public Engine(DataRequestHandler db, IVisualisationHandler screen)
{
Database = db;
Screen = screen;
//Make sure that the resources directory exists
if (!Directory.Exists(ResourcePath))
{
Directory.CreateDirectory(ResourcePath);
}
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="maxRequestNumberPerDestination">max incoming requests buffered per destination</param>
/// <param name="lowerLayerDataRequestHandler">lower layer handler for sending PDU</param>
/// <param name="tail">maximum transmission unit in bytes for the lower layer</param>
/// <param name="head">required space for header for the lower layer</param>
/// <param name="tail">required space for tail for the lower layer</param>
public Fragmentation(int maxRequestNumberPerDestination,
DataRequestHandler lowerLayerDataRequestHandler, int mtu, int head, int tail)
{
_maxRequestNumberPerDestination = maxRequestNumberPerDestination;
_started = false;
_lowerLayerDataRequest = lowerLayerDataRequestHandler;
_lock = new Object();
_lowerHead = head;
_lowerTail = tail;
_lowerMtu = mtu;
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="maxRequestNumberPerDestination">max incoming requests buffered per destination</param>
/// <param name="lowerLayerDataRequestHandler">lower layer handler for sending PDU</param>
/// <param name="tail">maximum transmission unit in bytes for the lower layer</param>
/// <param name="head">required space for header for the lower layer</param>
/// <param name="tail">required space for tail for the lower layer</param>
public Fragmentation(int maxRequestNumberPerDestination,
DataRequestHandler lowerLayerDataRequestHandler, int mtu, int head, int tail)
{
_maxRequestNumberPerDestination = maxRequestNumberPerDestination;
_started = false;
_lowerLayerDataRequest = lowerLayerDataRequestHandler;
_lock = new Object();
_lowerHead = head;
_lowerTail = tail;
_lowerMtu = mtu;
}
internal InboundFragmentationMessage(
UInt16 source,
UInt16 destination,
byte sequenceNumber,
DataRequestHandler lowerLayerRequestHandler,
int maxPduSize,
int reservedHeaderSize,
int reservedTailSize,
FragmentationMessageTimer timer)
: base(source, destination, sequenceNumber, lowerLayerRequestHandler, maxPduSize, reservedHeaderSize, reservedTailSize, timer)
{
}
internal FragmentationMessage(
UInt16 source,
UInt16 destination,
byte messageSeqNumber,
DataRequestHandler lowerLayerRequestHandler,
int maxPduSize,
int reservedHeaderSize,
int reservedTailSize,
FragmentationMessageTimer timer)
{
_timer = timer;
_lowerLayerRequestHandler = lowerLayerRequestHandler;
_currentState = FragmentationMessageState.Initial;
_source = source;
_destination = destination;
_messageSeqNumber = messageSeqNumber;
_lock = new object();
_timeoutTicks = long.MaxValue;
_maxPduSize = maxPduSize;
_reservedHeaderSize = reservedHeaderSize;
_reservedTailSize = reservedTailSize;
_lastFragmentSeqNumberReceived = 0xFF;
_lastFragmentSeqNumberSent = 0xFF;
}
protected IAsyncResult HandleRequestItem(RequestItem requestItem)
{
DataRequestHandler handler = dispatcher.getHandler(requestItem.getService());
return(handler == null ? null : handler.handleItem(requestItem));
}
internal OutboundFragmentationMessage(
UInt16 source,
UInt16 destination,
byte messageSeqNumber,
DataRequestHandler lowerLayerRequestHandler,
ref Frame sdu,
Byte sduHandle,
DataConfirmHandler handler,
int maxPduSize,
int reservedHeaderSize,
int reservedTailSize,
FragmentationMessageTimer timer
)
: base(source, destination, messageSeqNumber, lowerLayerRequestHandler, maxPduSize, reservedHeaderSize, reservedTailSize, timer)
{
if (sdu.LengthDataUsed == 0)
{
Frame.Release(ref sdu);
throw new ArgumentException("sdu is empty", "sdu");
}
int payloadSize = maxPduSize - 2 - 2; // 2 for our own header, 1 for nb fragment, 1 for fragment id
if (payloadSize == 0)
{
Frame.Release(ref sdu);
throw new ArgumentException("PDU is too small", "maxPduSize");
}
ushort flag = (ushort)(1 << 15);
_isBroadcast = (destination & flag) > 0 ? true : false;
_sdu = sdu;
sdu = null;
_sduHandle = sduHandle;
_dataConfirmHandler = handler;
_messageSeqNumber = messageSeqNumber;
_timeoutForResending = c_defaultTimeoutForResending;
_maxFragmentsBeforeAck = c_defaultMaxFragmentsBeforeAck;
// compute required nb fragments and respective indices.
int nbFragments = ((_sdu.LengthDataUsed % payloadSize) == 0) ? _sdu.LengthDataUsed / payloadSize : 1 + _sdu.LengthDataUsed / payloadSize;
if (nbFragments > byte.MaxValue)
{
throw new ArgumentException("sdu is too large.");
}
_nbFragments = (byte)nbFragments;
_endingIndices = new int[_nbFragments];
int lastIndex = -1;
for (int i = 0; i + 1 < _nbFragments; i++)
{
lastIndex += payloadSize;
_endingIndices[i] = lastIndex;
}
lastIndex += ((_sdu.LengthDataUsed % payloadSize) == 0) ? payloadSize : _sdu.LengthDataUsed % payloadSize;
_endingIndices[_nbFragments - 1] = lastIndex;
_successfullyTransmittedFragments = new BitArray(_nbFragments, false);
_lastFragmentSent = new BitArray(_nbFragments, false);
}
internal InboundFragmentationMessage(
UInt16 source,
UInt16 destination,
byte sequenceNumber,
DataRequestHandler lowerLayerRequestHandler,
int maxPduSize,
int reservedHeaderSize,
int reservedTailSize,
FragmentationMessageTimer timer)
: base(source, destination, sequenceNumber, lowerLayerRequestHandler, maxPduSize, reservedHeaderSize, reservedTailSize, timer)
{
}
internal OutboundFragmentationMessage(
UInt16 source,
UInt16 destination,
byte messageSeqNumber,
DataRequestHandler lowerLayerRequestHandler,
ref Frame sdu,
Byte sduHandle,
DataConfirmHandler handler,
int maxPduSize,
int reservedHeaderSize,
int reservedTailSize,
FragmentationMessageTimer timer
)
: base(source, destination, messageSeqNumber, lowerLayerRequestHandler, maxPduSize, reservedHeaderSize, reservedTailSize, timer)
{
if (sdu.LengthDataUsed == 0)
{
Frame.Release(ref sdu);
throw new ArgumentException("sdu is empty", "sdu");
}
int payloadSize = maxPduSize - 2 - 2; // 2 for our own header, 1 for nb fragment, 1 for fragment id
if (payloadSize == 0)
{
Frame.Release(ref sdu);
throw new ArgumentException("PDU is too small", "maxPduSize");
}
ushort flag = (ushort)(1 << 15);
_isBroadcast = (destination & flag) > 0 ? true : false;
_sdu = sdu;
sdu = null;
_sduHandle = sduHandle;
_dataConfirmHandler = handler;
_messageSeqNumber = messageSeqNumber;
_timeoutForResending = c_defaultTimeoutForResending;
_maxFragmentsBeforeAck = c_defaultMaxFragmentsBeforeAck;
// compute required nb fragments and respective indices.
int nbFragments = ((_sdu.LengthDataUsed % payloadSize) == 0) ? _sdu.LengthDataUsed / payloadSize : 1 + _sdu.LengthDataUsed / payloadSize;
if (nbFragments > byte.MaxValue)
throw new ArgumentException("sdu is too large.");
_nbFragments = (byte)nbFragments;
_endingIndices = new int[_nbFragments];
int lastIndex = -1;
for (int i = 0; i + 1 < _nbFragments; i++)
{
lastIndex += payloadSize;
_endingIndices[i] = lastIndex;
}
lastIndex += ((_sdu.LengthDataUsed % payloadSize) == 0) ? payloadSize : _sdu.LengthDataUsed % payloadSize;
_endingIndices[_nbFragments - 1] = lastIndex;
_successfullyTransmittedFragments = new BitArray(_nbFragments, false);
_lastFragmentSent = new BitArray(_nbFragments, false);
}
internal FragmentationMessage(
UInt16 source,
UInt16 destination,
byte messageSeqNumber,
DataRequestHandler lowerLayerRequestHandler,
int maxPduSize,
int reservedHeaderSize,
int reservedTailSize,
FragmentationMessageTimer timer)
{
_timer = timer;
_lowerLayerRequestHandler = lowerLayerRequestHandler;
_currentState = FragmentationMessageState.Initial;
_source = source;
_destination = destination;
_messageSeqNumber = messageSeqNumber;
_lock = new object();
_timeoutTicks = long.MaxValue;
_maxPduSize = maxPduSize;
_reservedHeaderSize = reservedHeaderSize;
_reservedTailSize = reservedTailSize;
_lastFragmentSeqNumberReceived = 0xFF;
_lastFragmentSeqNumberSent = 0xFF;
}
/**
* Adds a custom handler.
*/
public void addHandler(String service, DataRequestHandler handler)
{
handlers.Add(service, handler);
}
