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/*
* Copyright 2017, Google Inc.
* 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.
*/
package io.opencensus.implcore.trace.internal;
import static com.google.common.truth.Truth.assertThat;
import io.opencensus.implcore.trace.internal.ConcurrentIntrusiveList;
import io.opencensus.implcore.trace.internal.ConcurrentIntrusiveList.Element;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** Unit tests for {@link ConcurrentIntrusiveList}. */
@RunWith(JUnit4.class)
public class ConcurrentIntrusiveListTest {
private final ConcurrentIntrusiveList<FakeElement> intrusiveList =
new ConcurrentIntrusiveList<FakeElement>();
@Rule public final ExpectedException exception = ExpectedException.none();
@Test
public void emptyList() {
assertThat(intrusiveList.size()).isEqualTo(0);
assertThat(intrusiveList.getAll().isEmpty()).isTrue();
}
@Test
public void addRemoveAdd_SameElement() {
FakeElement element = new FakeElement();
intrusiveList.addElement(element);
assertThat(intrusiveList.size()).isEqualTo(1);
intrusiveList.removeElement(element);
assertThat(intrusiveList.size()).isEqualTo(0);
intrusiveList.addElement(element);
assertThat(intrusiveList.size()).isEqualTo(1);
}
@Test
public void addAndRemoveElements() {
FakeElement element1 = new FakeElement();
FakeElement element2 = new FakeElement();
FakeElement element3 = new FakeElement();
intrusiveList.addElement(element1);
intrusiveList.addElement(element2);
intrusiveList.addElement(element3);
assertThat(intrusiveList.size()).isEqualTo(3);
assertThat(intrusiveList.getAll()).containsExactly(element3, element2, element1).inOrder();
// Remove element from the middle of the list.
intrusiveList.removeElement(element2);
assertThat(intrusiveList.size()).isEqualTo(2);
assertThat(intrusiveList.getAll()).containsExactly(element3, element1).inOrder();
// Remove element from the tail of the list.
intrusiveList.removeElement(element1);
assertThat(intrusiveList.size()).isEqualTo(1);
assertThat(intrusiveList.getAll().contains(element3)).isTrue();
intrusiveList.addElement(element1);
assertThat(intrusiveList.size()).isEqualTo(2);
assertThat(intrusiveList.getAll()).containsExactly(element1, element3).inOrder();
// Remove element from the head of the list when there are other elements after.
intrusiveList.removeElement(element1);
assertThat(intrusiveList.size()).isEqualTo(1);
assertThat(intrusiveList.getAll().contains(element3)).isTrue();
// Remove element from the head of the list when no more other elements in the list.
intrusiveList.removeElement(element3);
assertThat(intrusiveList.size()).isEqualTo(0);
assertThat(intrusiveList.getAll().isEmpty()).isTrue();
}
@Test
public void addAlreadyAddedElement() {
FakeElement element = new FakeElement();
intrusiveList.addElement(element);
exception.expect(IllegalArgumentException.class);
intrusiveList.addElement(element);
}
@Test
public void removeNotAddedElement() {
FakeElement element = new FakeElement();
exception.expect(IllegalArgumentException.class);
intrusiveList.removeElement(element);
}
private static final class FakeElement implements Element<FakeElement> {
private FakeElement next = null;
private FakeElement prev = null;
@Override
public FakeElement getNext() {
return next;
}
@Override
public void setNext(FakeElement element) {
next = element;
}
@Override
public FakeElement getPrev() {
return prev;
}
@Override
public void setPrev(FakeElement element) {
prev = element;
}
}
}
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