/// <summary>
/// Finds or creates a new ID for the graph with the specified graph URI
/// </summary>
/// <param name="graphUri">The graph URI to lookup</param>
/// <param name="profiler"></param>
/// <returns>The ID assigned to the graph</returns>
public int AssertGraphId(string graphUri, BrightstarProfiler profiler = null)
{
if (String.IsNullOrEmpty(graphUri))
{
throw new ArgumentException("Graph URI must not be null or an empty string", "graphUri");
}
if (graphUri.Length > short.MaxValue)
{
throw new ArgumentException(
String.Format("Graph URI string exceeds maximum allowed length of {0} bytes", short.MaxValue), "graphUri");
}
#if WINDOWS_PHONE || PORTABLE
lock (_lock)
{
int entryId;
if (_graphUriIndex.TryGetValue(graphUri, out entryId) && !_allEntries[entryId].IsDeleted)
{
return(entryId);
}
var newId = _allEntries.Count;
var entry = new GraphIndexEntry(newId, graphUri, false);
_allEntries.Add(entry);
_graphUriIndex.Add(graphUri, newId);
return(newId);
}
#else
using (profiler.Step("Assert Graph Id"))
{
_lock.EnterUpgradeableReadLock();
try
{
int entryId;
if (_graphUriIndex.TryGetValue(graphUri, out entryId) && !_allEntries[entryId].IsDeleted)
{
return(entryId);
}
_lock.EnterWriteLock();
try
{
var newId = _allEntries.Count;
var entry = new GraphIndexEntry(newId, graphUri, false);
_allEntries.Add(entry);
_graphUriIndex.Add(graphUri, newId);
return(newId);
}
finally
{
_lock.ExitWriteLock();
}
}
finally
{
_lock.ExitUpgradeableReadLock();
}
}
#endif
}
void Read(ulong rootPageId, BrightstarProfiler profiler)
{
IPage currentPage = _pageStore.Retrieve(rootPageId, profiler);
int offset = 0;
int entryIndex = 0;
while (true)
{
var marker = currentPage.Data[offset++];
if (marker == 0xff)
{
ulong nextPageId = BitConverter.ToUInt64(currentPage.Data, _pageStore.PageSize - 8);
if (nextPageId == 0)
{
return;
}
currentPage = _pageStore.Retrieve(nextPageId, profiler);
offset = 0;
}
else if (marker == 2)
{
_allEntries.Add(new GraphIndexEntry(entryIndex++, null, true));
}
else
{
int uriByteLength = BitConverter.ToInt32(currentPage.Data, offset);
offset += 4;
var uri = Encoding.UTF8.GetString(currentPage.Data, offset, uriByteLength);
offset += uriByteLength;
var newEntry = new GraphIndexEntry(entryIndex++, uri, marker == 1);
_allEntries.Add(newEntry);
if (!newEntry.IsDeleted)
{
_graphUriIndex[newEntry.Uri] = newEntry.Id;
}
}
}
}
public void DeleteGraph(int graphId)
{
#if WINDOWS_PHONE || PORTABLE
lock (_lock)
{
if (graphId < _allEntries.Count)
{
var toDelete = _allEntries[graphId];
if (!toDelete.IsDeleted)
{
_allEntries[graphId] = new GraphIndexEntry(toDelete.Id, toDelete.Uri, true);
_graphUriIndex.Remove(toDelete.Uri);
IsDirty = true;
}
}
}
#else
_lock.EnterWriteLock();
try
{
if (graphId < _allEntries.Count)
{
var toDelete = _allEntries[graphId];
if (!toDelete.IsDeleted)
{
_allEntries[graphId] = new GraphIndexEntry(toDelete.Id, toDelete.Uri, true);
_graphUriIndex.Remove(toDelete.Uri);
IsDirty = true;
}
}
}
finally
{
_lock.ExitWriteLock();
}
#endif
}
void Read(ulong rootPageId, BrightstarProfiler profiler)
{
byte[] currentPage = _pageStore.Retrieve(rootPageId, profiler);
int offset = 0;
int entryIndex = 0;
while(true)
{
var marker = currentPage[offset++];
if (marker == 0xff)
{
ulong nextPageId = BitConverter.ToUInt64(currentPage, _pageStore.PageSize - 8);
if (nextPageId == 0) return;
currentPage = _pageStore.Retrieve(nextPageId, profiler);
offset = 0;
}
else if (marker == 2)
{
_allEntries.Add(new GraphIndexEntry(entryIndex++, null, true));
}
else
{
int uriByteLength = BitConverter.ToInt32(currentPage, offset);
offset += 4;
var uri = Encoding.UTF8.GetString(currentPage, offset, uriByteLength);
offset += uriByteLength;
var newEntry = new GraphIndexEntry(entryIndex++, uri, marker == 1);
_allEntries.Add(newEntry);
if (!newEntry.IsDeleted) _graphUriIndex[newEntry.Uri] = newEntry.Id;
}
}
}
public void DeleteGraph(int graphId)
{
#if WINDOWS_PHONE
lock(_lock)
{
if (graphId < _allEntries.Count)
{
var toDelete = _allEntries[graphId];
if (!toDelete.IsDeleted)
{
_allEntries[graphId] = new GraphIndexEntry(toDelete.Id, toDelete.Uri, true);
_graphUriIndex.Remove(toDelete.Uri);
IsDirty = true;
}
}
}
#else
_lock.EnterWriteLock();
try
{
if (graphId < _allEntries.Count)
{
var toDelete = _allEntries[graphId];
if (!toDelete.IsDeleted)
{
_allEntries[graphId] = new GraphIndexEntry(toDelete.Id, toDelete.Uri, true);
_graphUriIndex.Remove(toDelete.Uri);
IsDirty = true;
}
}
}
finally
{
_lock.ExitWriteLock();
}
#endif
}
/// <summary>
/// Finds or creates a new ID for the graph with the specified graph URI
/// </summary>
/// <param name="graphUri">The graph URI to lookup</param>
/// <param name="profiler"></param>
/// <returns>The ID assigned to the graph</returns>
public int AssertGraphId(string graphUri, BrightstarProfiler profiler = null)
{
if (String.IsNullOrEmpty(graphUri))
{
throw new ArgumentException("Graph URI must not be null or an empty string", "graphUri");
}
if (graphUri.Length > short.MaxValue)
{
throw new ArgumentException(
String.Format("Graph URI string exceeds maximum allowed length of {0} bytes", short.MaxValue), "graphUri");
}
#if WINDOWS_PHONE
lock(_lock)
{
int entryId;
if (_graphUriIndex.TryGetValue(graphUri, out entryId) && !_allEntries[entryId].IsDeleted)
{
return entryId;
}
var newId = _allEntries.Count;
var entry = new GraphIndexEntry(newId, graphUri, false);
_allEntries.Add(entry);
_graphUriIndex.Add(graphUri, newId);
return newId;
}
#else
using (profiler.Step("Assert Graph Id"))
{
_lock.EnterUpgradeableReadLock();
try
{
int entryId;
if (_graphUriIndex.TryGetValue(graphUri, out entryId) && !_allEntries[entryId].IsDeleted)
{
return entryId;
}
_lock.EnterWriteLock();
try
{
var newId = _allEntries.Count;
var entry = new GraphIndexEntry(newId, graphUri, false);
_allEntries.Add(entry);
_graphUriIndex.Add(graphUri, newId);
return newId;
}
finally
{
_lock.ExitWriteLock();
}
}
finally
{
_lock.ExitUpgradeableReadLock();
}
}
#endif
}
