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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* ola-latency.cpp
* Call FetchDmx and track the latency for each call.
* Copyright (C) 2005 Simon Newton
*/
#include <stdlib.h>
#include <ola/Callback.h>
#include <ola/Clock.h>
#include <ola/DmxBuffer.h>
#include <ola/Logging.h>
#include <ola/OlaClientWrapper.h>
#include <ola/base/Flags.h>
#include <ola/base/Init.h>
#include <ola/thread/SignalThread.h>
#include <iostream>
#include <string>
using ola::DmxBuffer;
using ola::NewSingleCallback;
using ola::OlaCallbackClientWrapper;
using ola::TimeStamp;
using ola::TimeInterval;
using std::cout;
using std::endl;
using std::string;
DEFINE_s_uint32(universe, u, 1, "The universe to receive data for");
DEFINE_default_bool(send_dmx, false, "Use SendDmx messages, default is GetDmx");
DEFINE_s_uint32(count, c, 0,
"Exit after this many RPCs, default: infinite (0)");
class Tracker {
public:
Tracker()
: m_count(0),
m_sum(0) {
m_buffer.Blackout();
}
bool Setup();
void Start();
void GotDmx(const DmxBuffer &data, const string &error);
void SendComplete(const string &error);
private:
uint32_t m_count;
uint64_t m_sum;
TimeInterval m_max;
ola::DmxBuffer m_buffer;
OlaCallbackClientWrapper m_wrapper;
ola::Clock m_clock;
ola::thread::SignalThread m_signal_thread;
TimeStamp m_send_time;
void SendRequest();
void LogTime();
void StartSignalThread();
};
bool Tracker::Setup() {
return m_wrapper.Setup();
}
void Tracker::Start() {
ola::io::SelectServer *ss = m_wrapper.GetSelectServer();
m_signal_thread.InstallSignalHandler(
SIGINT,
ola::NewCallback(ss, &ola::io::SelectServer::Terminate));
m_signal_thread.InstallSignalHandler(
SIGTERM,
ola::NewCallback(ss, &ola::io::SelectServer::Terminate));
SendRequest();
ss->Execute(ola::NewSingleCallback(this, &Tracker::StartSignalThread));
ss->Run();
// Print this via cout to ensure we actually get some output by default
// It also means you can just see the stats and not each individual request
// if you want.
cout << "--------------" << endl;
cout << "Sent " << m_count << " RPCs" << endl;
cout << "Max was " << m_max.MicroSeconds() << " microseconds" << endl;
cout << "Mean " << m_sum / m_count << " microseconds" << endl;
}
void Tracker::GotDmx(const DmxBuffer &, const string &) {
LogTime();
}
void Tracker::SendComplete(const string &) {
LogTime();
}
void Tracker::SendRequest() {
m_clock.CurrentMonotonicTime(&m_send_time);
if (FLAGS_send_dmx) {
m_wrapper.GetClient()->SendDmx(
FLAGS_universe,
m_buffer,
NewSingleCallback(this, &Tracker::SendComplete));
} else {
m_wrapper.GetClient()->FetchDmx(
FLAGS_universe,
NewSingleCallback(this, &Tracker::GotDmx));
}
}
void Tracker::LogTime() {
TimeStamp now;
m_clock.CurrentMonotonicTime(&now);
TimeInterval delta = now - m_send_time;
if (delta > m_max) {
m_max = delta;
}
m_sum += delta.MicroSeconds();
OLA_INFO << "RPC took " << delta;
if (FLAGS_count == ++m_count) {
m_wrapper.GetSelectServer()->Terminate();
} else {
SendRequest();
}
}
void Tracker::StartSignalThread() {
if (!m_signal_thread.Start()) {
m_wrapper.GetSelectServer()->Terminate();
}
}
int main(int argc, char *argv[]) {
ola::AppInit(&argc, argv, "[options]",
"Measure the latency of RPCs to olad.");
Tracker tracker;
if (!tracker.Setup()) {
OLA_FATAL << "Setup failed";
exit(1);
}
tracker.Start();
return 0;
}
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