private int m_threshold = 256; //256 bytes
public dbSegmentManager(uint nextSegmentId, SegTree segTree, SpaceTree spaceTree, DiskFile file)
{
m_next_segment_id = nextSegmentId;
m_segTree = segTree;
m_cache = new CacheHashtable(m_cacheSize);
m_diskFile = file;
m_spaceTree = spaceTree;
m_LRU = new BNode();
}
private int m_threshold = 256; //256 bytes
public dbSegmentManager(uint nextSegmentId, SegTree segTree, SpaceTree spaceTree, DiskFile file)
{
m_next_segment_id = nextSegmentId;
m_segTree = segTree;
m_cache = new CacheHashtable(m_cacheSize);
m_diskFile = file;
m_spaceTree = spaceTree;
m_LRU = new BNode();
}
/// <summary>
/// Create the internal storage for the dbFile.
/// Note:
/// 1. a helper file for segment managment b-tree is also created if this database file
/// does not exist.
/// </summary>
/// <param name="dbFile"></param>
public ObjectStore(string dbFileName)
{
m_dbFile = new DiskFile(dbFileName);
m_indexFile = new DiskFile(dbFileName+".idx");
m_indexPageManager = new memSegmentManager(m_indexFile);
if (m_indexPageManager.Header.InitializeNeeded)
{
m_indexPageManager.Header.NextSegmentId = 0;
m_indexPageManager.Header.NextObjectId = 0;
m_indexPageManager.Header.NextClassId = 0;
//initialize the segment b-tree's top node id
OOD.Imp.Storage.BNode segTreeTop = new OOD.Imp.Storage.BNode();
m_indexPageManager.GetNewSegment(segTreeTop);
segTreeTop.SetOrder(m_segTreeNodeOrder);
segTreeTop.Leaf = true;
m_indexPageManager.Header.SegmentTreeTopNodeSId = segTreeTop.SegmentID;
//initialize the space b-tree's top node id
BNode spaceTreeTop = new BNode();
m_indexPageManager.GetNewSegment(spaceTreeTop);
spaceTreeTop.SetOrder(m_spaceTreeNodeOrder);
spaceTreeTop.Leaf = true;
m_indexPageManager.Header.FreeSpaceTreeTopNodeSId = spaceTreeTop.SegmentID;
}
m_segmentIndexTree = new SegTree(m_indexPageManager.Header.SegmentTreeTopNodeSId, m_indexPageManager);
m_spaceIndexTree = new SpaceTree(m_indexPageManager.Header.FreeSpaceTreeTopNodeSId, m_indexPageManager, m_dbFile);
m_dbSegmentManager = new dbSegmentManager(
m_indexPageManager.Header.NextSegmentId,
m_segmentIndexTree,
m_spaceIndexTree,
m_dbFile);
if (m_indexPageManager.Header.InitializeNeeded)
{
BNode catalogTop = new BNode();
m_dbSegmentManager.GetNewSegment(catalogTop);
catalogTop.SetOrder(m_catalogTreeNodeOrder);
catalogTop.Leaf = true;
m_indexPageManager.Header.CatalogTreeTopNodeSId = catalogTop.SegmentID;
}
m_catalogTree = new CatalogTree(
m_indexPageManager.Header.CatalogTreeTopNodeSId,
m_dbSegmentManager,
m_indexPageManager.Header.NextClassId);
m_classCache = new LRUHashtable(m_cache_size, m_classCacheLimit);
m_objectTreeCache = new LRUHashtable(m_cache_size, m_objectTreeCacheLimit);
//bring top node's segment tree, space tree, catalog tree into cache, they will be needed anyway
if (!m_indexPageManager.Header.InitializeNeeded)
{
m_indexPageManager.GetSegment(m_segmentIndexTree.TopNodSegId, new BNode(), new KSegId());
m_indexPageManager.GetSegment(m_spaceIndexTree.TopNodeSId, new BNode(), new KOffset());
m_dbSegmentManager.GetSegment(m_catalogTree.TopNodeSId, new BNode(), new KCatalog());
}
}
/// <summary>
/// Create the internal storage for the dbFile.
/// Note:
/// 1. a helper file for segment managment b-tree is also created if this database file
/// does not exist.
/// </summary>
/// <param name="dbFile"></param>
public ObjectStore(string dbFileName)
{
m_dbFile = new DiskFile(dbFileName);
m_indexFile = new DiskFile(dbFileName + ".idx");
m_indexPageManager = new memSegmentManager(m_indexFile);
if (m_indexPageManager.Header.InitializeNeeded)
{
m_indexPageManager.Header.NextSegmentId = 0;
m_indexPageManager.Header.NextObjectId = 0;
m_indexPageManager.Header.NextClassId = 0;
//initialize the segment b-tree's top node id
OOD.Imp.Storage.BNode segTreeTop = new OOD.Imp.Storage.BNode();
m_indexPageManager.GetNewSegment(segTreeTop);
segTreeTop.SetOrder(m_segTreeNodeOrder);
segTreeTop.Leaf = true;
m_indexPageManager.Header.SegmentTreeTopNodeSId = segTreeTop.SegmentID;
//initialize the space b-tree's top node id
BNode spaceTreeTop = new BNode();
m_indexPageManager.GetNewSegment(spaceTreeTop);
spaceTreeTop.SetOrder(m_spaceTreeNodeOrder);
spaceTreeTop.Leaf = true;
m_indexPageManager.Header.FreeSpaceTreeTopNodeSId = spaceTreeTop.SegmentID;
}
m_segmentIndexTree = new SegTree(m_indexPageManager.Header.SegmentTreeTopNodeSId, m_indexPageManager);
m_spaceIndexTree = new SpaceTree(m_indexPageManager.Header.FreeSpaceTreeTopNodeSId, m_indexPageManager, m_dbFile);
m_dbSegmentManager = new dbSegmentManager(
m_indexPageManager.Header.NextSegmentId,
m_segmentIndexTree,
m_spaceIndexTree,
m_dbFile);
if (m_indexPageManager.Header.InitializeNeeded)
{
BNode catalogTop = new BNode();
m_dbSegmentManager.GetNewSegment(catalogTop);
catalogTop.SetOrder(m_catalogTreeNodeOrder);
catalogTop.Leaf = true;
m_indexPageManager.Header.CatalogTreeTopNodeSId = catalogTop.SegmentID;
}
m_catalogTree = new CatalogTree(
m_indexPageManager.Header.CatalogTreeTopNodeSId,
m_dbSegmentManager,
m_indexPageManager.Header.NextClassId);
m_classCache = new LRUHashtable(m_cache_size, m_classCacheLimit);
m_objectTreeCache = new LRUHashtable(m_cache_size, m_objectTreeCacheLimit);
//bring top node's segment tree, space tree, catalog tree into cache, they will be needed anyway
if (!m_indexPageManager.Header.InitializeNeeded)
{
m_indexPageManager.GetSegment(m_segmentIndexTree.TopNodSegId, new BNode(), new KSegId());
m_indexPageManager.GetSegment(m_spaceIndexTree.TopNodeSId, new BNode(), new KOffset());
m_dbSegmentManager.GetSegment(m_catalogTree.TopNodeSId, new BNode(), new KCatalog());
}
}