/* Initiates a call by sending the parameter to the remote server.
* Note: this is not called from the Connection thread, but by other
* threads.
*/
protected void sendParam(Call call) {
if (shouldCloseConnection.get()) {
return;
}
// For serializing the data to be written.
final DataOutputBuffer d = new DataOutputBuffer();
try {
if (LOG.isDebugEnabled()) LOG.debug(getName() + " sending #" + call.id);
d.writeInt(0xdeadbeef); // placeholder for data length
d.writeInt(call.id);
call.param.write(d);
byte[] data = d.getData();
int dataLength = d.getLength();
// fill in the placeholder
Bytes.putInt(data, 0, dataLength - 4);
//noinspection SynchronizeOnNonFinalField
synchronized (this.out) { // FindBugs IS2_INCONSISTENT_SYNC
out.write(data, 0, dataLength);
out.flush();
}
} catch (IOException e) {
markClosed(e);
} finally {
// the buffer is just an in-memory buffer, but it is still polite to
// close early
IOUtils.closeStream(d);
}
}
/**
* Serialize the shuffle port into a ByteBuffer for use later on.
*
* @param port the port to be sent to the ApplciationMaster
* @return the serialized form of the port.
*/
public static ByteBuffer serializeMetaData(int port) throws IOException {
// TODO these bytes should be versioned
DataOutputBuffer port_dob = new DataOutputBuffer();
port_dob.writeInt(port);
return ByteBuffer.wrap(port_dob.getData(), 0, port_dob.getLength());
}