Example usage for org.apache.cassandra.io.util RandomAccessReader getFilePointer

Introduction

In this page you can find the example usage for org.apache.cassandra.io.util RandomAccessReader getFilePointer.

Prototype

@Override
    public long getFilePointer() 

Source Link

Usage

From source file:com.fullcontact.cassandra.io.util.BufferedRandomAccessFileTest.java

License:Apache License

@Test
public void testReadAndWrite() throws Exception {
    SequentialWriter w = createTempFile("braf");

    // writting string of data to the file
    byte[] data = "Hello".getBytes();
    w.write(data);/*from   w  w w . ja va2s . c o  m*/
    assertEquals(data.length, w.length());
    assertEquals(data.length, w.getFilePointer());

    w.sync();

    // reading small amount of data from file, this is handled by initial buffer
    RandomAccessReader r = RandomAccessReader.open(w, fs);

    byte[] buffer = new byte[data.length];
    assertEquals(data.length, r.read(buffer));
    assertTrue(Arrays.equals(buffer, data)); // we read exactly what we wrote
    assertEquals(r.read(), -1); // nothing more to read EOF
    assert r.bytesRemaining() == 0 && r.isEOF();

    r.close();

    // writing buffer bigger than page size, which will trigger reBuffer()
    byte[] bigData = new byte[RandomAccessReader.DEFAULT_BUFFER_SIZE + 10];

    for (int i = 0; i < bigData.length; i++)
        bigData[i] = 'd';

    long initialPosition = w.getFilePointer();
    w.write(bigData); // writing data
    assertEquals(w.getFilePointer(), initialPosition + bigData.length);
    assertEquals(w.length(), initialPosition + bigData.length); // file size should equals to last position

    w.sync();

    r = RandomAccessReader.open(w, fs); // re-opening file in read-only mode

    // reading written buffer
    r.seek(initialPosition); // back to initial (before write) position
    data = new byte[bigData.length];
    long sizeRead = 0;
    for (int i = 0; i < data.length; i++) {
        data[i] = (byte) r.read();
        sizeRead++;
    }

    assertEquals(sizeRead, data.length); // read exactly data.length bytes
    assertEquals(r.getFilePointer(), initialPosition + data.length);
    assertEquals(r.length(), initialPosition + bigData.length);
    assertTrue(Arrays.equals(bigData, data));
    assertTrue(r.bytesRemaining() == 0 && r.isEOF()); // we are at the of the file

    // test readBytes(int) method
    r.seek(0);
    ByteBuffer fileContent = r.readBytes((int) w.length());
    assertEquals(fileContent.limit(), w.length());
    assert ByteBufferUtil.string(fileContent).equals("Hello" + new String(bigData));

    // read the same buffer but using readFully(int)
    data = new byte[bigData.length];
    r.seek(initialPosition);
    r.readFully(data);
    assert r.bytesRemaining() == 0 && r.isEOF(); // we should be at EOF
    assertTrue(Arrays.equals(bigData, data));

    // try to read past mark (all methods should return -1)
    data = new byte[10];
    assertEquals(r.read(), -1);
    assertEquals(r.read(data), -1);
    assertEquals(r.read(data, 0, data.length), -1);

    // test read(byte[], int, int)
    r.seek(0);
    data = new byte[20];
    assertEquals(15, r.read(data, 0, 15));
    assertTrue(new String(data).contains("Hellodddddddddd"));
    for (int i = 16; i < data.length; i++) {
        assert data[i] == 0;
    }

    w.close();
    r.close();
}

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From source file:com.fullcontact.cassandra.io.util.BufferedRandomAccessFileTest.java

License:Apache License

@Test
public void testSeek() throws Exception {
    SequentialWriter w = createTempFile("brafSeek");
    byte[] data = generateByteArray(RandomAccessReader.DEFAULT_BUFFER_SIZE + 20);
    w.write(data);//from  w w  w. j  a v  a 2s  . com
    w.close();

    final RandomAccessReader file = RandomAccessReader.open(w, fs);

    file.seek(0);
    assertEquals(file.getFilePointer(), 0);
    assertEquals(file.bytesRemaining(), file.length());

    file.seek(20);
    assertEquals(file.getFilePointer(), 20);
    assertEquals(file.bytesRemaining(), file.length() - 20);

    // trying to seek past the end of the file should produce EOFException
    expectException(new Callable<Object>() {
        public Object call() {
            file.seek(file.length() + 30);
            return null;
        }
    }, IllegalArgumentException.class);

    expectException(new Callable<Object>() {
        public Object call() throws IOException {
            file.seek(-1);
            return null;
        }
    }, IllegalArgumentException.class); // throws IllegalArgumentException

    file.close();
}

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From source file:com.fullcontact.cassandra.io.util.BufferedRandomAccessFileTest.java

License:Apache License

@Test
public void testSkipBytes() throws IOException {
    SequentialWriter w = createTempFile("brafSkipBytes");
    w.write(generateByteArray(RandomAccessReader.DEFAULT_BUFFER_SIZE * 2));
    w.close();//from  w ww. j  av a 2  s. c o m

    RandomAccessReader file = RandomAccessReader.open(w, fs);

    file.seek(0); // back to the beginning of the file
    assertEquals(file.skipBytes(10), 10);
    assertEquals(file.bytesRemaining(), file.length() - 10);

    int initialPosition = (int) file.getFilePointer();
    // can't skip more than file size
    assertEquals(file.skipBytes((int) file.length() + 10), file.length() - initialPosition);
    assertEquals(file.getFilePointer(), file.length());
    assert file.bytesRemaining() == 0 && file.isEOF();

    file.seek(0);

    // skipping negative amount should return 0
    assertEquals(file.skipBytes(-1000), 0);
    assertEquals(file.getFilePointer(), 0);
    assertEquals(file.bytesRemaining(), file.length());

    file.close();
}

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From source file:com.fullcontact.cassandra.io.util.BufferedRandomAccessFileTest.java

License:Apache License

@Test
public void testGetFilePointer() throws IOException {
    final SequentialWriter w = createTempFile("brafGetFilePointer");

    assertEquals(w.getFilePointer(), 0); // initial position should be 0

    w.write(generateByteArray(20));//from w  ww.j a va  2 s .c  o m
    assertEquals(w.getFilePointer(), 20); // position 20 after writing 20 bytes

    w.sync();

    RandomAccessReader r = RandomAccessReader.open(w, fs);

    // position should change after skip bytes
    r.seek(0);
    r.skipBytes(15);
    assertEquals(r.getFilePointer(), 15);

    r.read();
    assertEquals(r.getFilePointer(), 16);
    r.read(new byte[4]);
    assertEquals(r.getFilePointer(), 20);

    w.close();
    r.close();
}

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From source file:com.fullcontact.cassandra.io.util.BufferedRandomAccessFileTest.java

License:Apache License

@Test
public void testReadOnly() throws IOException {
    SequentialWriter file = createTempFile("brafReadOnlyTest");

    byte[] data = new byte[20];
    for (int i = 0; i < data.length; i++)
        data[i] = 'c';

    file.write(data);/*from   www  .ja v  a2 s  .  c om*/
    file.sync(); // flushing file to the disk

    // read-only copy of the file, with fixed file length
    final RandomAccessReader copy = RandomAccessReader.open(new Path(file.getPath()), fs);

    copy.seek(copy.length());
    assertTrue(copy.bytesRemaining() == 0 && copy.isEOF());

    // can't seek past the end of the file for read-only files
    expectException(new Callable<Object>() {
        public Object call() {
            copy.seek(copy.length() + 1);
            return null;
        }
    }, IllegalArgumentException.class);

    // Any write() call should fail
    expectException(new Callable<Object>() {
        public Object call() throws IOException {
            copy.write(1);
            return null;
        }
    }, UnsupportedOperationException.class);

    expectException(new Callable<Object>() {
        public Object call() throws IOException {
            copy.write(new byte[1]);
            return null;
        }
    }, UnsupportedOperationException.class);

    expectException(new Callable<Object>() {
        public Object call() throws IOException {
            copy.write(new byte[3], 0, 2);
            return null;
        }
    }, UnsupportedOperationException.class);

    copy.seek(0);
    copy.skipBytes(5);

    assertEquals(copy.bytesRemaining(), 15);
    assertEquals(copy.getFilePointer(), 5);
    assertTrue(!copy.isEOF());

    copy.seek(0);
    ByteBuffer contents = copy.readBytes((int) copy.length());

    assertEquals(contents.limit(), copy.length());
    assertTrue(ByteBufferUtil.compare(contents, data) == 0);

    copy.seek(0);

    int count = 0;
    while (!copy.isEOF()) {
        assertEquals((byte) copy.read(), 'c');
        count++;
    }

    assertEquals(count, copy.length());

    copy.seek(0);
    byte[] content = new byte[10];
    copy.read(content);

    assertEquals(new String(content), "cccccccccc");

    file.close();
    copy.close();
}

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