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// -*- C++ -*-
//=============================================================================
/**
* @file Svc_Conf_Param.h
*
* @author Iliyan Jeliazkov <iliyan@ociweb.com>
* @author Based on code originally found in Svc_Conf.h by Doug
Schmidt and Ossama Othman.
*/
//=============================================================================
#ifndef ACE_SVC_CONF_PARAM_H
#define ACE_SVC_CONF_PARAM_H
#include /**/ "ace/pre.h"
// Globally visible macros, type decls, and extern var decls for
// Service Configurator utility.
#include "ace/Obstack.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
// Forward declarations.
struct ace_yy_buffer_state;
class ACE_Service_Gestalt;
extern void ace_yy_delete_buffer (ace_yy_buffer_state *buffer);
/**
* @class ACE_Svc_Conf_Param
*
* @brief An instance of this object will be passed down to the
* yyparse() and yylex() functions.
*
* This is intended for internal use within ACE service configuration
* framework only.
*
* This class retains the state for a given parse/scan. It primarily
* makes it possible to hold the static object lock in the scanner
* for as short a period of time as possible. The resulting finer
* grained locking prevents deadlocks from occurring when scanning a
* `svc.conf' file and activating an ACE_Task, for example, as a
* result of processing the directives in that file.
*/
class ACE_Svc_Conf_Param
{
public:
enum SVC_CONF_PARAM_TYPE
{
/// The lexer will scan a file containing one or more directives.
SVC_CONF_FILE,
/// The lexer will scan a string containing a directive.
SVC_CONF_DIRECTIVE
};
/// Constructor
ACE_Svc_Conf_Param (ACE_Service_Gestalt* config, FILE *file)
: type (SVC_CONF_FILE),
yyerrno (0),
yylineno (1),
buffer (0),
obstack (),
config (config)
{
source.file = file;
}
/// Constructor
ACE_Svc_Conf_Param (ACE_Service_Gestalt* config, const ACE_TCHAR *directive)
: type (SVC_CONF_DIRECTIVE),
yyerrno (0),
yylineno (1),
buffer (0),
obstack (),
config (config)
{
source.directive = directive;
}
~ACE_Svc_Conf_Param (void)
{
ace_yy_delete_buffer (this->buffer);
}
public:
union
{
/// FILE stream from which directives will be scanned and parsed.
FILE *file;
/// String containing directive that will be scanned and parsed.
const ACE_TCHAR *directive;
} source;
/// Discriminant use to determine which union member to use.
SVC_CONF_PARAM_TYPE type;
/// Keeps track of the number of errors encountered so far.
int yyerrno;
/// Keeps track of the current line number for error-handling routine.
int yylineno;
/// Lexer buffer that corresponds to the current Service
/// Configurator file/direct scan.
ace_yy_buffer_state *buffer;
/// Obstack used for efficient memory allocation when
/// parsing/scanning a service configurator directive.
ACE_Obstack_T<ACE_TCHAR> obstack;
/// A reference to the configuration
ACE_Service_Gestalt *config;
};
// Parameter that is passed down to the yyparse() function, and
// eventually to yylex().
#define YYPARSE_PARAM ace_svc_conf_parameter
#define YYLEX_PARAM YYPARSE_PARAM
#define ACE_SVC_CONF_PARAM (static_cast<ACE_Svc_Conf_Param *> (YYLEX_PARAM))
ACE_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#endif /* ACE_SVC_CONF_PARAM_H */
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