| 1 | ===== DBDriver =====
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| 2 |
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| 3 | Note that there are a couple of Drivers that could be further separated to
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| 4 | have even better OO, but I started to get bogged down in multiple inheritence
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| 5 | problems so I left them as is for now. For instance, separating PipedExecutable
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| 6 | support from the 70HyphenFormat driver would increase flexibility, but then it
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| 7 | becomes tricky to say which should inherit from which (in a single inheritence)
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| 8 | or what order methods should be resolved (in multiple inheritence).
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| 9 |
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| 10 | Notes:
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| 11 | * Didn't finish refactoring SQL based drivers
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| 12 | * ServerDrivers refactoring not done.
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| 13 | * Since TDBCluster was the only cluster, didn't do MergableDriver
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| 14 |
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| 15 | ==== Inheritence Overview ====
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| 16 |
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| 17 | * BaseDBDriver - superclass of all drivers. Some shared utility methods
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| 18 | including support for persistent connections (ala TDB).
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| 19 | Thus this is a candidate for separating out the the
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| 20 | PersistentConnectionsDriver.
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| 21 | * 70HyphenFormat - drivers that write and read their data via pipes to
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| 22 | external executables. Data is in simple Greenstone
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| 23 | archive form (i.e. key/value pairs and separated by
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| 24 | seventy hyphens) - this is a candidate for further
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| 25 | separating out a PipedExecutableDriver.
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| 26 | * GDBM - makes use of GDBM utils (txt2db, db2txt etc)
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| 27 | * GDBMTXTGZ - makes use of gzip (for later use with GDBM)
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| 28 | * JDBM - makes use of jdbm.jar and JDBMWrapper.jar
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| 29 | * TDB - makes use of TDB utils (txt2tdb, tdb2txt etc)
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| 30 | * SQLDrivers - drivers that read/write their data using SQL commands
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| 31 | * SQLITE - uses calls to SQLite3 via the command line
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| 32 | * MSSQL
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| 33 | * ServerDrivers - drivers that act as clients to externally running servers
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| 34 | * GDBMS - makes use of a custom GDBM server
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| 35 | * TDBS - makes use of a custom TDB server
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| 36 | * MergableDrivers - ???
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| 37 | * TDBC - ??? Knows how to merge several TDB files into one.
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