/// <summary>
/// Processes a received IAm request
/// </summary>
/// <param name="appgram">The appgram that contained the request</param>
/// <param name="request">The IAm request</param>
/// <returns>The created device table entry</returns>
private DeviceTableEntry _processIAmRequest(InboundAppgram appgram, IAmRequest request)
{
DeviceTableEntry entry = new DeviceTableEntry(
request.IAmDeviceIdentifier.Instance,
appgram.Source,
request.MaxAPDULengthAccepted,
request.SegmentationSupported,
(ushort)request.VendorID);
lock (_lock)
{
_devices.Upsert(entry);
for (var node = _deviceSearches.First; node != null; node = node.Next)
{
if (node.Value.Feed(entry))
{
node.Value.Dispose();
_deviceSearches.Remove(node);
}
}
}
return(entry);
}
/// <summary>
/// Upserts a new entry into the device table
/// </summary>
/// <param name="entry">The entry to upsert</param>
public void Upsert(DeviceTableEntry entry)
{
for (int i = 0; i < _count; i++)
{
int index = (_start + i) % _entries.Length;
var oldEntry = _entries[index];
if (oldEntry != null && oldEntry.Instance == entry.Instance)
{
_entries[index] = entry;
return;
}
}
if (_count < _entries.Length)
{
int insertIndex = (_start + _count) % _entries.Length;
_entries[insertIndex] = entry;
_count++;
}
else
{
_entries[_start] = entry;
_start = (_start + 1) % _entries.Length;
}
}
/// <summary>
/// Processes a received unconfirmed request
/// </summary>
/// <param name="appgram">The inbound appgram</param>
/// <param name="message">The unconfirmed request message</param>
/// <param name="buffer">The buffer containing the request content</param>
/// <param name="offset">The offset of the request content in the buffer</param>
/// <param name="end">The end of the request content</param>
private InboundUnconfirmedRequest _processUnconfirmedRequest(InboundAppgram appgram, UnconfirmedRequestMessage message, byte[] buffer, int offset, int end)
{
UnconfirmedServiceChoice choice = (UnconfirmedServiceChoice)message.ServiceChoice;
IUnconfirmedRequest request = _loadUnconfirmedRequest(choice, buffer, offset, end);
DeviceTableEntry source = null;
if (request.ServiceChoice == UnconfirmedServiceChoice.IAm)
{
// the only request that we handle at the host level is an IAm request,
// which is necessary for TSM operations, since information about the remote
// host is needed
source = _processIAmRequest(appgram, (IAmRequest)request);
}
else
{
source = _devices.GetByAddress(appgram.Source);
}
InboundUnconfirmedRequest inbound = new InboundUnconfirmedRequest(
appgram.Source,
source,
request);
return(inbound);
}
/// <summary>
/// Feeds a new device table entry into the
/// search
/// </summary>
/// <param name="entry">The to feed</param>
/// <returns>True if the search is now satisfied, false otherwise</returns>
public bool Feed(DeviceTableEntry entry)
{
bool satisfies = false;
if (IsInstanceSearch && entry.Instance == Instance)
{
satisfies = true;
}
else if (!IsInstanceSearch && entry.Instance != Instance)
{
satisfies = true;
}
if (satisfies)
{
this.Callback.DeviceFound(entry);
}
return(satisfies);
}
/// <summary>
/// Upserts a new entry into the device table
/// </summary>
/// <param name="entry">The entry to upsert</param>
public void Upsert(DeviceTableEntry entry)
{
for(int i = 0; i < _count; i++)
{
int index = (_start + i) % _entries.Length;
var oldEntry = _entries[index];
if (oldEntry != null && oldEntry.Instance == entry.Instance)
{
_entries[index] = entry;
return;
}
}
if(_count < _entries.Length)
{
int insertIndex = (_start + _count) % _entries.Length;
_entries[insertIndex] = entry;
_count++;
}
else
{
_entries[_start] = entry;
_start = (_start + 1) % _entries.Length;
}
}
/// <summary>
/// Constructs a new inbound unconfirmed request
/// </summary>
/// <param name="sourceAddress">The device that sent the request</param>
/// <param name="source">The device table entry of the device that sent the request</param>
/// <param name="request">The request instance</param>
public InboundUnconfirmedRequest(Address sourceAddress, DeviceTableEntry source, IUnconfirmedRequest request)
{
this.SourceAddress = sourceAddress;
this.Source = source;
this.Request = request;
}
/// <summary>
/// Constructs a new inbound unconfirmed request
/// </summary>
/// <param name="sourceAddress">The device that sent the request</param>
/// <param name="source">The device table entry of the device that sent the request</param>
/// <param name="request">The request instance</param>
public InboundUnconfirmedRequest(Address sourceAddress, DeviceTableEntry source, IUnconfirmedRequest request)
{
this.SourceAddress = sourceAddress;
this.Source = source;
this.Request = request;
}
