internal package Foswiki::Contrib::DBCacheContrib::Archivist
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internal package Foswiki::Contrib::DBCacheContrib::Archivist
This is an abstract base class defining the interface to a DBCacheContrib
archivist. An archivist handles the mechanics of storage of data on disc.
It serves up maps and arrays that obey the
Foswiki::Contrib::DBCacheContrib::Array and
Foswiki::Contrib::DBCacheContrib::Map interfaces.
NOTE: this is a pure virtual base class, and cannot be instantiated on its own.
ObjectMethod newArray() → $array
Construct a new Foswiki::Contrib::DBCacheContrib::Map in the DB. See
the documentation of Foswiki::Contrib::DBCacheContrib::Map for information
on how to tie this to a perl hash.
ObjectMethod newArray() → $array
Construct a new Foswiki::Contrib::DBCacheContrib::Array in the DB. See
the documentation of Foswiki::Contrib::DBCacheContrib::Array for information
on how to tie this to a perl array.
ObjectMethod sync()
Sync data changes to disc. Some archivist implementations may cache
data changes in memory. A call to this method ensures that the DB on
disc is synchronised with that memory representation.
ObjectMethod getRoot() → $map
Return the DB root map. The root of the DB is always of type
Foswiki::Contrib::DBCacheContrib::Map, under which you can create keys
that point to maps or arrays.
ObjectMethod clear()
Completely clear down the DB; removes all data and creates a new root.
Intended primarily for use in testing.
ObjectMethod isModified()
Checks whether the cache needs to be reloaded from disk in case it changed
by some other process.
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