Package bw :: Package poseidon :: Module ioengine :: Class PersistenceEngine

Class PersistenceEngine

object --+
         |
        PersistenceEngine

Abstract class for ocean/sea object

Instance Methods

get_r_fp(self)

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

__repr__(self)
repr(x)

get(self, key, failobj=None)

has_key(self, key)

close(self)

commit(self, current_tid, ttime, transaction_data)

create(self)
Create the data-file

flush_index(self)

get_options(self)
Returns the current options in use.

load_index(self)

load_cache(self)

mark_index_inconsistent(self, tf)

read(self, key, ttime)
Read the entry for ttime

read_disk(self, key, ttime)

read_header(self)

recreate_index(self)
Read the datafile and create the index file

rollback(self, current_tid, ttime, old_tid, old_ttime)

validate_transaction(self, ttime, transaction_data)

clean_index(self)

is_snaphot(self, name)

create_snapshot(self, name=str(time.time()))
Create a snapshot with name [name].

stats(self)
Return useful statistics on the store.

upgrade(self, source_header, to_version)

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

Class Variables
	r_fp = `property(fget= get_r_fp, fset= None, fdel= None, doc= "")`

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)

repr(self)
(Representation operator)

repr(x)

Overrides: object.__repr__: (inherited documentation)

get_options(self)

Returns the current options in use. This is read-only

create_snapshot(self, name=str(time.time()))

Create a snapshot with name [name].

If name is None, the current timestamp is used

stats(self)

Return useful statistics on the store.

version
system endianness
storage engine
disk data size
index data size
created time
last modification
uptime (in seconds)
number of items
total reads operations
cache hits
total number of commits
tau
pack/flush/commit state