Package bw :: Package poseidon :: Module indexoceanserver :: Class IndexOcean

Class IndexOcean

                object --+    
                         |    
ioengine.PersistenceEngine --+
                             |
                            IndexOcean

This class wraps around a regular ocean instance and manages multiple indexes (based on key-types) and makes available functions which take advantage of the indexes.

This frees Poseidon from actually handling index specific activities.

This class takes care of all issues pertaining to transactioning to make sure that Poseidon doesn't have to worry about it

Instance Methods

__init__(self, fn, options)
x.__init__(...) initializes x; see x.__class__.__doc__ for signature

has_key(self, key)
Do existence checking in indexocean server.

load_cache(self)

load_index(self)

recreate_index(self)
This method recreates the index file - not the index structure in memory

slice(self, i, j)

__getslice__(self, i, j)
Do a range search using the OOBTree

evaluate(self, expression)
Evaluate the expression and return all values in this object where the keys match the expression

rexsearch(self, pattern)
Do a regular expression search based on the pattern

read_disk(self, key, ttime)

commit(self, current_tid, ttime, transaction_data)

update_index(self, index_entries)

update_rcache(self, ttime, transaction_data)

stats(self)
Return useful statistics on the store.

Inherited from ioengine.PersistenceEngine: __repr__, clean_index, close, create, create_snapshot, flush_index, get, get_options, get_r_fp, is_snaphot, mark_index_inconsistent, read, read_header, rollback, upgrade, validate_transaction

Inherited from object: __delattr__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __setattr__, __str__

Class Variables
Inherited from `ioengine.PersistenceEngine`: `r_fp`

Properties
Inherited from `object`: `__class__`

Method Details

init(self, fn, options)
(Constructor)

x.__init__(...) initializes x; see x.__class__.__doc__ for signature

Overrides: object.__init__: (inherited documentation)

has_key(self, key)

Do existence checking in indexocean server. MMAP is one of the most commonly searched stores Doing a search on IndexedSubstringDict is O(m) and in-memory compared to O(log(n)) for doing a search on DiskIndex (index).