modules/core/src/test/java/org/apache/ignite/internal/util/GridCountDownCallbackTest.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.ignite.internal.util;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.Test;

import static org.junit.Assert.assertTrue;

/**
 *
 */
public class GridCountDownCallbackTest {
    /** */
    @Test
    public void testCountDownCallback() throws InterruptedException {
        AtomicInteger cntr = new AtomicInteger(0);
        AtomicInteger performedCntr = new AtomicInteger(0);

        AtomicBoolean res = new AtomicBoolean();

        int countsTillCb = 30;

        GridCountDownCallback cb = new GridCountDownCallback(
            countsTillCb,
            () -> res.set(cntr.get() == countsTillCb && performedCntr.get() == countsTillCb / 5),
            0
        );

        ExecutorService es = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

        for (int i = 1; i < 100; i++) {
            es.submit(() -> {
                synchronized (es) {
                    int fi = cntr.incrementAndGet();

                    if (fi % 5 == 0)
                        performedCntr.incrementAndGet();

                    cb.countDown(fi % 5 == 0);
                }
            });
        }

        es.shutdown();

        es.awaitTermination(Long.MAX_VALUE, TimeUnit.SECONDS);

        assertTrue(res.get());
    }
}