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/*
* Copyright 2016, 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.internal;
import static com.google.common.truth.Truth.assertThat;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** Unit tests for {@link DisruptorEventQueue}. */
@RunWith(JUnit4.class)
public class DisruptorEventQueueTest {
// Simple class to use that keeps an incrementing counter. Will fail with an assertion if
// increment is used from multiple threads, or if the stored value is different from that expected
// by the caller.
private static class Counter {
private int count;
private volatile long id; // stores thread ID used in first increment operation.
public Counter() {
count = 0;
id = -1;
}
// Increments counter by 1. Will fail in assertion if multiple different threads are used
// (the EventQueue backend should be single-threaded).
public void increment() {
long tid = Thread.currentThread().getId();
if (id == -1) {
assertThat(count).isEqualTo(0);
id = tid;
} else {
assertThat(id).isEqualTo(tid);
}
count++;
}
// Check the current value of the counter. Assert if it is not the expected value.
public void check(int value) {
assertThat(count).isEqualTo(value);
}
}
// EventQueueEntry for incrementing a Counter.
private static class IncrementEvent implements EventQueue.Entry {
private final Counter counter;
IncrementEvent(Counter counter) {
this.counter = counter;
}
@Override
public void process() {
counter.increment();
}
}
@Test
public void incrementOnce() {
Counter counter = new Counter();
IncrementEvent ie = new IncrementEvent(counter);
DisruptorEventQueue.getInstance().enqueue(ie);
// Sleep briefly, to allow background operations to complete.
try {
Thread.sleep(500);
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
counter.check(1);
}
@Test
public void incrementTenK() {
final int tenK = 10000;
Counter counter = new Counter();
for (int i = 0; i < tenK; i++) {
IncrementEvent ie = new IncrementEvent(counter);
DisruptorEventQueue.getInstance().enqueue(ie);
}
// Sleep briefly, to allow background operations to complete.
try {
Thread.sleep(500);
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
counter.check(tenK);
}
}
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