Develop API for different options of dealing with EPSchema

[santoshphilip]

We have

idf = IDF( .... )

With many possibilities for how to read the EPSchema. Consider writing different functions for each of them:

• Keep EPSchema in memory. Only one EPSchema allowed to be in memory
• Read EPSchema from dbm
  • have a cache of any element of the EPSchema read from the dbm
  • no cache. Re-read from dbM each time

Where is the dbm

• in the ~/home/.epschema directory
• in another location
• how do you know which dbm to use

when/how is the dbm created

• created in memory
• created in home directory
• created in another location

list new issues coming from this issue

• Simple way to open an epj file
  • EPJ_Simple(epjname, dbm_cache=True) - issue #111 (closed)

[santoshphilip]

possible design. The options below are mutually exclusive. You can pick any one of them

• EPSchema in memory (now only one schema allowed)
• EPSchema in dbm (Multipe EPSchema is possible)
  • dbm with cache
  • dbm no cache

Consider opening without EpSchema. Add EPSchema later.

[santoshphilip]

notes on with dbm steps:

• dbm location
  • home
  • other
• create dbm if it doesn't exist
• update or read dbm_dictionary (that keeps track of version and dbm location)

[santoshphilip]

make branch i110_EPSchema

use that as a base branch as you develop parts of this issue - expanded into smaller issues

[santoshphilip]

opened issue #111

write EPJ_Simple(epjname, dbm_cache=True)

[santoshphilip]

closed issue #111

EPJ_Simple(epjname, dbm_cache=True)

[santoshphilip]

try to write an in memory dbm.

Things to keep in mind:

• I think I have a function that does this - see eppy3000.dbm_functions.schemaindbm.db_in_memory
• Memory is taken up - try not to have more than one in memory (do this limitation later)
• cache is not really needed, except in cache the values are are dicts. In dbm values are text

[santoshphilip]

hold off on the in-memory dbm.

Devlop a debug log for the cache - to make sure that it is working correctly

write to log on following events:

• write to cache
• read from cache

The cahce is a dict or an Munch. add the log to __setattr__ and __ getattr__

make a branch from the closed issue #111