} catch( InterruptedException ie ) {
                throw new TransportException( ie );
            } finally {
                response_map.remove( request );
            }
    }
    private void loop() {
        while( thread == Thread.currentThread() ) {
            try {
                Request key = peekKey();
                if (key == null)
                    throw new IOException( "end of stream" );

        return false;
    }


    /**
     * @param request
     * @return
     */
    protected abstract int getResponseTimeout ( Request request );


    private void loop () {
        while ( this.thread == Thread.currentThread() ) {
            try {
                synchronized ( this.inLock ) {
                    Long key;
                    try {