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changes for review comments

This commit is contained in:
Anurag Goyal 2019-04-11 14:52:55 +05:30
parent fe53a23d41
commit d9540eff75
1 changed files with 105 additions and 134 deletions
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239
core-java-io/src/test/java/com/baeldung/filechannel/FileChannelUnitTest.java
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@ -21,10 +21,8 @@ public class FileChannelUnitTest {
@Test @Test
public void givenFile_whenReadWithFileChannelUsingRandomAccessFile_thenCorrect() throws IOException { public void givenFile_whenReadWithFileChannelUsingRandomAccessFile_thenCorrect() throws IOException {
String expected_value = "Hello world";
String file = "src/test/resources/test_read.in"; try (RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "r");
try (RandomAccessFile reader = new RandomAccessFile(file, "r");
FileChannel channel = reader.getChannel(); FileChannel channel = reader.getChannel();
ByteArrayOutputStream out = new ByteArrayOutputStream();) { ByteArrayOutputStream out = new ByteArrayOutputStream();) {
@ -34,130 +32,108 @@ public class FileChannelUnitTest {
} }
ByteBuffer buff = ByteBuffer.allocate(bufferSize); ByteBuffer buff = ByteBuffer.allocate(bufferSize);
while (channel.read(buff) > 0) {
if (buff.hasArray()) {
out.write(buff.array(), 0, buff.position());
buff.clear();
}
}
assertEquals(expected_value, new String(out.toByteArray(), StandardCharsets.UTF_8));
}
}
@Test
public void givenFile_whenReadWithFileChannelUsingFileInputStream_thenCorrect() throws IOException {
String expected_value = "Hello world";
String file = "src/test/resources/test_read.in";
try (ByteArrayOutputStream out = new ByteArrayOutputStream();
FileInputStream fin = new FileInputStream(file);
FileChannel channel = fin.getChannel();) {
int bufferSize = 1024;
if (bufferSize > channel.size()) {
bufferSize = (int) channel.size();
}
ByteBuffer buff = ByteBuffer.allocate(bufferSize);
while (channel.read(buff) > 0) {
if (buff.hasArray()) {
out.write(buff.array(), 0, buff.position());
buff.clear();
}
}
assertEquals(expected_value, new String(out.toByteArray(), StandardCharsets.UTF_8));
}
}
@Test
public void givenFile_whenReadAFileSectionIntoMemoryWithFileChannel_thenCorrect() throws IOException {
String expected_value = "world";
String file = "src/test/resources/test_read.in";
try (RandomAccessFile reader = new RandomAccessFile(file, "r");
FileChannel channel = reader.getChannel();
ByteArrayOutputStream out = new ByteArrayOutputStream();) {
MappedByteBuffer buff = channel.map(FileChannel.MapMode.READ_ONLY, 6, 5);
if(buff.hasRemaining()) {
byte[] data = new byte[buff.remaining()];
buff.get(data);
assertEquals(expected_value, new String(data, StandardCharsets.UTF_8));
}
}
}
@Test
public void whenWriteWithFileChannelUsingRandomAccessFile_thenCorrect()
throws IOException {
String expected = "Hello world";
String file = "src/test/resources/test_write_using_filechannel.txt";
try (RandomAccessFile writer = new RandomAccessFile(file, "rw");
FileChannel channel = writer.getChannel();){
ByteBuffer buff = ByteBuffer.wrap("Hello world".getBytes(StandardCharsets.UTF_8));
if (buff.hasRemaining()) {
channel.write(buff);
}
// verify
RandomAccessFile reader = new RandomAccessFile(file, "r");
assertEquals(expected, reader.readLine());
reader.close();
}
}
@Test
public void givenFile_whenWriteAFileUsingLockAFileSectionWithFileChannel_thenCorrect() throws IOException {
String file = "src/test/resources/test_read.in";
try (RandomAccessFile reader = new RandomAccessFile(file, "rw");
FileChannel channel = reader.getChannel();
FileLock fileLock = channel.tryLock(6, 5, Boolean.FALSE );){
assertNotNull(fileLock);
}catch(OverlappingFileLockException | IOException ex) {
}
}
@Test
public void givenFile_whenReadWithFileChannelGetPosition_thenCorrect() throws IOException {
long expected_value = 11;
String file = "src/test/resources/test_read.in";
try (ByteArrayOutputStream out = new ByteArrayOutputStream();
RandomAccessFile reader = new RandomAccessFile(file, "r");
FileChannel channel = reader.getChannel();) {
int bufferSize = 1024;
if (bufferSize > channel.size()) {
bufferSize = (int) channel.size();
}
ByteBuffer buff = ByteBuffer.allocate(bufferSize);
while (channel.read(buff) > 0) { while (channel.read(buff) > 0) {
out.write(buff.array(), 0, buff.position()); out.write(buff.array(), 0, buff.position());
buff.clear(); buff.clear();
} }
assertEquals(expected_value, channel.position()); assertEquals("Hello world", new String(out.toByteArray(), StandardCharsets.UTF_8));
}
}
@Test
public void givenFile_whenReadWithFileChannelUsingFileInputStream_thenCorrect() throws IOException {
try (ByteArrayOutputStream out = new ByteArrayOutputStream();
FileInputStream fin = new FileInputStream("src/test/resources/test_read.in");
FileChannel channel = fin.getChannel();) {
int bufferSize = 1024;
if (bufferSize > channel.size()) {
bufferSize = (int) channel.size();
}
ByteBuffer buff = ByteBuffer.allocate(bufferSize);
while (channel.read(buff) > 0) {
out.write(buff.array(), 0, buff.position());
buff.clear();
}
assertEquals("Hello world", new String(out.toByteArray(), StandardCharsets.UTF_8));
}
}
@Test
public void givenFile_whenReadAFileSectionIntoMemoryWithFileChannel_thenCorrect() throws IOException {
try (RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "r");
FileChannel channel = reader.getChannel();
ByteArrayOutputStream out = new ByteArrayOutputStream();) {
MappedByteBuffer buff = channel.map(FileChannel.MapMode.READ_ONLY, 6, 5);
if (buff.hasRemaining()) {
byte[] data = new byte[buff.remaining()];
buff.get(data);
assertEquals("world", new String(data, StandardCharsets.UTF_8));
}
}
}
@Test
public void whenWriteWithFileChannelUsingRandomAccessFile_thenCorrect() throws IOException {
String file = "src/test/resources/test_write_using_filechannel.txt";
try (RandomAccessFile writer = new RandomAccessFile(file, "rw");
FileChannel channel = writer.getChannel();) {
ByteBuffer buff = ByteBuffer.wrap("Hello world".getBytes(StandardCharsets.UTF_8));
if (buff.hasRemaining()) {
channel.write(buff);
}
// verify
RandomAccessFile reader = new RandomAccessFile(file, "r");
assertEquals("Hello world", reader.readLine());
reader.close();
}
}
@Test
public void givenFile_whenWriteAFileUsingLockAFileSectionWithFileChannel_thenCorrect() throws IOException {
try (RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "rw");
FileChannel channel = reader.getChannel();
FileLock fileLock = channel.tryLock(6, 5, Boolean.FALSE);) {
assertNotNull(fileLock);
} catch (OverlappingFileLockException | IOException ex) {
}
}
@Test
public void givenFile_whenReadWithFileChannelGetPosition_thenCorrect() throws IOException {
try (ByteArrayOutputStream out = new ByteArrayOutputStream();
RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "r");
FileChannel channel = reader.getChannel();) {
int bufferSize = 1024;
if (bufferSize > channel.size()) {
bufferSize = (int) channel.size();
}
ByteBuffer buff = ByteBuffer.allocate(bufferSize);
while (channel.read(buff) > 0) {
out.write(buff.array(), 0, buff.position());
buff.clear();
}
assertEquals(11, channel.position());
channel.position(4); channel.position(4);
assertEquals(4, channel.position()); assertEquals(4, channel.position());
@ -165,28 +141,23 @@ public class FileChannelUnitTest {
} }
} }
@Test @Test
public void whenGetFileSize_thenCorrect() throws IOException { public void whenGetFileSize_thenCorrect() throws IOException {
long expectedSize = 11;
String file = "src/test/resources/test_read.in"; try (RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "r");
FileChannel channel = reader.getChannel();) {
try (RandomAccessFile reader = new RandomAccessFile(file, "r");
FileChannel channel = reader.getChannel();) {
long imageFileSize = channel.size(); long imageFileSize = channel.size();
assertEquals(expectedSize, imageFileSize); assertEquals(11, imageFileSize);
} }
} }
@Test @Test
public void whenTruncateFile_thenCorrect() throws IOException { public void whenTruncateFile_thenCorrect() throws IOException {
long expectedSize = 5;
String input = "this is a test input"; String input = "this is a test input";
String file = "src/test/resources/test_truncate.txt";
FileOutputStream fout = new FileOutputStream(file); FileOutputStream fout = new FileOutputStream("src/test/resources/test_truncate.txt");
FileChannel channel = fout.getChannel(); FileChannel channel = fout.getChannel();
ByteBuffer buff = ByteBuffer.wrap(input.getBytes()); ByteBuffer buff = ByteBuffer.wrap(input.getBytes());
@ -194,7 +165,7 @@ public class FileChannelUnitTest {
buff.flip(); buff.flip();
channel = channel.truncate(5); channel = channel.truncate(5);
assertEquals(expectedSize, channel.size()); assertEquals(5, channel.size());
fout.close(); fout.close();
channel.close(); channel.close();