private void write(SelectionKey key) {
SocketChannel socketChannel = (SocketChannel) key.channel();
DataServerMessage sendMessage = mSendingData.get(socketChannel);
boolean closeChannel = false;
try {
sendMessage.send(socketChannel);
} catch (IOException e) {
closeChannel = true;
LOG.error(e.getMessage());
}
if (sendMessage.finishSending() || closeChannel) {
try {
key.channel().close();
} catch (IOException e) {
LOG.error(e.getMessage());
}
key.cancel();
mReceivingData.remove(socketChannel);
mSendingData.remove(socketChannel);
sendMessage.close();
mBlocksLocker.unlock(Math.abs(sendMessage.getBlockId()), sendMessage.getLockId());
}
}
/**
* Create a new socket to the data port and send a block request. The returned value is the
* response from the server.
*/
private DataServerMessage request(final BlockInfo block, final long offset, final long length)
throws IOException, TException {
DataServerMessage sendMsg =
DataServerMessage.createBlockRequestMessage(block.blockId, offset, length);
SocketChannel socketChannel =
SocketChannel.open(
new InetSocketAddress(
block.getLocations().get(0).getWorkerAddress().getHost(),
block.getLocations().get(0).getWorkerAddress().getDataPort()));
try {
while (!sendMsg.finishSending()) {
sendMsg.send(socketChannel);
}
DataServerMessage recvMsg =
DataServerMessage.createBlockResponseMessage(false, block.blockId, offset, length, null);
while (!recvMsg.isMessageReady()) {
int numRead = recvMsg.recv(socketChannel);
if (numRead == -1) {
break;
}
}
return recvMsg;
} finally {
socketChannel.close();
}
}
