Data/Transfer/Sync.README.text

NEWS
   2003-02-09  -  backward compatibility with custom application

      - Tangram <-> .csv
      - Tangram <-> mysql
      - Tangram <-> perl-code

   2003-01-18  -  start integration with Torus

      - MAPI <-> LDAP
      - please look at http://www.netfrag.org/horde/chora/cvs.php/perl/scripts/outlook2ldap/

   2002-10-10  -  initial commit

      - Tangram <-> mysql

DESCRIPTION
      Data::Transfer::Sync is a module providing a generic synchronization process
      across arbitrary/multiple storages based on a ident/checksum mechanism.
      It sits on top of Data::Storage.

REQUIREMENTS
      For full functionality:
        Data::Compare
        Data::Storage
        Data::Transform
        ... and all their dependencies.

AUTHORS / COPYRIGHT / LICENSE
      The Data::Transfer::Sync module is Copyright (c) 2002 Andreas Motl.
      All rights reserved.

      Contributions by Sebastian Utz <su@tunemedia.de> and 
      Jan Hoffmann <jan@romain-volk.com>.

      You may distribute it under the terms of either the GNU General Public
      License or the Artistic License, as specified in the Perl README file.

SUPPORT / WARRANTY
      Data::Transfer::Sync is free software. IT COMES WITHOUT WARRANTY OF ANY KIND.

EXAMPLE OUTPUT CHUNKS
  synchronizing orm objects against entries in a .csv file - 17 items modified

      notice: PULL INTO backend NODE * TYPE Country SELECT NODE * TYPE [n/a] FROM base USING MODULE BizWorks::ResourceMapping;
      notice: OEF::Script::AbstractFeeder:
          - Loading data of type [n/a] and
            filtered by * from the storage named base
            to the storage named backend - filtered by *.
          - Will attempt to convert the data to Country.
      info: Data::Transfer::Sync::API->syncNodes: source=backend/* [Country] <- target=base/* []
      :c:c:c:c:c:c:c:ctr:c:c:c:c:c:c:c:ctr:c:c:c:c:c:c:ctr:c:ctr:c:c:c:c:c:c:c:c:c:c:c:ctr:c:c:c:ctr:c:c:c:c:c:c:c:ctr:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c
      :c:c:c:c:c:c:c:c:ctr:c:c:c:c:c:c:c:c:c:c:c:ctr:c:c:c:c:ctr:c:c:c:ctr:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:ctr:ctr:c:c:c:c:ctr:c:c:c:c:c:c:c
      :c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:ctr:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:ctr:c:c:ctr:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c
      info: Data::Transfer::Sync::Core->_startsync: statistics: in_sync: 180  /  total: 197  /  attempt_modify: 17  /  ok: 17

  synchronizing orm objects against entries in a .csv file - in-sync

      notice: PULL INTO backend NODE * TYPE Country SELECT NODE * TYPE [n/a] FROM base USING MODULE BizWorks::ResourceMapping;
      notice: OEF::Script::AbstractFeeder:
          - Loading data of type [n/a] and
            filtered by * from the storage named base
            to the storage named backend - filtered by *.
          - Will attempt to convert the data to Country.
      info: Data::Transfer::Sync::API->syncNodes: source=backend/* [Country] <- target=base/* []
      :c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c
      :c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c
      :c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c
      info: Data::Transfer::Sync::Core->_startsync: statistics: in_sync: 197  /  total: 197

BUGS
      When in "import" mode for windows file - DBD::AutoCSV may hang.
      Hint: Maybe the source node contains an ident-, but no checksum-column?

USER LEVEL ERRORS
   Mapping

      - - - - - - - - - - - - - - - - - - - - - - - - - -
      info: BizWorks::Process::Setup->syncResource( source_node Currency mode PULL erase 0 import 0 )critical: BizWorks::Process::Setup->startSync: Can't access mapping for node "Currency" - please check BizWorks::ResourceMapping.
      - - - - - - - - - - - - - - - - - - - - - - - - - -
      You have to create a sub for each node used in synchronization inside named Perl module. The name of this sub _must_ match
      the name of the node you want to sync. This sub holds mapping metadata to give the engine hints about how 
      to access the otherwise generic nodes.
      - - - - - - - - - - - - - - - - - - - - - - - - - -

   DBD::AutoCSV's rulebase

      - - - - - - - - - - - - - - - - - - - - - - - - - -
      info: BizWorks::Process::Setup->syncResource( source_node Currency mode PULL erase 0 import 0 )
      info: Data::Transfer::Sync->syncNodes: source=L/Currency <- target=R/currencies.csv
  
      Execution ERROR: Error while scanning: Missing first row or scanrule not applied. at C:/home/amo/develop/netfrag.org/nfo/perl/libs/DBD/CSV.p
      m line 165, <GEN9> line 1.
       called from C:/home/amo/develop/netfrag.org/nfo/perl/libs/Data/Storage/Handler/DBI.pm at 123.
  
      DBI-Error: DBD::AutoCSV::st fetchrow_hashref failed: Attempt to fetch row from a Non-SELECT statement
      notice: Data::Transfer::Sync->syncNodes: No nodes to synchronize.
      - - - - - - - - - - - - - - - - - - - - - - - - - -
      DBD::AutoCSV contains a rulebase which is spooled down while attempting to guess the style of the csv file regarding
      parameters like newline (eol), column-seperation-character (sep_char), quoting character (quote_char).
      If this spool runs out of entries and no style could be resolved, DBD::CSV dies causing this "Execution ERROR" which
      results in a "DBI-Error" afterwards.
      - - - - - - - - - - - - - - - - - - - - - - - - - -

   Check structure of source node

      - - - - - - - - - - - - - - - - - - - - - - - - - -
      info: Data::Transfer::Sync->syncNodes: source=L/Currency <- target=R/currencies.csv
      critical: Data::Transfer::Sync->syncNodes: Can not synchronize: No ident found in source node, maybe try to "import" this node first.
      - - - - - - - - - - - - - - - - - - - - - - - - - -
      If lowlevel detection succeeds, but no other required informations are found, this message is issued.
      "Other informations" might be:
        - column-header-row completely missing
        - ident column is empty
      - - - - - - - - - - - - - - - - - - - - - - - - - -

   Modify structure of source node

      - - - - - - - - - - - - - - - - - - - - - - - - - -
      info: Data::Transfer::Sync->syncNodes: source=L/Currency <- target=R/currencies.csv
      info: Data::Transfer::Sync->_prepareNode_MetaProperties( descent source )
      warning: Data::Transfer::Sync->_prepareNode_MetaProperties: node is lacking meta properties - will try to alter...
      SQL ERROR: Command 'ALTER' not recognized or not supported!
  
      SQL ERROR: Command 'ALTER' not recognized or not supported!
      - - - - - - - - - - - - - - - - - - - - - - - - - -
      The Engine found a node which structure does not match the required. It tries to alter this automatically - only when doing "import" - 
      but the DBD driver (in this case DBD::CSV) gets in the way croaking not to be able to do this.
      This could also appear if your database connection has insufficient rights to modify the database structure.
      DBD::CSV croaks because it doesn't implement the ALTER command, so please edit your columns manually.
      Hint: Add columns with the names of your "ident" and "checksum" property specifications.
      - - - - - - - - - - - - - - - - - - - - - - - - - -

   Load source node by ident

      - - - - - - - - - - - - - - - - - - - - - - - - - -
      info: Data::Transfer::Sync->_prepareNode_DummyIdent( descent source )
      pcritical: Data::Transfer::Sync->_modifyNode failed: "source" node is empty.
      - - - - - - - - - - - - - - - - - - - - - - - - - -
      The source node could not be loaded. Maybe the ident is missing. Please check manually.
      Hint: Like above, the ident and/or checksum columns may be missing....
      - - - - - - - - - - - - - - - - - - - - - - - - - -

TODO
      o sub _resolveIdentProvider
      x wrap _doModifySource and _doTransferTarget around a core function which can change virtually any type of node
      x split this module up into Sync.pm, Sync/Core.pm, Sync/Compare.pm and Sync/Compare/Checksum.pm
      o introduce _compareNodes as a core method and wrap it around methods in Sync/Compare/Checksum.pm
      x introduce Sync/Compare/MyComparisonImplementation.pm
      o some generic deferring method - e.g. "$self->defer(action)" - to be able to accumulate a bunch of actions for later processing
         - this implies everything done is _really_ split up into generic actions - how else would we defer them???
         - example uses:
            - fetch whole checksum list from node
            - remember source ident retransmits
         - remember: this is convenient - and maybe / of course faster - but we'll loose "per-node-atomic" operations
      o feature: mechanism to implicit inject checksum property to nodes (alter table / modify schema)
      o expand statistics / keep track of:
        - touched/untouched nodes
      o full sync
        - just do a push and a pull for now but use stats for touched nodes in between to speed up things
      o introduce some new metadata flags for a descent
        - isNewNodePropagator
        x isWriteProtected

1	joko	1.3	NEWS
2	joko	1.4	2003-02-09 - backward compatibility with custom application
3	joko	1.3
4	joko	1.4	- Tangram <-> .csv
5			- Tangram <-> mysql
6			- Tangram <-> perl-code
7	joko	1.3
8	joko	1.4	2003-01-18 - start integration with Torus
9
10			- MAPI <-> LDAP
11			- please look at http://www.netfrag.org/horde/chora/cvs.php/perl/scripts/outlook2ldap/
12
13			2002-10-10 - initial commit
14
15			- Tangram <-> mysql
16	joko	1.3
17	joko	1.1	DESCRIPTION
18	joko	1.4	Data::Transfer::Sync is a module providing a generic synchronization process
19			across arbitrary/multiple storages based on a ident/checksum mechanism.
20			It sits on top of Data::Storage.
21	joko	1.1
22			REQUIREMENTS
23			For full functionality:
24	joko	1.4	Data::Compare
25	joko	1.1	Data::Storage
26			Data::Transform
27	joko	1.4	... and all their dependencies.
28
29			AUTHORS / COPYRIGHT / LICENSE
30			The Data::Transfer::Sync module is Copyright (c) 2002 Andreas Motl.
31			All rights reserved.
32	joko	1.1
33	joko	1.4	Contributions by Sebastian Utz <su@tunemedia.de> and
34			Jan Hoffmann <jan@romain-volk.com>.
35	joko	1.1
36	joko	1.4	You may distribute it under the terms of either the GNU General Public
37			License or the Artistic License, as specified in the Perl README file.
38	joko	1.1
39			SUPPORT / WARRANTY
40	joko	1.4	Data::Transfer::Sync is free software. IT COMES WITHOUT WARRANTY OF ANY KIND.
41
42			EXAMPLE OUTPUT CHUNKS
43			synchronizing orm objects against entries in a .csv file - 17 items modified
44
45			notice: PULL INTO backend NODE * TYPE Country SELECT NODE * TYPE [n/a] FROM base USING MODULE BizWorks::ResourceMapping;
46			notice: OEF::Script::AbstractFeeder:
47			- Loading data of type [n/a] and
48			filtered by * from the storage named base
49			to the storage named backend - filtered by *.
50			- Will attempt to convert the data to Country.
51			info: Data::Transfer::Sync::API->syncNodes: source=backend/* [Country] <- target=base/* []
52			:c:c:c:c:c:c:c:ctr:c:c:c:c:c:c:c:ctr:c:c:c:c:c:c:ctr:c:ctr:c:c:c:c:c:c:c:c:c:c:c:ctr:c:c:c:ctr:c:c:c:c:c:c:c:ctr:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c
53			:c:c:c:c:c:c:c:c:ctr:c:c:c:c:c:c:c:c:c:c:c:ctr:c:c:c:c:ctr:c:c:c:ctr:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:ctr:ctr:c:c:c:c:ctr:c:c:c:c:c:c:c
54			:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:ctr:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:ctr:c:c:ctr:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c
55			info: Data::Transfer::Sync::Core->_startsync: statistics: in_sync: 180 / total: 197 / attempt_modify: 17 / ok: 17
56
57			synchronizing orm objects against entries in a .csv file - in-sync
58
59			notice: PULL INTO backend NODE * TYPE Country SELECT NODE * TYPE [n/a] FROM base USING MODULE BizWorks::ResourceMapping;
60			notice: OEF::Script::AbstractFeeder:
61			- Loading data of type [n/a] and
62			filtered by * from the storage named base
63			to the storage named backend - filtered by *.
64			- Will attempt to convert the data to Country.
65			info: Data::Transfer::Sync::API->syncNodes: source=backend/* [Country] <- target=base/* []
66			:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c
67			:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c
68			:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c:c
69			info: Data::Transfer::Sync::Core->_startsync: statistics: in_sync: 197 / total: 197
70	joko	1.1
71			BUGS
72			When in "import" mode for windows file - DBD::AutoCSV may hang.
73	joko	1.3	Hint: Maybe the source node contains an ident-, but no checksum-column?
74	joko	1.1
75			USER LEVEL ERRORS
76			Mapping
77
78			- - - - - - - - - - - - - - - - - - - - - - - - - -
79			info: BizWorks::Process::Setup->syncResource( source_node Currency mode PULL erase 0 import 0 )critical: BizWorks::Process::Setup->startSync: Can't access mapping for node "Currency" - please check BizWorks::ResourceMapping.
80			- - - - - - - - - - - - - - - - - - - - - - - - - -
81			You have to create a sub for each node used in synchronization inside named Perl module. The name of this sub _must_ match
82			the name of the node you want to sync. This sub holds mapping metadata to give the engine hints about how
83			to access the otherwise generic nodes.
84			- - - - - - - - - - - - - - - - - - - - - - - - - -
85
86			DBD::AutoCSV's rulebase
87
88			- - - - - - - - - - - - - - - - - - - - - - - - - -
89			info: BizWorks::Process::Setup->syncResource( source_node Currency mode PULL erase 0 import 0 )
90			info: Data::Transfer::Sync->syncNodes: source=L/Currency <- target=R/currencies.csv
91
92			Execution ERROR: Error while scanning: Missing first row or scanrule not applied. at C:/home/amo/develop/netfrag.org/nfo/perl/libs/DBD/CSV.p
93			m line 165, <GEN9> line 1.
94			called from C:/home/amo/develop/netfrag.org/nfo/perl/libs/Data/Storage/Handler/DBI.pm at 123.
95
96			DBI-Error: DBD::AutoCSV::st fetchrow_hashref failed: Attempt to fetch row from a Non-SELECT statement
97			notice: Data::Transfer::Sync->syncNodes: No nodes to synchronize.
98			- - - - - - - - - - - - - - - - - - - - - - - - - -
99			DBD::AutoCSV contains a rulebase which is spooled down while attempting to guess the style of the csv file regarding
100			parameters like newline (eol), column-seperation-character (sep_char), quoting character (quote_char).
101			If this spool runs out of entries and no style could be resolved, DBD::CSV dies causing this "Execution ERROR" which
102			results in a "DBI-Error" afterwards.
103			- - - - - - - - - - - - - - - - - - - - - - - - - -
104
105			Check structure of source node
106
107			- - - - - - - - - - - - - - - - - - - - - - - - - -
108			info: Data::Transfer::Sync->syncNodes: source=L/Currency <- target=R/currencies.csv
109			critical: Data::Transfer::Sync->syncNodes: Can not synchronize: No ident found in source node, maybe try to "import" this node first.
110			- - - - - - - - - - - - - - - - - - - - - - - - - -
111			If lowlevel detection succeeds, but no other required informations are found, this message is issued.
112			"Other informations" might be:
113			- column-header-row completely missing
114			- ident column is empty
115			- - - - - - - - - - - - - - - - - - - - - - - - - -
116
117			Modify structure of source node
118
119			- - - - - - - - - - - - - - - - - - - - - - - - - -
120			info: Data::Transfer::Sync->syncNodes: source=L/Currency <- target=R/currencies.csv
121			info: Data::Transfer::Sync->_prepareNode_MetaProperties( descent source )
122			warning: Data::Transfer::Sync->_prepareNode_MetaProperties: node is lacking meta properties - will try to alter...
123			SQL ERROR: Command 'ALTER' not recognized or not supported!
124
125			SQL ERROR: Command 'ALTER' not recognized or not supported!
126			- - - - - - - - - - - - - - - - - - - - - - - - - -
127			The Engine found a node which structure does not match the required. It tries to alter this automatically - only when doing "import" -
128			but the DBD driver (in this case DBD::CSV) gets in the way croaking not to be able to do this.
129			This could also appear if your database connection has insufficient rights to modify the database structure.
130			DBD::CSV croaks because it doesn't implement the ALTER command, so please edit your columns manually.
131			Hint: Add columns with the names of your "ident" and "checksum" property specifications.
132			- - - - - - - - - - - - - - - - - - - - - - - - - -
133
134			Load source node by ident
135
136			- - - - - - - - - - - - - - - - - - - - - - - - - -
137			info: Data::Transfer::Sync->_prepareNode_DummyIdent( descent source )
138			pcritical: Data::Transfer::Sync->_modifyNode failed: "source" node is empty.
139			- - - - - - - - - - - - - - - - - - - - - - - - - -
140			The source node could not be loaded. Maybe the ident is missing. Please check manually.
141			Hint: Like above, the ident and/or checksum columns may be missing....
142			- - - - - - - - - - - - - - - - - - - - - - - - - -
143
144			TODO
145	joko	1.4	o sub _resolveIdentProvider
146			x wrap _doModifySource and _doTransferTarget around a core function which can change virtually any type of node
147			x split this module up into Sync.pm, Sync/Core.pm, Sync/Compare.pm and Sync/Compare/Checksum.pm
148			o introduce _compareNodes as a core method and wrap it around methods in Sync/Compare/Checksum.pm
149			x introduce Sync/Compare/MyComparisonImplementation.pm
150			o some generic deferring method - e.g. "$self->defer(action)" - to be able to accumulate a bunch of actions for later processing
151	joko	1.1	- this implies everything done is _really_ split up into generic actions - how else would we defer them???
152			- example uses:
153			- fetch whole checksum list from node
154			- remember source ident retransmits
155			- remember: this is convenient - and maybe / of course faster - but we'll loose "per-node-atomic" operations
156	joko	1.4	o feature: mechanism to implicit inject checksum property to nodes (alter table / modify schema)
157			o expand statistics / keep track of:
158	joko	1.1	- touched/untouched nodes
159	joko	1.4	o full sync
160	joko	1.1	- just do a push and a pull for now but use stats for touched nodes in between to speed up things
161	joko	1.4	o introduce some new metadata flags for a descent
162	joko	1.1	- isNewNodePropagator
163	joko	1.4	x isWriteProtected
164	joko	1.3
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