### Question:
FileReadView implements RecordView { @Override public void read(final ByteBuffer bf, final long offset) throws IOException { if (segment.isExpired()) { } int size = 0; while (bf.hasRemaining()) { final int l = this.segment.getFileChannel().read(bf, offset + size); if (l < 0) { break; } size += l; } } FileReadView(Segment segment, final long start,
                        final long offset, final long limit); @Override void read(final ByteBuffer bf, final long offset); @Override void read(final ByteBuffer bf); @Override long getStartOffset(); @Override Segment getSegment(); @Override long getCommitSize();  }### Answer:
@Test public void read() { File file = new File("src/test/resource/testdata"); if (file.exists()) { file.delete(); } try { file.createNewFile(); Segment segment = new FileSegment(0, file, true, SegmentType.DATA); String data = "abcdefghij"; byte[] bytes = data.getBytes(); ByteBuffer buf = ByteBuffer.wrap(bytes); segment.append(buf); segment.flush(true); FileReadView fileReadView = new FileReadView(segment, 0, 10, 10); ByteBuffer bf = ByteBuffer.allocate(10); fileReadView.read(bf, 0); String readData = new String(bf.array()); Assert.isTrue(readData.equals(data)); } catch (IOException e) { e.printStackTrace(); } finally { if (file.exists()) { file.delete(); } } }