Keeping%20It%20in%20Sync

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Keeping It in Sync

• HotSync-ing Palm Programs, Java Style
• by Mike Kirschman

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The Palm Model

• Do minor processing on the handheld.
• Minor data entry
• Data display (often only a subset of data)
• Small remote database queries (if capable)
• Etc.
• Do major processing on PC/Laptop
• Large data entry
• Extended processing
• Internet (though, some appearing on HH)
• Larger database queries.

3
The Conduit Bridging the Gap

• Once the processing is done on the HH or PC, the
  other needs to be updated of the data changes.
  The vehicle for these changes is the Conduit.
• The coding options presented in the Palm OS
  Conduit Development Kit (CDK)
• C
• Java
• Com

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Java Conduits

• Overall Design
• Read HH data to PC (HotSync)
• Read PC copy of data into conduit (see diagram ?)
• Read PC data
• Determine type of sync necessary
• HH ? PC
• HH ? PC
• HH ? PC
• Write data to HH or PC as necessary

gnt.GNTConduit
1 Request DB Open
palm.conduit.SyncManager (opens HH database)
gnt.GNTOptions
2 Read this Record
3 ReadOptions
gnt.GNTRecord
4 Read this File
gnt.GNTConduit
5 Repeat for each file (known by options)
(Left for a later time)
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Data Stream to Read
Text Database, Record 0
File 1 Boolean editable Boolean compressed UInt16
recNum UInt16 numGraphics UInt16
category Char65 name
File N Boolean editable Boolean compressed UInt16
recNum UInt16 numGraphics UInt16
category Char65 name
Options UInt16 openFile UInt16 openGraphic UInt16
numRecs UInt32 optionsRecSize

Text Database, Record j ? 1..N
Char fileText
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More Information

• Palm OS Development http//www.palmone.com/us/
  developers
• Other Palm Resources http//ardiri.com (look
  for Palm Development Kit, PilRC, jCode)
• Conduit Development http//www.palmos.com/dev/t
  ech/conduits
• IDE-based development http//www.metrowerks.com
  /MW/develop/Wireless/PalmOS/Professional/