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+// -*- C++ -*-
+
+//=============================================================================
+/**
+ * @file Resume_Handle.h
+ *
+ * $Id$
+ *
+ * @author Balachandran Natarajan <bala@cs.wustl.edu>
+ */
+//=============================================================================
+
+#ifndef TAO_RESUME_HANDLE_H
+#define TAO_RESUME_HANDLE_H
+
+#include /**/ "ace/pre.h"
+
+#include /**/ "tao/TAO_Export.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#include /**/ "tao/Versioned_Namespace.h"
+
+TAO_BEGIN_VERSIONED_NAMESPACE_DECL
+
+class TAO_ORB_Core;
+
+/**
+ * @class TAO_Resume_Handle
+ *
+ * @brief A utility class that helps in resuming handlers if TAO uses
+ * a TP Reactor from ACE.
+ *
+ * Please read the documentation in the bugzilla #575 in the bugzilla
+ * database what we mean by handler resumption.
+ *
+ * When TAO uses a TP reactor, it takes care of resuming the handler
+ * once it makes sure that it has read the whole message out of the
+ * socket. During the process of reading the transport object would
+ * have to deal with errors in 'read' from the socket, or errors in
+ * the messages that has been received. Instead of calling
+ * resume_handler () on the reactor at every point in the code, we
+ * use this utility class to take care of the resumption.
+ */
+
+class TAO_Export TAO_Resume_Handle
+{
+
+public:
+
+ /// Ctor.
+ TAO_Resume_Handle (TAO_ORB_Core *orb_core = 0,
+ ACE_HANDLE h = ACE_INVALID_HANDLE);
+ /// Dtor
+ ~TAO_Resume_Handle (void);
+
+ enum TAO_Handle_Resume_Flag
+ {
+ TAO_HANDLE_RESUMABLE = 0,
+ TAO_HANDLE_ALREADY_RESUMED,
+ TAO_HANDLE_LEAVE_SUSPENDED
+ };
+
+ /// Allow the users of this class to change the underlying flag.
+ void set_flag (TAO_Handle_Resume_Flag fl);
+
+ /// Assignment operator
+ TAO_Resume_Handle &operator= (const TAO_Resume_Handle &rhs);
+
+ /// Resume the handle in the reactor only if the ORB uses a TP
+ /// reactor. Else we don't resume the handle.
+ void resume_handle (void);
+
+ // Hook method called at the end of a connection handler's
+ // handle_input function. Might override the handle_input
+ // return value or change the resume_handler's flag_ value.
+ void handle_input_return_value_hook (int& return_value);
+
+
+private:
+
+ /// Our ORB Core.
+ TAO_ORB_Core *orb_core_;
+
+ /// The actual handle that needs resumption..
+ ACE_HANDLE handle_;
+
+ /// The flag for indicating whether the handle has been resumed or
+ /// not. A value of '0' indicates that the handle needs resumption.
+ TAO_Handle_Resume_Flag flag_;
+};
+
+TAO_END_VERSIONED_NAMESPACE_DECL
+
+#if defined (__ACE_INLINE__)
+# include "tao/Resume_Handle.inl"
+#endif /* __ACE_INLINE__ */
+
+#include /**/ "ace/post.h"
+
+#endif /*TAO_RESUME_HANDLE*/