test/tck/ExecutorCompletionService9Test.java

/*
 * Written by Doug Lea and Martin Buchholz with assistance from
 * members of JCP JSR-166 Expert Group and released to the public
 * domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 */

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Set;
import java.util.HashSet;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.Future;

import junit.framework.Test;
import junit.framework.TestSuite;

public class ExecutorCompletionService9Test extends JSR166TestCase {
    public static void main(String[] args) {
        main(suite(), args);
    }
    public static Test suite() {
        return new TestSuite(ExecutorCompletionService9Test.class);
    }

    void solveAll(Executor e,
                  Collection<Callable<Integer>> solvers)
        throws InterruptedException, ExecutionException {
        CompletionService<Integer> cs
            = new ExecutorCompletionService<>(e);
        solvers.forEach((solver) -> cs.submit(solver));
        for (int i = solvers.size(); i > 0; i--) {
            Integer r = cs.take().get();
            if (r != null)
                use(r);
        }
    }

    void solveAny(Executor e,
                  Collection<Callable<Integer>> solvers)
        throws InterruptedException {
        CompletionService<Integer> cs
            = new ExecutorCompletionService<>(e);
        int n = solvers.size();
        List<Future<Integer>> futures = new ArrayList<>(n);
        Integer result = null;
        try {
            solvers.forEach((solver) -> futures.add(cs.submit(solver)));
            for (int i = n; i > 0; i--) {
                try {
                    Integer r = cs.take().get();
                    if (r != null) {
                        result = r;
                        break;
                    }
                } catch (ExecutionException ignore) {}
            }
        } finally {
            futures.forEach((future) -> future.cancel(true));
        }

        if (result != null)
            use(result);
    }

    HashSet<Integer> results;

    void use(Integer x) {
        if (results == null) results = new HashSet<Integer>();
        results.add(x);
    }

    /**
     * The first "solvers" sample code in the class javadoc works.
     */
    public void testSolveAll()
        throws InterruptedException, ExecutionException {
        Set<Callable<Integer>> solvers = Set.of(
            () -> null,
            () -> 1,
            () -> 2,
            () -> 3,
            () -> null);
        solveAll(ForkJoinPool.commonPool(), solvers);
        assertEquals(Set.of(1, 2, 3), results);
    }

    /**
     * The second "solvers" sample code in the class javadoc works.
     */
    public void testSolveAny()
        throws InterruptedException {
        Set<Callable<Integer>> solvers = Set.of(
            () -> { throw new ArithmeticException(); },
            () -> null,
            () -> 1,
            () -> 2);
        solveAny(ForkJoinPool.commonPool(), solvers);
        assertEquals(1, results.size());
        Integer elt = results.iterator().next();
        assertTrue(elt.equals(1) || elt.equals(2));
    }

}
Revision:	1.2
Committed:	Sun May 22 15:29:32 2016 UTC (7 years, 11 months ago) by jsr166
Branch:	MAIN
Changes since 1.1:	+1 -3 lines
Log Message:	lint
#	User	Rev	Content
1	jsr166	1.1	/*
2			* Written by Doug Lea and Martin Buchholz with assistance from
3			* members of JCP JSR-166 Expert Group and released to the public
4			* domain, as explained at
5			* http://creativecommons.org/publicdomain/zero/1.0/
6			*/
7
8			import java.util.ArrayList;
9			import java.util.Collection;
10			import java.util.List;
11			import java.util.Set;
12			import java.util.HashSet;
13			import java.util.concurrent.Callable;
14			import java.util.concurrent.CompletionService;
15			import java.util.concurrent.ExecutionException;
16			import java.util.concurrent.ExecutorCompletionService;
17			import java.util.concurrent.Executor;
18			import java.util.concurrent.ExecutorService;
19			import java.util.concurrent.ForkJoinPool;
20			import java.util.concurrent.Future;
21
22			import junit.framework.Test;
23			import junit.framework.TestSuite;
24
25			public class ExecutorCompletionService9Test extends JSR166TestCase {
26			public static void main(String[] args) {
27			main(suite(), args);
28			}
29			public static Test suite() {
30			return new TestSuite(ExecutorCompletionService9Test.class);
31			}
32
33			void solveAll(Executor e,
34			Collection<Callable<Integer>> solvers)
35			throws InterruptedException, ExecutionException {
36			CompletionService<Integer> cs
37			= new ExecutorCompletionService<>(e);
38			solvers.forEach((solver) -> cs.submit(solver));
39			for (int i = solvers.size(); i > 0; i--) {
40			Integer r = cs.take().get();
41			if (r != null)
42			use(r);
43			}
44			}
45
46			void solveAny(Executor e,
47			Collection<Callable<Integer>> solvers)
48			throws InterruptedException {
49			CompletionService<Integer> cs
50			= new ExecutorCompletionService<>(e);
51			int n = solvers.size();
52			List<Future<Integer>> futures = new ArrayList<>(n);
53			Integer result = null;
54			try {
55			solvers.forEach((solver) -> futures.add(cs.submit(solver)));
56			for (int i = n; i > 0; i--) {
57			try {
58			Integer r = cs.take().get();
59			if (r != null) {
60			result = r;
61			break;
62			}
63			} catch (ExecutionException ignore) {}
64			}
65			} finally {
66			futures.forEach((future) -> future.cancel(true));
67			}
68
69			if (result != null)
70			use(result);
71			}
72
73			HashSet<Integer> results;
74
75			void use(Integer x) {
76			if (results == null) results = new HashSet<Integer>();
77			results.add(x);
78			}
79
80			/**
81			* The first "solvers" sample code in the class javadoc works.
82			*/
83			public void testSolveAll()
84			throws InterruptedException, ExecutionException {
85			Set<Callable<Integer>> solvers = Set.of(
86			() -> null,
87			() -> 1,
88			() -> 2,
89			() -> 3,
90			() -> null);
91			solveAll(ForkJoinPool.commonPool(), solvers);
92			assertEquals(Set.of(1, 2, 3), results);
93			}
94	jsr166	1.2
95	jsr166	1.1	/**
96			* The second "solvers" sample code in the class javadoc works.
97			*/
98			public void testSolveAny()
99			throws InterruptedException {
100			Set<Callable<Integer>> solvers = Set.of(
101			() -> { throw new ArithmeticException(); },
102			() -> null,
103			() -> 1,
104			() -> 2);
105			solveAny(ForkJoinPool.commonPool(), solvers);
106			assertEquals(1, results.size());
107			Integer elt = results.iterator().next();
108			assertTrue(elt.equals(1) \|\| elt.equals(2));
109			}
110
111			}