Quellcode-Bibliothek

^© Kompilation durch diese Firma

[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]

Datei: FunctionalCMEs.java Sprache: JAVA

/*
* Copyright (c) 2015, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.  Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

import java.util.Arrays;
import java.util.ConcurrentModificationException;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.TreeMap;
import java.util.function.BiFunction;

import org.testng.annotations.Test;
import org.testng.annotations.DataProvider;

/**
* @test
* @bug 8071667
* @summary Ensure that ConcurrentModificationExceptions are thrown as specified from Map methods that accept Functions
* @author bchristi
* @build Defaults
* @run testng FunctionalCMEs
*/
public class FunctionalCMEs {
    static final String KEY = "key";

    @DataProvider(name = "Maps", parallel = true)
    private static Iterator<Object[]> makeMaps() {
        return Arrays.asList(
                // Test maps that CME
                new Object[]{new HashMap<>(), true},
                new Object[]{new Hashtable<>(), true},
                new Object[]{new LinkedHashMap<>(), true},
                new Object[]{new TreeMap<>(), true},
                // Test default Map methods - no CME
                new Object[]{new Defaults.ExtendsAbstractMap<>(), false}
        ).iterator();
    }

    @Test(dataProvider = "Maps")
    public void testComputeIfAbsent(Map<String,String> map, boolean expectCME) {
        checkCME(() -> {
            map.computeIfAbsent(KEY, k -> {
                putToForceRehash(map);
                return "computedValue";
            });
        }, expectCME);
    }

    @Test(dataProvider = "Maps")
    public void testCompute(Map<String,String> map, boolean expectCME) {
        checkCME(() -> {
            map.compute(KEY, mkBiFunc(map));
        }, expectCME);
    }

    @Test(dataProvider = "Maps")
    public void testComputeWithKeyMapped(Map<String,String> map, boolean expectCME) {
        map.put(KEY, "firstValue");
        checkCME(() -> {
            map.compute(KEY, mkBiFunc(map));
        }, expectCME);
    }

    @Test(dataProvider = "Maps")
    public void testComputeIfPresent(Map<String,String> map, boolean expectCME) {
        map.put(KEY, "firstValue");
        checkCME(() -> {
           map.computeIfPresent(KEY, mkBiFunc(map));
        }, expectCME);
    }

    @Test(dataProvider = "Maps")
    public void testMerge(Map<String,String> map, boolean expectCME) {
        map.put(KEY, "firstValue");
        checkCME(() -> {
            map.merge(KEY, "nextValue", mkBiFunc(map));
        }, expectCME);
    }

    @Test(dataProvider = "Maps")
    public void testForEach(Map<String,String> map, boolean ignored) {
        checkCME(() -> {
            map.put(KEY, "firstValue");
            putToForceRehash(map);
            map.forEach((k,v) -> {
                map.remove(KEY);
            });
        }, true);
    }

    @Test(dataProvider = "Maps")
    public void testReplaceAll(Map<String,String> map, boolean ignored) {
        checkCME(() -> {
            map.put(KEY, "firstValue");
            putToForceRehash(map);
            map.replaceAll((k,v) -> {
                map.remove(KEY);
                return "computedValue";
            });
        },true);
    }

    private static void checkCME(Runnable code, boolean expectCME) {
        try {
            code.run();
        } catch (ConcurrentModificationException cme) {
            if (expectCME) { return; } else { throw cme; }
        }
        if (expectCME) {
            throw new RuntimeException("Expected CME, but wasn't thrown");
        }
    }

    private static BiFunction<String,String,String> mkBiFunc(Map<String,String> map) {
        return (k,v) -> {
            putToForceRehash(map);
            return "computedValue";
        };
    }

    private static void putToForceRehash(Map<String,String> map) {
        for (int i = 0; i < 64; ++i) {
            map.put(i + "", "value");
        }
    }
}

¤ Dauer der Verarbeitung: 0.17 Sekunden (vorverarbeitet) ¤

Download des Quellennavigators
Download des sprechenden Kalenders
in der Quellcodebibliothek suchen

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.