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# Copyright 2010, 2011 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import larch
class NodeStoreMemory(larch.NodeStore):
'''An implementation of larch.NodeStore API for in-memory storage.
All nodes are kept in memory. This is for demonstration and testing
purposes only.
'''
def __init__(self, node_size, codec):
larch.NodeStore.__init__(self, node_size, codec)
self.nodes = dict()
self.refcounts = dict()
self.metadata = dict()
def get_metadata_keys(self):
return self.metadata.keys()
def get_metadata(self, key):
return self.metadata[key]
def set_metadata(self, key, value):
self.metadata[key] = value
def remove_metadata(self, key):
del self.metadata[key]
def put_node(self, node):
node.frozen = True
self.nodes[node.id] = node
def get_node(self, node_id):
if node_id in self.nodes:
return self.nodes[node_id]
else:
raise larch.NodeMissing(repr(self), node_id)
def start_modification(self, node):
node.frozen = False
def remove_node(self, node_id):
if node_id in self.nodes:
del self.nodes[node_id]
else:
raise larch.NodeMissing(repr(self), node_id)
def list_nodes(self):
return self.nodes.keys()
def get_refcount(self, node_id):
return self.refcounts.get(node_id, 0)
def set_refcount(self, node_id, refcount):
self.refcounts[node_id] = refcount
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