/**
* Copyright (c) 2012, University of Konstanz, Distributed Systems Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the University of Konstanz nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.jscsi.initiator.devices;
import static org.junit.Assert.assertEquals;
import java.util.Random;
import org.junit.After;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;
@Ignore("Lack of testembed, removing")
public class PrefetchDeviceTest {
/** previous Target_Name - "disk6" */
private static final String TARGET_NAME = "testing-xen2-disk1";
private static PrefetchDevice device;
/* Byte arrays (for all blocksizes) which are written to the targets. */
private final byte[] testDataBlock8kb;
private final byte[] testDataBlock128kb;
Random randomGenerator;
// ---------------------------------------------------------------------------
// ---------------------------------------------------------------------------
public PrefetchDeviceTest() {
// create byte arrays with random values for all blocksizes.
randomGenerator = new Random(System.currentTimeMillis());
testDataBlock8kb = new byte[8 * 1024];
randomGenerator.nextBytes(testDataBlock8kb);
testDataBlock128kb = new byte[128 * 1024];
randomGenerator.nextBytes(testDataBlock128kb);
}
@Before
public final void setUp() throws Exception {
device = new PrefetchDevice(new JSCSIDevice(TARGET_NAME));
device.open();
}
@After
public final void tearDown() throws Exception {
device.close();
}
/**
* Test prefetching with 8kb blocks.
*
* @throws Exception
* These should never be thrown.
*/
@Test
public final void testReadWrite8kb() throws Exception {
int prefetchLength = device.getPrefetchLength() + 2;
int blockFactor = testDataBlock8kb.length / device.getBlockSize();
long address = 0;
for (int i = 0; i < prefetchLength; i++) {
device.write((address + i * blockFactor), testDataBlock8kb);
}
for (int j = 0; j < prefetchLength; j++) {
byte[] result = new byte[testDataBlock8kb.length];
device.read((address + j * blockFactor), result);
for (int i = 0; i < testDataBlock8kb.length; i++) {
assertEquals(testDataBlock8kb[i], result[i]);
}
}
}
/**
* Test reverse prefetching with 8kb blocks.
*
* @throws Exception
* These should never be thrown.
*/
@Test
public final void testReverseReadWrite8kb() throws Exception {
int prefetchLength = device.getPrefetchLength() + 2;
int blockFactor = testDataBlock8kb.length / device.getBlockSize();
long address = (prefetchLength - 1) * (blockFactor);
for (int i = 0; i < prefetchLength; i++) {
device.write((address - i * blockFactor), testDataBlock8kb);
}
for (int j = 0; j < prefetchLength; j++) {
byte[] result = new byte[testDataBlock8kb.length];
device.read((address - j * blockFactor), result);
for (int i = 0; i < testDataBlock8kb.length; i++) {
assertEquals(testDataBlock8kb[i], result[i]);
}
}
}
/**
* Test prefetching with 128kb blocks.
*
* @throws Exception
* These should never be thrown.
*/
@Test
public final void testReadWriteBeginning128kb() throws Exception {
int prefetchLength = device.getPrefetchLength();
int blockFactor = testDataBlock128kb.length / device.getBlockSize();
long address = 0;
for (int i = 0; i < prefetchLength; i++) {
device.write(address + i * blockFactor, testDataBlock128kb);
}
for (int j = 0; j < prefetchLength; j++) {
byte[] result = new byte[testDataBlock128kb.length];
device.read(address + j * blockFactor, result);
for (int i = 0; i < testDataBlock128kb.length; i++) {
assertEquals(result[i], testDataBlock128kb[i]);
}
}
}
/**
* Test reverse prefetching with 128kb blocks.
*
* @throws Exception
* These should never be thrown.
*/
@Test
public final void testReverseReadWrite128kb() throws Exception {
int prefetchLength = device.getPrefetchLength() + 2;
int blockFactor = testDataBlock128kb.length / device.getBlockSize();
long address = (prefetchLength - 1) * (blockFactor);
for (int i = 0; i < prefetchLength; i++) {
device.write((address - i * blockFactor), testDataBlock128kb);
}
for (int j = 0; j < prefetchLength; j++) {
byte[] result = new byte[testDataBlock128kb.length];
device.read((address - j * blockFactor), result);
for (int i = 0; i < testDataBlock128kb.length; i++) {
assertEquals(testDataBlock128kb[i], result[i]);
}
}
}
}