TestInFlightMessageTracker.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.nifi.processors.kafka.pubsub;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeoutException;

import org.apache.nifi.util.MockFlowFile;
import org.junit.Assert;
import org.junit.Test;

public class TestInFlightMessageTracker {

    @Test(timeout = 5000L)
    public void testAwaitCompletionWhenComplete() throws InterruptedException, TimeoutException {
        final MockFlowFile flowFile = new MockFlowFile(1L);

        final InFlightMessageTracker tracker = new InFlightMessageTracker();
        tracker.incrementSentCount(flowFile);

        verifyNotComplete(tracker);

        tracker.incrementSentCount(flowFile);
        verifyNotComplete(tracker);

        tracker.incrementAcknowledgedCount(flowFile);
        verifyNotComplete(tracker);

        tracker.incrementAcknowledgedCount(flowFile);
        tracker.awaitCompletion(1L);
    }

    @Test(timeout = 5000L)
    public void testAwaitCompletionWhileWaiting() throws InterruptedException, ExecutionException {
        final MockFlowFile flowFile = new MockFlowFile(1L);

        final InFlightMessageTracker tracker = new InFlightMessageTracker();
        tracker.incrementSentCount(flowFile);

        verifyNotComplete(tracker);

        tracker.incrementSentCount(flowFile);
        verifyNotComplete(tracker);

        final ExecutorService exec = Executors.newFixedThreadPool(1);
        final Future<?> future = exec.submit(() -> {
            try {
                tracker.awaitCompletion(10000L);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        });

        tracker.incrementAcknowledgedCount(flowFile);
        tracker.incrementAcknowledgedCount(flowFile);

        future.get();
    }

    private void verifyNotComplete(final InFlightMessageTracker tracker) throws InterruptedException {
        try {
            tracker.awaitCompletion(10L);
            Assert.fail("Expected timeout");
        } catch (final TimeoutException te) {
            // expected
        }
    }

}