/*
* 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.kafka.streams.processor.internals;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.MatcherAssert.assertThat;
import org.junit.Test;
public class MinTimestampTrackerTest {
private MinTimestampTracker<String> tracker = new MinTimestampTracker<>();
@Test
public void shouldReturnNotKnownTimestampWhenNoRecordsEverAdded() throws Exception {
assertThat(tracker.get(), equalTo(TimestampTracker.NOT_KNOWN));
}
@Test
public void shouldReturnTimestampOfOnlyRecord() throws Exception {
tracker.addElement(elem(100));
assertThat(tracker.get(), equalTo(100L));
}
@Test
public void shouldReturnLowestAvailableTimestampFromAllInputs() throws Exception {
tracker.addElement(elem(100));
tracker.addElement(elem(99));
tracker.addElement(elem(102));
assertThat(tracker.get(), equalTo(99L));
}
@Test
public void shouldReturnLowestAvailableTimestampAfterPreviousLowestRemoved() throws Exception {
final Stamped<String> lowest = elem(88);
tracker.addElement(lowest);
tracker.addElement(elem(101));
tracker.addElement(elem(99));
tracker.removeElement(lowest);
assertThat(tracker.get(), equalTo(99L));
}
@Test
public void shouldReturnLastKnownTimestampWhenAllElementsHaveBeenRemoved() throws Exception {
final Stamped<String> record = elem(98);
tracker.addElement(record);
tracker.removeElement(record);
assertThat(tracker.get(), equalTo(98L));
}
@Test
public void shouldIgnoreNullRecordOnRemove() throws Exception {
tracker.removeElement(null);
}
@Test(expected = NullPointerException.class)
public void shouldThrowNullPointerExceptionWhenTryingToAddNullElement() throws Exception {
tracker.addElement(null);
}
private Stamped<String> elem(final long timestamp) {
return new Stamped<>("", timestamp);
}
}