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diff --git a/trunk/TAO/tao/LF_Invocation_Event.h b/trunk/TAO/tao/LF_Invocation_Event.h
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+++ b/trunk/TAO/tao/LF_Invocation_Event.h
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+// -*- C++ -*-
+
+//=============================================================================
+/**
+ *  @file LF_Invocation_Event.h
+ *
+ *  $Id$
+ *
+ *  @author Carlos O'Ryan <coryan@uci.edu>
+ */
+//=============================================================================
+
+#ifndef TAO_LF_INVOCATION_EVENT_H
+#define TAO_LF_INVOCATION_EVENT_H
+
+#include /**/ "ace/pre.h"
+
+#include "tao/LF_Event.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+TAO_BEGIN_VERSIONED_NAMESPACE_DECL
+
+/**
+ * @class TAO_LF_Invocation_Event
+ *
+ * @brief Use the Leader/Follower loop to wait for one specific event
+ * in the invocation path.
+ *
+ * Concrete event types and manipulation class through which the
+ * invocation data path would flow. Typically state changes of
+ * interest include whether a message has arrived, or timedout waiting
+ * for a message or if the cionnection is closed waiting for a
+ * message. Details of the states are documented within the class.
+ *
+ */
+class TAO_Export TAO_LF_Invocation_Event: public TAO_LF_Event
+{
+public:
+  /// Constructor
+  TAO_LF_Invocation_Event (void);
+
+  /// Destructor
+  virtual ~TAO_LF_Invocation_Event (void);
+
+  /// Return 1 if the condition was satisfied successfully, 0 if it
+  /// has not
+  int successful (void) const;
+
+  /// Return 1 if an error was detected while waiting for the
+  /// event
+  int error_detected (void) const;
+  //@}
+
+protected:
+
+  /// Validate and perform the state change
+  /*
+   * This concrete class uses the following states declared in the
+   * class TAO_LF_Event
+   *
+   * LFS_IDLE    - The event is created, and is in initial state.
+   * LFS_ACTIVE  - The event is active and it can transition to any of
+   *               the following states, all the states are final.
+   * LFS_SUCCESS - The event has completed successfully.
+   * LFS_FAILURE - A failure has been detected while the event was
+   *               active.
+   * LFS_TIMEOUT - The event has timed out.
+   * LFS_CONNECTION_CLOSED - The connection was closed when the state
+   *                         was active.
+   *
+   */
+  virtual void state_changed_i (int new_state);
+
+private:
+  /// Check whether we have reached the final state..
+  int is_state_final (void);
+};
+
+TAO_END_VERSIONED_NAMESPACE_DECL
+
+#include /**/ "ace/post.h"
+
+#endif  /* TAO_LF_INVOCATION_EVENT_H */