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AllocateDirectWritableMapMemoryTest.java
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AllocateDirectWritableMapMemoryTest.java
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/*
* Copyright 2017, Yahoo! Inc. Licensed under the terms of the
* Apache License 2.0. See LICENSE file at the project root for terms.
*/
package com.yahoo.memory;
import static com.yahoo.memory.AllocateDirectMap.isFileReadOnly;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertTrue;
import static org.testng.Assert.fail;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.nio.ByteOrder;
import java.nio.file.Files;
import java.nio.file.attribute.PosixFilePermissions;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;
public class AllocateDirectWritableMapMemoryTest {
@BeforeClass
public void setReadOnly() {
File file =
new File(getClass().getClassLoader().getResource("GettysburgAddress.txt").getFile());
try {
Files.setPosixFilePermissions(file.toPath(), PosixFilePermissions.fromString("rw-r--r--"));
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Test
public void simpleMap() throws Exception {
File file =
new File(getClass().getClassLoader().getResource("GettysburgAddress.txt").getFile());
try (MapHandle h = Memory.map(file); WritableMapHandle wh = (WritableMapHandle) h) {
Memory mem = h.get();
byte[] bytes = new byte[(int)mem.getCapacity()];
mem.getByteArray(0, bytes, 0, bytes.length);
String text = new String(bytes, UTF_8);
println(text);
try {
wh.force();
fail();
} catch (ReadOnlyException e) {
//OK
}
}
}
@Test
public void copyOffHeapToMemoryMappedFile() throws Exception {
long bytes = 1L << 10; //small for unit tests. Make it larger than 2GB if you like.
long longs = bytes >>> 3;
File file = new File("TestFile.bin");
if (file.exists()) {
try {
java.nio.file.Files.delete(file.toPath());
} catch (IOException e) {
throw new RuntimeException(e);
}
}
assertTrue(file.createNewFile());
assertTrue (file.setWritable(true, false)); //writable=true, ownerOnly=false
assertTrue (file.isFile());
file.deleteOnExit(); //comment out if you want to examine the file.
try (
WritableMapHandle dstHandle
= WritableMemory.map(file, 0, bytes, ByteOrder.nativeOrder());
WritableHandle srcHandle = WritableMemory.allocateDirect(bytes)) {
WritableMemory dstMem = dstHandle.get();
WritableMemory srcMem = srcHandle.get();
for (long i = 0; i < (longs); i++) {
srcMem.putLong(i << 3, i); //load source with consecutive longs
}
srcMem.copyTo(0, dstMem, 0, srcMem.getCapacity()); //off-heap to off-heap copy
dstHandle.force(); //push any remaining to the file
//check end value
assertEquals(dstMem.getLong((longs - 1L) << 3), longs - 1L);
}
}
@Test
public void checkNonNativeFile() throws IOException {
File file = new File("TestFile2.bin");
if (file.exists()) {
try {
java.nio.file.Files.delete(file.toPath());
} catch (IOException e) {
throw new RuntimeException(e);
}
}
assertTrue(file.createNewFile());
assertTrue(file.setWritable(true, false)); //writable=true, ownerOnly=false
assertTrue(file.isFile());
file.deleteOnExit(); //comment out if you want to examine the file.
final long bytes = 8;
try (WritableMapHandle h = WritableMemory.map(file, 0L, bytes, Util.nonNativeOrder)) {
WritableMemory wmem = h.get();
wmem.putChar(0, (char) 1);
assertEquals(wmem.getByte(1), (byte) 1);
}
}
@Test(expectedExceptions = RuntimeException.class)
public void testMapException() throws IOException {
File dummy = createFile("dummy.txt", ""); //zero length
//throws java.lang.reflect.InvocationTargetException
Memory.map(dummy, 0, dummy.length(), ByteOrder.nativeOrder());
}
@Test(expectedExceptions = ReadOnlyException.class)
public void simpleMap2() throws IOException {
File file =
new File(getClass().getClassLoader().getResource("GettysburgAddress.txt").getFile());
boolean ro = isFileReadOnly(file);
assertTrue(ro);
try (WritableMapHandle rh = WritableMemory.map(file)) {
//
}
}
@Test(expectedExceptions = IllegalArgumentException.class)
public void checkOverLength() {
File file =
new File(getClass().getClassLoader().getResource("GettysburgAddress.txt").getFile());
try (WritableMapHandle rh = WritableMemory.map(file, 0, 1 << 20, Util.nativeOrder)) {
//
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Test
public void testForce() throws Exception {
String origStr = "Corectng spellng mistks";
File origFile = createFile("force_original.txt", origStr); //23
assertTrue(origFile.setWritable(true, false));
long origBytes = origFile.length();
String correctStr = "Correcting spelling mistakes"; //28
byte[] correctByteArr = correctStr.getBytes(UTF_8);
long corrBytes = correctByteArr.length;
try (MapHandle rh = Memory.map(origFile, 0, origBytes, ByteOrder.nativeOrder())) {
Memory map = rh.get();
rh.load();
assertTrue(rh.isLoaded());
//confirm orig string
byte[] buf = new byte[(int)origBytes];
map.getByteArray(0, buf, 0, (int)origBytes);
String bufStr = new String(buf, UTF_8);
assertEquals(bufStr, origStr);
}
try (WritableMapHandle wrh = WritableMemory.map(origFile, 0, corrBytes,
ByteOrder.nativeOrder())) {
WritableMemory wMap = wrh.get();
wrh.load();
assertTrue(wrh.isLoaded());
// over write content
wMap.putByteArray(0, correctByteArr, 0, (int)corrBytes);
wrh.force();
//confirm correct string
byte[] buf = new byte[(int)corrBytes];
wMap.getByteArray(0, buf, 0, (int)corrBytes);
String bufStr = new String(buf, UTF_8);
assertEquals(bufStr, correctStr);
}
}
private static File createFile(String fileName, String text) throws FileNotFoundException {
File file = new File(fileName);
file.deleteOnExit();
PrintWriter writer;
try {
writer = new PrintWriter(file, UTF_8.name());
writer.print(text);
writer.close();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return file;
}
@Test
public void checkExplicitClose() throws Exception {
File file =
new File(getClass().getClassLoader().getResource("GettysburgAddress.txt").getFile());
try (MapHandle wmh = Memory.map(file)) {
wmh.close(); //explicit close. Does the work of closing
wmh.dirMap.close(); //redundant
} //end of scope call to Cleaner/Deallocator also will be redundant
}
@AfterClass
public void checkMapCounter() {
final long count = BaseState.getCurrentDirectMemoryMapAllocations();
if (count != 0) {
println(""+count);
fail();
}
}
@Test
public void printlnTest() {
println("PRINTING: "+this.getClass().getName());
}
/**
* @param s String to print
*/
static void println(final String s) {
//System.out.println(s);
}
}