public override void Open()
{
_indexAndHeaderStorage.Open();
_appendOnlyDataStorage.Open();
_compressedStorage.Open();
_indexAndHeaderStorage.SetPositionOffset(0);
_indexAndHeaderStorage.ReadStructure(ref _header);
Initialize();
if (_header.CompressedBlocksCount > 0)
{
var offsetsBufferBytesCount = _header.CompressedBlocksCount * 8;
var offsetsBuffer = new byte[offsetsBufferBytesCount];
_indexAndHeaderStorage.ReadStructureArray(offsetsBuffer);
var offsets = MemoryMarshal.Cast <byte, long>(offsetsBuffer);
for (int i = 0; i < _header.CompressedBlocksCount; i++)
{
_blockOffsets.Add(offsets[i]);
}
}
}
public RaxLogEntry[] GetLogs(long minTimestamp, long maxTimestamp, long skipLogs = 0, long takeLogs = long.MaxValue)
{
var range = GetLogsRange(minTimestamp, maxTimestamp, skipLogs, takeLogs);
var result = new RaxLogEntry[range.LogsCount];
if (range.LogsCount == 0)
{
return(result);
}
// MAX_SELECT_LOGS_BUFFER
var bufferSize = range.LogsCount * _logSize;
var buffer = new byte[bufferSize];
_logsStorage.SetPositionOffset(range.FromLogIndex * _logSize);
_logsStorage.ReadStructureArray(buffer);
var logs = MemoryMarshal.Cast <byte, RaxFixedSizeLogEntry>(buffer);
var fromLog = logs[0];
var toLog = logs[logs.Length - 1];
var fromOffset = fromLog.DataOffset;
var toOffset = toLog.DataOffset;
var logsBytesData = toOffset + toLog.TextLengthInBytes + toLog.CategoriesCount * 8;
// MAX_SELECT_LOGS_BUFFER
var dataBuffer = new byte[logsBytesData];
_logsDataStorage.SetPositionOffset(fromOffset);
_logsDataStorage.ReadStructureArray(dataBuffer);
var dataBufferSpan = dataBuffer.AsSpan();
var dataOffset = 0;
for (int i = 0; i < logs.Length; i++)
{
var log = logs[i];
var dataSpanBegin = dataBufferSpan.Slice(dataOffset);
var text = new string(MemoryMarshal.Cast <byte, char>(dataSpanBegin.Slice(0, log.TextLengthInBytes)));
var datetime = new DateTime(log.Timestamp);
var categories = new string[log.CategoriesCount];
var logCategoriesSpan = MemoryMarshal.Cast <byte, long>(dataSpanBegin.Slice(log.TextLengthInBytes, log.CategoriesCount * 8));
for (int catIndex = 0; catIndex < log.CategoriesCount; catIndex++)
{
categories[catIndex] = _categoriesByIndex[logCategoriesSpan[catIndex]].CategoryName;
}
result[i] = new RaxLogEntry
{
Text = text,
Date = datetime,
Categories = categories
};
dataOffset += ComputeLogDataSizeInBytes(text.Length, log.CategoriesCount);
}
return(result);
}