public bool Start() { lock (lockObject) { treeSystem = new StoreTreeSystem(store, branchNodeSize, leafNodeSize, heapNodeCacheSize, branchNodeCacheSize); treeSystem.Create(); treeSystem.CheckPoint(); // The actual database StoreTreeSystem treeStore; // Get the header area IArea headerArea = store.GetArea(-1); int magicValue = headerArea.ReadInt4(); // If header area magic value is zero, then we assume this is a brand // new database and initialize it with the configuration information // given. if (magicValue == 0) { // Create a tree store inside the file store, treeStore = new StoreTreeSystem(store, branchNodeSize, leafNodeSize, heapNodeCacheSize, branchNodeCacheSize); // Create the tree and returns a pointer to the tree, long treePointer = treeStore.Create(); // Create an area object with state information about the tree IAreaWriter awriter = store.CreateArea(128); awriter.WriteInt4(0x0101); // The version value awriter.WriteInt8(treePointer); awriter.WriteInt4(branchNodeSize); awriter.WriteInt4(leafNodeSize); awriter.Finish(); long dummy = awriter.Id; IMutableArea harea = store.GetMutableArea(-1); harea.WriteInt4(0x092BA001); // The magic value harea.WriteInt8(awriter.Id); harea.CheckOut(); } else if (magicValue == 0x092BA001) { long apointer = headerArea.ReadInt8(); // The area that contains configuration details, IArea initArea = store.GetArea(apointer); int version = initArea.ReadInt4(); if (version != 0x0101) { throw new IOException("Unknown version in tree initialization area"); } // Read the pointer to the tree store long treePointer = initArea.ReadInt8(); // Read the branch and leaf node sizes as set when the database was // created. int ibranchNodeSize = initArea.ReadInt4(); int ileafNodeSize = initArea.ReadInt4(); // Create the tree store treeStore = new StoreTreeSystem(store, ibranchNodeSize, ileafNodeSize, heapNodeCacheSize, branchNodeCacheSize); // Initialize the tree treeStore.Init(treePointer); } else { throw new IOException("Data is corrupt, invalid magic value in store"); } // Set the point of the tree store treeStore.CheckPoint(); // Set up final internal state and return true treeSystem = treeStore; databaseStarted = true; return(true); } }
private long WriteVersionsList(long versionId, TreeSystemTransaction tran) { lock (this) { // Write the version info and the deleted refs to a new area, NodeId rootNodeId = tran.RootNodeId; if (rootNodeId.IsInMemory) { throw new ApplicationException("Assertion failed, root_node is on heap."); } // Get the list of all nodes deleted in the transaction List <NodeId> deletedRefs = tran.NodeDeletes; // Sort it deletedRefs.Sort(); // Check for any duplicate entries (we shouldn't double delete stuff). for (int i = 1; i < deletedRefs.Count; ++i) { if (deletedRefs[i - 1].Equals(deletedRefs[i])) { // Oops, duplicated delete throw new ApplicationException("PRAGMATIC_CHECK failed: duplicate records in delete list."); } } long theVersionId = WriteSingleVersionInfo(versionId, rootNodeId, deletedRefs); // Now update the version list by copying the list and adding the new ref // to the end. // Get the current version list IMutableArea headerArea = nodeStore.GetMutableArea(headerId); headerArea.Position = 8; long versionListId = headerArea.ReadInt8(); // Read information from the old version info, IArea versionListArea = nodeStore.GetArea(versionListId); versionListArea.ReadInt4(); // The magic int versionCount = versionListArea.ReadInt4(); // Create a new list, IAreaWriter newVersionList = nodeStore.CreateArea(8 + (8 * (versionCount + 1))); newVersionList.WriteInt4(0x01433); newVersionList.WriteInt4(versionCount + 1); for (int i = 0; i < versionCount; ++i) { newVersionList.WriteInt8(versionListArea.ReadInt8()); } newVersionList.WriteInt8(theVersionId); newVersionList.Finish(); // Write the new area to the header, headerArea.Position = 8; headerArea.WriteInt8(newVersionList.Id); // Delete the old version list Area, nodeStore.DeleteArea(versionListId); // Done, return(theVersionId); } }
private void DisposeOldVersions() { List <object> disposeList = new List <object>(); lock (versions) { // size - 1 because we don't want to delete the very last version, int sz = versions.Count - 1; bool foundLockedEntry = false; for (int i = 0; i < sz && foundLockedEntry == false; ++i) { VersionInfo vinfo = versions[i]; // If this version isn't locked, if (vinfo.NotLocked) { // Add to the dispose list disposeList.Add(vinfo); // And delete from the versions list, versions.RemoveAt(i); --sz; --i; } else { // If it is locked, we exit the loop foundLockedEntry = true; } } } // If there are entries to dispose? if (disposeList.Count > 0) { // We synchronize here to ensure the versions list can't be modified by // a commit operation while we are disposing this. lock (this) { // Run within a write lock on the store try { nodeStore.LockForWrite(); // First we write out a modified version header minus the versions we // are to delete, // Get the current version list IMutableArea headerArea = nodeStore.GetMutableArea(headerId); headerArea.Position = 8; long versionListId = headerArea.ReadInt8(); // Read information from the old version info, IArea versionListArea = nodeStore.GetArea(versionListId); versionListArea.ReadInt4(); // The magic int versionCount = versionListArea.ReadInt4(); int newVersionCount = versionCount - disposeList.Count; // Create a new list, IAreaWriter newVersionList = nodeStore.CreateArea(8 + (8 * newVersionCount)); newVersionList.WriteInt4(0x01433); newVersionList.WriteInt4(newVersionCount); // Skip the versions we are deleting, for (int i = 0; i < disposeList.Count; ++i) { versionListArea.ReadInt8(); } // Now copy the list from the new point for (int i = 0; i < newVersionCount; ++i) { newVersionList.WriteInt8(versionListArea.ReadInt8()); } newVersionList.Finish(); // Write the new area to the header, headerArea.Position = 8; headerArea.WriteInt8(newVersionList.Id); // Delete the old version list Area, nodeStore.DeleteArea(versionListId); // Dispose the version info, int sz = disposeList.Count; for (int i = 0; i < sz; ++i) { VersionInfo vinfo = (VersionInfo)disposeList[i]; long vRef = vinfo.VersionInfoRef; IArea versionArea = nodeStore.GetArea(vRef); int magic = versionArea.ReadInt4(); int rev = versionArea.ReadInt4(); // Check the magic, if (magic != 0x04EA23) { throw new ApplicationException("Magic value for version area is incorrect."); } long verId = versionArea.ReadInt8(); long nrnHigh = versionArea.ReadInt8(); long nrnLow = versionArea.ReadInt8(); int nodeCount = versionArea.ReadInt4(); // For each node, for (int n = 0; n < nodeCount; ++n) { // Read the next area long drnHigh = versionArea.ReadInt8(); long drnLow = versionArea.ReadInt8(); NodeId delNodeId = new NodeId(drnHigh, drnLow); // Cleanly disposes the node DoDisposeNode(delNodeId); } // Delete the node header, nodeStore.DeleteArea(vRef); } } finally { nodeStore.UnlockForWrite(); } } } }
public bool Start() { lock (lockObject) { // We can't start a database that is already started, if (databaseStarted || treeSystem != null) { return(false); } // Make a data.koi file with a single TreeSystem structure mapped into it const string fileExt = "cdb"; const string dbFileName = "data"; bufferManager = new LoggingBufferManager(path, path, false, maxPageCount, pageSize, fileExt, fileRolloverSize, logger, true); bufferManager.Start(); // The backing store fileStore = new JournalledFileStore(dbFileName, bufferManager, false); fileStore.Open(); // The actual database StoreTreeSystem treeStore; // Get the header area IArea headerArea = fileStore.GetArea(-1); int magicValue = headerArea.ReadInt4(); // If header area magic value is zero, then we assume this is a brand // new database and initialize it with the configuration information // given. if (magicValue == 0) { // Create a tree store inside the file store, treeStore = new StoreTreeSystem(fileStore, branchNodeSize, leafNodeSize, heapNodeCacheSize, branchNodeCacheSize); // Create the tree and returns a pointer to the tree, long treePointer = treeStore.Create(); // Create an area object with state information about the tree IAreaWriter awriter = fileStore.CreateArea(128); awriter.WriteInt4(0x0101); // The version value awriter.WriteInt8(treePointer); awriter.WriteInt4(branchNodeSize); awriter.WriteInt4(leafNodeSize); awriter.Finish(); long dummy = awriter.Id; IMutableArea harea = fileStore.GetMutableArea(-1); harea.WriteInt4(0x092BA001); // The magic value harea.WriteInt8(awriter.Id); harea.CheckOut(); } else if (magicValue == 0x092BA001) { long apointer = headerArea.ReadInt8(); // The area that contains configuration details, IArea initArea = fileStore.GetArea(apointer); int version = initArea.ReadInt4(); if (version != 0x0101) { throw new IOException("Unknown version in tree initialization area"); } // Read the pointer to the tree store long treePointer = initArea.ReadInt8(); // Read the branch and leaf node sizes as set when the database was // created. int ibranchNodeSize = initArea.ReadInt4(); int ileafNodeSize = initArea.ReadInt4(); // Create the tree store treeStore = new StoreTreeSystem(fileStore, ibranchNodeSize, ileafNodeSize, heapNodeCacheSize, branchNodeCacheSize); // Initialize the tree treeStore.Init(treePointer); } else { throw new IOException("Data is corrupt, invalid magic value in store"); } // Set the point of the tree store treeStore.CheckPoint(); // Set up final internal state and return true treeSystem = treeStore; databaseStarted = true; return(true); } }