public void SPT_TestReadWriteTable()
{
int entryCount = 40;
int physicalPageDistance = 5;
string dataFile = "SPT_TestData1.tpdb";
if (File.Exists(dataFile))
{
File.Delete(dataFile);
}
List<int> freedPages = null;
StoragePageManager spaceMgr = new StoragePageManager();
StoragePageTable pageTable2 = new StoragePageTable();
StoragePageTable pageTable = new StoragePageTable();
for (int idx = 0; idx < entryCount; idx++)
{
pageTable.SetLogicalPage(idx + physicalPageDistance);
}
using (FileStreamWrapper dataFileStream = FileStreamWrapper.CreateObject(dataFile))
{
int root = pageTable.WritePageTableData(dataFileStream, spaceMgr, out freedPages);
dataFileStream.Seek(0, SeekOrigin.Begin);
pageTable2.ReadPageTableData(dataFileStream, root);
}
for (int idx = 0; idx < entryCount; idx++)
{
int physicalAddress = pageTable2.GetPhysicalPage(idx);
Assert.AreEqual(idx + physicalPageDistance, physicalAddress);
}
}
/// <summary>
/// Default constructor.
/// </summary>
protected StorageManager()
{
this.activeContextMap = new Dictionary <Transaction, StorageContext>();
this.preparedContextMap = new StorageTransactionTable();
this.pageManager = new StoragePageManager();
this.lockManager = new MyLM();
this.disposed = false;
}
/// <summary>
/// Writes the page table item to persitent storage as a list of items.
/// </summary>
/// <param name="stream">data file</param>
/// <param name="manager">object that keeps track of free pages in the file</param>
/// <param name="freedPages">list of pages to be freed when transaction commits</param>
/// <returns>index of the first page storing the list</returns>
public int WritePageTableData(FileStreamWrapper stream, StoragePageManager manager, out List <int> freedPages)
{
List <int> pageIdxList = null;
// create the writer
ListWriter <PageTableItem> writer = new ListWriter <PageTableItem>();
writer.WriteList(stream, manager, this.pageTable, out pageIdxList);
// update the list that stores the physical page idx
freedPages = this.pageTableStoragePages;
this.pageTableStoragePages = pageIdxList;
// return the index of the first page
return(this.pageTableStoragePages[0]);
}
/// <summary>
/// Writes the index item to persitent storage as a list of items.
/// We handle deletes by setting the "value" in the map to null and
/// not writing any items whose value is null to persistent storage.
/// </summary>
/// <param name="stream">data file to write to</param>
/// <param name="manager">object that keeps track of free pages in the file</param>
/// <param name="freedPages">list of pages to be freed when transaction commits</param>
/// <returns>index of the first page storing the list</returns>
public int WriteIndexData(FileStreamWrapper stream, StoragePageManager manager, out List <int> freedPages)
{
List <int> pageIdxList = null;
// create the writer
ListWriter <IndexItem <T> > writer = new ListWriter <IndexItem <T> >();
writer.WriteList(
stream,
manager,
this.indexMap.Values.Where(c => c != null).ToList(),
out pageIdxList);
// update the list that stores the physical page idx
freedPages = this.indexStoragePages;
this.indexStoragePages = pageIdxList;
// return the index of the first page
return(this.indexStoragePages[0]);
}
/// <summary>
/// Writes the data item to persitent storage as a list of items.
/// </summary>
/// <param name="stream">data file to write to</param>
/// <param name="manager">object that keeps track of free pages in the file</param>
/// <param name="freedPages">list of pages to be freed when transaction commits</param>
/// <returns>index of the first page storing the list</returns>
public int WriteTransactionTableData(FileStreamWrapper stream, StoragePageManager manager, out List<int> freedPages)
{
List<int> pageIdxList = null;
// create the writer
ListWriter<TransItem> writer = new ListWriter<TransItem>();
writer.WriteList(stream, manager, this.contextTable.Values.ToList() , out pageIdxList);
// update the list that stores the physical page idx
freedPages = this.contextTableStoragePages;
this.contextTableStoragePages = pageIdxList;
// return the index of the first page
return this.contextTableStoragePages[0];
}