updated post review comments
This commit is contained in:
Anurag Goyal
parent
8054742acb
commit
fe53a23d41
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@ -1,6 +1,7 @@
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package com.baeldung.filechannel;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertNotNull;
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import java.io.ByteArrayOutputStream;
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import java.io.FileInputStream;
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@ -8,171 +9,194 @@ import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.nio.ByteBuffer;
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import java.nio.MappedByteBuffer;
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import java.nio.channels.FileChannel;
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import java.nio.channels.FileLock;
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import java.nio.channels.OverlappingFileLockException;
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import java.nio.charset.StandardCharsets;
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import org.junit.Test;
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public class FileChannelUnitTest {
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@Test
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public void givenFile_whenReadWithFileChannelUsingRandomAccessFile_thenCorrect() throws IOException {
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String expected_value = "Hello world";
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String file = "src/test/resources/test_read.in";
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RandomAccessFile reader = new RandomAccessFile(file, "r");
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FileChannel channel = reader.getChannel();
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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int bufferSize = 1024;
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if (bufferSize > channel.size()) {
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bufferSize = (int) channel.size();
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}
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ByteBuffer buff = ByteBuffer.allocate(bufferSize);
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@Test
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public void givenFile_whenReadWithFileChannelUsingRandomAccessFile_thenCorrect() throws IOException {
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String expected_value = "Hello world";
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String file = "src/test/resources/test_read.in";
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try (RandomAccessFile reader = new RandomAccessFile(file, "r");
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FileChannel channel = reader.getChannel();
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ByteArrayOutputStream out = new ByteArrayOutputStream();) {
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while (channel.read(buff) > 0) {
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if (buff.hasArray()) {
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out.write(buff.array(), 0, buff.position());
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buff.clear();
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}
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}
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int bufferSize = 1024;
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if (bufferSize > channel.size()) {
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bufferSize = (int) channel.size();
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}
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ByteBuffer buff = ByteBuffer.allocate(bufferSize);
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assertEquals(expected_value, new String(out.toByteArray(), StandardCharsets.UTF_8));
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out.close();
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channel.close();
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reader.close();
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}
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while (channel.read(buff) > 0) {
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if (buff.hasArray()) {
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out.write(buff.array(), 0, buff.position());
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buff.clear();
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}
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}
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@Test
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public void givenFile_whenReadWithFileChannelUsingFileInputStream_thenCorrect() throws IOException {
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String expected_value = "Hello world";
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String file = "src/test/resources/test_read.in";
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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FileInputStream fin = new FileInputStream(file);
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FileChannel channel = fin.getChannel();
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assertEquals(expected_value, new String(out.toByteArray(), StandardCharsets.UTF_8));
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}
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}
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int bufferSize = 1024;
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if (bufferSize > channel.size()) {
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bufferSize = (int) channel.size();
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}
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ByteBuffer buff = ByteBuffer.allocate(bufferSize);
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@Test
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public void givenFile_whenReadWithFileChannelUsingFileInputStream_thenCorrect() throws IOException {
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String expected_value = "Hello world";
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String file = "src/test/resources/test_read.in";
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while (channel.read(buff) > 0) {
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if (buff.hasArray()) {
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out.write(buff.array(), 0, buff.position());
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buff.clear();
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}
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}
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try (ByteArrayOutputStream out = new ByteArrayOutputStream();
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FileInputStream fin = new FileInputStream(file);
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FileChannel channel = fin.getChannel();) {
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assertEquals(expected_value, new String(out.toByteArray(), StandardCharsets.UTF_8));
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out.close();
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channel.close();
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fin.close();
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}
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int bufferSize = 1024;
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if (bufferSize > channel.size()) {
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bufferSize = (int) channel.size();
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}
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ByteBuffer buff = ByteBuffer.allocate(bufferSize);
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@Test
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public void whenWriteWithFileChannelUsingRandomAccessFile_thenCorrect() throws IOException {
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String input = "Hello world";
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String file = "src/test/resources/test_write_using_filechannel.txt";
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while (channel.read(buff) > 0) {
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if (buff.hasArray()) {
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out.write(buff.array(), 0, buff.position());
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buff.clear();
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}
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}
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RandomAccessFile writer = new RandomAccessFile(file, "rw");
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FileChannel channel = writer.getChannel();
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assertEquals(expected_value, new String(out.toByteArray(), StandardCharsets.UTF_8));
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ByteBuffer buff = ByteBuffer.wrap(input.getBytes());
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while (buff.hasRemaining()) {
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channel.write(buff);
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}
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channel.close();
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writer.close();
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}
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}
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@Test
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public void givenFile_whenReadAFileSectionIntoMemoryWithFileChannel_thenCorrect() throws IOException {
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String expected_value = "world";
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String file = "src/test/resources/test_read.in";
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// verify
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RandomAccessFile reader = new RandomAccessFile(file, "r");
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assertEquals(input, reader.readLine());
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reader.close();
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}
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try (RandomAccessFile reader = new RandomAccessFile(file, "r");
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FileChannel channel = reader.getChannel();
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ByteArrayOutputStream out = new ByteArrayOutputStream();) {
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@Test
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public void whenWriteWithFileChannelUsingFileOutputStream_thenCorrect() throws IOException {
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String input = "Hello world";
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String file = "src/test/resources/test_write_using_filechannel.txt";
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MappedByteBuffer buff = channel.map(FileChannel.MapMode.READ_ONLY, 6, 5);
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FileOutputStream fout = new FileOutputStream(file);
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FileChannel channel = fout.getChannel();
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if(buff.hasRemaining()) {
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byte[] data = new byte[buff.remaining()];
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buff.get(data);
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assertEquals(expected_value, new String(data, StandardCharsets.UTF_8));
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}
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}
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}
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@Test
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public void whenWriteWithFileChannelUsingRandomAccessFile_thenCorrect()
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throws IOException {
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String expected = "Hello world";
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String file = "src/test/resources/test_write_using_filechannel.txt";
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try (RandomAccessFile writer = new RandomAccessFile(file, "rw");
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FileChannel channel = writer.getChannel();){
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ByteBuffer buff = ByteBuffer.wrap("Hello world".getBytes(StandardCharsets.UTF_8));
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if (buff.hasRemaining()) {
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channel.write(buff);
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}
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// verify
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RandomAccessFile reader = new RandomAccessFile(file, "r");
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assertEquals(expected, reader.readLine());
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reader.close();
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}
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}
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@Test
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public void givenFile_whenWriteAFileUsingLockAFileSectionWithFileChannel_thenCorrect() throws IOException {
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String file = "src/test/resources/test_read.in";
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ByteBuffer buff = ByteBuffer.wrap(input.getBytes());
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while (buff.hasRemaining()) {
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channel.write(buff);
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}
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try (RandomAccessFile reader = new RandomAccessFile(file, "rw");
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FileChannel channel = reader.getChannel();
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FileLock fileLock = channel.tryLock(6, 5, Boolean.FALSE );){
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assertNotNull(fileLock);
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}catch(OverlappingFileLockException | IOException ex) {
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}
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}
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channel.close();
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fout.close();
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@Test
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public void givenFile_whenReadWithFileChannelGetPosition_thenCorrect() throws IOException {
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long expected_value = 11;
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String file = "src/test/resources/test_read.in";
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// verify
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RandomAccessFile reader = new RandomAccessFile(file, "r");
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assertEquals(input, reader.readLine());
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reader.close();
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}
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try (ByteArrayOutputStream out = new ByteArrayOutputStream();
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RandomAccessFile reader = new RandomAccessFile(file, "r");
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FileChannel channel = reader.getChannel();) {
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@Test
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public void givenFile_whenReadWithFileChannelGetPosition_thenCorrect() throws IOException {
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long expected_value = 11;
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String file = "src/test/resources/test_read.in";
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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RandomAccessFile reader = new RandomAccessFile(file, "r");
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FileChannel channel = reader.getChannel();
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int bufferSize = 1024;
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if (bufferSize > channel.size()) {
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bufferSize = (int) channel.size();
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}
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ByteBuffer buff = ByteBuffer.allocate(bufferSize);
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int bufferSize = 1024;
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if (bufferSize > channel.size()) {
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bufferSize = (int) channel.size();
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}
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ByteBuffer buff = ByteBuffer.allocate(bufferSize);
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while (channel.read(buff) > 0) {
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out.write(buff.array(), 0, buff.position());
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buff.clear();
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}
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while (channel.read(buff) > 0) {
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if (buff.hasArray()) {
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out.write(buff.array(), 0, buff.position());
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buff.clear();
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}
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}
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assertEquals(expected_value, channel.position());
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assertEquals(expected_value, channel.position());
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channel.position(4);
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assertEquals(4, channel.position());
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channel.position(4);
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assertEquals(4, channel.position());
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}
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}
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out.close();
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channel.close();
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reader.close();
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}
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@Test
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public void whenGetFileSize_thenCorrect() throws IOException {
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long expectedSize = 11;
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String file = "src/test/resources/test_read.in";
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try (RandomAccessFile reader = new RandomAccessFile(file, "r");
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FileChannel channel = reader.getChannel();) {
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@Test
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public void whenGetFileSize_thenCorrect() throws IOException {
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long expectedSize = 11;
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String file = "src/test/resources/test_read.in";
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RandomAccessFile reader = new RandomAccessFile(file, "r");
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FileChannel channel = reader.getChannel();
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long imageFileSize = channel.size();
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assertEquals(expectedSize, imageFileSize);
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}
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long imageFileSize = channel.size();
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assertEquals(expectedSize, imageFileSize);
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}
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channel.close();
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reader.close();
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}
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@Test
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public void whenTruncateFile_thenCorrect() throws IOException {
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long expectedSize = 5;
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String input = "this is a test input";
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String file = "src/test/resources/test_truncate.txt";
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@Test
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public void whenTruncateFile_thenCorrect() throws IOException {
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long expectedSize = 5;
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String input = "this is a test input";
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String file = "src/test/resources/test_truncate.txt";
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FileOutputStream fout = new FileOutputStream(file);
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FileChannel channel = fout.getChannel();
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FileOutputStream fout = new FileOutputStream(file);
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FileChannel channel = fout.getChannel();
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ByteBuffer buff = ByteBuffer.wrap(input.getBytes());
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channel.write(buff);
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buff.flip();
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ByteBuffer buff = ByteBuffer.wrap(input.getBytes());
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channel.write(buff);
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buff.flip();
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channel = channel.truncate(5);
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assertEquals(expectedSize, channel.size());
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channel = channel.truncate(5);
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assertEquals(expectedSize, channel.size());
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fout.close();
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channel.close();
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}
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fout.close();
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channel.close();
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}
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}
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