How to use

getBufferAllocator

method

in

org.kaazing.gateway.transport.wsn.WsnSession

if (WebSocketWireProtocol.HYBI_13.equals(wsVersion) || WebSocketWireProtocol.HYBI_8.equals(wsVersion)) {
  final IoBufferAllocatorEx<? extends WsBuffer> allocator = wsnSession.getBufferAllocator();
  ByteBuffer messageNioBuf = allocator.allocate(response.getBytes().length + 4);
  IoBufferEx messageBuf = allocator.wrap(messageNioBuf).setAutoExpander(allocator);

WsBuffer wsBuffer = (ioBufferEx instanceof WsBuffer)
    ? (WsBuffer) ioBufferEx
    : session.getBufferAllocator().wrap(ioBufferEx.buf());
switch (wsMessage.getKind()) {
  case BINARY:

@Override
protected void doFilterWrite(final NextFilter nextFilter,
               final WsnSession wsnSession,
               WriteRequest writeRequest) throws Exception {
  IoSession parent = wsnSession.getParent();
  Encoding encoding = (Encoding) parent.getAttribute("encoding");
  final WsMessage emptyWsMessage;
  final IoBufferAllocatorEx<?> allocator = wsnSession.getBufferAllocator();
  switch(encoding) {
    case TEXT:
      emptyWsMessage = new WsTextMessage(allocator.wrap(allocator.allocate(0)));
      break;
    default:
      emptyWsMessage = new WsBinaryMessage(allocator.wrap(allocator.allocate(0)));
  }
  writeRequest.getFuture().addListener(new IoFutureListener<WriteFuture>() {
    @Override
    public void operationComplete(WriteFuture future) {
      if (logger.isDebugEnabled()) {
        logger.debug("HttpEmptyPacketWriterFilter writing empty packet.");
      }
      wsnSession.getParent().write(emptyWsMessage);
    }
  });
  HttpResponseMessage message = (HttpResponseMessage) writeRequest.getMessage();
  if ( message.getStatus() != HttpStatus.CLIENT_UNAUTHORIZED) {
    wsnSession.getFilterChain().remove(HttpEmptyPacketWriterFilter.this);
  }
  nextFilter.filterWrite(wsnSession, writeRequest);
}

IoBufferAllocatorEx<? extends WsBuffer> allocator = wsnSession.getBufferAllocator();