public byte[] Retrieve(ulong pageId, BrightstarProfiler profiler)
{
using (profiler.Step("PageStore.Retrieve"))
{
if (!_readonly && pageId >= _newPageOffset)
{
var newPage = _newPages[(int) (pageId - _newPageOffset)];
return newPage.Data;
}
var page = PageCache.Instance.Lookup(_path, pageId) as FilePage;
if (page != null)
{
profiler.Incr("PageCache Hit");
return page.Data;
}
using (profiler.Step("Load Page"))
{
profiler.Incr("PageCache Miss");
using (profiler.Step("Create FilePage"))
{
// Lock on stream to prevent attempts to concurrently load a page
lock (_stream)
{
page = new FilePage(_stream, pageId, _pageSize);
}
}
using (profiler.Step("Add FilePage To Cache"))
{
PageCache.Instance.InsertOrUpdate(_path, page);
}
return page.Data;
}
}
}
public byte[] Retrieve(ulong pageId, BrightstarProfiler profiler)
{
using (profiler.Step("PageStore.Retrieve"))
{
if (!_readonly && pageId >= _newPageOffset)
{
var newPage = _newPages[(int)(pageId - _newPageOffset)];
return(newPage.Data);
}
var page = PageCache.Instance.Lookup(_path, pageId) as FilePage;
if (page != null)
{
profiler.Incr("PageCache Hit");
return(page.Data);
}
using (profiler.Step("Load Page"))
{
profiler.Incr("PageCache Miss");
using (profiler.Step("Create FilePage"))
{
// Lock on stream to prevent attempts to concurrently load a page
lock (_stream)
{
page = new FilePage(_stream, pageId, _pageSize);
}
}
using (profiler.Step("Add FilePage To Cache"))
{
PageCache.Instance.InsertOrUpdate(_path, page);
}
return(page.Data);
}
}
}
public ulong Create()
{
if (_readonly)
{
throw new InvalidOperationException("Cannot create new pages in readonly page store");
}
var dataPage = new FilePage(_nextPageId, _pageSize);
_newPages.Add(dataPage);
_nextPageId++;
return(dataPage.Id);
}
public IPage Retrieve(ulong pageId, BrightstarProfiler profiler)
{
using (profiler.Step("PageStore.Retrieve"))
{
if (!_readonly && pageId >= _newPageOffset)
{
var newPageRef = _newPages[(int)(pageId - _newPageOffset)];
if (newPageRef.IsAlive)
{
var newPage = newPageRef.Target as IPage;
if (newPage != null)
{
return(newPage);
}
}
}
var page = PageCache.Instance.Lookup(_path, pageId) as IPage;
if (page != null)
{
profiler.Incr("PageCache Hit");
return(page);
}
if (_backgroundPageWriter != null)
{
// See if the page is currently queued for background write
if (_backgroundPageWriter.TryGetPage(pageId, out page))
{
profiler.Incr("BackgroundWriter Queue Hit");
return(page);
}
}
using (profiler.Step("Load Page"))
{
profiler.Incr("PageCache Miss");
using (profiler.Step("Create FilePage"))
{
page = new FilePage(_stream, pageId, _pageSize);
if (_backgroundPageWriter != null)
{
_backgroundPageWriter.ResetTimestamp(pageId);
}
#if DEBUG_PAGESTORE
Logging.LogDebug("Load {0} {1}", pageId, BitConverter.ToInt32(page.Data, 0));
#endif
}
using (profiler.Step("Add FilePage To Cache"))
{
PageCache.Instance.InsertOrUpdate(_path, page);
}
return(page);
}
}
}
public IPage Create(ulong commitId)
{
if (_readonly)
{
throw new InvalidOperationException("Cannot create new pages in readonly page store");
}
var dataPage = new FilePage(_nextPageId, _pageSize);
_newPages.Add(new WeakReference(dataPage));
_nextPageId++;
PageCache.Instance.InsertOrUpdate(_path, dataPage);
return(dataPage);
}
public IPage Retrieve(ulong pageId, BrightstarProfiler profiler)
{
using (profiler.Step("PageStore.Retrieve"))
{
if (!_readonly && pageId >= _newPageOffset)
{
var newPageRef = _newPages[(int)(pageId - _newPageOffset)];
if (newPageRef.IsAlive)
{
var newPage = newPageRef.Target as IPage;
if (newPage != null)
{
return(newPage);
}
}
}
var page = PageCache.Instance.Lookup(_path, pageId) as IPage;
if (page != null)
{
profiler.Incr("PageCache Hit");
return(page);
}
using (profiler.Step("Load Page"))
{
profiler.Incr("PageCache Miss");
using (profiler.Step("Create FilePage"))
{
page = new FilePage(_stream, pageId, _pageSize);
#if DEBUG_PAGESTORE
Logging.LogDebug("Load {0} {1}", pageId, BitConverter.ToInt32(page.Data, 0));
#endif
}
using (profiler.Step("Add FilePage To Cache"))
{
PageCache.Instance.InsertOrUpdate(_path, page);
}
return(page);
}
}
}
public IPage Create(ulong commitId)
{
if (_readonly) throw new InvalidOperationException("Cannot create new pages in readonly page store");
var dataPage = new FilePage(_nextPageId, _pageSize);
_newPages.Add(new WeakReference(dataPage));
_nextPageId++;
PageCache.Instance.InsertOrUpdate(_path, dataPage);
return dataPage;
}
public IPage Retrieve(ulong pageId, BrightstarProfiler profiler)
{
using (profiler.Step("PageStore.Retrieve"))
{
if (!_readonly && pageId >= _newPageOffset)
{
var newPageRef = _newPages[(int) (pageId - _newPageOffset)];
if (newPageRef.IsAlive)
{
var newPage = newPageRef.Target as IPage;
if (newPage != null) return newPage;
}
}
var page = PageCache.Instance.Lookup(_path, pageId) as IPage;
if (page != null)
{
profiler.Incr("PageCache Hit");
return page;
}
using (profiler.Step("Load Page"))
{
profiler.Incr("PageCache Miss");
using (profiler.Step("Create FilePage"))
{
page = new FilePage(_stream, pageId, _pageSize);
#if DEBUG_PAGESTORE
Logging.LogDebug("Load {0} {1}", pageId, BitConverter.ToInt32(page.Data, 0));
#endif
}
using (profiler.Step("Add FilePage To Cache"))
{
PageCache.Instance.InsertOrUpdate(_path, page);
}
return page;
}
}
}
public IPage Retrieve(ulong pageId, BrightstarProfiler profiler)
{
using (profiler.Step("PageStore.Retrieve"))
{
if (!_readonly && pageId >= _newPageOffset)
{
var newPageRef = _newPages[(int) (pageId - _newPageOffset)];
if (newPageRef.IsAlive)
{
var newPage = newPageRef.Target as IPage;
if (newPage != null) return newPage;
}
}
var page = PageCache.Instance.Lookup(_path, pageId) as IPage;
if (page != null)
{
profiler.Incr("PageCache Hit");
return page;
}
if (_backgroundPageWriter != null)
{
// See if the page is currently queued for background write
if (_backgroundPageWriter.TryGetPage(pageId, out page))
{
profiler.Incr("BackgroundWriter Queue Hit");
return page;
}
}
using (profiler.Step("Load Page"))
{
profiler.Incr("PageCache Miss");
using (profiler.Step("Create FilePage"))
{
page = new FilePage(_stream, pageId, _pageSize);
if (_backgroundPageWriter != null)
{
_backgroundPageWriter.ResetTimestamp(pageId);
}
#if DEBUG_PAGESTORE
Logging.LogDebug("Load {0} {1}", pageId, BitConverter.ToInt32(page.Data, 0));
#endif
}
using (profiler.Step("Add FilePage To Cache"))
{
PageCache.Instance.InsertOrUpdate(_path, page);
}
return page;
}
}
}
public ulong Create()
{
if (_readonly) throw new InvalidOperationException("Cannot create new pages in readonly page store");
var dataPage = new FilePage(_nextPageId, _pageSize);
_newPages.Add(dataPage);
_nextPageId++;
return dataPage.Id;
}