@Override
public void write(byte[] b, int off, int len) throws IOException {
if (b == null) {
throw new NullPointerException();
} else if ((off < 0)
|| (off > b.length)
|| (len < 0)
|| ((off + len) > b.length)
|| ((off + len) < 0)) {
throw new IndexOutOfBoundsException(
String.format("Buffer length (%d), offset(%d), len(%d)", b.length, off, len));
}
if (!mCanWrite) {
throw new IOException("Can not write cache.");
}
if (mWrittenBytes + len > BLOCK_CAPACITY_BYTE) {
throw new IOException("Out of capacity.");
}
if (mBuffer.position() + len >= USER_CONF.FILE_BUFFER_BYTES) {
if (mBuffer.position() > 0) {
appendCurrentBuffer(mBuffer.array(), 0, mBuffer.position());
mBuffer.clear();
}
if (len > 0) {
appendCurrentBuffer(b, off, len);
}
} else {
mBuffer.put(b, off, len);
}
mWrittenBytes += len;
}
@Override
public void write(int b) throws IOException {
if (!mCanWrite) {
throw new IOException("Can not write cache.");
}
if (mWrittenBytes + 1 > BLOCK_CAPACITY_BYTE) {
throw new IOException("Out of capacity.");
}
if (mBuffer.position() >= USER_CONF.FILE_BUFFER_BYTES) {
appendCurrentBuffer(mBuffer.array(), 0, mBuffer.position());
mBuffer.clear();
}
mBuffer.put((byte) (b & 0xFF));
mWrittenBytes++;
}
@Override
public void close() throws IOException {
if (!mClosed) {
if (!mCancel && mBuffer.position() > 0) {
appendCurrentBuffer(mBuffer.array(), 0, mBuffer.position());
}
if (mLocalFileChannel != null) {
mLocalFileChannel.close();
mLocalFile.close();
}
if (mCancel) {
TFS.releaseSpace(mWrittenBytes - mBuffer.position());
new File(mLocalFilePath).delete();
LOG.info("Canceled output of block " + BLOCK_ID + ", deleted local file " + mLocalFilePath);
} else {
TFS.cacheBlock(BLOCK_ID);
}
}
mClosed = true;
}