/// <summary>
/// Dequeue stack and dispose database on empty stack
/// </summary>
private void CloseDatabase()
{
lock (_mutex)
{
_stack--;
if (_stack == 0)
{
_engine.Dispose();
_engine = null;
_mutex.ReleaseMutex();
}
}
}
/// <summary>
/// Open database in safe mode
/// </summary>
private void OpenDatabase(bool @readonly)
{
lock (_locker)
{
_stack++;
if (_stack == 1)
{
open();
}
// change from read-only to read-write
else if (_settings.ReadOnly == true && @readonly == false && _engine != null)
{
_engine.Dispose();
open();
}
}
void open()
{
try
{
_locker.AcquireLock(@readonly ? LockMode.Read : LockMode.Write, () =>
{
_settings.ReadOnly = @readonly;
_engine = new LiteEngine(_settings);
});
}
catch
{
if (_locker.IsLocked)
{
_locker.ReleaseLock();
}
_stack = 0;
throw;
}
}
}
/// <summary>
/// Open engine as writable and stack operation
/// </summary>
private void OpenWrite()
{
lock (_locker)
{
_stack++;
if (_stack == 1)
{
_locker.AcquireWriterLock();
_settings.ReadOnly = false;
_engine = new LiteEngine(_settings);
}
else if (_settings.ReadOnly)
{
// if database already open in readonly mode, change to writeable mode
_settings.ReadOnly = false;
_engine.Dispose();
_engine = new LiteEngine(_settings);
}
}
}
public override void End()
{
_db.Dispose();
}
public bool Close()
{
_engine.Dispose();
return(true);
}
