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#ifndef QPID_BROKER_RATETRACKER_H
#define QPID_BROKER_RATETRACKER_H
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include "qpid/sys/Time.h"
namespace qpid {
namespace broker {
/**
* Simple rate tracker: represents some value that can be incremented,
* then can periodcially sample the rate of increments.
*/
class RateTracker
{
public:
RateTracker();
/**
* Increments the count being tracked. Can be called concurrently
* with other calls to this operator as well as with calls to
* sampleRatePerSecond().
*/
RateTracker& operator++();
/**
* Returns the rate of increments per second since last
* called. Calls to this method should be serialised, but can be
* called concurrently with the increment operator
*/
double sampleRatePerSecond();
private:
volatile int32_t currentCount;
int32_t lastCount;
qpid::sys::AbsTime lastTime;
};
}} // namespace qpid::broker
#endif /*!QPID_BROKER_RATETRACKER_H*/
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