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/*
* Copyright (c) 2015, 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.
*
* 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.
*/
/*
* @test
* @run testng ConcurrentRemoveIf
* @bug 8078645
* @summary Test removeIf on views of concurrent maps
*/
import static org.testng.Assert.assertEquals;
import org.testng.annotations.AfterClass;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ConcurrentNavigableMap;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.function.Consumer;
import java.util.function.Supplier;
@Test
public class ConcurrentRemoveIf {
static final int K = 100;
static final int SIZE = 1000;
static final int HALF_SIZE = SIZE / 2;
@DataProvider()
public static Object[][] concurrentMapViewRemoveIfActions() {
List<Object[]> rows = new ArrayList<>();
// ConcurrentMap classes to test
Map<String, Supplier<ConcurrentMap<Integer, Integer>>> maps = new HashMap<>();
maps.put("ConcurrentHashMap", ConcurrentHashMap::new);
maps.put("ConcurrentSkipListMap", ConcurrentSkipListMap::new);
// ConcurrentMap actions
Map<String, Consumer<ConcurrentMap<Integer, Integer>>> actions = new HashMap<>();
actions.put(".entrySet().removeIf()", m -> m.entrySet().removeIf(e -> e.getValue() == 0));
actions.put(".values().removeIf()", m -> m.values().removeIf(v -> v == 0));
// ConcurrentNavigableMap actions
Map<String, Consumer<ConcurrentNavigableMap<Integer, Integer>>> navActions = new HashMap<>();
navActions.put(".headMap()/tailMap().entrySet().removeIf()",
m -> {
ConcurrentMap<Integer, Integer> left = m.headMap(HALF_SIZE, false);
ConcurrentMap<Integer, Integer> right = m.tailMap(HALF_SIZE, true);
left.entrySet().removeIf(e -> e.getValue() == 0);
right.entrySet().removeIf(e -> e.getValue() == 0);
});
navActions.put(".headMap()/tailMap().values().removeIf()",
m -> {
ConcurrentMap<Integer, Integer> left = m.headMap(HALF_SIZE, false);
ConcurrentMap<Integer, Integer> right = m.tailMap(HALF_SIZE, true);
left.values().removeIf(v -> v == 0);
right.values().removeIf(v -> v == 0);
});
navActions.put(".descendingMap().entrySet().removeIf()",
m -> {
ConcurrentMap<Integer, Integer> dm = m.descendingMap();
dm.entrySet().removeIf(e -> e.getValue() == 0);
});
navActions.put(".descendingMap().values().removeIf()",
m -> {
ConcurrentMap<Integer, Integer> dm = m.descendingMap();
dm.values().removeIf(v -> v == 0);
});
maps.forEach((mapDescription, sm) -> {
actions.forEach((actionDescription, action) -> {
rows.add(new Object[] {mapDescription + actionDescription, sm, action});
});
if (sm.get() instanceof ConcurrentNavigableMap) {
navActions.forEach((actionDescription, action) -> {
rows.add(new Object[] {mapDescription + actionDescription, sm, action});
});
}
});
return rows.toArray(new Object[0][]);
}
ExecutorService executorService = Executors.newCachedThreadPool();
@AfterClass
public void after() {
executorService.shutdown();
}
@Test(dataProvider = "concurrentMapViewRemoveIfActions")
public void testMap(String desc, Supplier<ConcurrentMap<Integer, Integer>> ms, Consumer<ConcurrentMap<Integer, Integer>> action)
throws InterruptedException {
for (int i = 0; i < K; i++) {
testMap(ms.get(), action);
}
}
private void testMap(ConcurrentMap<Integer, Integer> map, Consumer<ConcurrentMap<Integer, Integer>> action)
throws InterruptedException {
// put 0's
fillMap(map, 0);
// To start working simultaneously
CyclicBarrier threadStarted = new CyclicBarrier(2);
// This task puts 1's into map
CompletableFuture<Void> putter = CompletableFuture.runAsync(
awaitOn(threadStarted, () -> fillMap(map, 1)),
executorService);
// This task performs the map action to remove all 0's from map
CompletableFuture<Void> remover = CompletableFuture.runAsync(
awaitOn(threadStarted, () -> action.accept(map)),
executorService);
// Wait for both tasks to complete
CompletableFuture.allOf(putter, remover).join();
assertEquals(map.size(), SIZE, "Map size incorrect");
map.forEach((k, v) -> assertEquals(v, (Integer)1));
}
static void fillMap(ConcurrentMap<Integer, Integer> map, int value) {
for (int i = 0; i < SIZE; i++) {
map.put(i, value);
}
}
static Runnable awaitOn(CyclicBarrier threadStarted, Runnable r) {
return () -> {
try {
threadStarted.await();
}
catch (Exception e) {
throw new RuntimeException(e);
}
r.run();
};
}
}
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