| // Copyright 2023 The Bazel Authors. All rights reserved. |
| // |
| // 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.devtools.build.lib.remote.circuitbreaker; |
| |
| import static com.google.common.truth.Truth.assertThat; |
| |
| import com.google.devtools.build.lib.remote.Retrier.CircuitBreaker.State; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.stream.IntStream; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| |
| @RunWith(JUnit4.class) |
| public class FailureCircuitBreakerTest { |
| |
| @Test |
| public void testRecordFailure_circuitTrips() throws InterruptedException { |
| final int failureRateThreshold = 10; |
| final int windowInterval = 100; |
| FailureCircuitBreaker failureCircuitBreaker = |
| new FailureCircuitBreaker(failureRateThreshold, windowInterval); |
| |
| List<Runnable> listOfSuccessAndFailureCalls = new ArrayList<>(); |
| for (int index = 0; index < failureRateThreshold; index++) { |
| listOfSuccessAndFailureCalls.add(failureCircuitBreaker::recordFailure); |
| } |
| |
| for (int index = 0; index < failureRateThreshold * 9; index++) { |
| listOfSuccessAndFailureCalls.add(failureCircuitBreaker::recordSuccess); |
| } |
| |
| Collections.shuffle(listOfSuccessAndFailureCalls); |
| |
| // make calls equals to threshold number of not ignored failure calls in parallel. |
| listOfSuccessAndFailureCalls.stream().parallel().forEach(Runnable::run); |
| assertThat(failureCircuitBreaker.state()).isEqualTo(State.ACCEPT_CALLS); |
| |
| // Sleep for windowInterval + 1ms. |
| Thread.sleep(windowInterval + 1 /*to compensate any delay*/); |
| |
| // make calls equals to threshold number of not ignored failure calls in parallel. |
| listOfSuccessAndFailureCalls.stream().parallel().forEach(Runnable::run); |
| assertThat(failureCircuitBreaker.state()).isEqualTo(State.ACCEPT_CALLS); |
| |
| // Sleep for less than windowInterval. |
| Thread.sleep(windowInterval - 5); |
| failureCircuitBreaker.recordFailure(); |
| assertThat(failureCircuitBreaker.state()).isEqualTo(State.REJECT_CALLS); |
| } |
| |
| @Test |
| public void testRecordFailure_minCallCriteriaNotMet() throws InterruptedException { |
| final int failureRateThreshold = 10; |
| final int windowInterval = 100; |
| final int minCallToComputeFailure = |
| CircuitBreakerFactory.DEFAULT_MIN_CALL_COUNT_TO_COMPUTE_FAILURE_RATE; |
| FailureCircuitBreaker failureCircuitBreaker = |
| new FailureCircuitBreaker(failureRateThreshold, windowInterval); |
| |
| // make half failure call, half success call and number of total call less than |
| // minCallToComputeFailure. |
| IntStream.range(0, minCallToComputeFailure >> 1) |
| .parallel() |
| .forEach(i -> failureCircuitBreaker.recordFailure()); |
| IntStream.range(0, minCallToComputeFailure >> 1) |
| .parallel() |
| .forEach(i -> failureCircuitBreaker.recordSuccess()); |
| assertThat(failureCircuitBreaker.state()).isEqualTo(State.ACCEPT_CALLS); |
| |
| // Sleep for less than windowInterval. |
| Thread.sleep(windowInterval - 50); |
| failureCircuitBreaker.recordFailure(); |
| assertThat(failureCircuitBreaker.state()).isEqualTo(State.REJECT_CALLS); |
| } |
| } |