Provides a means of storing multitudes of small files inside one big one. I doubt this is a good name for it, but it works. Anyway, the file is broken into fixed size blocks and each block can be chained to another to allow the sub-allocation to grow larger than the block size. This is the primary storage vehicle for the BPlusTree implementation.
Syntax
| Visual Basic (Declaration) | |
|---|
Public Class FragmentedFile |
| C# | |
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public class FragmentedFile |
Example
Library/Library.Test/TestFragmentedFile.cs
| C# |  Copy Code |
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SharedMemoryStream shared = new SharedMemoryStream();
FragmentedFile.CreateNew(shared, 512, 100, 2).Dispose();
using (FragmentedFile ff = new FragmentedFile(shared, 512, 100, 2))
{
long id;
byte[] bytes = MakeBytes(255);
using (Stream write = ff.Create(out id))
using (ITransactable trans = (ITransactable)write)
{
write.Write(bytes, 0, bytes.Length);
trans.Commit();
Assert.AreEqual(bytes, IOStream.ReadAllBytes(ff.Open(id, FileAccess.Read)));
trans.Rollback();
}
AssertThrows<InvalidDataException>(delegate() { ff.Open(id, FileAccess.Read); });
} |
| VB.NET | Copy Code |
|---|
Dim [shared] As New SharedMemoryStream()
FragmentedFile.CreateNew([shared], 512, 100, 2).Dispose()
Using ff As New FragmentedFile([shared], 512, 100, 2)
Dim id As Long
Dim bytes As Byte() = MakeBytes(255)
Using write As Stream = ff.Create(id)
Using trans As ITransactable = DirectCast(write, ITransactable)
write.Write(bytes, 0, bytes.Length)
trans.Commit()
Assert.AreEqual(bytes, IOStream.ReadAllBytes(ff.Open(id, FileAccess.Read)))
trans.Rollback()
End Using
End Using
AssertThrows(Of InvalidDataException)(Function() Do
ff.Open(id, FileAccess.Read)
End Function)
End Using |
Inheritance Hierarchy
Requirements
Target Platforms: Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008, Windows 7
See Also
