class Collection(object):
'''Implements a simple persistent collection of objects.
It uses symlink and directory datastores to keep track of the items.
'''
Model = Model
def __init__(self, key, datastore, Model=None):
self.key = key
self.datastore = datastore
self.symlink_datastore = SymlinkDatastore(datastore)
self.directory_datastore = DirectoryDatastore(self.symlink_datastore)
@property
def keys(self):
return self.directory_datastore.directoryRead(self.key)
@property
def instances(self):
instances_data = self.instance_data_generator()
for data in instances_data:
yield self.Model.withData(data)
def add(self, instance_key):
if not isinstance(instance_key, Key):
instance_key = instance_key.key
collection_instance_key = self.key.instance(instance_key.name)
# add symlink
if instance_key != collection_instance_key:
self.symlink_datastore.link(instance_key, collection_instance_key)
# add to collection
self.directory_datastore.directoryAdd(self.key,
collection_instance_key)
def remove(self, instance_key):
if not isinstance(instance_key, Key):
instance_key = instance_key.key
collection_instance_key = self.key.instance(instance_key.name)
# remove symlink/delete entry
self.symlink_datastore.delete(collection_instance_key)
# remove from collection list
self.directory_datastore.directoryRemove(self.key,
collection_instance_key)
def instance_data_generator(self):
'''
Generator that returns all the data of all the instances.
(Can override this to parallelize the access).
'''
for key in self.keys:
yield self.directory_datastore.get(key)
class Collection(object):
'''Implements a simple persistent collection of objects.
It uses symlink and directory datastores to keep track of the items.
'''
Model = Model
def __init__(self, key, datastore, Model=None):
self.key = key
self.datastore = datastore
self.symlink_datastore = SymlinkDatastore(datastore)
self.directory_datastore = DirectoryDatastore(self.symlink_datastore)
@property
def keys(self):
return self.directory_datastore.directoryRead(self.key)
@property
def instances(self):
instances_data = self.instance_data_generator()
for data in instances_data:
yield self.Model.withData(data)
def add(self, instance_key):
if not isinstance(instance_key, Key):
instance_key = instance_key.key
collection_instance_key = self.key.instance(instance_key.name)
# add symlink
if instance_key != collection_instance_key:
self.symlink_datastore.link(instance_key, collection_instance_key)
# add to collection
self.directory_datastore.directoryAdd(self.key, collection_instance_key)
def remove(self, instance_key):
if not isinstance(instance_key, Key):
instance_key = instance_key.key
collection_instance_key = self.key.instance(instance_key.name)
# remove symlink/delete entry
self.symlink_datastore.delete(collection_instance_key)
# remove from collection list
self.directory_datastore.directoryRemove(self.key, collection_instance_key)
def instance_data_generator(self):
'''
Generator that returns all the data of all the instances.
(Can override this to parallelize the access).
'''
for key in self.keys:
yield self.directory_datastore.get(key)
def __init__(self, key, datastore, Model=None): self.key = key self.datastore = datastore self.symlink_datastore = SymlinkDatastore(datastore) self.directory_datastore = DirectoryDatastore(self.symlink_datastore)
def __init__(self, key, datastore, Model=None):
self.key = key
self.datastore = datastore
self.symlink_datastore = SymlinkDatastore(datastore)
self.directory_datastore = DirectoryDatastore(self.symlink_datastore)
