############################################################################## # # Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved. # Copyright (c) 2002 Nexedi SARL and Contributors. All Rights Reserved. # Jean-Paul Smets-Solanes <jp@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 software is subject to the provisions of the Zope Public License, # Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution. # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS # FOR A PARTICULAR PURPOSE # # # Based on: db.py in ZMySQLDA # ############################################################################## from Shared.DC.ZRDB.TM import TM from zLOG import LOG, ERROR, INFO class ActivityBuffer(TM): _p_oid=_p_changed=_registered=None def __init__(self): from thread import allocate_lock self._use_TM = self._transactions = 1 if self._use_TM: self._tlock = allocate_lock() self._tthread = None self._lock = allocate_lock() # Keeps a list of messages to add and remove # at end of transaction def _begin(self, *ignored): from thread import get_ident self._tlock.acquire() self._tthread = get_ident() self.requires_prepare = 1 try: LOG("_begin", 0, '') self.queued_activity = [] self.flushed_activity = [] except: LOG('ActivityBuffer', ERROR, "exception during _begin", error=sys.exc_info()) self._tlock.release() raise def _finish(self, *ignored): from thread import get_ident if not self._tlock.locked() or self._tthread != get_ident(): LOG('ActivityBuffer', INFO, "ignoring _finish") return try: try: # Try to push / delete all messages for (activity, activity_tool, message) in self.flushed_activity: activity.finishDeleteMessage(activity_tool, message) for (activity, activity_tool, message) in self.queued_activity: activity.finishQueueMessage(activity_tool, message) except: LOG('ActivityBuffer', ERROR, "exception during _finish", error=sys.exc_info()) raise finally: self._tlock.release() def _abort(self, *ignored): from thread import get_ident if not self._tlock.locked() or self._tthread != get_ident(): LOG('ActivityBuffer', 0, "ignoring _abort") return self._tlock.release() def tpc_prepare(self, *ignored): if not self.requires_prepare: return self.requires_prepare = 0 from thread import get_ident if not self._tlock.locked() or self._tthread != get_ident(): LOG('ActivityBuffer', 0, "ignoring tpc_prepare") return try: # Try to push / delete all messages for (activity, activity_tool, message) in self.flushed_activity: activity.prepareDeleteMessage(activity_tool, message) for (activity, activity_tool, message) in self.queued_activity: activity.prepareQueueMessage(activity_tool, message) except: LOG('ActivityBuffer', ERROR, "exception during tpc_prepare", error=sys.exc_info()) raise def deferredQueueMessage(self, activity_tool, activity, message): self._register() LOG("deferredQueueMessage", 0, '') self.queued_activity.append((activity, activity_tool, message)) def deferredDeleteMessage(self, activity_tool, activity, message): self._register() LOG("deferredDeleteMessage", 0, '') self.flushed_activity.append((activity, activity_tool, message))