private List <UrlCrawlingResult> AccessToVisitedUrls(AccessType accessType, UrlCrawlingResult addingElement = null, int startElem = 0)
{
lock (this)
{
if (_visitedUrls == null)
{
_visitedUrls = new List <UrlCrawlingResult>();
}
switch (accessType)
{
case AccessType.Read:
if (startElem >= _visitedUrls.Count)
{
return(new List <UrlCrawlingResult>());
}
var localResult = new List <UrlCrawlingResult>();
for (var i = startElem; i < _visitedUrls.Count; i++)
{
localResult.Add(_visitedUrls[i]);
}
return(localResult);
case AccessType.Write:
if (addingElement != null)
{
_visitedUrls.Add(addingElement);
}
return(null);
default:
return(null);
}
}
}
/// <summary>
/// Safely adding result to list of results
/// </summary>
private void AddToVisitedUrls(UrlCrawlingResult ucResult)
{
AccessToVisitedUrls(AccessType.Write, ucResult);
}