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UTIL Protocols
--------------
Transactions are executed in two phases:
1) PREPARE
2) EXECUTE
PREPARE PHASE
-------------
1) ** REQUEST **
Client (any block) requests prepare service from Util:
Client --UTIL_PREPARE_REQ--> Util
...
Client --UTIL_PREPARE_REQ--> Util
2) ** DICTINFO **
Util requests Dict for information about table:
Util --GET_TABINFOREQ--> Dict
Util <--DICTTABINFO-- Dict
...
Util <--DICTTABINFO-- Dict
3) ** PREPARE **
Operation (= transaction) is prepared (DbUtil::prepareOperation)
a) AttrMapping is created (a map used to read of the
actual execute request attribute values and put them in KEYINFO)
b) TC Signal train is prepared
4) ** CONFIRM **
Request is confirmed
Client <--UTIL_PREPARE_CONF-- Util
EXECUTE PHASE
-------------
1) Client (any block) requests execute service from Util:
(Execute can be INSERT, DELETE,...)
Client --UTIL_EXECUTE_REQ--> Util (Multi-signals not yet implemented)
...
Client --UTIL_EXECUTE_REQ--> Util
2) Util --TCKEYREQ--> tc
Util --KEYINFO--> tc (sometimes) (Not yet implemented)
...
Util --KEYINFO--> tc
Util --ATTRINFO--> tc (sometimes)
...
Util --ATTRINFO--> tc
3) Util <--TCKEYCONF-- tc
Util --TC_COMMIT_ACK-->tc (sometimes)
(in parallel with)
Util <--TRANSID_AI-- tc (sometimes)
...
Util <--TRANSID_AI-- tc
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