Examples of io.airlift.testing.TestingTicker

io.airlift.testing.TestingTicker


    @Test
    public void testExceptionFromResponseHandler()
            throws Exception
    {
        final TestingTicker ticker = new TestingTicker();
        final AtomicReference<Duration> tickerIncrement = new AtomicReference<>(new Duration(0, TimeUnit.SECONDS));


        Function<Request, Response> processor = new Function<Request, Response>()
        {
            @Override
            public Response apply(Request input)
            {
                Duration delta = tickerIncrement.get();
                ticker.increment(delta.toMillis(), TimeUnit.MILLISECONDS);
                throw new RuntimeException("Foo");
            }
        };


        CyclicBarrier requestComplete = new CyclicBarrier(2);

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    @Test
    public void testExceptionFromResponseHandler()
            throws Exception
    {
        final TestingTicker ticker = new TestingTicker();
        final AtomicReference<Duration> tickerIncrement = new AtomicReference<>(new Duration(0, TimeUnit.SECONDS));


        Function<Request, Response> processor = new Function<Request, Response>()
        {
            @Override
            public Response apply(Request input)
            {
                Duration delta = tickerIncrement.get();
                ticker.increment(delta.toMillis(), TimeUnit.MILLISECONDS);
                throw new RuntimeException("Foo");
            }
        };


        CyclicBarrier requestComplete = new CyclicBarrier(2);

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    @Test
    public void testExceptionFromResponseHandler()
            throws Exception
    {
        final TestingTicker ticker = new TestingTicker();
        final AtomicReference<Duration> tickerIncrement = new AtomicReference<>(new Duration(0, TimeUnit.SECONDS));


        Function<Request, Response> processor = new Function<Request, Response>()
        {
            @Override
            public Response apply(Request input)
            {
                Duration delta = tickerIncrement.get();
                ticker.increment(delta.toMillis(), TimeUnit.MILLISECONDS);
                throw new RuntimeException("Foo");
            }
        };


        CyclicBarrier requestComplete = new CyclicBarrier(2);

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public class TestDecayCounter
{
    @Test
    public void testCountDecays()
    {
        TestingTicker ticker = new TestingTicker();


        DecayCounter counter = new DecayCounter(ExponentialDecay.oneMinute(), ticker);
        counter.add(1);
        ticker.increment(1, TimeUnit.MINUTES);


        assertTrue(Math.abs(counter.getCount() - 1 / Math.E) < 1e-9);
    }

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    }


    @Test
    public void testAddAfterRescale()
    {
        TestingTicker ticker = new TestingTicker();


        DecayCounter counter = new DecayCounter(ExponentialDecay.oneMinute(), ticker);
        counter.add(1);
        ticker.increment(1, TimeUnit.MINUTES);
        counter.add(2);


        double expected = 2 + 1 / Math.E;
        assertTrue(Math.abs(counter.getCount() - expected) < 1e-9);
    }

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    private TestingTicker ticker;


    @BeforeMethod
    public void setup()
    {
        ticker = new TestingTicker();
    }

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    @Test
    public void testBasicCompression()
    {
        // maxError = 0.8 so that we get compression factor = 5 with the data below
        QuantileDigest digest = new QuantileDigest(0.8, 0, new TestingTicker(), false);


        List<Integer> values = asList(0, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 5, 6, 7);
        addAll(digest, values);


        digest.compress();

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    @Test
    public void testCompression()
            throws Exception
    {
        QuantileDigest digest = new QuantileDigest(1, 0, new TestingTicker(), false);


        for (int loop = 0; loop < 2; ++loop) {
            addRange(digest, 0, 15);


            digest.compress();

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    @Test
    public void testDecayedQuantiles()
            throws Exception
    {
        TestingTicker ticker = new TestingTicker();
        QuantileDigest digest = new QuantileDigest(1, ExponentialDecay.computeAlpha(0.5, 60), ticker, true);


        addAll(digest, asList(0, 1, 2, 3, 4, 5, 6, 7, 8, 9));


        // should have no compressions with so few values and the allowed error
        assertEquals(digest.getCompressions(), 0);
        assertEquals(digest.getConfidenceFactor(), 0.0);


        ticker.increment(60, TimeUnit.SECONDS);
        addAll(digest, asList(10, 11, 12, 13, 14, 15, 16, 17, 18, 19));


        // Considering that the first 10 values now have a weight of 0.5 per the alpha factor, they only contributed a count
        // of 5 to rank computations. Therefore, the 50th percentile is equivalent to a weighted rank of (5 + 10) / 2 = 7.5,
        // which corresponds to value 12

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    @Test
    public void testDecayedCounts()
            throws Exception
    {
        TestingTicker ticker = new TestingTicker();
        QuantileDigest digest = new QuantileDigest(1, ExponentialDecay.computeAlpha(0.5, 60), ticker, true);


        addAll(digest, asList(0, 1, 2, 3, 4, 5, 6, 7, 8, 9));


        // should have no compressions with so few values and the allowed error
        assertEquals(digest.getCompressions(), 0);
        assertEquals(digest.getConfidenceFactor(), 0.0);


        ticker.increment(60, TimeUnit.SECONDS);
        addAll(digest, asList(10, 11, 12, 13, 14, 15, 16, 17, 18, 19));


        // The first 10 values only contribute 5 to the counts per the alpha factor
        assertEquals(
                digest.getHistogram(asList(10L, 20L)),

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