interface ExchangeHandler {

    /// @dev Get the available amount left to fill for an order
    /// @param orderAddresses Array of address values needed for this DEX order
    /// @param orderValues Array of uint values needed for this DEX order
    /// @param exchangeFee Value indicating the fee for this DEX order
    /// @param v ECDSA signature parameter v
    /// @param r ECDSA signature parameter r
    /// @param s ECDSA signature parameter s
    /// @return Available amount left to fill for this order
    function getAvailableAmount(
        address[8] orderAddresses,
        uint256[6] orderValues,
        uint256 exchangeFee,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256);

    /// @dev Perform a buy order at the exchange
    /// @param orderAddresses Array of address values needed for each DEX order
    /// @param orderValues Array of uint values needed for each DEX order
    /// @param exchangeFee Value indicating the fee for this DEX order
    /// @param amountToFill Amount to fill in this order
    /// @param v ECDSA signature parameter v
    /// @param r ECDSA signature parameter r
    /// @param s ECDSA signature parameter s
    /// @return Amount filled in this order
    function performBuy(
        address[8] orderAddresses,
        uint256[6] orderValues,
        uint256 exchangeFee,
        uint256 amountToFill,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external payable returns (uint256);

    /// @dev Perform a sell order at the exchange
    /// @param orderAddresses Array of address values needed for each DEX order
    /// @param orderValues Array of uint values needed for each DEX order
    /// @param exchangeFee Value indicating the fee for this DEX order
    /// @param amountToFill Amount to fill in this order
    /// @param v ECDSA signature parameter v
    /// @param r ECDSA signature parameter r
    /// @param s ECDSA signature parameter s
    /// @return Amount filled in this order
    function performSell(
        address[8] orderAddresses,
        uint256[6] orderValues,
        uint256 exchangeFee,
        uint256 amountToFill,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256);
}
/// @title Interface for all exchange handler contracts
function performSell(
    address[8] orderAddresses,
    uint256[6] orderValues,
    uint256 exchangeFee,
    uint256 amountToFill,
    uint8 v,
    bytes32 r,
    bytes32 s
) external returns (uint256);

/// @dev Perform a sell order at the exchange
/// @param orderAddresses Array of address values needed for each DEX order
/// @param orderValues Array of uint values needed for each DEX order
/// @param exchangeFee Value indicating the fee for this DEX order
/// @param amountToFill Amount to fill in this order
/// @param v ECDSA signature parameter v
/// @param r ECDSA signature parameter r
/// @param s ECDSA signature parameter s
/// @return Amount filled in this order