Delete obsolete CachePlugins

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@27345 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/CachePlugins/ZODBCache.py

-# -*- coding: utf-8 -*-
-##############################################################################
-#
-# Copyright (c) 2009 Nexedi SA and Contributors. All Rights Reserved.
-#                     Nicolas Delaby <nicolas@nexedi.com>
-#
-# WARNING: This program as such is intended to be used by professional
-# programmers who take the whole responsability of assessing all potential
-# consequences resulting from its eventual inadequacies and bugs
-# End users who are looking for a ready-to-use solution with commercial
-# garantees and support are strongly adviced to contract a Free Software
-# Service Company
-#
-# 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 2
-# 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, write to the Free Software
-# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
-#
-##############################################################################
-
-"""
-ZODB Based cache plugin.
-"""
-import time
-from BaseCache import BaseCache, CacheEntry
-from BTrees.OOBTree import OOBTree
-from Products.ERP5Type import interfaces
-import zope.interface
-
-PRIVATE_ATTRIBUTE_ZODB_CACHE_NAME = '_zodb_cache'
-
-class ZODBCache(BaseCache):
-  """ ZODB based cache plugin."""
-
-  zope.interface.implements(
-        interfaces.ICachePlugin
-    )
-
-  cache_tool = None
-  cache_expire_check_interval = 300
-
-  def __init__(self, params={}):
-    BaseCache.__init__(self)
-    self.cache_tool = params.get('cache_tool')
-
-  def initCacheStorage(self):
-    """Init cache storage
-    Btree is enough for less than 1 Million entries.
-    For higher scalability, wee need to implement cache with hierarchical Btree
-    with clever key generator
-    """
-    if getattr(self.cache_tool, PRIVATE_ATTRIBUTE_ZODB_CACHE_NAME, None) is None:
-      self.cache_tool._zodb_cache = OOBTree()
-
-  def getCacheStorage(self, **kw):
-    return getattr(self.cache_tool, PRIVATE_ATTRIBUTE_ZODB_CACHE_NAME)
-
-  def get(self, cache_id, scope, default=None):
-    cache = self.getCacheStorage()
-    try:
-      cache_entry = cache[(scope, cache_id)]
-      # Note: tracking down cache hit could be achieved by uncommenting
-      # methods below. In production environment this is likely uneeded
-      #cache_entry.markCacheHit()
-      #self.markCacheHit()
-      return cache_entry
-    except KeyError:
-      pass
-    return default
-
-  def set(self, cache_id, scope, value, cache_duration=None, calculation_time=0):
-    cache = self.getCacheStorage()
-    cache[(scope, cache_id)] = CacheEntry(value, cache_duration, calculation_time)
-    #self.markCacheMiss()
-
-  def expireOldCacheEntries(self, forceCheck = False):
-    now = time.time()
-    if forceCheck or (now > self._next_cache_expire_check_at):
-      ## time to check for expired cache items
-      self._next_cache_expire_check_at = now + self.cache_expire_check_interval
-      cache = self.getCacheStorage()
-      for key, value in cache.items():
-        if value.isExpired():
-          try:
-            del cache[key]
-          except KeyError:
-            # The key might have disappeared, due to multi-threading.
-            pass
-
-  def delete(self, cache_id, scope):
-    try:
-      del self.getCacheStorage()[(scope, cache_id)]
-    except KeyError:
-      pass
-
-  def has_key(self, cache_id, scope):
-    cache = self.getCacheStorage()
-    return cache.has_key((scope, cache_id))
-
-  def getScopeList(self):
-    scope_set = set()
-    for scope, cache_id in self.getCacheStorage().iterkeys():
-      scope_set.add(scope)
-    return list(scope_set)
-
-  def getScopeKeyList(self, scope):
-    key_list = []
-    for key in self.getCacheStorage().iterkeys():
-      if scope == key[0]:
-        key_list.append(key[1])
-    return key_list
-
-  def clearCache(self):
-    BaseCache.clearCache(self)
-    self.getCacheStorage().clear()
-
-  def clearCacheForScope(self, scope):
-    cache = self.getCacheStorage()
-    for key in cache.keys():
-      if key[0] == scope:
-        try:
-          del cache[key]
-        except KeyError:
-          # The key might have disappeared, due to multi-threading.
-          pass
-
-  def getCachePluginTotalMemorySize(self):
-    """Not Implemented"""
-    return 0