test/unit/org/apache/cassandra/net/AsyncOneResponseTest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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
 *
 *     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 org.apache.cassandra.net;

import java.util.concurrent.TimeUnit;

import org.junit.Assert;
import org.junit.Test;

import static org.junit.Assert.assertTrue;

public class AsyncOneResponseTest
{
    @Test
    public void getThrowsExceptionAfterTimeout() throws InterruptedException
    {
        AsyncOneResponse<Object> response = new AsyncOneResponse<>();
        Thread.sleep(2000);
        Assert.assertFalse(response.await(1, TimeUnit.SECONDS));
    }

    @Test
    public void getThrowsExceptionAfterCorrectTimeout() throws InterruptedException
    {
        AsyncOneResponse<Object> response = new AsyncOneResponse<>();

        final long expectedTimeoutMillis = 1000; // Should time out after roughly this time
        final long schedulingError = 10; // Scheduling is imperfect

        long startTime = System.nanoTime();
        boolean timeout = !response.await(expectedTimeoutMillis, TimeUnit.MILLISECONDS);
        long endTime = System.nanoTime();

        assertTrue(timeout);
        assertTrue(TimeUnit.NANOSECONDS.toMillis(endTime - startTime) > (expectedTimeoutMillis - schedulingError));
    }
}