38a54df863
People keep tripping over the old copyrights and copy-pasting them to new files. Search and replace "Cloudius Systems" with "ScyllaDB". Message-Id: <1460013664-25966-1-git-send-email-penberg@scylladb.com>
86 lines
2.2 KiB
C++
86 lines
2.2 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Modified by ScyllaDB
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* Copyright (C) 2015 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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namespace utils {
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#include <deque>
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/**
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* bounded threadsafe deque
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*/
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class bounded_stats_deque {
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private:
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std::deque<long> _deque;
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long _sum = 0;
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int _max_size;
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public:
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bounded_stats_deque(int size)
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: _max_size(size) {
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}
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int size() {
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return _deque.size();
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}
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void add(long i) {
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if (size() >= _max_size) {
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auto removed = _deque.front();
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_deque.pop_front();
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_sum -= removed;
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}
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_deque.push_back(i);
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_sum += i;
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}
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long sum() {
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return _sum;
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}
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double mean() {
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return size() > 0 ? ((double) sum()) / size() : 0;
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}
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const std::deque<long>& deque() const {
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return _deque;
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}
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};
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}
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