Delegate work to the DSP class http://www.eventhelix.com/realtimemantra/object_oriented/object_design_tips_2.htm

delegate-work-to-dsp.cpp

class DSP
{
public:
    void WriteBuffer(Buffer *pBuf);
    Buffer *ReadBuffer();   
};   

Status MessageHandler::SendMessage(Buffer *)
{
    int dspId = pBuffer->GetDSP();
    
    pDSP = m_dsp[dspId];
    
    int status = pDSP->WriteBuffer();
    
    return status;
}

Status DSP::WriteBuffer(Buffer *)
{    
    int status = m_pQueue->Add(pBuffer);    
    
    IOWrite(WRITTEN_MESSAGE);
    
    if (m_pQueue->GetLength() > CONGESTION_THRESHOLD)
    {
       m_bCongestionFlag = true;
    }
    
    return status;
}