public bool IssueCommand(RFC1939.POPCommand command)
{
try
{
if (m_CurrentState.IssueCommand(command, this))
{
OnCommandIssued(this,
new CommandIssuedEventArgs(command));
return(true);
}
}
catch (RFC1939.POPException ex)
{
if (ex.InnerException != null)
{
if (ex.InnerException.InnerException != null)
{
if (ex.InnerException.InnerException is System.Net.Sockets.SocketException)
{
CloseConnection();
CurrentState = DisconnectedState.GetInstane();
return(false);
}
}
}
throw ex;
}
return(false);
}
public static DisconnectedState GetInstane()
{
if (s_State == null)
{
s_State = new DisconnectedState();
}
return(s_State);
}
public POPClient(IMailReader mailreader)
{
m_CurrentState = DisconnectedState.GetInstane();
m_TcpClient = new TcpClient();
m_CommandHistory = new Queue <jingxian.mail.popper.RFC1939.POPCommand>();
m_PollTimer = new System.Timers.Timer();
m_MailReader = mailreader;
mailreader.DataRead += new DataReadEventHandler(OnDataRead);
m_PollTimer.Elapsed += new System.Timers.ElapsedEventHandler(m_PollTimer_Elapsed);
}
/// <summary>
/// 执行命令，如果命令是与登录相关则不执行
/// </summary>
/// <returns>如果返回true,则说明命令执行成功</returns>
public override bool IssueCommand(RFC1939.POPCommand command, POPClient context)
{
if (!IsLegalCommand(command))
{
return(false);
}
if (command is RFC1939.QuitCommand)
{
if (command.Execute())
{
context.LoggCommand(command);
context.CurrentState = DisconnectedState.GetInstane();
return(true);
}
context.CurrentState = DisconnectedState.GetInstane();
context.LoggCommand(command);
}
else if (command is RFC1939.RetriveCommand || command is RFC1939.TopCommand)
{
if (command.Execute())
{
context.LoggCommand(command);
context.CurrentState = ReadingState.GetInstance();
return(true);
}
context.LoggCommand(command);
}
else if (command is RFC1939.NoopCommand)
{
if (command.Execute())
{
context.LoggCommand(command);
return(true);
}
else
{
context.LoggCommand(command);
context.Disconnect();
context.CurrentState = DisconnectedState.GetInstane();
}
}
else
{
if (command.Execute())
{
context.LoggCommand(command);
return(true);
}
context.LoggCommand(command);
}
return(false);
}
public override bool IssueCommand(RFC1939.POPCommand command, POPClient context)
{
if (!IsLegalCommand(command))
{
return(false);
}
if (command is RFC1939.ConnectCommand)
{
if (command.Execute())
{
context.LoggCommand(command);
context.CurrentState = TransactionState.GetInstance();
return(true);
}
context.LoggCommand(command);
}
else if (command is RFC1939.UserCommand)
{
if (command.Execute())
{
context.LoggCommand(command);
return(true);
}
context.LoggCommand(command);
}
else if (command is RFC1939.PassCommand)
{
if (command.Execute())
{
context.LoggCommand(command);
context.CurrentState = TransactionState.GetInstance();
return(true);
}
context.LoggCommand(command);
}
else if (command is RFC1939.QuitCommand)
{
if (command.Execute())
{
context.LoggCommand(command);
context.CurrentState = DisconnectedState.GetInstane();
return(true);
}
context.LoggCommand(command);
}
return(false);
}