TestComplexCancellable.java

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package org.apache.hc.core5.concurrent;

import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;

import org.junit.jupiter.api.Test;

import java.util.concurrent.CountDownLatch;

class TestComplexCancellable {

    @Test
    void testCancelled() {
        final ComplexCancellable cancellable = new ComplexCancellable();

        final BasicFuture<Object> dependency1 = new BasicFuture<>(null);
        cancellable.setDependency(dependency1);

        assertFalse(cancellable.isCancelled());

        cancellable.cancel();
        assertTrue(cancellable.isCancelled());
        assertTrue(dependency1.isCancelled());

        final BasicFuture<Object> dependency2 = new BasicFuture<>(null);
        cancellable.setDependency(dependency2);
        assertTrue(dependency2.isCancelled());
    }

    @Test
    void testSetDependencyRace() throws InterruptedException {
        final ComplexCancellable cancellable = new ComplexCancellable();
        final BasicFuture<Object> dependency1 = new BasicFuture<>(null);
        final BasicFuture<Object> dependency2 = new BasicFuture<>(null);
        final CountDownLatch latch = new CountDownLatch(2);

        for (int i = 0; i < 2; i++) {
            new Thread(() -> {
                for (int j = 0; j < 5_000; j++) {
                    cancellable.setDependency(dependency1);
                    cancellable.setDependency(dependency2);
                }
                latch.countDown();
            }).start();
        }
        latch.await();

        assertFalse(dependency1.isCancelled());
        assertFalse(dependency2.isCancelled());
    }
}