public void send( String topic, String message ) throws IOException
    {
        send( topic, message, null );
    }
public void send( String topic, String message ) throws IOException
    {
        send( topic, message, null );
    }
public void send ( String topic , String message ) throws IOException { send ( topic , message , null ) ; }
Non-blocking send. The message will not be really available to consumers until flush()
or close() is called, or until another blocking send is called.
Non - blocking send . The message will not be really available to consumers until flush () or close () is called or until another blocking send is called .