| /* |
| * 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.beam.runners.dataflow.worker; |
| |
| import static org.hamcrest.MatcherAssert.assertThat; |
| import static org.hamcrest.Matchers.equalTo; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.TimeoutException; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import org.apache.beam.sdk.metrics.MetricName; |
| import org.junit.Before; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| |
| /** Tests for {@link DeltaCounterCell}. */ |
| @RunWith(JUnit4.class) |
| public class DeltaCounterCellTest { |
| |
| private DeltaCounterCell cell; |
| |
| @Before |
| public void setUp() { |
| cell = new DeltaCounterCell(MetricName.named("hello", "world")); |
| } |
| |
| @Test |
| public void testDelta() { |
| cell.inc(5); |
| cell.inc(7); |
| assertThat(cell.getSumAndReset(), equalTo(12L)); |
| assertThat(cell.getSumAndReset(), equalTo(0L)); |
| |
| cell.inc(5); |
| assertThat(cell.getSumAndReset(), equalTo(5L)); |
| } |
| |
| /** |
| * Ensure that incrementing and getSumAndRest are correct under concurrent reader and writer |
| * threads. |
| */ |
| @Test(timeout = 30 * 1000) |
| public void testAtomicSumAndReset() |
| throws InterruptedException, ExecutionException, TimeoutException { |
| long updatesPerWriter = 10_000; |
| int numReaders = 3; |
| int numWriters = 5; |
| ExecutorService executor = Executors.newFixedThreadPool(numReaders + numWriters); |
| AtomicBoolean doneWriting = new AtomicBoolean(false); |
| |
| Callable<Long> reader = |
| () -> { |
| long count = 0; |
| boolean isLastRead; |
| do { |
| isLastRead = doneWriting.get(); |
| count += cell.getSumAndReset(); |
| } while (!isLastRead); |
| return count; |
| }; |
| Runnable writer = |
| () -> { |
| for (int i = 0; i < updatesPerWriter; i++) { |
| cell.inc(); |
| } |
| }; |
| |
| // NB: Readers are invoked before writers to ensure they execute |
| // concurrently. |
| List<Future<Long>> results = new ArrayList<>(numReaders); |
| for (int i = 0; i < numReaders; i++) { |
| results.add(executor.submit(reader)); |
| } |
| |
| executor.invokeAll(Collections.nCopies(numWriters, Executors.callable(writer, 0L))); |
| doneWriting.set(true); |
| |
| long count = 0; |
| for (Future<Long> result : results) { |
| count += result.get(); |
| } |
| assertThat(count, equalTo(numWriters * updatesPerWriter)); |
| } |
| } |