public void gotAck(MemcachedNode node, TapOpcode opcode,
                int opaque) {
              rqueue.add(new TapAck(conn, node, opcode, opaque, this));
            }
Allows the user to specify a custom tap message.

@param id the named tap id that can be used to resume a disconnected tap
         stream
@param message the custom tap message that will be used to initiate the tap
         stream.
@return the operation that controls the tap stream.
@throws ConfigurationException a bad configuration was received from the
          memcached cluster.
@throws IOException if there are errors connecting to the cluster.
src/main/java/net/spy/memcached/TapClient.java