/http_server/stack/counters/AWSAveragingCounter.cpp

 1/* Copyright (c) 2009 Yahoo! Inc.  All rights reserved.
 2 * The copyrights embodied in the content of this file are licensed by Yahoo! Inc.
 3 * under the BSD (revised) open source license.
 4 */
 5
 6#ifndef AWS_AVERAGING_COUNTER_H
 7#include <AWSAveragingCounter.h>
 8#endif
 9
10AWSAveragingCounter::AWSAveragingCounter() :
11    _value(0.0), _observations(0.0), _lock() {
12}
13
14AWSAveragingCounter::~AWSAveragingCounter() {
15}
16
17void AWSAveragingCounter::addValue(double value) {
18    _lock.writeAcquire();
19
20    _observations = _observations + 1.0;
21
22    _value = (value * (1.0 / _observations)) + (_value * ((_observations - 1.0) / _observations));
23
24    _lock.writeRelease();
25}
26