private void WriteDBRoot(DBHdr dbRoot)
{
StoragePage rootPage = new StoragePage();
rootPage.AddRecord(dbRoot);
rootPage.WritePageData(this.dataFile, RootPage);
}
// writes a page to persistent storage and does book-keeping for allocated and freed pages
private int aWritePageData(StoragePage page, StorageContext storageContext, int fileAddress)
{
lock (ManagerLock)
{
// store the index of the current page
if (0 <= fileAddress)
{
storageContext.FreedPageList.Add(fileAddress);
}
// write the page
fileAddress = page.WritePageData(
this.dataFile, this.pageManager.GetFreePage());
// store the index of the page we just wrote to
storageContext.AllocatedPageList.Add(fileAddress);
return(fileAddress);
}
}
public void SP_TestReadWritePage()
{
string dataFile = "SP_TestData1.tpdb";
if (File.Exists(dataFile))
{
File.Delete(dataFile);
}
TestData[] pageData =
{
new TestData{data = "Record_0", recordIdx = 0},
new TestData{data = "Record_1", recordIdx = 1},
new TestData{data = "Record_2", recordIdx = 2}
};
int pageIndex = int.MinValue;
// write the page
using (FileStreamWrapper dataFileStream = FileStreamWrapper.CreateObject(dataFile))
{
// populate the page with some data
StoragePage page = new StoragePage();
AddRecords(page, pageData);
// write the file to disk
pageIndex = page.WritePageData(dataFileStream, -1);
}
// read the page
using (FileStreamWrapper dataFileStream = FileStreamWrapper.CreateObject(dataFile))
{
// read page from file
StoragePage page = new StoragePage();
page.ReadPageData(dataFileStream, pageIndex);
// validate the page data
ReadRecords(page, pageData);
}
}
