@Override
public int read(byte[] buffer, int offset, int length) throws IOException {
if (mClosed) {
throw new IOException("Cannot read from a closed stream.");
}
if (mAlluxioFileInputStream != null) {
try {
int ret = mAlluxioFileInputStream.read(buffer, offset, length);
if (mStatistics != null && ret != -1) {
mStatistics.incrementBytesRead(ret);
}
mCurrentPosition += ret;
return ret;
} catch (IOException e) {
LOG.error(e.getMessage(), e);
mAlluxioFileInputStream.close();
mAlluxioFileInputStream = null;
}
}
getHdfsInputStream();
int byteRead = readFromHdfsBuffer();
// byteRead is an unsigned byte, if its -1 then we have hit EOF
if (byteRead == -1) {
return -1;
}
// Convert byteRead back to a signed byte
buffer[offset] = (byte) byteRead;
return 1;
}
@Override
public int read() throws IOException {
if (mClosed) {
throw new IOException("Cannot read from a closed stream.");
}
if (mAlluxioFileInputStream != null) {
try {
int ret = mAlluxioFileInputStream.read();
if (mStatistics != null && ret != -1) {
mStatistics.incrementBytesRead(1);
}
mCurrentPosition++;
return ret;
} catch (IOException e) {
LOG.error(e.getMessage(), e);
mAlluxioFileInputStream.close();
mAlluxioFileInputStream = null;
}
}
getHdfsInputStream();
return readFromHdfsBuffer();
}
@Override
public synchronized int read(long position, byte[] buffer, int offset, int length)
throws IOException {
if (mClosed) {
throw new IOException(ExceptionMessage.READ_CLOSED_STREAM.getMessage());
}
int ret = -1;
long oldPos = getPos();
if ((position < 0) || (position >= mFileInfo.getLength())) {
return ret;
}
if (mAlluxioFileInputStream != null) {
try {
mAlluxioFileInputStream.seek(position);
ret = mAlluxioFileInputStream.read(buffer, offset, length);
if (mStatistics != null && ret != -1) {
mStatistics.incrementBytesRead(ret);
}
return ret;
} finally {
mAlluxioFileInputStream.seek(oldPos);
}
}
try {
getHdfsInputStream(position);
ret = mHdfsInputStream.read(buffer, offset, length);
if (mStatistics != null && ret != -1) {
mStatistics.incrementBytesRead(ret);
}
return ret;
} finally {
if (mHdfsInputStream != null) {
mHdfsInputStream.seek(oldPos);
}
}
}