140 lines
4.5 KiB
Java
140 lines
4.5 KiB
Java
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* This file is available under and governed by the GNU General Public
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* License version 2 only, as published by the Free Software Foundation.
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* However, the following notice accompanied the original version of this
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* file:
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*
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* Written by Doug Lea and Martin Buchholz with assistance from
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* members of JCP JSR-166 Expert Group and released to the public
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* domain, as explained at
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* http://creativecommons.org/publicdomain/zero/1.0/
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*/
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Comparator;
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import java.util.List;
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import java.util.Set;
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import java.util.concurrent.Callable;
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import java.util.concurrent.CompletionService;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.Executor;
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import java.util.concurrent.ExecutorCompletionService;
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import java.util.concurrent.Future;
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import junit.framework.Test;
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import junit.framework.TestSuite;
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public class ExecutorCompletionService9Test extends JSR166TestCase {
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public static void main(String[] args) {
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main(suite(), args);
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}
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public static Test suite() {
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return new TestSuite(ExecutorCompletionService9Test.class);
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}
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void solveAll(Executor e,
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Collection<Callable<Integer>> solvers)
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throws InterruptedException, ExecutionException {
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CompletionService<Integer> cs
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= new ExecutorCompletionService<>(e);
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solvers.forEach(cs::submit);
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for (int i = solvers.size(); i > 0; i--) {
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Integer r = cs.take().get();
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if (r != null)
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use(r);
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}
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}
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void solveAny(Executor e,
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Collection<Callable<Integer>> solvers)
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throws InterruptedException {
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CompletionService<Integer> cs
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= new ExecutorCompletionService<>(e);
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int n = solvers.size();
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List<Future<Integer>> futures = new ArrayList<>(n);
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Integer result = null;
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try {
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solvers.forEach(solver -> futures.add(cs.submit(solver)));
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for (int i = n; i > 0; i--) {
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try {
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Integer r = cs.take().get();
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if (r != null) {
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result = r;
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break;
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}
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} catch (ExecutionException ignore) {}
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}
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} finally {
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futures.forEach(future -> future.cancel(true));
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}
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if (result != null)
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use(result);
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}
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ArrayList<Integer> results;
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void use(Integer x) {
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if (results == null) results = new ArrayList<>();
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results.add(x);
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}
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/**
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* The first "solvers" sample code in the class javadoc works.
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*/
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public void testSolveAll()
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throws InterruptedException, ExecutionException {
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results = null;
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Set<Callable<Integer>> solvers = Set.of(
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() -> null,
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() -> 1,
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() -> 2,
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() -> 3,
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() -> null);
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solveAll(cachedThreadPool, solvers);
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results.sort(Comparator.naturalOrder());
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assertEquals(List.of(1, 2, 3), results);
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}
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/**
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* The second "solvers" sample code in the class javadoc works.
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*/
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public void testSolveAny()
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throws InterruptedException {
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results = null;
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Set<Callable<Integer>> solvers = Set.of(
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() -> { throw new ArithmeticException(); },
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() -> null,
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() -> 1,
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() -> 2);
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solveAny(cachedThreadPool, solvers);
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assertEquals(1, results.size());
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Integer elt = results.get(0);
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assertTrue(elt.equals(1) || elt.equals(2));
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}
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}
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