/*
* Copyright (C) 2012, 2016 higherfrequencytrading.com
* Copyright (C) 2016 Roman Leventov
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package net.openhft.chronicle.map;
import net.openhft.chronicle.core.values.IntValue;
import net.openhft.chronicle.values.Values;
import org.junit.Test;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import static java.nio.ByteOrder.LITTLE_ENDIAN;
import static net.openhft.chronicle.algo.hashing.LongHashFunction.xx_r39;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
public class TrickyContextCasesTest {
@Test(expected = IllegalStateException.class)
public void nestedContextsSameKeyTest() {
ChronicleMap<Integer, IntValue> map = ChronicleMapBuilder
.of(Integer.class, IntValue.class)
.entries(1).create();
IntValue v = Values.newHeapInstance(IntValue.class);
v.setValue(2);
map.put(1, v);
try (ExternalMapQueryContext<Integer, IntValue, ?> q = map.queryContext(1)) {
q.writeLock().lock();
// assume the value is 2
IntValue v2 = q.entry().value().get();
// this call should throw ISE, as accessing the key 1 in a nested context, but if not...
map.remove(1);
v.setValue(3);
map.put(2, v);
// prints 3
System.out.println(v2.getValue());
}
}
@Test(expected = Exception.class)
public void testPutShouldBeWriteLocked() throws ExecutionException, InterruptedException {
ChronicleMap<Integer, byte[]> map = ChronicleMapBuilder
.of(Integer.class, byte[].class)
.averageValue(new byte[1])
.entries(100).actualSegments(1).create();
map.put(1, new byte[] {1});
map.put(2, new byte[] {2});
try (ExternalMapQueryContext<Integer, byte[], ?> q = map.queryContext(1)) {
MapEntry<Integer, byte[]> entry = q.entry(); // acquires read lock implicitly
assertNotNull(entry);
Executors.newFixedThreadPool(1).submit(() -> {
// this call should try to acquire write lock, that should lead to dead lock
// but if not...
// relocates the entry for the key 1 after the entry for 2, under update lock
map.put(1, new byte[] {1, 2, 3, 4, 5});
// puts the entry for 3 at the place of the entry for the key 1, under update lock
map.put(3, new byte[] {3});
}).get();
// prints [3]
System.out.println(Arrays.toString(entry.value().get()));
}
}
@Test
public void testHashCollision() {
try (ChronicleMap<ByteBuffer, Integer> map = ChronicleMap
.of(ByteBuffer.class, Integer.class)
.constantKeySizeBySample(ByteBuffer.allocate(128))
.entries(2)
.create()) {
ByteBuffer key1 = ByteBuffer.allocate(128).order(LITTLE_ENDIAN);
key1.putLong(0, 1);
key1.putLong(32, 2);
ByteBuffer key2 = ByteBuffer.allocate(128).order(LITTLE_ENDIAN);
key2.putLong(0, 1 + 0xBA79078168D4BAFL);
key2.putLong(32, 2 + 0x9C90005B80000000L);
ByteBuffer key3 = ByteBuffer.allocate(128).order(LITTLE_ENDIAN);
key3.putLong(0, 1 + 0xBA79078168D4BAFL * 2);
key3.putLong(32, 2 + 0x9C90005B80000000L * 2);
assertEquals(xx_r39().hashBytes(key1), xx_r39().hashBytes(key2));
assertEquals(xx_r39().hashBytes(key1), xx_r39().hashBytes(key3));
try (ExternalMapQueryContext<ByteBuffer, Integer, ?> c1 = map.queryContext(key1)) {
c1.writeLock().lock();
c1.insert(c1.absentEntry(), c1.wrapValueAsData(1));
try (ExternalMapQueryContext<ByteBuffer, Integer, ?> c2 = map.queryContext(key2)) {
c2.writeLock().lock();
c2.insert(c2.absentEntry(), c2.wrapValueAsData(2));
c1.remove(c1.entry());
map.put(key3, 3);
c2.replaceValue(c2.entry(), c2.wrapValueAsData(22));
}
}
assertEquals(2, map.size());
assertEquals((Integer) 22, map.get(key2));
assertEquals((Integer) 3, map.get(key3));
}
}
}