Implement frequency limiting class to be used for controlled messages-per-second ratio during send to syslog

test/FrequencyLimitTests.cpp

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+/*
+ The MIT License (MIT)
+
+Copyright (c) 2015 Marko Živanović
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+ */
+
+#define BOOST_TEST_MODULE FrequencyLimitTests
+#include <boost/test/unit_test.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include "../src/FrequencyLimit.h"
+
+using namespace boost::posix_time;
+
+size_t countInLoop(size_t freq, time_duration duration) {
+    FrequencyLimit f(freq);
+    ptime start(second_clock::local_time());
+    int c = 0;
+    while (second_clock::local_time() - start < duration) {
+        f.tick();
+        c++;
+    }
+    return c;
+}
+
+BOOST_AUTO_TEST_CASE(test_slow) {
+    size_t c = countInLoop(5, seconds(5));
+    BOOST_WARN_CLOSE((float) c, 25, 10);
+}
+
+BOOST_AUTO_TEST_CASE(test_fast) {
+    size_t c = countInLoop(100, seconds(5));
+    BOOST_WARN_CLOSE((float) c, 500, 10);
+}