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Overview
Collection communication involves both messaging and data transmission. The messaging part is illustrate below
The details on alams are described under Alarm communication. File list, checksums and salts, follows the same patter as for Get communication. The "get" message is only sent to one pillar.
The data trasmission involved is described under Data transmission protocol. It can be used either in transmission of message parameters or data as a result of a request.
Sequence diagrams
Ckecksums
The sequence diagram for checks corresponds to last part of a get operattion. The sequence diagram is given below.
Checksum messages
The getChecksums message contains the same information as a get, except that it also must include:
- Checksums algorithm for checksums
In case we want to open possibility to give resulting checksums in a respons message then the following parameter must be included
- Optionally max count of checksummer in svarbesked
Furthermore we will need a getChecksumsReplyData message.
Checksum data to be transmitted
The data must as minimum include:
- Number of checksums included
- Repeatedly for each file:
- the file id
- the file checksum
- the time when the checksum was calculated (especially for off-line medias, there can be long inteervals between calculations, - in such cases this information is crucial for alarming)
File lists
Evt. max antal filer i svarbesked
Specifikt for checksummer skal denne information indeholde:
- antal filer
- information per fil (evt. repeterbar)
- fil id
- tidspunkt hvor filen sidst blev set (hvis det ikke er online, kan denne information være vigtig for alarmering)
Salts
Evt. ekstra tegn til direkte checksumscheck (Rosenthal NONCE)
Evt. max antal checksummer i svarbesked
Minimums informationer i request beskeder:
Specifikt for checksummer skal denne information indeholde:
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Get Status - Communication. Communication for getFileIDs can either be via the Get File IDs client or be the same as for the Get File IDs client (See Get File IDs Communications). Similar for the getChecksums communication, this can either be via the Get Checksums client or be the same as for the Get Checksums client (See Get Checksums Communication).
Each message is only sent to one pillar.