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/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
* Copyright © 2017-2018 Amdocs
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
package org.onap.aai.spike.event;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import org.junit.Test;
import org.onap.aai.spike.event.incoming.OffsetManager;
public class OffsetManagerTest {
/**
* This test validates that as events are cached, and flagged as published, that the 'safe' offset
* is advanced correctly.
*/
@Test
public void testOffsetAdvancement() throws Exception {
final Long offsetPeriod = 50L; // ms
// Create an instance of the offset manager.
OffsetManager offsetManager = new OffsetManager(10, offsetPeriod);
// Now, cache some events as if we had consumed them and they
// are in flight.
final int event1Index = offsetManager.cacheEvent("1", 1);
final int event2Index = offsetManager.cacheEvent("2", 2);
final int event3Index = offsetManager.cacheEvent("3", 3);
final int event4Index = offsetManager.cacheEvent("4", 4);
// Mark some of them as 'published'
offsetManager.markAsPublished(event1Index);
offsetManager.markAsPublished(event2Index);
offsetManager.markAsPublished(event4Index);
// Validate that the offset manager reported the expected offset (ie: we can only commit up
// to event2, event though event4 has been processed, since event3 is still in flight).
Long nextOffset = waitForOffsetUpdate(null, offsetPeriod, offsetManager);
assertTrue("Unexpected 'next offset' value. Expected=2, actual=" + nextOffset, nextOffset == 2);
// Now, let's mark event3 as 'published'. We should see the next safe offset
// advance to event4 (since is was previously flagged as 'published').
offsetManager.markAsPublished(event3Index);
nextOffset = waitForOffsetUpdate(nextOffset, offsetPeriod, offsetManager);
assertTrue("Unexpected 'next offset' value. Expected=4, actual=" + nextOffset, nextOffset == 4);
}
private Long waitForOffsetUpdate(Long currentOffset, Long offsetPeriod, OffsetManager offsetManager)
throws InterruptedException {
Long newOffset = currentOffset;
int retries = 3;
while (currentOffset == newOffset) {
// Wait long enough for the offset manager to have hopefully kicked it's offset
// update task.
Thread.sleep(offsetPeriod);
newOffset = offsetManager.getNextOffsetToCommit();
// We might have just missed the update due to timing, so we will retry a
// few times before giving up...
retries--;
if (retries == 0) {
fail("Safe offset was not updated as expected");
}
}
return newOffset;
}
}
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