/*
* Copyright (c) [2016] [ <ether.camp> ]
* This file is part of the ethereumJ library.
*
* The ethereumJ library 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, or
* (at your option) any later version.
*
* The ethereumJ library 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 the ethereumJ library. If not, see <http://www.gnu.org/licenses/>.
*/
package org.ethereum.datasource;
import org.ethereum.datasource.inmem.HashMapDB;
import org.ethereum.vm.DataWord;
import org.junit.Test;
import org.spongycastle.util.encoders.Hex;
import static org.ethereum.crypto.HashUtil.sha3;
import static org.ethereum.util.ByteUtil.longToBytes;
import static org.junit.Assert.*;
/**
* Testing {@link ReadCache}
*/
public class ReadCacheTest {
private byte[] intToKey(int i) {
return sha3(longToBytes(i));
}
private byte[] intToValue(int i) {
return (new DataWord(i)).getData();
}
private String str(Object obj) {
if (obj == null) return null;
return Hex.toHexString((byte[]) obj);
}
@Test
public void test1() {
Source<byte[], byte[]> src = new HashMapDB<>();
ReadCache<byte[], byte[]> readCache = new ReadCache.BytesKey<>(src);
for (int i = 0; i < 10_000; ++i) {
src.put(intToKey(i), intToValue(i));
}
// Nothing is cached
assertNull(readCache.getCached(intToKey(0)));
assertNull(readCache.getCached(intToKey(9_999)));
for (int i = 0; i < 10_000; ++i) {
readCache.get(intToKey(i));
}
// Everything is cached
assertEquals(str(intToValue(0)), str(readCache.getCached(intToKey(0)).value()));
assertEquals(str(intToValue(9_999)), str(readCache.getCached(intToKey(9_999)).value()));
// Source changes doesn't affect cache
src.delete(intToKey(13));
assertEquals(str(intToValue(13)), str(readCache.getCached(intToKey(13)).value()));
// Flush is not implemented
assertFalse(readCache.flush());
}
@Test
public void testMaxCapacity() {
Source<byte[], byte[]> src = new HashMapDB<>();
ReadCache<byte[], byte[]> readCache = new ReadCache.BytesKey<>(src).withMaxCapacity(100);
for (int i = 0; i < 10_000; ++i) {
src.put(intToKey(i), intToValue(i));
readCache.get(intToKey(i));
}
// Only 100 latest are cached
assertNull(readCache.getCached(intToKey(0)));
assertEquals(str(intToValue(0)), str(readCache.get(intToKey(0))));
assertEquals(str(intToValue(0)), str(readCache.getCached(intToKey(0)).value()));
assertEquals(str(intToValue(9_999)), str(readCache.getCached(intToKey(9_999)).value()));
// 99_01 - 99_99 and 0 (totally 100)
assertEquals(str(intToValue(9_901)), str(readCache.getCached(intToKey(9_901)).value()));
assertNull(readCache.getCached(intToKey(9_900)));
}
}