public StringDB5_0_0LowlevelDatabaseIODevice
(
[NotNull] Stream stream,
Func <BinaryReader, int, byte[]> buffer,
bool leaveStreamOpen = false
)
{
_buffer = buffer;
_stream = new StreamCacheMonitor(stream);
_br = new BinaryReader(_stream, Encoding.UTF8, leaveStreamOpen);
_bw = new BinaryWriter(_stream, Encoding.UTF8, leaveStreamOpen);
if (_stream.Length < 8)
{
_bw.Write(0L);
Seek(0);
}
JumpPos = _br.ReadInt64();
// we have to inc/dec jumppos since we write the index
if (JumpPos > 0)
{
JumpPos--;
}
}
public StringDB10_0_0LowlevelDatabaseIODevice
(
[NotNull] Stream stream,
bool leaveStreamOpen = false
)
{
// We wrap the stream in this so that lookups to Position and Length are quick and snappy.
// This is to prevent a performance concern regarding EOF using excessive amounts of time.
// This has the issue of being cached, but calling IODevice.Reset should fix it right up.
// Of course, this has bad implications and might be reverted later, but it definitely
// fixes the performance gap without making the code ugly.
_stream = new StreamCacheMonitor(stream);
_br = new BinaryReader(_stream, Encoding.UTF8, leaveStreamOpen);
_bw = new BinaryWriter(_stream, Encoding.UTF8, leaveStreamOpen);
JumpPos = ReadBeginning();
}
public StringDB10_0_0LowlevelDatabaseIODevice
(
[NotNull] Stream stream,
bool leaveStreamOpen = false
)
{
// use a buffer when performing single byte writes since writing a single byte
// allocates a new byte array every time, and that's a very costly operation.
// the size of this buffer is artificial.
// We wrap the stream in this so that lookups to Position and Length are quick and snappy.
// This is to prevent a performance concern regarding EOF using excessive amounts of time.
// This has the issue of being cached, but calling IODevice.Reset should fix it right up.
// Of course, this has bad implications and might be reverted later, but it definitely
// fixes the performance gap without making the code ugly.
StreamCacheMonitor = new StreamCacheMonitor(stream);
_br = new BinaryReader(StreamCacheMonitor, Encoding.UTF8, leaveStreamOpen);
_bw = new BinaryWriter(StreamCacheMonitor, Encoding.UTF8, leaveStreamOpen);
JumpPos = ReadBeginning();
}
public void Flush()
{
_bw.Flush();
StreamCacheMonitor.Flush();
}
public void Reset()
{
StreamCacheMonitor.UpdateCache();
Seek(sizeof(long));
}
