CodernityDB python 3

libs/CodernityDB3/sharded_index.py

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+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright 2011-2013 Codernity (http://codernity.com)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+from CodernityDB3.index import Index
+# from CodernityDB3.env import cdb_environment
+# import warnings
+
+
+class ShardedIndex(Index):
+
+    def __init__(self, db_path, name, *args, **kwargs):
+        """
+        There are 3 additional parameters. You have to hardcode them in your custom class. **NEVER** use directly
+
+        :param int sh_nums: how many shards should be
+        :param class ind_class: Index class to use (HashIndex or your custom one)
+        :param bool use_make_keys: if True, `make_key`, and `make_key_value` will be overriden with those from first shard
+
+        The rest parameters are passed straight to `ind_class` shards.
+
+        """
+        super(ShardedIndex, self).__init__(db_path, name)
+        try:
+            self.sh_nums = kwargs.pop('sh_nums')
+        except KeyError:
+            self.sh_nums = 5
+        try:
+            ind_class = kwargs.pop('ind_class')
+        except KeyError:
+            raise Exception("ind_class must be given")
+        else:
+            # if not isinstance(ind_class, basestring):
+            #     ind_class = ind_class.__name__
+            self.ind_class = ind_class
+        if 'use_make_keys' in kwargs:
+            self.use_make_keys = kwargs.pop('use_make_keys')
+        else:
+            self.use_make_keys = False
+        self._set_shard_datas(*args, **kwargs)
+        self.patchers = []  # database object patchers
+
+    def _set_shard_datas(self, *args, **kwargs):
+        self.shards = {}
+        self.shards_r = {}
+#        ind_class = globals()[self.ind_class]
+        ind_class = self.ind_class
+        i = 0
+        for sh_name in [self.name + str(x) for x in range(self.sh_nums)]:
+            # dict is better than list in that case
+            self.shards[i] = ind_class(self.db_path, sh_name, *args, **kwargs)
+            self.shards_r['%02x' % i] = self.shards[i]
+            self.shards_r[i] = self.shards[i]
+            i += 1
+
+        if not self.use_make_keys:
+            self.make_key = self.shards[0].make_key
+            self.make_key_value = self.shards[0].make_key_value
+
+        self.last_used = 0
+
+    @property
+    def storage(self):
+        st = self.shards[self.last_used].storage
+        return st
+
+    def __getattr__(self, name):
+        return getattr(self.shards[self.last_used], name)
+
+    def open_index(self):
+        for curr in self.shards.values():
+            curr.open_index()
+
+    def create_index(self):
+        for curr in self.shards.values():
+            curr.create_index()
+
+    def destroy(self):
+        for curr in self.shards.values():
+            curr.destroy()
+
+    def compact(self):
+        for curr in self.shards.values():
+            curr.compact()
+
+    def reindex(self):
+        for curr in self.shards.values():
+            curr.reindex()
+
+    def all(self, *args, **kwargs):
+        for curr in self.shards.values():
+            for now in curr.all(*args, **kwargs):
+                yield now
+
+    def get_many(self, *args, **kwargs):
+        for curr in self.shards.values():
+            for now in curr.get_many(*args, **kwargs):
+                yield now