Jordan Halterman | 046faeb | 2017-05-01 15:10:13 -0700 | [diff] [blame] | 1 | /* |
Brian O'Connor | a09fe5b | 2017-08-03 21:12:30 -0700 | [diff] [blame] | 2 | * Copyright 2017-present Open Networking Foundation |
Jordan Halterman | 046faeb | 2017-05-01 15:10:13 -0700 | [diff] [blame] | 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.onlab.util; |
| 17 | |
| 18 | import java.util.concurrent.CompletableFuture; |
| 19 | import java.util.concurrent.CountDownLatch; |
| 20 | import java.util.concurrent.Executor; |
| 21 | import java.util.concurrent.TimeUnit; |
| 22 | |
| 23 | import org.junit.Test; |
| 24 | |
| 25 | import static org.junit.Assert.assertEquals; |
| 26 | import static org.junit.Assert.assertFalse; |
| 27 | import static org.junit.Assert.assertTrue; |
| 28 | |
| 29 | /** |
| 30 | * Blocking-aware future test. |
| 31 | */ |
| 32 | public class BlockingAwareFutureTest { |
| 33 | |
| 34 | /** |
| 35 | * Tests normal callback execution. |
| 36 | */ |
| 37 | @Test |
| 38 | public void testNonBlockingThread() throws Exception { |
| 39 | CompletableFuture<String> future = new CompletableFuture<>(); |
| 40 | Executor executor = SharedExecutors.getPoolThreadExecutor(); |
| 41 | BlockingAwareFuture<String> blockingFuture = |
| 42 | (BlockingAwareFuture<String>) Tools.orderedFuture(future, new OrderedExecutor(executor), executor); |
| 43 | CountDownLatch latch = new CountDownLatch(1); |
| 44 | blockingFuture.thenRun(() -> latch.countDown()); |
| 45 | executor.execute(() -> future.complete("foo")); |
| 46 | latch.await(5, TimeUnit.SECONDS); |
| 47 | assertEquals(0, latch.getCount()); |
| 48 | assertEquals("foo", blockingFuture.join()); |
| 49 | assertFalse(blockingFuture.isBlocked()); |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * Tests blocking an ordered thread. |
| 54 | */ |
| 55 | @Test |
| 56 | public void testBlockingThread() throws Exception { |
| 57 | CompletableFuture<String> future = new CompletableFuture<>(); |
| 58 | Executor executor = SharedExecutors.getPoolThreadExecutor(); |
| 59 | BlockingAwareFuture<String> blockingFuture = |
| 60 | (BlockingAwareFuture<String>) Tools.orderedFuture(future, new OrderedExecutor(executor), executor); |
| 61 | CountDownLatch latch = new CountDownLatch(2); |
| 62 | CompletableFuture<String> wrappedFuture = blockingFuture.thenApply(v -> { |
| 63 | assertEquals("foo", v); |
| 64 | latch.countDown(); |
| 65 | return v; |
| 66 | }); |
| 67 | wrappedFuture.thenRun(() -> latch.countDown()); |
| 68 | executor.execute(() -> wrappedFuture.join()); |
| 69 | Thread.sleep(100); |
| 70 | assertTrue(blockingFuture.isBlocked()); |
| 71 | future.complete("foo"); |
| 72 | latch.await(5, TimeUnit.SECONDS); |
| 73 | assertEquals(0, latch.getCount()); |
| 74 | assertEquals("foo", blockingFuture.join()); |
| 75 | assertEquals("foo", wrappedFuture.join()); |
| 76 | assertFalse(blockingFuture.isBlocked()); |
| 77 | } |
| 78 | |
| 79 | } |