1 | /**
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2 | * Copyright 2012-2017 Michael Tamm and other junit-toolbox contributors
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | */
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16 | package org.openstreetmap.josm.testutils;
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17 |
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18 | import static java.util.concurrent.ForkJoinTask.inForkJoinPool;
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19 |
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20 | import java.util.Deque;
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21 | import java.util.LinkedList;
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22 | import java.util.concurrent.ForkJoinPool;
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23 | import java.util.concurrent.ForkJoinTask;
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24 | import java.util.concurrent.ForkJoinWorkerThread;
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25 |
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26 | import org.junit.runners.model.RunnerScheduler;
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27 |
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28 | /**
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29 | * Encapsulates the singleton {@link ForkJoinPool} used by {@link ParallelParameterized}
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30 | * to execute test classes and test methods concurrently.
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31 | *
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32 | * @author Michael Tamm (junit-toolbox)
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33 | */
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34 | class ParallelScheduler implements RunnerScheduler {
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35 |
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36 | static ForkJoinPool forkJoinPool = setUpForkJoinPool();
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37 |
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38 | static ForkJoinPool setUpForkJoinPool() {
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39 | Runtime runtime = Runtime.getRuntime();
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40 | int numThreads = Math.max(2, runtime.availableProcessors());
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41 | ForkJoinPool.ForkJoinWorkerThreadFactory threadFactory = pool -> {
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42 | if (pool.getPoolSize() >= pool.getParallelism()) {
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43 | return null;
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44 | } else {
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45 | ForkJoinWorkerThread thread = ForkJoinPool.defaultForkJoinWorkerThreadFactory.newThread(pool);
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46 | thread.setName("JUnit-" + thread.getName());
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47 | return thread;
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48 | }
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49 | };
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50 | return new ForkJoinPool(numThreads, threadFactory, null, false);
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51 | }
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52 |
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53 | private final Deque<ForkJoinTask<?>> _asyncTasks = new LinkedList<>();
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54 | private Runnable _lastScheduledChild;
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55 |
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56 | @Override
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57 | public void schedule(Runnable childStatement) {
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58 | if (_lastScheduledChild != null) {
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59 | // Execute previously scheduled child asynchronously ...
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60 | if (inForkJoinPool()) {
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61 | _asyncTasks.addFirst(ForkJoinTask.adapt(_lastScheduledChild).fork());
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62 | } else {
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63 | _asyncTasks.addFirst(forkJoinPool.submit(_lastScheduledChild));
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64 | }
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65 | }
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66 | // Note: We don't schedule the childStatement immediately here,
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67 | // but remember it, so that we can synchronously execute the
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68 | // last scheduled child in the finished method() -- this way,
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69 | // the current thread does not immediately call join() in the
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70 | // finished() method, which might block it ...
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71 | _lastScheduledChild = childStatement;
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72 | }
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73 |
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74 | @Override
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75 | public void finished() {
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76 | RuntimeException me = new RuntimeException();
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77 | if (_lastScheduledChild != null) {
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78 | if (inForkJoinPool()) {
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79 | // Execute the last scheduled child in the current thread ...
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80 | try {
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81 | _lastScheduledChild.run();
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82 | } catch (Throwable t) {
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83 | me.addSuppressed(t);
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84 | }
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85 | } else {
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86 | // Submit the last scheduled child to the ForkJoinPool too,
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87 | // because all tests should run in the worker threads ...
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88 | _asyncTasks.addFirst(forkJoinPool.submit(_lastScheduledChild));
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89 | }
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90 | // Make sure all asynchronously executed children are done, before we return ...
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91 | for (ForkJoinTask<?> task : _asyncTasks) {
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92 | // Note: Because we have added all tasks via addFirst into _asyncTasks,
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93 | // task.join() is able to steal tasks from other worker threads,
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94 | // if there are tasks, which have not been started yet ...
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95 | // from other worker threads ...
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96 | try {
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97 | task.join();
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98 | } catch (Throwable t) {
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99 | me.addSuppressed(t);
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100 | }
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101 | }
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102 | if (me.getSuppressed().length > 0) {
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103 | throw me;
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104 | }
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105 | }
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106 | }
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107 | }
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