Further, the cache management unit 102 transmits the conversion result 702 to the mobile terminal 105 (step S206).

  The portable terminal 105 displays the transmitted conversion result using software such as an image viewer installed in the portable terminal 105, for example.

  Next, when the tabular database stored in the cache storage unit 104 is in the state of the example shown in FIG. 7, another user (for example, user2) who has received the e-mail of the example shown in FIG. A case will be described in which a conversion request for attached data (in the example illustrated in FIG. 5, the part body part indicated by 502) is performed by operating the mobile terminal.

  At this time, if the processing shown in FIG. 3 is performed, the cache storage unit 104 stores the conversion result 702, so that the data conversion unit 103 uses the attached data (part indicated by 502 in the example shown in FIG. 5). The cache management unit 102 transmits the conversion result 702 already stored in the cache storage unit 104 without performing the data conversion process (step S207).

  As described above, according to this embodiment, the data processing apparatus 100 can uniquely identify the conversion result 104a obtained by converting the attached data attached to the e-mail 101a into a format that can be displayed on the portable terminal 105. In addition, since the cache storage unit 104 is configured to store the conversion request 104a, the conversion result 104a can be used for a conversion request received from another user who has received the same electronic mail 101a. Therefore, it is possible to reduce the server load for data conversion of attached data.

  Further, if one of a plurality of users who have received the same e-mail 101a has transmitted a conversion request, the conversion result 104a can be diverted and transmitted to other users without performing data conversion. Therefore, the conversion waiting time for data conversion can be reduced.

  Furthermore, since the conversion result 104a is shared among a plurality of users who have received the same e-mail 101a, the storage area for cache data for storing the conversion result of attached data can be reduced.

  In the above embodiment, the data conversion unit 103 performs the conversion of the attached data after receiving the attached data conversion request from the portable terminal 105, but when the cache management unit 102 inserts the identifier in step S103, If the number of e-mail destination addresses is greater than or equal to m (m (reference value) is a predetermined natural number of 1 or more), the attached data is sent to the data conversion means 103 in advance. Then, the data conversion unit 103 may convert the attached data.

  FIG. 9 is a flowchart for explaining the operation of converting the attached data when the number of e-mail transmission destination addresses is equal to or greater than a predetermined reference value.

  The cache management unit 102 receives the email transmitted to the data processing device 100 (step S301).

  Next, the cache management unit 102 checks the number of destination email addresses of the received email (step S302). If the number of destination e-mail addresses is less than n (n is a predetermined natural number of 1 or more, for example, 2.) (N in step S302), the destination e-mail address is not inserted. Each time the e-mail is stored in the mail storage means 101 (step S305).

  When the number of destination e-mail addresses is n or more (Y in step S302), the cache management unit 102 inserts an identifier that can uniquely identify the e-mail into the received e-mail (step S303).

  When the number of destination e-mail addresses is less than m (m is a predetermined natural number greater than or equal to 1. For example, 5) (N in step S304), the cache management unit 102 inserts the identifier into the e-mail. For each destination e-mail address is stored in the mail storage means 101 (step S305).

  When the number of destination e-mail addresses is greater than or equal to m (Y in step S304), the cache management unit 102 passes the attached data of the e-mail to the data conversion unit 103. The data conversion unit 103 converts the received attached data into a format that can be displayed on the portable terminal 105 (step S306).

  The cache management unit 102 receives the conversion result obtained by converting the attached data by the data conversion unit 103 from the data conversion unit 103, and stores it in the cache storage unit 104 together with the identifier (step S307).

  Then, the cache management unit 102 stores the e-mail in which the identifier is inserted for each e-mail address of the transmission destination in the mail storage unit 101 (step S305).

  As described above, if the number of e-mail transmission destination addresses is equal to or greater than a predetermined reference value, the data conversion unit 103 is configured to convert the attached data in advance. Since the broadcast e-mail has been sent to many users, there is an effect that the conversion waiting time of the user can be reduced by performing data conversion in advance when there is a high possibility that an attached data conversion request will be made. is there.

  For example, when the conversion request is not made for a predetermined time (for example, one week) after the last conversion request, the cache management unit 102 automatically outputs the conversion result 104a. It may be deleted. In this way, there is an effect that the storage area required by the cache storage unit 104 can be reduced.

  The present invention can be applied to a mail server device that converts attached data for a portable terminal and a program for realizing a mail storage device in a computer.

It is a block diagram which shows one structural example of embodiment of the cache management system by this invention. It is a flowchart explaining the operation | movement in the case of inserting an identifier in the email transmitted to a portable terminal. It is a flowchart explaining the operation | movement in the case of converting the data attached to the email. It is explanatory drawing which shows an example of the email received by the cache management means. It is explanatory drawing which shows an example of the email of the multipart format in which the identifier was inserted. It is explanatory drawing which shows an example of the email with which the identifier was inserted. It is explanatory drawing which shows an example of the database of the table format which the cache memory | storage means has memorize | stored. It is explanatory drawing which shows the other example of the database of the table format which the cache memory | storage means has memorize | stored. It is a flowchart explaining the operation | movement which converts attachment data when the number of the addresses of the transmission destination of an email is more than the predetermined reference value.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Data processing apparatus 101 Mail storage means 101a E-mail 102 Cache management means 103 Data conversion means 104 Cache storage means 104a Conversion result 105 Portable terminal

Claims (14)

In the cache management system that converts the attached data of the received email and sends it to the mobile device,
Mail storage means for holding received emails;
A cache management means for receiving a conversion request for attached data of an e-mail from the portable terminal;
Data conversion means for converting attached data of the e-mail held by the mail storage means into a format that can be displayed by the mobile terminal;
Cache storage means for accumulating the conversion result of the data conversion means,
When the cache management means receives the conversion request for the attached data from the mobile terminal, the cache management means transmits the conversion result stored in the cache storage means to the mobile terminal ,
The cache management means adds an identifier for identifying the attached data to the email when receiving the email, and when the conversion request for the attached data is received from the portable terminal, conversion is requested with reference to the identifier. Determining whether the cache storage means stores the conversion result of the attached data,
When the data conversion means determines that the cache storage means does not store the conversion result of the attached data requested to be converted, the data conversion means converts the attached data into a format that can be displayed by the mobile terminal;
When the cache storage unit does not store the conversion result of the attached data requested to be converted, the cache management unit stores the conversion result of the data conversion unit in the cache storage unit, and stores the conversion result. When the cache storage unit stores the conversion result of the attached data that is transmitted to the portable terminal and requested to be converted, the conversion result stored in the cache storage unit without converting the attached data To the mobile device,
The cache management system, wherein the cache management means adds the identifier to the electronic mail by inserting the identifier as a part header of the multipart electronic mail . In the cache management system that converts the attached data of the received email and sends it to the mobile device,
Mail storage means for holding received emails;
A cache management means for receiving a conversion request for attached data of an e-mail from the portable terminal;
Data conversion means for converting attached data of the e-mail held by the mail storage means into a format that can be displayed by the mobile terminal;
Cache storage means for accumulating the conversion result of the data conversion means,
When the cache management means receives the conversion request for the attached data from the mobile terminal, the cache management means transmits the conversion result stored in the cache storage means to the mobile terminal,
The cache management means adds an identifier for identifying the attached data to the email when receiving the email, and when the conversion request for the attached data is received from the portable terminal, conversion is requested with reference to the identifier. Determining whether the cache storage means stores the conversion result of the attached data,
When the data conversion means determines that the cache storage means does not store the conversion result of the attached data requested to be converted, the data conversion means converts the attached data into a format that can be displayed by the mobile terminal;
When the cache storage unit does not store the conversion result of the attached data requested to be converted, the cache management unit stores the conversion result of the data conversion unit in the cache storage unit, and stores the conversion result. When the cache storage unit stores the conversion result of the attached data that is transmitted to the portable terminal and requested to be converted, the conversion result stored in the cache storage unit without converting the attached data To the mobile device,
The cache management means adds the identifier to the email by inserting the identifier as a mail header of the email.
A cache management system characterized by that . The cache management unit causes the data conversion unit to convert the attached data in advance and stores the conversion result in the cache storage unit when the number of e-mail transmission destinations is equal to or greater than a predetermined reference value. The cache management system according to claim 1 or 2 . The cache management system according to any one of claims 1 to 3 , wherein the cache management unit deletes a conversion result for which conversion has not been requested for a predetermined time or longer from the cache storage unit. In the cache management method of converting the attached data of the received email and sending it to the mobile terminal,
Adding the identifier to the email by inserting an identifier identifying the attached data as the part header of the multipart email when receiving the email,
When receiving the conversion request for the attached data from the portable terminal, with reference to the identifier, it is determined whether or not the conversion result of the attached data requested for conversion is accumulated,
If the conversion result is accumulated, the conversion result is transmitted to the mobile terminal without converting the attached data,
If the conversion result is not accumulated, the attached data of the e-mail held by the mail storage means holding the received e-mail is converted into a format that can be displayed on the portable terminal, and the conversion result is converted to the identifier. And a cache management method , wherein the conversion result is transmitted to the portable terminal . In the cache management method of converting the attached data of the received email and sending it to the mobile terminal,
At the time of receiving an e-mail, by inserting an identifier for identifying attached data as a mail header, the identifier is added to the e-mail,
When receiving the conversion request for the attached data from the portable terminal, with reference to the identifier, it is determined whether or not the conversion result of the attached data requested for conversion is accumulated,
If the conversion result is accumulated, the conversion result is transmitted to the mobile terminal without converting the attached data,
If the conversion result is not accumulated, the attached data of the e-mail held by the mail storage means holding the received e-mail is converted into a format that can be displayed on the portable terminal, and the conversion result is converted to the identifier. And store the result of the conversion to the mobile terminal
And a cache management method. The cache management method according to claim 5 or 6 , wherein, when the number of e-mail transmission destinations is equal to or greater than a predetermined reference value, the attached data is converted in advance and the conversion result is accumulated. The cache management method according to any one of claims 5 to 7 , wherein a conversion result that has not been requested for conversion for a predetermined time or longer is deleted. In the cache management program installed in the cache management system that converts the attached data of the received email and sends it to the mobile terminal,
On the computer,
A process of adding the identifier to the email by inserting an identifier for identifying the attached data as a part header of the email of the multipart format when receiving the email;
When receiving a conversion request for attached data from a mobile terminal, referring to the identifier, and determining whether or not the conversion result of the attached data requested for conversion is accumulated;
When the conversion result is accumulated in the storage means, the process of transmitting the conversion result to the mobile terminal without converting the attached data;
If the conversion result is not stored in the storage means, the attached data is converted into a format that can be displayed on the mobile terminal, the conversion result is stored in the storage means together with the identifier, and the conversion result is stored in the mobile terminal. A cache management program for executing processing to be transmitted to the client . In the cache management program installed in the cache management system that converts the attached data of the received email and sends it to the mobile terminal,
On the computer,
A process of adding the identifier to the email by inserting an identifier identifying the attached data as a mail header when receiving the email;
When receiving a conversion request for attached data from a mobile terminal, referring to the identifier, and determining whether or not the conversion result of the attached data requested for conversion is accumulated;
When the conversion result is accumulated in the storage means, the process of transmitting the conversion result to the mobile terminal without converting the attached data;
If the conversion result is not stored in the storage means, the attached data is converted into a format that can be displayed on the mobile terminal, the conversion result is stored in the storage means together with the identifier, and the conversion result is stored in the mobile terminal. Process to send to
Cache management program for. On the computer,
The cache management program according to claim 9 or 10 , wherein when the number of e-mail transmission destinations is equal to or greater than a predetermined reference value, the attached data is converted in advance and a process for accumulating the conversion result is executed. On the computer,
The cache management program according to any one of claims 9 to 11 , wherein a process for deleting a conversion result that has not been requested for conversion for a predetermined time or longer is executed. In the cache management server that converts the attached data of the received email and sends it to the mobile terminal,
Mail storage means for holding received emails;
A cache management means for receiving a conversion request for attached data of an e-mail from the portable terminal;
Data conversion means for converting attached data of the e-mail held by the mail storage means into a format that can be displayed by the mobile terminal;
Cache storage means for accumulating the conversion result of the data conversion means,
When the cache management means receives the conversion request for the attached data from the mobile terminal, the cache management means transmits the conversion result stored in the cache storage means to the mobile terminal ,
The cache management means adds an identifier for identifying the attached data to the email when receiving the email, and when the conversion request for the attached data is received from the portable terminal, conversion is requested with reference to the identifier. Determining whether the cache storage means stores the conversion result of the attached data,
When the data conversion means determines that the cache storage means does not store the conversion result of the attached data requested to be converted, the data conversion means converts the attached data into a format that can be displayed by the mobile terminal;
When the cache storage unit does not store the conversion result of the attached data requested to be converted, the cache management unit stores the conversion result of the data conversion unit in the cache storage unit, and stores the conversion result. When the cache storage unit stores the conversion result of the attached data that is transmitted to the portable terminal and requested to be converted, the conversion result stored in the cache storage unit without converting the attached data To the mobile device,
The cache management server , wherein the cache management means adds the identifier to the e-mail by inserting the identifier as a part header of the multi-part format e-mail . In the cache management server that converts the attached data of the received email and sends it to the mobile terminal,
Mail storage means for holding received emails;
A cache management means for receiving a conversion request for attached data of an e-mail from the portable terminal;
Data conversion means for converting attached data of the e-mail held by the mail storage means into a format that can be displayed by the mobile terminal;
Cache storage means for accumulating the conversion result of the data conversion means,
When the cache management means receives the conversion request for the attached data from the mobile terminal, the cache management means transmits the conversion result stored in the cache storage means to the mobile terminal,
The cache management means adds an identifier for identifying the attached data to the email when receiving the email, and when the conversion request for the attached data is received from the portable terminal, conversion is requested with reference to the identifier. Determining whether the cache storage means stores the conversion result of the attached data,
When the data conversion means determines that the cache storage means does not store the conversion result of the attached data requested to be converted, the data conversion means converts the attached data into a format that can be displayed by the mobile terminal;
When the cache storage unit does not store the conversion result of the attached data requested to be converted, the cache management unit stores the conversion result of the data conversion unit in the cache storage unit, and stores the conversion result. When the cache storage unit stores the conversion result of the attached data that is transmitted to the portable terminal and requested to be converted, the conversion result stored in the cache storage unit without converting the attached data To the mobile device,
The cache management means adds the identifier to the email by inserting the identifier as a mail header of the email.
A cache management server characterized by that.

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