@Test
public void testManyUpdatesInRapidSuccession() throws Exception {
createJmxCollector("Uptime", JmxCollector.COUNTER_DATA_SOURCE_TYPE, 1);
// Set high update delta time so that samples will be skipped
jmxCollector.setMinimumUpdateTimeDelta(3);
// Sleep long enough for some data to be collected
long numRrdSamples = 4;
Thread.sleep(numRrdSamples * 1000);
// Expected skip count is 2 because first sample is always accepted and
// num samples is one more than minimum update time delta
long expectedSampleSkipCount = numRrdSamples - 2;
assertThat(jmxCollector.getSampleSkipCount(), is(expectedSampleSkipCount));
}
/** *************************************************************************************** */
private void createJmxCollector(String mbeanAttributeName, String dataSourceType, int sampleRate)
throws Exception {
dataSourceName = mbeanAttributeName.toLowerCase();
rrdPath = dataSourceName + ".rrd";
jmxCollector = new JmxCollector();
jmxCollector.setMbeanName("java.lang:type=Runtime");
jmxCollector.setMbeanAttributeName(mbeanAttributeName);
jmxCollector.setRrdPath(rrdPath);
jmxCollector.setRrdDataSourceName(dataSourceName);
jmxCollector.setRrdDataSourceType(dataSourceType);
jmxCollector.setSampleRate(sampleRate);
jmxCollector.setMinimumUpdateTimeDelta(0);
jmxCollector.setMetricsDir(TEST_DIR);
// Simulates what Spring beans container would do
jmxCollector.configureCollector();
}
