public void Delete(T t)
{
using (var _dataIndexFile = new BlobIndexFile(_dataIndexFilePath, DiskBufferSizes.Larger, DiskBufferSizes.Default))
{
var searchKey = InternalReflectionHelper.GetPropertyValueInt32 <T>(t, "Id");
var dataIndex = _dataIndexFile.FindIndex(searchKey);
if (dataIndex == null)
{
return;
}
using (var _deletedDataIndexFile = new BlobIndexFile(_deletedDataIndexFilePath, DiskBufferSizes.Larger, DiskBufferSizes.Default))
{
// create a new deleted data index in deleted file pointing to deleted data.
_deletedDataIndexFile.AddIndexOverwriteDeleted(dataIndex);
}
// no need to delete the data just mark the index entry as deleted
_dataIndexFile.RemoveIndex(searchKey);
// update the record count.
var header = GetDataHeader();
header.RemoveRecord();
UpdateDataHeader(header);
}
}
public T Update(T entity)
{
if (entity == null)
{
throw new ArgumentNullException("Entity argument can't be null");
}
// make sure the entity name matches the document store type.
string requiredEntityName = entity.GetType().Name;
if (_entityName != requiredEntityName)
{
throw new ArgumentException("Entity type is not valid for this data store.");
}
// make sure entity has key field
if (!InternalReflectionHelper.PropertyExists(entity, "Id"))
{
throw new Exception("Entity must have an Id property and be of type short, integer or long." +
"This is used as the primary key for the entity being stored.");
}
// load the document key from the entity as its needed for adding to the index.
var documentKey = InternalReflectionHelper.GetPropertyValueInt64(entity, "Id");
using (var _dataIndexFile = new BlobIndexFile(_dataIndexFilePath, DiskBufferSizes.Larger, DiskBufferSizes.Default))
{
// search the data store for the document.
var dataIndex = _dataIndexFile.FindIndex(documentKey);
if (dataIndex == null)
{
throw new Exception("Could not find an existing entity to update.");
}
// either overwrite entity in existing data slot or append to the the end of the file.
// parse the document into a binary json document
byte[] binaryJson = _serializer.Serialize <T>(entity);
// write the data record to the data file
// update the record index to the documents data size.
dataIndex.UpdateRecordLength(binaryJson.Length);
using (var _fileStreamWriter = new FileStream(_dataFilePath, FileMode.OpenOrCreate, FileAccess.Write, FileShare.Read,
(int)DiskBufferSizes.Default, FileOptions.SequentialScan))
{
using (var _binaryWriter = new BinaryWriter(_fileStreamWriter))
{
// check to see if the record needs relocated.
// if it does then set the position to the end of the file.
if (dataIndex.RequiresRelocation == true)
{
using (var _deletedDataIndexFile = new BlobIndexFile(_deletedDataIndexFilePath, DiskBufferSizes.Larger, DiskBufferSizes.Default))
{
// create a deleted record pointer to the data file.
_deletedDataIndexFile.AddIndexOverwriteDeleted(dataIndex);
}
// set position of the document to the end of the file
_binaryWriter.BaseStream.Position = this.FileSize;
// update the record pointer in the data index
dataIndex.UpdateRecordPointer(_binaryWriter.BaseStream.Position, this.PaddingFactor);
// update the file size.
this.FileSize = this.FileSize + dataIndex.RecordLength + dataIndex.PaddingLength;
}
else
{
// set the position of where the document is in the datafile.
_binaryWriter.BaseStream.Position = dataIndex.Pointer;
}
// make changes to the data
_binaryWriter.Write(binaryJson);
// write the padding bytes
if (dataIndex.PaddingLength > 0)
{
_binaryWriter.Write(new Byte[dataIndex.PaddingLength]);
}
// update data index pointer to point to new location.
_dataIndexFile.UpdateIndex(dataIndex);
// save the data
_binaryWriter.Flush();
}
}
}
return(entity);
}
public T Create(T entity)
{
if (entity == null)
{
throw new ArgumentNullException("Entity argument can't be null");
}
// make sure the entity name matches the document store type.
string requiredEntityName = entity.GetType().Name;
if (_entityName != requiredEntityName)
{
throw new ArgumentException("Entity type is not valid for this data store.");
}
// make sure entity has key field
if (!InternalReflectionHelper.PropertyExists(entity, "Id"))
{
throw new Exception("Entity must have an Id property and be of type short, integer or long." +
"This is used as the primary key for the entity being stored.");
}
// load the document key from the entity as its needed for adding to the index.
var documentKey = InternalReflectionHelper.GetPropertyValueInt64(entity, "Id");
// get the data store header so we can generate keys and store record counts.
var header = GetDataHeader();
// boolean so we know to check for duplicate or not on insert.
// duplicates only need checked when the user has specified the document key.
bool checkForDuplicate = true;
if (documentKey == 0)
{
checkForDuplicate = false;
}
// get the next document key from the data file header record.
documentKey = header.GenerateNextRecord(documentKey);
// update the entity value so that the callers entity gets the saved document key.
InternalReflectionHelper.SetPropertyValue(entity, "Id", documentKey);
// parse the document into a binary json document for storing in the data file.
byte[] binaryJson = _serializer.Serialize <T>(entity);
using (var _deletedDataIndexFile = new BlobIndexFile(_deletedDataIndexFilePath, DiskBufferSizes.Larger, DiskBufferSizes.Default))
{
// create the data index with the data pointer at the end of the document.
// check to see if there is a deleted slot that can be used to store the data.
var dataIndex = _deletedDataIndexFile.GetBlobIndexWithEnoughSpace(binaryJson.Length);
if (dataIndex != null)
{
// assign this document key to the deleted index.
dataIndex.ChangeDocumentKey(documentKey);
dataIndex.UpdateRecordLength(binaryJson.Length);
}
else
{
// create a new data index.
dataIndex = new BlobIndex(documentKey, this.FileSize, binaryJson.Length, this.PaddingFactor);
// update the size of the datafile
this.FileSize = this.FileSize + dataIndex.RecordLength + dataIndex.PaddingLength;
}
using (var _dataIndexFile = new BlobIndexFile(_dataIndexFilePath, DiskBufferSizes.Larger, DiskBufferSizes.Default))
{
// create the data index (AddIndex throws ConcurrencyException so no data will save)
if (checkForDuplicate)
{
_dataIndexFile.AddIndexCheckForDuplicate(dataIndex);
}
else
{
_dataIndexFile.AddIndex(dataIndex);
}
}
// remove the index from the deleted index file if it exists
_deletedDataIndexFile.RemoveIndex(dataIndex.DocumentKey);
using (var _fileStreamWriter = new FileStream(_dataFilePath, FileMode.OpenOrCreate, FileAccess.Write, FileShare.Read,
(int)DiskBufferSizes.Default, FileOptions.SequentialScan))
{
using (var _binaryWriter = new BinaryWriter(_fileStreamWriter))
{
// add the data record to the data file
_binaryWriter.BaseStream.Position = dataIndex.Pointer;
// write the record
_binaryWriter.Write(binaryJson);
// write the padding.
if (dataIndex.PaddingLength > 0)
{
_binaryWriter.Write(new Byte[dataIndex.PaddingLength]);
}
// save the data
_binaryWriter.Flush();
}
}
// update the header record
UpdateDataHeader(header);
}
return(entity);
}
