AutoScalingEventExecutorChooserFactoryTest.java — netty Source File

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/*
 * Copyright 2025 The Netty Project
 *
 * The Netty Project licenses this file to you 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:
 *
 *   https://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 io.netty.util.concurrent;

import io.netty.util.concurrent.AutoScalingEventExecutorChooserFactory.AutoScalingUtilizationMetric;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Timeout;

import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.fail;

public class AutoScalingEventExecutorChooserFactoryTest {

    private static void busyTask(long duration, TimeUnit unit) {
        long endTime = System.nanoTime() + unit.toNanos(duration);
        while (System.nanoTime() < endTime) {
            // Spin-wait to simulate CPU usage
        }
    }

    private static final class TestEventExecutor extends SingleThreadEventExecutor {
        private final AtomicBoolean highLoad = new AtomicBoolean(false);

        TestEventExecutor(EventExecutorGroup parent, Executor executor) {
            super(parent, executor, true, true, DEFAULT_MAX_PENDING_EXECUTOR_TASKS,
                  RejectedExecutionHandlers.reject());
        }

        void setHighLoad(boolean highLoad) {
            this.highLoad.set(highLoad);
        }

        @Override
        protected void run() {
            do {
                if (highLoad.get()) {
                    runAllTasks(TimeUnit.MILLISECONDS.toNanos(20));
                    long busyWorkStart = ticker().nanoTime();
                    busyTask(35, TimeUnit.MILLISECONDS);
// ... (289 more lines)