Java Code Examples for io.github.resilience4j.ratelimiter.RateLimiter#Metrics

The following examples show how to use io.github.resilience4j.ratelimiter.RateLimiter#Metrics . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: RateLimitersImplementationTest.java    From resilience4j with Apache License 2.0 6 votes vote down vote up 
protected void waitForRefresh(RateLimiter.Metrics metrics, RateLimiterConfig config,
                              char printedWhileWaiting) {
    Instant start = Instant.now();
    while (Instant.now().isBefore(start.plus(config.getLimitRefreshPeriod()))) {
        try {
            if (metrics.getAvailablePermissions() == config.getLimitForPeriod()) {
                break;
            }
            System.out.print(printedWhileWaiting);
            Thread.sleep(10);
        } catch (InterruptedException ex) {
            throw new IllegalStateException(ex);
        }
    }
    System.out.println();
}
Example 2
Source File: RateLimitersHealthIndicator.java    From resilience4j with Apache License 2.0 6 votes vote down vote up 
private Health mapRateLimiterHealth(RateLimiter rateLimiter) {
    RateLimiter.Metrics metrics = rateLimiter.getMetrics();
    int availablePermissions = metrics.getAvailablePermissions();
    int numberOfWaitingThreads = metrics.getNumberOfWaitingThreads();
    long timeoutInNanos = rateLimiter.getRateLimiterConfig().getTimeoutDuration().toNanos();

    if (availablePermissions > 0 || numberOfWaitingThreads == 0) {
        return rateLimiterHealth(Status.UP, availablePermissions, numberOfWaitingThreads);
    }

    if (rateLimiter instanceof AtomicRateLimiter) {
        AtomicRateLimiter atomicRateLimiter = (AtomicRateLimiter) rateLimiter;
        AtomicRateLimiter.AtomicRateLimiterMetrics detailedMetrics = atomicRateLimiter
            .getDetailedMetrics();
        if (detailedMetrics.getNanosToWait() > timeoutInNanos) {
            boolean allowHealthIndicatorToFail = allowHealthIndicatorToFail(rateLimiter);

            return rateLimiterHealth(allowHealthIndicatorToFail ? Status.DOWN : new Status("RATE_LIMITED"), availablePermissions, numberOfWaitingThreads);
        }
    }
    return rateLimiterHealth(Status.UNKNOWN, availablePermissions, numberOfWaitingThreads);
}
Example 3
Source File: AtomicRateLimiterTest.java    From resilience4j with Apache License 2.0 5 votes vote down vote up 
@Test
public void permissionsInFirstCycle() throws Exception {
    setup(Duration.ZERO);

    setTimeOnNanos(CYCLE_IN_NANOS - 10);
    RateLimiter.Metrics metrics = rateLimiter.getMetrics();
    int availablePermissions = metrics.getAvailablePermissions();
    then(availablePermissions).isEqualTo(PERMISSIONS_RER_CYCLE);
}
Example 4
Source File: AtomicRateLimiterTest.java    From resilience4j with Apache License 2.0 5 votes vote down vote up 
@Test
public void metricsTest() {
    setup(Duration.ZERO);

    RateLimiter.Metrics metrics = rateLimiter.getMetrics();
    then(metrics.getNumberOfWaitingThreads()).isEqualTo(0);
    then(metrics.getAvailablePermissions()).isEqualTo(1);

    AtomicRateLimiter.AtomicRateLimiterMetrics detailedMetrics = rateLimiter
        .getDetailedMetrics();
    then(detailedMetrics.getNumberOfWaitingThreads()).isEqualTo(0);
    then(detailedMetrics.getAvailablePermissions()).isEqualTo(1);
    then(detailedMetrics.getNanosToWait()).isEqualTo(0);
    then(detailedMetrics.getCycle()).isGreaterThan(0);
}
Example 5
Source File: SemaphoreBasedRateLimiterImplTest.java    From resilience4j with Apache License 2.0 5 votes vote down vote up 
@Test
public void getMetrics() throws Exception {
    ScheduledExecutorService scheduler = mock(ScheduledExecutorService.class);
    SemaphoreBasedRateLimiter limit = new SemaphoreBasedRateLimiter("test", config, scheduler);
    RateLimiter.Metrics metrics = limit.getMetrics();
    then(metrics.getNumberOfWaitingThreads()).isEqualTo(0);
}
Example 6
Source File: SemaphoreBasedRateLimiterImplTest.java    From resilience4j with Apache License 2.0 5 votes vote down vote up 
@Test
public void isUpperLimitedForPermissions() throws Exception {
    ScheduledExecutorService scheduler = mock(ScheduledExecutorService.class);
    SemaphoreBasedRateLimiter limit = new SemaphoreBasedRateLimiter("test", config, scheduler);
    RateLimiter.Metrics metrics = limit.getMetrics();
    then(metrics.getAvailablePermissions()).isEqualTo(2);
    limit.refreshLimit();
    then(metrics.getAvailablePermissions()).isEqualTo(2);
}
Example 7
Source File: SemaphoreBasedRateLimiterImplTest.java    From resilience4j with Apache License 2.0 5 votes vote down vote up 
@Test
public void getDetailedMetrics() throws Exception {
    ScheduledExecutorService scheduler = mock(ScheduledExecutorService.class);
    SemaphoreBasedRateLimiter limit = new SemaphoreBasedRateLimiter("test", config, scheduler);
    RateLimiter.Metrics metrics = limit.getMetrics();
    then(metrics.getNumberOfWaitingThreads()).isEqualTo(0);
    then(metrics.getAvailablePermissions()).isEqualTo(2);
}
Example 8
Source File: DecoratorsTest.java    From resilience4j with Apache License 2.0 5 votes vote down vote up 
private void alignTime(RateLimiter rateLimiter) {
    RateLimiter.Metrics metrics = rateLimiter.getMetrics();
    while (rateLimiter.acquirePermission()) {
        state = !state;
    }
    // Wait to the start of the next cycle in spin loop
    while (metrics.getAvailablePermissions() == 0) {
        state = !state;
    }
    System.out.println(state);
}
Example 9
Source File: SemaphoreBasedRateLimiterImplTest.java    From resilience4j with Apache License 2.0 4 votes vote down vote up 
@Test
public void acquirePermissionAndMetrics() throws Exception {

    ScheduledExecutorService scheduledExecutorService = mock(ScheduledExecutorService.class);
    RateLimiterConfig configSpy = spy(config);
    SemaphoreBasedRateLimiter limit = new SemaphoreBasedRateLimiter("test", configSpy,
        scheduledExecutorService);
    RateLimiter.Metrics detailedMetrics = limit.getMetrics();

    SynchronousQueue<Object> synchronousQueue = new SynchronousQueue<>();
    Thread thread = new Thread(() -> {
        run(() -> {
            for (int i = 0; i < LIMIT; i++) {
                synchronousQueue.put(O);
                limit.acquirePermission();
            }
            limit.acquirePermission();
        });
    });
    thread.setDaemon(true);
    thread.start();

    for (int i = 0; i < LIMIT; i++) {
        synchronousQueue.take();
    }

    awaitImpatiently()
        .atMost(100, TimeUnit.MILLISECONDS)
        .until(detailedMetrics::getAvailablePermissions, equalTo(0));
    awaitImpatiently()
        .atMost(2, TimeUnit.SECONDS).until(thread::getState, equalTo(TIMED_WAITING));
    then(detailedMetrics.getAvailablePermissions()).isEqualTo(0);

    limit.refreshLimit();
    awaitImpatiently()
        .atMost(100, TimeUnit.MILLISECONDS)
        .until(detailedMetrics::getAvailablePermissions, equalTo(1));
    awaitImpatiently()
        .atMost(2, TimeUnit.SECONDS).until(thread::getState, equalTo(TERMINATED));
    then(detailedMetrics.getAvailablePermissions()).isEqualTo(1);

    limit.changeLimitForPeriod(3);
    limit.refreshLimit();
    then(detailedMetrics.getAvailablePermissions()).isEqualTo(3);
}