/// <summary>
/// Performs cleanup of historic data which is not used
/// </summary>
public void Cleanup()
{
lock (cleanupSync)
{
// Clean expired workspaces
trackingWorkspaceStateProvider.Cleanup();
// Determine which snapshots are used
var usedSnapshots = trackingWorkspaceStateProvider.UsedSnapshotIds();
// Ensure that last is always used
var lastSnapshot = snapshotsService.GetLatestSnapshotId();
if (!usedSnapshots.Contains(lastSnapshot))
{
usedSnapshots.Add(lastSnapshot);
}
// Determine which snapshots are not used, remove them from shapshots list
var unusedSnapshots = snapshotsService.RemoveUnusedSnapshots(usedSnapshots);
// Process removed snapshots
foreach (var snapshotId in unusedSnapshots)
{
// Garbage collect nodes which are not used
var collectedNodesEnumerator = collectedNodesProvider.GetEdges(snapshotId);
if (collectedNodesEnumerator != null)
{
using (collectedNodesEnumerator)
{
while (collectedNodesEnumerator.MoveNext())
{
provider.Remove(collectedNodesEnumerator.Current.ToNodeId);
}
}
}
// Remove change set history information
changeSetProvider.RemoveChangeSet(snapshotId);
// Remove information about collected nodes in the snapshot
collectedNodesProvider.Cleanup(snapshotId);
// Remove the snapshot node
provider.Remove(snapshotId);
}
}
}
