private void RecoverSystem(System.Type systemType, CommandLogReader reader, ExceptionDuringRecoveryHandler handler)
{
_system = reader.ReadLastSnapshot();
if (null == _system)
{
_system = System.Activator.CreateInstance(systemType);
}
RecoverCommands(reader, handler);
}
/// <summary>
/// See <see cref="PrevalenceActivator.CreateEngine(System.Type, string)"/>
/// </summary>
/// <param name="systemType"></param>
/// <param name="prevalenceBase"></param>
/// <param name="formatter"></param>
/// <param name="handler"></param>
internal PrevalenceEngine(System.Type systemType, string prevalenceBase, BinaryFormatter formatter, ExceptionDuringRecoveryHandler handler)
{
_clock = new AlarmClock();
CommandLogReader reader = new CommandLogReader(CheckPrevalenceBase(prevalenceBase), formatter);
RecoverSystem(systemType, reader, handler);
_commandLog = reader.ToWriter();
_lock = new ReaderWriterLock();
_decorators = GetCommandDecorators(systemType);
_paused = false;
}
private void RecoverCommands(CommandLogReader reader, ExceptionDuringRecoveryHandler handler)
{
ShareCurrentObject();
try
{
Clock.Pause();
try
{
foreach (ContextRecoveryCommand contextRecoveryCommand in reader)
{
Clock.Recover(contextRecoveryCommand.DateTime);
ICommand command = contextRecoveryCommand.Command;
try
{
command.Execute(_system);
}
catch (System.Exception x)
{
// commands are allowed to throw exceptions
// it is up to the client to decide what to
// do with them
OnExceptionDuringRecovery(handler, command, x);
}
}
}
finally
{
Clock.Resume();
}
}
finally
{
UnshareCurrentObject();
}
}
