public void Put(VolumePagePtr pPage, PageInfo info, ArraySegment <byte> content)
{
EnsureObjectNotDisposed();
if (!Enabled)
{
return;
}
var tbl = getVolumeTable(pPage.VolumeId);
var item = new _entry
{
Info = info,
Data = new byte[content.Count]
};
Array.Copy(content.Array, content.Offset, item.Data, 0, content.Count);
int?maxAge = LifeTimeSec;
if (maxAge.Value <= 0)
{
maxAge = null;
}
//since pageId can not be less than 1 we use negative pageIds for storing PageInfo without the byte array
tbl.Put(pPage.PageId, item, maxAge); //store the full item
tbl.Put(-pPage.PageId, info, maxAge); //store just the pageInfo with reverse index
}
public bool Contains(VolumePagePtr pPage)
{
EnsureObjectNotDisposed();
if (!Enabled)
{
return(false);
}
var tbl = getVolumeTable(pPage.VolumeId);
return(tbl.ContainsKey(pPage.PageId));
}
public bool TryGet(VolumePagePtr pPage, out PageInfo info)
{
EnsureObjectNotDisposed();
if (!Enabled)
{
info = default(PageInfo);
return(false);
}
var tbl = getVolumeTable(pPage.VolumeId);
var cached = tbl.Get(-pPage.PageId);//the pageInfo is stored with flipped pageId
if (cached is PageInfo pi)
{
info = pi;
return(true);
}
info = default(PageInfo);
return(false);
}
public bool TryGet(VolumePagePtr pPage, MemoryStream pageData, out PageInfo info)
{
EnsureObjectNotDisposed();
if (!Enabled)
{
info = default(PageInfo);
return(false);
}
var tbl = getVolumeTable(pPage.VolumeId);
var cached = tbl.Get(pPage.PageId) as _entry;
if (cached == null)
{
info = default(PageInfo);
return(false);
}
info = cached.Info;
pageData.Write(cached.Data, 0, cached.Data.Length);
return(true);
}