/**
* Decrement a metric by name.
*
* @param name of the metric
* @param value of the snapshot to add
* @param factory to lazily create the metric if not null
*/
public void add(String name, long value, MetricMutableFactory factory) {
MetricMutable m = metricsMap.get(name);
if (m != null) {
if (m instanceof MetricMutableStat) {
((MetricMutableStat) m).add(value);
} else {
throw new MetricsException("Unsupported add(value) for metric " + name);
}
} else if (factory != null) {
metricsMap.put(name, factory.newStat(name));
add(name, value, null);
} else {
throw new MetricsException("Metric " + name + " doesn't exist");
}
}
/** Test the snapshot method */
@Test
public void testSnapshot() {
MetricsRecordBuilder mb = mock(MetricsRecordBuilder.class);
MetricMutableStat stat = new MetricMutableStat("s1", "stat", "ops", "time", true);
stat.add(0);
MetricMutableStat stat2 = new MetricMutableStat("s2", "stat", "ops", "time");
stat2.add(0);
List<MetricMutable> metrics =
Arrays.asList(
new MetricMutableCounterInt("c1", "int counter", 1),
new MetricMutableCounterLong("c2", "long counter", 2L),
new MetricMutableGaugeInt("g1", "int gauge", 3),
new MetricMutableGaugeLong("g2", "long gauge", 4L),
stat,
stat2);
for (MetricMutable metric : metrics) {
metric.snapshot(mb, true);
}
stat2.snapshot(mb, true); // should get the same back.
stat2.add(1);
stat2.snapshot(mb, true); // should get new interval values back
verify(mb).addCounter("c1", "int counter", 1);
verify(mb).addCounter("c2", "long counter", 2L);
verify(mb).addGauge("g1", "int gauge", 3);
verify(mb).addGauge("g2", "long gauge", 4L);
verify(mb).addCounter("s1_num_ops", "Number of ops for stat", 1L);
verify(mb).addGauge(eq("s1_avg_time"), eq("Average time for stat"), eq(0.0, EPSILON));
verify(mb)
.addGauge(eq("s1_stdev_time"), eq("Standard deviation of time for stat"), eq(0.0, EPSILON));
verify(mb).addGauge(eq("s1_imin_time"), eq("Interval min time for stat"), eq(0.0, EPSILON));
verify(mb).addGauge(eq("s1_imax_time"), eq("Interval max time for stat"), eq(0.0, EPSILON));
verify(mb).addGauge(eq("s1_min_time"), eq("Min time for stat"), eq(0.0, EPSILON));
verify(mb).addGauge(eq("s1_max_time"), eq("Max time for stat"), eq(0.0, EPSILON));
verify(mb, times(2)).addCounter("s2_num_ops", "Number of ops for stat", 1L);
verify(mb, times(2)).addGauge(eq("s2_avg_time"), eq("Average time for stat"), eq(0.0, EPSILON));
verify(mb).addCounter("s2_num_ops", "Number of ops for stat", 2L);
verify(mb).addGauge(eq("s2_avg_time"), eq("Average time for stat"), eq(1.0, EPSILON));
}