public static IEnumerable <MessagePageId> GetMessagePages(ClusterPageId clusterPage)
{
var startIndex = clusterPage.Value * PagesOnCluster;
var endIndex = startIndex + PagesOnCluster;
for (var i = startIndex; i < endIndex; i++)
{
yield return(new MessagePageId(i));
}
}
public static MessagePageId GetFirstPageIdOnCompressedPage(this ClusterPageId clusterPage)
{
return(new MessagePageId(clusterPage.Value * PagesOnCluster));
}
public static PagesCluster CreatePagesCluster(this IAzurePageBlob azurePageBlob, string topicId,
ClusterPageId clusterPageId)
{
return(new PagesCluster(azurePageBlob, clusterPageId, topicId));
}
public PagesCluster(IAzurePageBlob azurePageBlob, ClusterPageId clusterPageId, string topicId)
{
TopicId = topicId;
AzurePageBlob = azurePageBlob;
ClusterPageId = clusterPageId;
}
public bool EqualsWith(ClusterPageId clusterPageId)
{
return(clusterPageId.Value == Value);
}
private int GetPageTocIndex(MessagePageId pageId)
{
var firstPageNoOnCompressedPage = ClusterPageId.GetFirstPageIdOnCompressedPage();
return((int)(pageId.Value - firstPageNoOnCompressedPage.Value));
}
public static PagesCluster FindInCache(this List <PagesCluster> cache, string topicId, ClusterPageId clusterPageId)
{
lock (cache)
{
var result = cache.FirstOrDefault(itm => itm.TopicId == topicId && itm.ClusterPageId.EqualsWith(clusterPageId));
if (result == null)
{
return(null);
}
var index = cache.IndexOf(result);
if (index != 0)
{
cache.Remove(result);
cache.Insert(0, result);
}
return(result);
}
}
