/
RateLimiterTest.java
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/
RateLimiterTest.java
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/*
* Copyright 2020 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.cloud.firestore;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.util.Date;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.runners.MockitoJUnitRunner;
@RunWith(MockitoJUnitRunner.class)
public class RateLimiterTest {
private RateLimiter limiter;
@Before
public void before() {
limiter =
new RateLimiter(
/* initialCapacity= */ 500,
/* multiplier= */ 1.5,
/* multiplierMillis= */ 5 * 60 * 1000,
/* startTime= */ new Date(0).getTime());
}
@Test
public void processRequestsFromCapacity() {
assertTrue(limiter.tryMakeRequest(250, new Date(0).getTime()));
assertTrue(limiter.tryMakeRequest(250, new Date(0).getTime()));
// Once tokens have been used, further requests should fail.
assertFalse(limiter.tryMakeRequest(1, new Date(0).getTime()));
// Tokens will only refill up to max capacity.
assertFalse(limiter.tryMakeRequest(501, new Date(1 * 1000).getTime()));
assertTrue(limiter.tryMakeRequest(500, new Date(1 * 1000).getTime()));
// Tokens will refill incrementally based on number of ms elapsed.
assertFalse(limiter.tryMakeRequest(250, new Date(1 * 1000 + 499).getTime()));
assertTrue(limiter.tryMakeRequest(249, new Date(1 * 1000 + 500).getTime()));
// Scales with multiplier.
assertFalse(limiter.tryMakeRequest(751, new Date((5 * 60 - 1) * 1000).getTime()));
assertFalse(limiter.tryMakeRequest(751, new Date(5 * 60 * 1000).getTime()));
assertTrue(limiter.tryMakeRequest(750, new Date(5 * 60 * 1000).getTime()));
// Tokens will never exceed capacity.
assertFalse(limiter.tryMakeRequest(751, new Date((5 * 60 + 3) * 1000).getTime()));
// Rejects requests made before lastRefillTime.
try {
limiter.tryMakeRequest(751, new Date((5 * 60 + 2) * 1000).getTime());
fail();
} catch (IllegalArgumentException e) {
assertEquals("Request time should not be before the last token refill time", e.getMessage());
}
}
@Test
public void calculatesMsForNextRequest() {
// Should return 0 if there are enough tokens for the request to be made.
long timestamp = new Date(0).getTime();
assertEquals(0, limiter.getNextRequestDelayMs(500, timestamp));
// Should factor in remaining tokens when calculating the time.
assertTrue(limiter.tryMakeRequest(250, timestamp));
assertEquals(500, limiter.getNextRequestDelayMs(500, timestamp));
// Once tokens have been used, should calculate time before next request.
timestamp = new Date(1 * 1000).getTime();
assertTrue(limiter.tryMakeRequest(500, timestamp));
assertEquals(200, limiter.getNextRequestDelayMs(100, timestamp));
assertEquals(500, limiter.getNextRequestDelayMs(250, timestamp));
assertEquals(1000, limiter.getNextRequestDelayMs(500, timestamp));
assertEquals(-1, limiter.getNextRequestDelayMs(501, timestamp));
// Scales with multiplier.
timestamp = new Date(5 * 60 * 1000).getTime();
assertTrue(limiter.tryMakeRequest(750, timestamp));
assertEquals(334, limiter.getNextRequestDelayMs(250, timestamp));
assertEquals(667, limiter.getNextRequestDelayMs(500, timestamp));
assertEquals(1000, limiter.getNextRequestDelayMs(750, timestamp));
assertEquals(-1, limiter.getNextRequestDelayMs(751, timestamp));
}
@Test
public void calculatesMaxOperations() {
assertEquals(500, limiter.calculateCapacity(new Date(0).getTime()));
assertEquals(750, limiter.calculateCapacity(new Date(5 * 60 * 1000).getTime()));
assertEquals(1125, limiter.calculateCapacity(new Date(10 * 60 * 1000).getTime()));
assertEquals(1687, limiter.calculateCapacity(new Date(15 * 60 * 1000).getTime()));
assertEquals(738945, limiter.calculateCapacity(new Date(90 * 60 * 1000).getTime()));
}
}