/// <summary>
/// Removes the current operation Id from the stack and returns it.
/// </summary>
/// <returns>The Operation id that was removed.</returns>
public long RemoveOperation()
{
long removedOperation;
// we just decrement the position, max speed.
this.currentOperationPosition--;
fixed(long *localStack = this.operationStack)
{
removedOperation = localStack[this.currentOperationPosition.Position];
// copy
CircularArrayPosition cap = this.currentOperationPosition;
// we already ahve a handle to -1, we need to get to -2
cap--;
this.currentId = localStack[cap.Position];
cap--;
this.parentId = localStack[cap.Position];
}
Diag($"{nameof(CorrelationContext)}.{nameof(this.RemoveOperation)} ID = {removedOperation} POS = {this.currentOperationPosition.Position} Npm2AJtM20M");
return(removedOperation);
}
/// <summary>
/// Initializes a new instance of the <see cref="CorrelationContext"/> struct.
/// </summary>
/// <param name="rootSessionId">Creates a new Context with a seeded random first Id.</param>
public CorrelationContext(long rootSessionId)
{
long sid;
unchecked
{
sid = rootSessionId + rng.NextInt64();
}
this.currentOperationPosition = new CircularArrayPosition(OPERATIONSTACKSIZE);
fixed(long *localStack = this.operationStack)
{
localStack[0] = sid;
}
this.currentOperationPosition++;
this.currentId = rootSessionId;
this.parentId = default(long);
this.rootId = sid;
}
/// <summary>
/// Initializes a new instance of the <see cref="CorrelationContext"/> struct from the captured correlation context. This context may be from another thread, application domain, process, machine or even application.
/// </summary>
/// <param name="capturedContext">The captured context to recreate the operation tree.</param>
public CorrelationContext(byte[] capturedContext)
{
if (capturedContext == null)
{
throw new ArgumentNullException(nameof(capturedContext));
}
if (capturedContext.Length % OPERATIONIDBYTELENGTH != 0)
{
throw new ArgumentException("The captured context is corrupt, it must be a multiple of 8 to resolve operation Ids");
}
if (capturedContext.Length > OPERATIONSTACKSIZE * OPERATIONIDBYTELENGTH)
{
throw new ArgumentException("The context captured i corrupt and unusable, it is from a different runtime (Too big)");
}
this.currentOperationPosition = new CircularArrayPosition(OPERATIONSTACKSIZE);
this.currentId = default(long);
this.parentId = default(long);
long operationId;
long rid = BitConverter.ToInt64(capturedContext, 0);
this.rootId = rid;
fixed(long *localStack = this.operationStack)
{
for (int i = 0; i < capturedContext.Length; i += OPERATIONIDBYTELENGTH)
{
operationId = BitConverter.ToInt64(capturedContext, i);
localStack[this.currentOperationPosition.Position] = operationId;
this.currentOperationPosition++;
// copy
CircularArrayPosition parentFinder = this.currentOperationPosition;
// if rolled over, we will have a parent.
if (parentFinder.TotalTraversal == 1)
{
this.parentId = -1;
this.currentId = localStack[0];
}
else if (parentFinder.TotalTraversal == 2)
{
this.currentId = localStack[1];
this.parentId = localStack[0];
}
else
{
// might have traversal and be at [0].
// need to use circular array counter;
parentFinder--;
this.currentId = localStack[parentFinder.Position];
parentFinder--;
this.parentId = localStack[parentFinder.Position];
}
}
}
}
/// <summary>
/// Captures the current correlation context and returns it.
/// </summary>
/// <returns>The captured context.</returns>
public byte[] Capture()
{
byte[] result;
long operationId;
byte[] buffer;
// compute operationIdString
if (this.currentOperationPosition.HasRolledOver)
{
// the circular array has rolled over, we must assume overwrite, we must also rollover to compute the Id.
// 0123456789 123456789 123456789
// ^ current position (14)
// we should index as 15, 16, 17 ... 11, 12 ,13 ,
// use current position in case is at the very end.
CircularArrayPosition roller = new CircularArrayPosition(OPERATIONSTACKSIZE, this.currentOperationPosition.Position);
roller++;
int traversal = this.currentOperationPosition.TotalTraversal > OPERATIONSTACKSIZE
? OPERATIONSTACKSIZE
: this.currentOperationPosition.TotalTraversal;
// allocate result
result = new byte[traversal * OPERATIONIDBYTELENGTH];
fixed(long *localStack = this.operationStack)
{
for (int i = 0; i < traversal; i++)
{
operationId = localStack[roller.Position];
buffer = BitConverter.GetBytes(operationId);
int destinationIndex = i * OPERATIONIDBYTELENGTH;
Array.Copy(buffer, 0, result, destinationIndex, OPERATIONIDBYTELENGTH);
// roll to next operation id;
roller++;
}
}
}
else
{
int position = this.currentOperationPosition.Position;
result = new byte[position * OPERATIONIDBYTELENGTH];
fixed(long *localStack = this.operationStack)
{
for (int i = 0; i < position; i++)
{
operationId = localStack[i];
buffer = BitConverter.GetBytes(operationId);
int destinationIndex = i * OPERATIONIDBYTELENGTH;
Array.Copy(buffer, 0, result, destinationIndex, OPERATIONIDBYTELENGTH);
}
}
}
return(result);
}
