/**
* Write bytes form the given {@link ByteBuf} to the underlying {@link java.nio.channels.Channel}.
*
* @param buf the {@link ByteBuf} from which the bytes should be written
* @return amount the amount of written bytes
*/
private int doWriteBytes(ByteBuf buf, int readable) throws Exception {
int readerIndex = buf.readerIndex();
int localFlushedAmount;
if (buf.nioBufferCount() == 1) {
if (buf.hasMemoryAddress()) {
localFlushedAmount =
Native.writeAddress(fd, buf.memoryAddress(), readerIndex, buf.writerIndex());
} else {
ByteBuffer nioBuf = buf.internalNioBuffer(readerIndex, readable);
localFlushedAmount = Native.write(fd, nioBuf, nioBuf.position(), nioBuf.limit());
}
} else {
// backed by more then one buffer, do a gathering write...
ByteBuffer[] nioBufs = buf.nioBuffers();
localFlushedAmount = (int) Native.writev(fd, nioBufs, 0, nioBufs.length);
}
if (localFlushedAmount > 0) {
buf.readerIndex(readerIndex + localFlushedAmount);
}
return localFlushedAmount;
}
private void writeBytesMultiple(
NioSocketChannelOutboundBuffer in, int msgCount, ByteBuffer[] nioBuffers) throws IOException {
int nioBufferCnt = in.nioBufferCount();
long expectedWrittenBytes = in.nioBufferSize();
long localWrittenBytes = Native.writev(fd, nioBuffers, 0, nioBufferCnt);
if (localWrittenBytes < expectedWrittenBytes) {
setEpollOut();
// Did not write all buffers completely.
// Release the fully written buffers and update the indexes of the partially written buffer.
for (int i = msgCount; i > 0; i--) {
final ByteBuf buf = (ByteBuf) in.current();
final int readerIndex = buf.readerIndex();
final int readableBytes = buf.writerIndex() - readerIndex;
if (readableBytes < localWrittenBytes) {
in.remove();
localWrittenBytes -= readableBytes;
} else if (readableBytes > localWrittenBytes) {
buf.readerIndex(readerIndex + (int) localWrittenBytes);
in.progress(localWrittenBytes);
break;
} else { // readable == writtenBytes
in.remove();
break;
}
}
} else {
// Release all buffers
for (int i = msgCount; i > 0; i--) {
in.remove();
}
}
}