Examples with DarkClusterStrategy com.linkedin.darkcluster.api.DarkClusterStrategy used on opensource projects

Example 11 with DarkClusterStrategy

use of com.linkedin.darkcluster.api.DarkClusterStrategy in project rest.li by linkedin.

the class TestDarkClusterStrategyFactory method testNoChangeStrategyOnNotification.

@Test
public void testNoChangeStrategyOnNotification() {
    DarkClusterConfig darkClusterConfig1 = createRelativeTrafficMultiplierConfig(0.5f);
    DarkClusterConfig darkClusterConfig2 = createRelativeTrafficMultiplierConfig(1.0f);
    _clusterInfoProvider.addDarkClusterConfig(SOURCE_CLUSTER_NAME, DARK_CLUSTER_NAME, darkClusterConfig1);
    _clusterInfoProvider.notifyListenersClusterAdded(SOURCE_CLUSTER_NAME);
    DarkClusterStrategy strategy = _strategyFactory.get(DARK_CLUSTER_NAME);
    Assert.assertTrue(strategy instanceof RelativeTrafficMultiplierDarkClusterStrategy);
    Assert.assertEquals(((RelativeTrafficMultiplierDarkClusterStrategy) strategy).getMultiplier(), 0.5f, "expected 0.5f multiplier");
    // update Strategy, then simulating a notification on the dark cluster.
    _clusterInfoProvider.addDarkClusterConfig(SOURCE_CLUSTER_NAME, DARK_CLUSTER_NAME, darkClusterConfig2);
    _clusterInfoProvider.notifyListenersClusterAdded(DARK_CLUSTER_NAME);
    // Nothing should have been changed, since we should be ignoring dark cluster changes. (strategy-impacting changes are all captured
    // in the source cluster data)
    DarkClusterStrategy strategy2 = _strategyFactory.get(DARK_CLUSTER_NAME);
    Assert.assertTrue(strategy2 instanceof RelativeTrafficMultiplierDarkClusterStrategy);
    Assert.assertEquals(((RelativeTrafficMultiplierDarkClusterStrategy) strategy2).getMultiplier(), 0.5f, "expected 0.5f multiplier");
}

Example 12 with DarkClusterStrategy

use of com.linkedin.darkcluster.api.DarkClusterStrategy in project rest.li by linkedin.

the class TestDarkClusterStrategyFactory method testStrategyRaceCondition.

@Test
public void testStrategyRaceCondition() {
    int noopStrategyCount = 0;
    DarkClusterConfig darkClusterConfig1 = createRelativeTrafficMultiplierConfig(0.5f);
    _clusterInfoProvider.addDarkClusterConfig(SOURCE_CLUSTER_NAME, DARK_CLUSTER_NAME, darkClusterConfig1);
    _clusterInfoProvider.notifyListenersClusterAdded(SOURCE_CLUSTER_NAME);
    DarkClusterStrategy strategy = _strategyFactory.get(DARK_CLUSTER_NAME);
    Assert.assertTrue(strategy instanceof RelativeTrafficMultiplierDarkClusterStrategy);
    Assert.assertEquals(((RelativeTrafficMultiplierDarkClusterStrategy) strategy).getMultiplier(), 0.5f, "expected 0.5f multiplier");
    // this was registered after DarkClusterStrategyFactoryImpl registered it's clusterListener.
    _clusterInfoProvider.registerClusterListener(new DeletingClusterListener(_clusterInfoProvider));
    ScheduledExecutorService scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
    final CountDownLatch latch = new CountDownLatch(1);
    try {
        scheduledExecutorService.scheduleAtFixedRate(() -> {
            _clusterInfoProvider.notifyListenersClusterAdded(SOURCE_CLUSTER_NAME);
            latch.countDown();
        }, 0, 1, TimeUnit.MILLISECONDS);
        if (!latch.await(30, TimeUnit.SECONDS)) {
            fail("unable to execute task on executor");
        }
        for (int i = 0; i < 100000; i++) {
            strategy = _strategyFactory.get(DARK_CLUSTER_NAME);
            // verified that this will catch race conditions, saw it happen 9/100k times.
            Assert.assertNotNull(strategy, "null at iteration: " + i);
            if (strategy instanceof NoOpDarkClusterStrategy) {
                noopStrategyCount++;
            }
        }
        System.out.println("noopStrategyCount: " + noopStrategyCount);
    } catch (InterruptedException ie) {
        fail("got interrupted exception", ie);
    } finally {
        scheduledExecutorService.shutdown();
    }
}

Example 13 with DarkClusterStrategy

use of com.linkedin.darkcluster.api.DarkClusterStrategy in project rest.li by linkedin.

the class TestIdenticalTrafficMultiplierDarkClusterStrategy method testHandleRequest.

@Test(dataProvider = "getDarkClusters")
public void testHandleRequest(List<DarkClusterMetadata> darkClusterMetadataList, float expectedRandomNumber) {
    String sourceClusterName = "sourceCluster";
    DarkClusterDispatcher darkClusterDispatcher = new DefaultDarkClusterDispatcher(new MockClient(false));
    Random random = Mockito.mock(Random.class);
    Mockito.when(random.nextFloat()).thenReturn(expectedRandomNumber);
    List<IdenticalTrafficMultiplierDarkClusterStrategy> strategies = darkClusterMetadataList.stream().map(darkClusterMetadata -> {
        BaseDarkClusterDispatcherImpl baseDispatcher = new BaseDarkClusterDispatcherImpl(darkClusterMetadata._darkClusterName, darkClusterDispatcher, new DoNothingNotifier(), new CountingVerifierManager());
        MockClusterInfoProvider mockClusterInfoProvider = new MockClusterInfoProvider();
        mockClusterInfoProvider.putHttpsClusterCount(darkClusterMetadata._darkClusterName, 1);
        mockClusterInfoProvider.putHttpsClusterCount(sourceClusterName, 1);
        return new IdenticalTrafficMultiplierDarkClusterStrategy(sourceClusterName, darkClusterMetadata._darkClusterName, darkClusterMetadata._multiplier, baseDispatcher, new DoNothingNotifier(), mockClusterInfoProvider, random);
    }).collect(Collectors.toList());
    RestRequest dummyRestRequest = new RestRequestBuilder(URI.create("foo")).build();
    RestRequest dummyDarkRequest = new RestRequestBuilder(URI.create("darkfoo")).build();
    RequestContext dummyRequestContext = new RequestContext();
    IntStream.range(0, darkClusterMetadataList.size()).forEach(index -> {
        DarkClusterMetadata darkClusterMetadata = darkClusterMetadataList.get(index);
        DarkClusterStrategy strategy = strategies.get(index);
        boolean darkRequestSent = strategy.handleRequest(dummyRestRequest, dummyDarkRequest, dummyRequestContext);
        Assert.assertEquals(darkRequestSent, darkClusterMetadata._darkRequestSent);
    });
    Assert.assertEquals(dummyRequestContext.getLocalAttr("identicalTrafficMultiplier.randomNumber"), expectedRandomNumber);
    Mockito.verify(random).nextFloat();
}