From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id DBA4FA0507; Wed, 6 Apr 2022 16:58:09 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 84EE9428B0; Wed, 6 Apr 2022 16:56:35 +0200 (CEST) Received: from lb.pantheon.sk (lb.pantheon.sk [46.229.239.20]) by mails.dpdk.org (Postfix) with ESMTP id 5C1E942892 for ; Wed, 6 Apr 2022 16:56:31 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by lb.pantheon.sk (Postfix) with ESMTP id A81C01B1F79; Wed, 6 Apr 2022 16:56:30 +0200 (CEST) X-Virus-Scanned: amavisd-new at siecit.sk Received: from lb.pantheon.sk ([127.0.0.1]) by localhost (lb.pantheon.sk [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id r6G9RXMwLqUF; Wed, 6 Apr 2022 16:56:29 +0200 (CEST) Received: from entguard.lab.pantheon.local (unknown [46.229.239.141]) by lb.pantheon.sk (Postfix) with ESMTP id BC7F71B1F7F; Wed, 6 Apr 2022 16:56:12 +0200 (CEST) From: =?UTF-8?q?Juraj=20Linke=C5=A1?= To: thomas@monjalon.net, david.marchand@redhat.com, Honnappa.Nagarahalli@arm.com, ohilyard@iol.unh.edu, lijuan.tu@intel.com Cc: dev@dpdk.org, =?UTF-8?q?Juraj=20Linke=C5=A1?= Subject: [RFC PATCH v1 12/15] dts: merge DTS framework/serializer.py to DPDK Date: Wed, 6 Apr 2022 14:56:03 +0000 Message-Id: <20220406145606.2913834-13-juraj.linkes@pantheon.tech> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220406145606.2913834-1-juraj.linkes@pantheon.tech> References: <20220406145606.2913834-1-juraj.linkes@pantheon.tech> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org --- dts/framework/serializer.py | 115 ++++++++++++++++++++++++++++++++++++ 1 file changed, 115 insertions(+) create mode 100644 dts/framework/serializer.py diff --git a/dts/framework/serializer.py b/dts/framework/serializer.py new file mode 100644 index 0000000000..0ffa16a592 --- /dev/null +++ b/dts/framework/serializer.py @@ -0,0 +1,115 @@ +# BSD LICENSE +# +# Copyright(c) 2010-2014 Intel Corporation. All rights reserved. +# All rights reserved. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions +# are met: +# +# * Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# * Redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in +# the documentation and/or other materials provided with the +# distribution. +# * Neither the name of Intel Corporation nor the names of its +# contributors may be used to endorse or promote products derived +# from this software without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +""" +Wrapper class for serializer module +""" +import os +import pickle + + +class Singleton(type): + _instances = {} + + def __call__(self, *args, **kwargs): + if self not in self._instances: + self._instances[self] = super(Singleton, self).__call__(*args, **kwargs) + return self._instances[self] + + +class Serializer(object): + + """ + Two-levels cache implementation for storing/retrieving any kind of object + using using a key-value model. It uses the pickle module to store objects + into a file. + This class implements the Singleton pattern. Everytime its constructor + is called it will return a reference to the same instance. + """ + + def __init__(self): + self.volatile_cache = {} + self.filename = "serializer.cache" + + def save(self, object_name, object_to_save): + """ + Saves an object into the volatile dictionary cache - which + resides in memory. + """ + self.volatile_cache[object_name] = object_to_save + + def load(self, object_name): + """ + Loads and returns an object from the volatile cache. + """ + return self.volatile_cache.get(object_name, None) + + def set_serialized_filename(self, filename): + """ + Sets the name of the non-volatile cache file to be used in the future + """ + self.filename = filename + + def save_to_file(self): + """ + Saves the volatile cache to a file (non-volatile) using the pickle + module. Returns True in case everything went OK, False otherwise. + """ + try: + serialized_file = open(self.filename, "w") + pickle.dump(self.volatile_cache, serialized_file) + serialized_file.close() + return True + except: + return False + + def load_from_file(self): + """ + Reads from a pickle-like file using pickle module and populates the + volatile cache. Returns True in case everything went OK, False + otherwise. + """ + try: + serialized_file = open(self.filename, "r") + self.volatile_cache = pickle.load(serialized_file) + serialized_file.close() + return True + except: + self.volatile_cache.clear() + return False + + def discard_cache(self): + """ + Discards both volatile and non-volatile cache. + """ + self.volatile_cache.clear() + if os.path.exists(self.filename): + os.remove(self.filename) -- 2.20.1