/*
* 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.hash.impl;
import net.openhft.chronicle.core.OS;
public final class IntCompactOffHeapLinearHashTable extends CompactOffHeapLinearHashTable {
private static final long SCALE = 4L;
/**
* Must not store {@code h} in a field, to avoid memory leaks.
*
* @see net.openhft.chronicle.hash.impl.stage.hash.Chaining#initMap
*/
IntCompactOffHeapLinearHashTable(VanillaChronicleHash h) {
super(h);
}
@Override
long indexToPos(long index) {
return index * SCALE;
}
@Override
public long step(long pos) {
return (pos + SCALE) & capacityMask2;
}
@Override
public long stepBack(long pos) {
return (pos - SCALE) & capacityMask2;
}
@Override
public long readEntry(long addr, long pos) {
return OS.memory().readInt(addr + pos);
}
@Override
public long readEntryVolatile(long addr, long pos) {
return OS.memory().readVolatileInt(addr + pos);
}
@Override
public void writeEntryVolatile(long addr, long pos, long key, long value) {
OS.memory().writeVolatileInt(null, addr + pos, (int) entry(key, value));
}
@Override
public void writeEntry(long addr, long pos, long newEntry) {
OS.memory().writeInt(addr + pos, (int) newEntry);
}
@Override
public void clearEntry(long addr, long pos) {
OS.memory().writeInt(addr + pos, 0);
}
}