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ErrorHandler.h

//
// ErrorHandler.h
//
// $Id: //poco/1.3/Foundation/include/Poco/ErrorHandler.h#1 $
//
// Library: Foundation
// Package: Threading
// Module:  ErrorHandler
//
// Definition of the ErrorHandler class.
//
// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#ifndef Foundation_ErrorHandler_INCLUDED
#define Foundation_ErrorHandler_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/Exception.h"
#include "Poco/Mutex.h"


namespace Poco {


00051 class Foundation_API ErrorHandler
      /// This is the base class for thread error handlers.
      ///
      /// An unhandled exception that causes a thread to terminate is usually
      /// silently ignored, since the class library cannot do anything meaningful
      /// about it.
      /// 
      /// The Thread class provides the possibility to register a
      /// global ErrorHandler that is invoked whenever a thread has
      /// been terminated by an unhandled exception.
      /// The ErrorHandler must be derived from this class and can
      /// provide implementations of all three handleException() overloads.
      ///
      /// The ErrorHandler is always invoked within the context of
      /// the offending thread.
{
public:
      ErrorHandler();
            /// Creates the ErrorHandler.

      virtual ~ErrorHandler();
            /// Destroys the ErrorHandler.

      virtual void exception(const Exception& exc);
            /// Called when a Poco::Exception (or a subclass)
            /// caused the thread to terminate.
            ///
            /// This method should not throw any exception - it would
            /// be silently ignored.
            ///
            /// The default implementation just breaks into the debugger.
            
      virtual void exception(const std::exception& exc);
            /// Called when a std::exception (or a subclass)
            /// caused the thread to terminate.       
            ///
            /// This method should not throw any exception - it would
            /// be silently ignored.
            ///
            /// The default implementation just breaks into the debugger.

      virtual void exception();
            /// Called when an exception that is neither a
            /// Poco::Exception nor a std::exception caused
            /// the thread to terminate.
            ///
            /// This method should not throw any exception - it would
            /// be silently ignored.
            ///
            /// The default implementation just breaks into the debugger.
            
      static void handle(const Exception& exc);
            /// Invokes the currently registered ErrorHandler.
            
      static void handle(const std::exception& exc);
            /// Invokes the currently registered ErrorHandler.
      
      static void handle();
            /// Invokes the currently registered ErrorHandler.
      
      static ErrorHandler* set(ErrorHandler* pHandler);
            /// Registers the given handler as the current error handler.
            ///
            /// Returns the previously registered handler.

      static ErrorHandler* get();
            /// Returns a pointer to the currently registered
            /// ErrorHandler.

protected:  
      static ErrorHandler* defaultHandler();
            /// Returns the default ErrorHandler.     
            
private:
00125       static ErrorHandler* _pHandler;
      static FastMutex     _mutex;
};


//
// inlines
//
00133 inline ErrorHandler* ErrorHandler::get()
{
      return _pHandler;
}


} // namespace Poco


#endif // Foundation_ErrorHandler_INCLUDED

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