@Test(groups = "fast")
public void testBasicFilterOperations() throws Exception {
final List<Double> outputs = new ArrayList<Double>();
final long millisStart = System.currentTimeMillis() - 2000 * 100;
final DecimatingSampleFilter filter =
new DecimatingSampleFilter(
new DateTime(millisStart),
new DateTime(millisStart + 2000 * 100),
25,
100,
new TimeSpan("2s"),
DecimationMode.PEAK_PICK,
new SampleConsumer() {
@Override
public void consumeSample(
int sampleNumber, SampleOpcode opcode, Object value, DateTime time) {
outputs.add((double) ((Double) value));
}
});
for (int i = 0; i < 100; i++) {
// Make the value go up for 4 samples; then down for 4 samples, between 10.0 and 40.0
final int index = (i % 8) + 1;
double value = 0;
if (index <= 4) {
value = 10.0 * index;
} else {
value = (8 - (index - 1)) * 10;
}
// System.out.printf("For i %d, index %d, adding value %f\n", i, index, value);
filter.processOneSample(new DateTime(millisStart + 2000 * i), SampleOpcode.DOUBLE, value);
}
int index = 0;
for (Double value : outputs) {
// System.out.printf("index %d, value %f\n", index++, (double)((Double)value));
if ((index & 1) == 0) {
Assert.assertEquals(value, 40.0);
} else {
Assert.assertEquals(value, 10.0);
}
index++;
}
}
/**
* This test has sample count of 21, and output count of 6, so there are 5.8 samples per output
* point
*
* @throws Exception
*/
@Test(groups = "fast")
public void testFilterWithNonAlignedSampleCounts() throws Exception {
final List<Double> outputs = new ArrayList<Double>();
final long millisStart = System.currentTimeMillis() - 2000 * 21;
final DecimatingSampleFilter filter =
new DecimatingSampleFilter(
new DateTime(millisStart),
new DateTime(millisStart + 2000 * 21),
6,
21,
new TimeSpan("2s"),
DecimationMode.PEAK_PICK,
new SampleConsumer() {
@Override
public void consumeSample(
int sampleNumber, SampleOpcode opcode, Object value, DateTime time) {
outputs.add((double) ((Double) value));
}
});
for (int i = 0; i < 21; i++) {
// Make the value go up for 6 samples; then down for 6 samples, between 10.0 and 60.0
final int index = (i % 6) + 1;
double value = 0;
if (index <= 3) {
value = 10.0 * index;
} else {
value = (6 - (index - 1)) * 10;
}
// System.out.printf("For i %d, index %d, adding value %f\n", i, index, value);
filter.processOneSample(new DateTime(millisStart + 2000 * i), SampleOpcode.DOUBLE, value);
}
Assert.assertEquals(outputs.size(), 5);
final double[] expectedValues = new double[] {30.0, 20.0, 30.0, 30.0, 10.0};
for (int i = 0; i < 5; i++) {
final double value = outputs.get(i);
final double expectedValue = expectedValues[i];
// System.out.printf("index %d, value returned %f, value expected %f\n", i, value,
// expectedValue);
Assert.assertEquals(value, expectedValue);
}
}