/// <summary>
/// Create/Get Data Store for IPersistent typed Key and "Simple typed" Value.
/// NOTE: Simple type means one of the integer, numeric(decimals,...), char data types, byte array
/// or a string
/// </summary>
/// <typeparam name="TKey"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="createIfNotExist"></param>
/// <param name="container"></param>
/// <param name="comparer"></param>
/// <param name="name"></param>
/// <param name="isDataInKeySegment"> </param>
/// <param name="mruManaged"> </param>
/// <returns></returns>
public ISortedDictionary <TKey, TValue> GetPersistentKey <TKey, TValue>(object container, string name,
System.Collections.Generic.IComparer <TKey> comparer = null,
bool createIfNotExist = true,
bool isDataInKeySegment = true,
bool mruManaged = true)
where TKey : IPersistent, new()
{
if (!CollectionOnDisk.IsSimpleType(typeof(TValue)))
{
throw new ArgumentException(string.Format("Type of TValue ({0}) isn't an SOP simple type.",
typeof(TValue)));
}
BTreeAlgorithm.CurrentOnValueUnpack =
PersistentTypeKeySimpleValue <TKey, TValue> .Collection_OnKeyUnpack;
var r2 = CreateDictionary <PersistentTypeKeySimpleValue <TKey, TValue>, TKey, TValue>(createIfNotExist,
container, name,
containerDod =>
{
var
r =
new PersistentTypeKeySimpleValue
<TKey,
TValue
>(
container,
comparer,
name,
DataStoreType
.
SopOndisk,
null,
isDataInKeySegment);
containerDod.
SetCurrentValueInMemoryData
(r);
return(r);
}, mruManaged);
return(r2);
}
/// <summary>
/// Pack serializes this node to the Stream.
/// </summary>
/// <param name="parent"></param>
/// <param name="writer"></param>
public void Pack(IInternalPersistent parent, System.IO.BinaryWriter writer)
{
//** Pack the Node data
writer.Write(Count);
writer.Write(HintSizeOnDisk);
writer.Write(ParentAddress);
#region a.) Write children node addresses...
short ii = 0;
if (ChildrenAddresses != null)
{
for (; ii <= Count; ii++)
{
writer.Write(ChildrenAddresses[ii]);
}
}
#endregion
#region b.) Write fillers for future children...
for (; ii <= Slots.Length; ii++)
{
writer.Write(-1L);
}
#endregion
bool? isKeySimpleType = null;
object simpleKey = null;
var parentTree = (BTreeAlgorithm)parent;
byte[] keyOfEmptySlots = null;
int keySizeOnDisk = parentTree.HintKeySizeOnDisk;
if (keySizeOnDisk > 0)
{
keyOfEmptySlots = new byte[keySizeOnDisk];
}
//** Pack each Item's Key & Value if in Key region...
for (short i = 0; i < Slots.Length; i++)
{
if (isKeySimpleType == null)
{
isKeySimpleType = Slots[i] != null &&
(CollectionOnDisk.IsSimpleType(Slots[i].Key) || Slots[i].Key is string);
if (isKeySimpleType.Value)
{
simpleKey = Slots[i].Key;
}
}
if (i < Count)
{
// Pack Node item key and/or value (if value is in key segment)
PackSlotItem(parentTree, writer, Slots[i], ref keySizeOnDisk, isKeySimpleType);
if (keyOfEmptySlots == null || keySizeOnDisk > keyOfEmptySlots.Length)
{
parentTree.HintKeySizeOnDisk = keySizeOnDisk;
keyOfEmptySlots = new byte[keySizeOnDisk];
}
}
else
{
// Pack fillers so a Node can be kept in a contiguous space on disk... (fragmentation is costly)
PackSlotFillers(parentTree, writer, simpleKey, ref keySizeOnDisk, ref keyOfEmptySlots);
}
}
}