/// <summary>
/// Construct from marshaled data
/// </summary>
/// <param name="byteArray">The marshaled data.</param>
/// <param name="offset">The starting offset.</param>
public TokenPairRecord(byte[] byteArray, int offset)
{
if (byteArray.Length - offset < TokenPairRecSize)
{
throw new ArgumentException(string.Format("Array length must be >= {0}", TokenPairRecSize));
}
T1 = new Token(byteArray, offset);
T2 = new Token(byteArray, Token.TokenSize + offset);
offset += (2 * Token.TokenSize);
Ts = 0;
// little Endian
for (int index = 0; index < sizeof(long); ++index)
{
Ts |= ((long)byteArray[offset + index] << (index * 8));
}
}
/// <summary>
/// Convenience Constructor
/// </summary>
public TokenPairRecord(Token t1, Token t2, long timestamp)
{
T1 = t1;
T2 = t2;
Ts = timestamp;
}
/// <summary>
/// Changes the event state of the token.
/// </summary>
/// <param name="eventId">The new event id.</param>
/// <param name="currentRecord">The original token value.</param>
/// <param name="factory">An ITokenPairRecord factory(T1, T2, Ts).</param>
/// <returns>A new ITokenPairRecord.</returns>
public ITokenPairRecord AddEvent(byte eventId, ulong currentRecord,
Func<Token, Token, long, ITokenPairRecord> factory = null)
{
if (!_isEnabled || (currentRecord == SkippedTokenValue))
return SkippedTokenReference;
long timestamp = Stopwatch.GetTimestamp();
var currentToken = new Token(currentRecord);
var nextToken = new Token(currentToken.Value) { EventId = eventId };
var nextRecord = (factory ?? _defaultFactory)(currentToken, nextToken, timestamp);
_processingQueue.Enqueue(nextRecord);
return nextRecord;
}
/// <summary>
/// Constructs and queues a new token with the original token as a token pair rec.
/// This represents a 'split' in the event chain.
/// This signature is for the C++ wrapper types.
/// </summary>
/// <param name="eventId">The event id porition of the new token.</param>
/// <param name="currentRecord">The original token value.</param>
/// <param name="factory">An ITokenPairRecord factory(T1, T2, Ts).</param>
/// <returns>A new ITokenPairRecord.</returns>
public ITokenPairRecord SplitToken(byte eventId, ulong currentRecord,
Func<Token, Token, long, ITokenPairRecord> factory = null)
{
if (!_isEnabled
|| (currentRecord == SkippedTokenValue)
|| ShouldNotSample())
return SkippedTokenReference;
var currentToken = new Token(currentRecord);
long timestamp = Stopwatch.GetTimestamp();
long id = Interlocked.Increment(ref _previousId);
var nextToken = new Token(_applicationId, eventId, (ulong)id);
var nextRecord = (factory ?? _defaultFactory)(currentToken, nextToken, timestamp);
_processingQueue.Enqueue(nextRecord);
return nextRecord;
}
static void OutputToken( Token token )
{
var ae = new ASCIIEncoding();
byte[] outBytes = ae.GetBytes(token.AppId.ToString());
_outStream.Write(outBytes, 0, outBytes.Length);
_outStream.WriteByte((byte)',');
outBytes = ae.GetBytes(token.EventId.ToString("g"));
_outStream.Write(outBytes, 0, outBytes.Length);
_outStream.WriteByte((byte)',');
outBytes = ae.GetBytes(token.Id.ToString());
_outStream.Write(outBytes, 0, outBytes.Length);
}
