/// <summary>
/// Adds assigned download to <see cref="assignedDownloadsByHash"/> and helper structures <see cref="assignedDownloadsSorted"/> and <see cref="assignedHeadersByPeerId"/>.
/// </summary>
/// <remarks>Have to be locked by <see cref="assignedLock"/>.</remarks>
/// <param name="assignment">The assignment.</param>
private void AddAssignedDownloadLocked(AssignedDownload assignment)
{
this.assignedDownloadsByHash.Add(assignment.Header.HashBlock, assignment);
// Add to assignedHeadersByPeerId.
if (!this.assignedHeadersByPeerId.TryGetValue(assignment.PeerId, out List <ChainedHeader> headersForIds))
{
headersForIds = new List <ChainedHeader>();
this.assignedHeadersByPeerId.Add(assignment.PeerId, headersForIds);
}
headersForIds.Add(assignment.Header);
// Add to assignedDownloadsSorted.
LinkedListNode <AssignedDownload> lastDownload = this.assignedDownloadsSorted.Last;
if ((lastDownload == null) || (lastDownload.Value.Header.Height <= assignment.Header.Height))
{
assignment.LinkedListNode = this.assignedDownloadsSorted.AddLast(assignment);
}
else
{
LinkedListNode <AssignedDownload> current = lastDownload;
while ((current.Previous != null) && (current.Previous.Value.Header.Height > assignment.Header.Height))
{
current = current.Previous;
}
assignment.LinkedListNode = this.assignedDownloadsSorted.AddBefore(current, assignment);
}
}
/// <summary>Finds all blocks assigned to a given peer, removes assignments from <see cref="assignedDownloadsByHash"/> and returns removed assignments.</summary>
/// <remarks>Have to be locked by <see cref="assignedLock"/>.</remarks>
private Dictionary <int, List <ChainedHeader> > ReleaseAssignmentsLocked(int peerId)
{
var headersByJobId = new Dictionary <int, List <ChainedHeader> >();
if (this.assignedHeadersByPeerId.TryGetValue(peerId, out List <ChainedHeader> headers))
{
var assignmentsToRemove = new List <AssignedDownload>(headers.Count);
foreach (ChainedHeader header in headers)
{
AssignedDownload assignment = this.assignedDownloadsByHash[header.HashBlock];
if (!headersByJobId.TryGetValue(assignment.JobId, out List <ChainedHeader> jobHeaders))
{
jobHeaders = new List <ChainedHeader>();
headersByJobId.Add(assignment.JobId, jobHeaders);
}
jobHeaders.Add(assignment.Header);
assignmentsToRemove.Add(assignment);
this.logger.LogTrace("Header '{0}' for job ID {1} was released from peer ID {2}.", header, assignment.JobId, peerId);
}
foreach (AssignedDownload assignment in assignmentsToRemove)
{
this.RemoveAssignedDownloadLocked(assignment);
}
}
return(headersByJobId);
}
/// <summary>
/// Removes assigned download from <see cref="assignedDownloadsByHash"/> and helper structures <see cref="assignedDownloadsSorted"/> and <see cref="assignedHeadersByPeerId"/>.
/// </summary>
/// <remarks>Have to be locked by <see cref="assignedLock"/>.</remarks>
/// <param name="assignment">Assignment that should be removed.</param>
private void RemoveAssignedDownloadLocked(AssignedDownload assignment)
{
this.assignedDownloadsByHash.Remove(assignment.Header.HashBlock);
List <ChainedHeader> headersForId = this.assignedHeadersByPeerId[assignment.PeerId];
headersForId.Remove(assignment.Header);
if (headersForId.Count == 0)
{
this.assignedHeadersByPeerId.Remove(assignment.PeerId);
}
this.assignedDownloadsSorted.Remove(assignment.LinkedListNode);
}
/// <summary>
/// Removes assigned download from <see cref="assignedDownloadsByHash"/> and helper structures <see cref="assignedDownloadsSorted"/> and <see cref="assignedHeadersByPeerId"/>.
/// </summary>
/// <remarks>Have to be locked by <see cref="assignedLock"/>.</remarks>
/// <param name="assignment">Assignment that should be removed.</param>
private void RemoveAssignedDownloadLocked(AssignedDownload assignment)
{
this.logger.LogTrace("({0}:'{1}')", nameof(assignment), assignment);
this.assignedDownloadsByHash.Remove(assignment.Header.HashBlock);
List <ChainedHeader> headersForId = this.assignedHeadersByPeerId[assignment.PeerId];
headersForId.Remove(assignment.Header);
if (headersForId.Count == 0)
{
this.assignedHeadersByPeerId.Remove(assignment.PeerId);
}
this.assignedDownloadsSorted.Remove(assignment.LinkedListNode);
this.logger.LogTrace("(-)");
}