//
// 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 com.cloud.network.nicira;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.equalTo;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.Test;
public class ExecutionCounterTest {
@Test
public void testIncrementCounter() throws Exception {
final ExecutionCounter executionCounter = new ExecutionCounter(-1);
executionCounter.incrementExecutionCounter().incrementExecutionCounter();
assertThat(executionCounter.getValue(), equalTo(2));
}
@Test
public void testHasNotYetReachedTheExecutuionLimit() throws Exception {
final ExecutionCounter executionCounter = new ExecutionCounter(2);
executionCounter.incrementExecutionCounter();
assertThat(executionCounter.hasReachedExecutionLimit(), equalTo(false));
}
@Test
public void testHasAlreadyReachedTheExecutuionLimit() throws Exception {
final ExecutionCounter executionCounter = new ExecutionCounter(2);
executionCounter.incrementExecutionCounter().incrementExecutionCounter();
assertThat(executionCounter.hasReachedExecutionLimit(), equalTo(true));
}
@Test
public void testConcurrentUpdatesToCounter() throws Exception {
final ExecutionCounter executionCounter = new ExecutionCounter(0);
final ExecutorService executorService = Executors.newFixedThreadPool(3);
final AtomicInteger counterTask1 = new AtomicInteger(-1);
final AtomicInteger counterTask2 = new AtomicInteger(-1);
final AtomicInteger counterTask3 = new AtomicInteger(-1);
final Runnable task1 = new Runnable() {
@Override
public void run() {
executionCounter.incrementExecutionCounter().incrementExecutionCounter();
executionCounter.incrementExecutionCounter().incrementExecutionCounter();
counterTask1.set(executionCounter.getValue());
}
};
final Runnable task2 = new Runnable() {
@Override
public void run() {
executionCounter.incrementExecutionCounter().incrementExecutionCounter();
counterTask2.set(executionCounter.getValue());
}
};
final Runnable task3 = new Runnable() {
@Override
public void run() {
counterTask3.set(executionCounter.getValue());
}
};
executorService.execute(task1);
executorService.execute(task2);
executorService.execute(task3);
executorService.shutdown();
executorService.awaitTermination(5L, TimeUnit.SECONDS);
assertThat(counterTask1.get(), equalTo(4));
assertThat(counterTask2.get(), equalTo(2));
assertThat(counterTask3.get(), equalTo(0));
}
}