public Store(string storeLocation, IPageStore dataPageStore, IResourceTable resourceTable)
{
DirectoryPath = storeLocation;
_pageStore = dataPageStore;
_graphIndex = new ConcurrentGraphIndex(_pageStore);
_subjectRelatedResourceIndex = new RelatedResourceIndex.RelatedResourceIndex(_currentTxnId + 1, _pageStore);
_objectRelatedResourceIndex = new RelatedResourceIndex.RelatedResourceIndex(_currentTxnId + 1, _pageStore);
_prefixManager = new PrefixManager(_pageStore);
_resourceTable = resourceTable;
_resourceIndex = new ResourceIndex.ResourceIndex(1, _pageStore, _resourceTable);
}
public Store(string storeLocation, IPageStore dataPageStore, IResourceTable resourceTable)
{
DirectoryPath = storeLocation;
_pageStore = dataPageStore;
_graphIndex = new ConcurrentGraphIndex(_pageStore);
_subjectRelatedResourceIndex = new RelatedResourceIndex.RelatedResourceIndex(_currentTxnId + 1, _pageStore);
_objectRelatedResourceIndex = new RelatedResourceIndex.RelatedResourceIndex(_currentTxnId + 1, _pageStore);
_prefixManager = new PrefixManager(_pageStore);
_resourceTable = resourceTable;
_resourceIndex = new ResourceIndex.ResourceIndex(1, _pageStore, _resourceTable);
}
/*
* Data format for the store page:
*
* 00-03: Store format version (int)
* 04-11: Transaction id (ulong)
* 12-19: Graph Index start page id (ulong)
* 20-27: Prefix Manager start page id (ulong)
* 28-35: Resource Index start page id (ulong)
* 36-43: Subject Related Resource Index start page id (ulong)
* 44-51: Object Related Resource Index start page id (ulong)
* 44-107: Reserved (all zeros for now)
* 108-127: SHA1 hash of bytes 00-108
* 128-255: Repeat of the above structure
*/
private bool Load(IPage storePage, BrightstarProfiler profiler)
{
using (profiler.Step("Store.Load"))
{
// Validate the hash for the index bloc
using (var sha1 = new SHA1Managed())
{
var recordedHash = new byte[20];
Array.Copy(storePage.Data, 108, recordedHash, 0, 20);
var calculatedHash = sha1.ComputeHash(storePage.Data, 0, 108);
if (recordedHash.Compare(calculatedHash) != 0)
{
return(false);
}
}
// Load indexes from the pointers
int storeVersion = BitConverter.ToInt32(storePage.Data, 0);
if (storeVersion == 1)
{
_currentTxnId = BitConverter.ToUInt64(storePage.Data, 4);
var graphIndexId = BitConverter.ToUInt64(storePage.Data, 12);
_graphIndex = new ConcurrentGraphIndex(_pageStore, graphIndexId, profiler);
var prefixManagerId = BitConverter.ToUInt64(storePage.Data, 20);
_prefixManager = new PrefixManager(_pageStore, prefixManagerId, profiler);
var resourceIndexId = BitConverter.ToUInt64(storePage.Data, 28);
_resourceIndex = new ResourceIndex.ResourceIndex(_pageStore, _resourceTable, resourceIndexId);
var relatedResourceIndexId = BitConverter.ToUInt64(storePage.Data, 36);
_subjectRelatedResourceIndex = new RelatedResourceIndex.RelatedResourceIndex(_pageStore,
relatedResourceIndexId, profiler);
var objectRelatedResourceIndexId = BitConverter.ToUInt64(storePage.Data, 44);
_objectRelatedResourceIndex = new RelatedResourceIndex.RelatedResourceIndex(_pageStore,
objectRelatedResourceIndexId, profiler);
}
return(true);
}
}
/*
* Data format for the store page:
*
* 00-03: Store format version (int)
* 04-11: Transaction id (ulong)
* 12-19: Graph Index start page id (ulong)
* 20-27: Prefix Manager start page id (ulong)
* 28-35: Resource Index start page id (ulong)
* 36-43: Subject Related Resource Index start page id (ulong)
* 44-51: Object Related Resource Index start page id (ulong)
* 44-107: Reserved (all zeros for now)
* 108-127: SHA1 hash of bytes 00-108
* 128-255: Repeat of the above structure
*/
private bool Load(IPage storePage, BrightstarProfiler profiler)
{
using (profiler.Step("Store.Load"))
{
// Validate the hash for the index bloc
using (var sha1 = new SHA1Managed())
{
var recordedHash = new byte[20];
Array.Copy(storePage.Data, 108, recordedHash, 0, 20);
var calculatedHash = sha1.ComputeHash(storePage.Data, 0, 108);
if (recordedHash.Compare(calculatedHash) != 0)
{
return false;
}
}
// Load indexes from the pointers
int storeVersion = BitConverter.ToInt32(storePage.Data, 0);
if (storeVersion == 1)
{
_currentTxnId = BitConverter.ToUInt64(storePage.Data, 4);
var graphIndexId = BitConverter.ToUInt64(storePage.Data, 12);
_graphIndex = new ConcurrentGraphIndex(_pageStore, graphIndexId, profiler);
var prefixManagerId = BitConverter.ToUInt64(storePage.Data, 20);
_prefixManager = new PrefixManager(_pageStore, prefixManagerId, profiler);
var resourceIndexId = BitConverter.ToUInt64(storePage.Data, 28);
_resourceIndex = new ResourceIndex.ResourceIndex(_pageStore, _resourceTable, resourceIndexId);
var relatedResourceIndexId = BitConverter.ToUInt64(storePage.Data, 36);
_subjectRelatedResourceIndex = new RelatedResourceIndex.RelatedResourceIndex(_pageStore,
relatedResourceIndexId, profiler);
var objectRelatedResourceIndexId = BitConverter.ToUInt64(storePage.Data, 44);
_objectRelatedResourceIndex = new RelatedResourceIndex.RelatedResourceIndex(_pageStore,
objectRelatedResourceIndexId, profiler);
}
return true;
}
}
