SyncPortHelper.hpp

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#ifndef DW_FRAMEWORK_SYNCPORTHELPER_HPP_
#define DW_FRAMEWORK_SYNCPORTHELPER_HPP_
 
#include <dw/core/container/HashContainer.hpp>
#include <dwcgf/channel/Channel.hpp>
 
namespace dw
{
namespace framework
{
 
using CycleCountFetcher = dw::core::Function<uint32_t(void)>;
 
// These classes are used to parse and handle indexed packets.
// TODO (ajayawardane) Move this logic into a separate port and change
// the port type for each pipelined node.
struct SyncPortHelper
{
public:
    SyncPortHelper()
        : m_dataSynced(false)
        , m_syncCount(0U)
        , m_dataOffset(0U)
        , m_syncCountRetriever(nullptr)
    {
    }
    void setSyncCount(uint32_t index);
    virtual void parseDataSynced(const ChannelParams& params);
    bool isDataSynced();
    dwStatus setSyncRetriever(const CycleCountFetcher& func);
 
protected:
    ChannelPacketTypeID getNewPacketID(ChannelPacketTypeID packetTypeID);
    void stampSyncCount(uint32_t& syncCountOut) const;
 
    bool m_dataSynced;
    uint32_t m_syncCount;
    uint32_t m_dataOffset;
    CycleCountFetcher m_syncCountRetriever;
};
 
template <typename T>
class SyncPortHelperOutput : public SyncPortHelper
{
public:
    SyncPortHelperOutput()
        : SyncPortHelper()
    {
    }
 
protected:
    T* extractInternalPacket(GenericData genericData)
    {
        auto syncPacket = genericData.template getData<SyncedPacketPayload>();
 
        if (!syncPacket)
        {
            throw Exception(DW_INTERNAL_ERROR, "SyncPortHelperOutput extractInternalPacket: packet type mismatch");
        }
 
        auto packet = syncPacket->data.template getData<T>();
        if (!packet)
        {
            throw Exception(DW_INTERNAL_ERROR, "SyncPortHelperOutput extractInternalPacket: failed to extract underlying data");
        }
 
        m_syncPacketBuf[packet] = syncPacket;
        return packet;
    }
 
    SyncedPacketPayload* getSyncPacket(T* frame)
    {
        SyncedPacketPayload* syncPacket = m_syncPacketBuf[frame];
        if (!syncPacket)
        {
            throw Exception(DW_INTERNAL_ERROR, "SyncPortHelperOutput getSyncPacket: sync packet not found in packet buffer");
        }
 
        stampSyncCount(syncPacket->syncCount);
 
        return syncPacket;
    }
 
    void parseDataSynced(const ChannelParams& params) override
    {
        SyncPortHelper::parseDataSynced(params);
        if (isDataSynced())
        {
            m_syncPacketBuf = HeapHashMap<T*, SyncedPacketPayload*>(params.getPoolCapacity());
        }
    }
 
private:
    HeapHashMap<T*, SyncedPacketPayload*> m_syncPacketBuf;
};
 
template <typename T>
class SyncPortHelperInput : public SyncPortHelper
{
public:
    SyncPortHelperInput()
        : SyncPortHelper()
        , m_bufferedPacket()
        , m_dataBuffered(false)
    {
    }
 
protected:
    bool isPacketBuffered()
    {
        if (m_dataBuffered)
        {
            return true;
        }
        return false;
    }
 
    bool isValidPacketBuffered()
    {
        if (!isPacketBuffered())
        {
            return false;
        }
 
        auto packet = m_bufferedPacket.template getData<SyncedPacketPayload>();
 
        if (!packet)
        {
            throw Exception(DW_INTERNAL_ERROR, "SyncPortHelperInput isValidPacketBuffered: packet type mistmatch");
        }
        return validatePacket(*packet);
    }
 
    GenericData getBufferedPacket()
    {
        m_dataBuffered = false;
        return m_bufferedPacket;
    }
 
    T* extractInternalPacket(GenericData genericData)
    {
        auto syncPacket = genericData.template getData<SyncedPacketPayload>();
 
        if (!syncPacket)
        {
            throw Exception(DW_INTERNAL_ERROR, "SyncPortHelperInput extractInternalPacket: packet type mistmatch");
        }
 
        if (validatePacket(*syncPacket))
        {
            return syncPacket->data.template getData<T>();
        }
        else
        {
            m_bufferedPacket = genericData;
            m_dataBuffered   = true;
            return nullptr;
        }
    }
 
private:
    bool validatePacket(SyncedPacketPayload& pkt)
    {
        // If a producer - consumer pair are across pipeline boundaries, they will
        // have non-zero data offsets; however, connections from that producer to
        // consumers not across the pipeline boundary must also have sync ports
        // (since if a producer is sync, all consumers must be sync). This check
        // is in place for cases where producer -> consumer pairs are in the same
        // pipeline boundary, and is basically a no-op for synchronization.
        if (m_dataOffset == 0)
        {
            return true;
        }
 
        uint32_t syncCount = (m_syncCountRetriever) ? m_syncCountRetriever() : m_syncCount;
 
        // Check if the packet is valid for consumption. The packet sync count represents
        // when the packet was produced and the m_syncCount is the current sync count.
        // The data offset is the offset between when it was produced and when it is
        // available for consumption.
        int validOffset = static_cast<int>(syncCount - pkt.syncCount - m_dataOffset);
 
        if (validOffset >= 0)
        {
            return true;
        }
 
        return false;
    }
 
    GenericData m_bufferedPacket;
    bool m_dataBuffered;
};
 
} // namespace framework
} // namespace dw
 
#endif // DW_FRAMEWORK_SYNCPORTHELPER_HPP_