add front demo in this project

LFtid1056/cloudfront/code/log4cplus/helpers/connectorthread.h

@@ -0,0 +1,107 @@
+// -*- C++ -*-
+//  Copyright (C) 2013-2017, Vaclav Zeman. All rights reserved.
+//  
+//  Redistribution and use in source and binary forms, with or without modifica-
+//  tion, are permitted provided that the following conditions are met:
+//  
+//  1. Redistributions of  source code must  retain the above copyright  notice,
+//     this list of conditions and the following disclaimer.
+//  
+//  2. Redistributions in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//  
+//  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
+//  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+//  FITNESS  FOR A PARTICULAR  PURPOSE ARE  DISCLAIMED.  IN NO  EVENT SHALL  THE
+//  APACHE SOFTWARE  FOUNDATION  OR ITS CONTRIBUTORS  BE LIABLE FOR  ANY DIRECT,
+//  INDIRECT, INCIDENTAL, SPECIAL,  EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLU-
+//  DING, BUT NOT LIMITED TO, PROCUREMENT  OF SUBSTITUTE GOODS OR SERVICES; LOSS
+//  OF USE, DATA, OR  PROFITS; OR BUSINESS  INTERRUPTION)  HOWEVER CAUSED AND ON
+//  ANY  THEORY OF LIABILITY,  WHETHER  IN CONTRACT,  STRICT LIABILITY,  OR TORT
+//  (INCLUDING  NEGLIGENCE OR  OTHERWISE) ARISING IN  ANY WAY OUT OF THE  USE OF
+//  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef LOG4CPLUS_HELPERS_CONNECTORTHREAD_H
+#define LOG4CPLUS_HELPERS_CONNECTORTHREAD_H
+
+#include <log4cplus/config.hxx>
+
+#if defined (LOG4CPLUS_HAVE_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <log4cplus/thread/syncprims.h>
+#include <log4cplus/thread/threads.h>
+#include <log4cplus/helpers/socket.h>
+
+
+#if ! defined (LOG4CPLUS_SINGLE_THREADED)
+
+namespace log4cplus { namespace helpers {
+
+
+class LOG4CPLUS_EXPORT ConnectorThread;
+
+//! Interface implemented by users of ConnectorThread.
+class LOG4CPLUS_EXPORT IConnectorThreadClient
+{
+protected:
+    virtual ~IConnectorThreadClient ();
+
+    //! \return Mutex for synchronization between ConnectorThread and
+    //! its client object. This is usually SharedObject::access_mutex.
+    virtual thread::Mutex const & ctcGetAccessMutex () const = 0;
+
+    //! \return Socket variable in ConnectorThread client to maintain.
+    virtual helpers::Socket & ctcGetSocket () = 0;
+
+    //! \return ConnectorThread client's function returning connected
+    //! socket.
+    virtual helpers::Socket ctcConnect () = 0;
+
+    //! Sets connected flag to true in ConnectorThread's client.
+    virtual void ctcSetConnected () = 0;
+
+    friend class LOG4CPLUS_EXPORT ConnectorThread;
+};
+
+
+//! This class is used by SocketAppender and (remote) SysLogAppender
+//! to provide asynchronous re-connection.
+class LOG4CPLUS_EXPORT ConnectorThread
+    : public thread::AbstractThread
+{
+public:
+    //! \param client reference to ConnectorThread's client object
+    ConnectorThread (IConnectorThreadClient & client);
+    virtual ~ConnectorThread ();
+    
+    virtual void run();
+
+    //! Call this function to terminate ConnectorThread. The function
+    //! sets `exit_flag` and then triggers `trigger_ev` to wake up the
+    //! ConnectorThread.
+    void terminate ();
+
+    //! This function triggers (`trigger_ev`) connection check and
+    //! attempt to re-connect a broken connection, when necessary.
+    void trigger ();
+    
+protected:
+    //! reference to ConnectorThread's client
+    IConnectorThreadClient & ctc;
+
+    //! This event is the re-connection trigger.
+    thread::ManualResetEvent trigger_ev;
+
+    //! When this variable set to true when ConnectorThread is signaled to 
+    bool exit_flag;
+};
+
+
+} } // namespace log4cplus { namespace helpers {
+
+#endif // ! defined (LOG4CPLUS_SINGLE_THREADED)
+
+#endif // LOG4CPLUS_HELPERS_CONNECTORTHREAD_H