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#ifndef QPID_SYS_TIMERWARNINGS_H
#define QPID_SYS_TIMERWARNINGS_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"
#include <map>
#include <string>
namespace qpid {
namespace sys {
/**
* The Timer class logs warnings when timer tasks are late and/or overrun.
*
* It is too expensive to log a warning for every late/overrun
* incident, doing so aggravates the problem of tasks over-running and
* being late.
*
* This class collects statistical data about each incident and prints
* an aggregated report at regular intervals.
*/
class TimerWarnings
{
public:
TimerWarnings(Duration reportInterval);
void late(const std::string& task, Duration delay);
void overran(const std::string& task, Duration overrun, Duration time);
void lateAndOverran(const std::string& task,
Duration delay, Duration overrun, Duration time);
private:
struct Statistic {
Statistic() : total(0), count(0) {}
void add(int64_t value) { total += value; ++count; }
int64_t average() const { return count ? total/count : 0; }
int64_t total;
int64_t count;
};
// Keep statistics for 3 classes of incident: late, overrun and both.
struct TaskStats {
Statistic lateDelay; // Just late
Statistic overranOverrun, overranTime; // Just overrun
// Both
Statistic lateAndOverranDelay, lateAndOverranOverrun, lateAndOverranTime;
};
typedef std::map<std::string, TaskStats> TaskStatsMap;
void log();
Duration interval;
AbsTime nextReport;
TaskStatsMap taskStats;
};
}} // namespace qpid::sys
#endif /*!QPID_SYS_TIMERWARNINGS_H*/
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