ACE_Service_Config Class Reference

Supplies common server operations for dynamic and static configuration of services. More...

#include <Service_Config.h>

Collaboration diagram for ACE_Service_Config:


Public Types
enum	{ MAX_SERVICES = ACE_DEFAULT_SERVICE_REPOSITORY_SIZE }
Public Member Functions
	ACE_Service_Config (int ignore_static_svcs=1, size_t size=ACE_Service_Config::MAX_SERVICES, int signum=SIGHUP)
	ACE_Service_Config (const ACE_TCHAR program_name[], const ACE_TCHAR *logger_key=ACE_DEFAULT_LOGGER_KEY)
virtual	~ACE_Service_Config (void)
void	dump (void) const
	Dump the state of an object.
Static Public Member Functions
static int	open_i (const ACE_TCHAR program_name[], const ACE_TCHAR *logger_key=ACE_DEFAULT_LOGGER_KEY, int ignore_default_svc_conf_file=0, int ignore_debug_flag=0)
static int	open (const ACE_TCHAR program_name[], const ACE_TCHAR *logger_key=ACE_DEFAULT_LOGGER_KEY, int ignore_static_svcs=1, int ignore_default_svc_conf_file=0, int ignore_debug_flag=0)
static int	open (int argc, ACE_TCHAR argv[], const ACE_TCHAR logger_key=ACE_DEFAULT_LOGGER_KEY, int ignore_static_svcs=1, int ignore_default_svc_conf_file=0, int ignore_debug_flag=0)
static int	close (void)
static int	fini_svcs (void)
static int	close_svcs (void)
static int	reconfig_occurred (void)
	True if reconfiguration occurred.
static void	reconfig_occurred (int)
	Indicate that reconfiguration occurred.
static void	reconfigure (void)
	Perform the reconfiguration process.
static ACE_STATIC_SVCS *	static_svcs (void)
	Returns a pointer to the list of statically linked services.
static int	initialize (const ACE_Service_Type , const ACE_TCHAR parameters)
static int	initialize (const ACE_TCHAR svc_name, const ACE_TCHAR parameters)
	Initialize and activate a statically svc_name service.
static int	resume (const ACE_TCHAR svc_name[])
static int	suspend (const ACE_TCHAR svc_name[])
static int	remove (const ACE_TCHAR svc_name[])
static ACE_INLINE void	signal_handler (ACE_Sig_Adapter *)
	Set the signal_handler;for internal use by ACE_Object_Manager only.
static int	process_file (const ACE_TCHAR file[])
static int	process_directive (const ACE_TCHAR directive[])
static int	process_directive (const ACE_Static_Svc_Descriptor &ssd, int force_replace=0)
	Process one static service definition.
static int	process_directives (void)
static void	handle_signal (int sig, siginfo_t , ucontext_t )
	Handles signals to trigger reconfigurations.
static int	parse_args (int, ACE_TCHAR *argv[])
static ACE_Service_Type_Impl *	create_service_type_impl (const ACE_TCHAR name, int type, void symbol, u_int flags, ACE_Service_Object_Exterminator gobbler)
Public Attributes
	ACE_ALLOC_HOOK_DECLARE
	Declare the dynamic allocation hooks.
Static Protected Member Functions
static int	process_commandline_directives (void)
static int	process_directives_i (ACE_Svc_Conf_Param *param)
static int	start_daemon (void)
	Become a daemon.
static int	load_static_svcs (void)
Static Private Member Functions
static int	init_svc_conf_file_queue (void)
	Initialize the <svc_conf_file_queue_> if necessary.
Static Private Attributes
static const ACE_TCHAR *	logger_key_ = ACE_DEFAULT_LOGGER_KEY
static ACE_STATIC_SVCS *	static_svcs_ = 0
	Singleton repository of statically linked services.
static ACE_SVC_QUEUE *	svc_queue_ = 0
	Queue of services specified on the command-line.
static ACE_SVC_QUEUE *	svc_conf_file_queue_ = 0
static sig_atomic_t	reconfig_occurred_ = 0
	True if reconfiguration occurred.
static int	be_a_daemon_ = 0
	Shall we become a daemon process?
static ACE_TCHAR *	pid_file_name_ = 0
	Pathname of file to write process id.
static int	no_static_svcs_ = 1
	Should we avoid loading the static services?
static int	signum_ = SIGHUP
	Number of the signal used to trigger reconfiguration.
static ACE_Sig_Adapter *	signal_handler_ = 0
	Handles the reconfiguration signals.
static int	is_initialized_ = 0

Detailed Description

Supplies common server operations for dynamic and static configuration of services.

The ACE_Service_Config uses the Monostate pattern. Therefore, you can only have one of these instantiated per-process.

Note:: The signal_handler_ static member is allocated by the ACE_Object_Manager. The ACE_Service_Config constructor uses signal_handler_. Therefore, if the program has any static ACE_Service_Config objects, there might be initialization order problems. They can be minimized, but not eliminated, by _not_ defining ACE_HAS_NONSTATIC_OBJECT_MANAGER.

Member Enumeration Documentation

anonymous enum

Enumerator:

MAX_SERVICES

Constructor & Destructor Documentation

ACE_Service_Config::ACE_Service_Config	(	int	ignore_static_svcs = `1`,
		size_t	size = `ACE_Service_Config::MAX_SERVICES`,
		int	signum = `SIGHUP`
	)

Initialize the Service Repository. Note that initialising signum to a negative number will prevent a signal handler being registered when the repository is opened.

ACE_Service_Config::ACE_Service_Config	(	const ACE_TCHAR	program_name[],
		const ACE_TCHAR *	logger_key = `ACE_DEFAULT_LOGGER_KEY`
	)

Performs an open without parsing command-line arguments. The logger_key indicates where to write the logging output, which is typically either a STREAM pipe or a socket address.

ACE_Service_Config::~ACE_Service_Config ( void ) [virtual]

Perform user-specified close activities and remove dynamic memory.

Member Function Documentation

int ACE_Service_Config::close ( void ) [static]

Tidy up and perform last rites when ACE_Service_Config is shut down. This method calls <close_svcs>. Returns 0.

int ACE_Service_Config::close_svcs ( void ) [static]

Perform user-specified close hooks on all of the configured services in the Service_Repository, then delete the Service_Repository itself. Returns 0.

ACE_Service_Type_Impl * ACE_Service_Config::create_service_type_impl	(	const ACE_TCHAR *	name,
		int	type,
		void *	symbol,
		u_int	flags,
		ACE_Service_Object_Exterminator	gobbler
	)			`[static]`

ACE_BEGIN_VERSIONED_NAMESPACE_DECL void ACE_Service_Config::dump ( void ) const

Dump the state of an object.

int ACE_Service_Config::fini_svcs ( void ) [static]

Perform user-specified close hooks and possibly delete all of the configured services in the <Service_Repository>.

void ACE_Service_Config::handle_signal	(	int	sig,
		siginfo_t *	,
		ucontext_t *
	)			`[static]`

Handles signals to trigger reconfigurations.

int ACE_Service_Config::init_svc_conf_file_queue ( void ) [static, private]

Initialize the <svc_conf_file_queue_> if necessary.

int ACE_Service_Config::initialize	(	const ACE_TCHAR *	svc_name,
		const ACE_TCHAR *	parameters
	)			`[static]`

Initialize and activate a statically svc_name service.

int ACE_Service_Config::initialize	(	const ACE_Service_Type *	,
		const ACE_TCHAR *	parameters
	)			`[static]`

Dynamically link the shared object file and retrieve a pointer to the designated shared object in this file.

int ACE_Service_Config::load_static_svcs ( void ) [static, protected]

Add the default statically-linked services to the ACE_Service_Repository.

ACE_INLINE int ACE_Service_Config::open	(	int	argc,
		ACE_TCHAR *	argv[],
		const ACE_TCHAR *	logger_key = `ACE_DEFAULT_LOGGER_KEY`,
		int	ignore_static_svcs = `1`,
		int	ignore_default_svc_conf_file = `0`,
		int	ignore_debug_flag = `0`
	)			`[static]`

This is the primary entry point into the ACE_Service_Config (the constructor just handles simple initializations). It parses arguments passed in from argc and argv parameters. The arguments that are valid in a call to this method include:

'-b' Option to indicate that we should be a daemon. Note that when this option is used, the process will be daemonized before the service configuration file(s) are read. During daemonization, (on POSIX systems) the current directory will be changed to "/" so the caller should either fully specify the file names, or execute a chroot() to the appropriate directory.
See also:
ACE::daemonize().
'-d' Turn on debugging mode
'-f' Specifies a configuration file name other than the default svc.conf. Can be specified multiple times to use multiple files.
'-k' Specifies the rendezvous point to use for the ACE distributed logger.
'-y' Explicitly enables the use of static services. This flag overrides the ignore_static_svcs parameter value.
'-n' Explicitly disables the use of static services. This flag overrides the ignore_static_svcs parameter value.
'-p' Specifies a pathname which is used to store the process id.
'-s' Specifies a signal number other than SIGHUP to trigger reprocessing of the configuration file(s). Ignored for platforms that do not have POSIX signals, such as Windows.
'-S' Specifies a service directive string. Enclose the string in quotes and escape any embedded quotes with a backslash. This option specifies service directives without the need for a configuration file.

Parameters:

	argc	The number of commandline arguments.
	argv	The array with commandline arguments
	logger_key	Indicates where to write the logging output, which is typically either a STREAM pipe or a socket address.
	ignore_static_svcs	If 1 then static services are not loaded, otherwise, they are loaded.
	ignore_default_svc_conf_file	If non-0 then the `svc.conf` configuration file will be ignored.
	ignore_debug_flag	If non-0 then the application is responsible for setting the `ACE_Log_Msg::priority_mask` appropriately.

Return values:

	-1	The configuration file is not found or cannot be opened (errno is set accordingly).
	0	Success.
	>0	The number of errors encountered while processing the service configuration file(s).

ACE_BEGIN_VERSIONED_NAMESPACE_DECL ACE_INLINE int ACE_Service_Config::open	(	const ACE_TCHAR	program_name[],
		const ACE_TCHAR *	logger_key = `ACE_DEFAULT_LOGGER_KEY`,
		int	ignore_static_svcs = `1`,
		int	ignore_default_svc_conf_file = `0`,
		int	ignore_debug_flag = `0`
	)			`[static]`

Performs an open without parsing command-line arguments. The logger_key indicates where to write the logging output, which is typically either a STREAM pipe or a socket address. If ignore_static_svcs is 1 then static services are not loaded, otherwise, they are loaded. If ignore_default_svc_conf_file is non-0 then the <svc.conf> configuration file will be ignored. Returns zero upon success, -1 if the file is not found or cannot be opened (errno is set accordingly), otherwise returns the number of errors encountered loading the services in the specified svc.conf configuration file. If ignore_debug_flag is non-0 then the application is responsible for setting the ACE_Log_Msg::priority_mask appropriately.

int ACE_Service_Config::open_i	(	const ACE_TCHAR	program_name[],
		const ACE_TCHAR *	logger_key = `ACE_DEFAULT_LOGGER_KEY`,
		int	ignore_default_svc_conf_file = `0`,
		int	ignore_debug_flag = `0`
	)			`[static]`

Performs an open without parsing command-line arguments. The logger_key indicates where to write the logging output, which is typically either a STREAM pipe or a socket address. If ignore_default_svc_conf_file is non-0 then the "svc.conf" file will be ignored. If ignore_debug_flag is non-0 then the application is responsible for setting the ACE_Log_Msg::priority_mask() appropriately. Returns number of errors that occurred on failure and 0 otherwise.

int ACE_Service_Config::parse_args	(	int	,
		ACE_TCHAR *	argv[]
	)			`[static]`

Handle the command-line options intended for the ACE_Service_Config. Note that argv[0] is assumed to be the program name. The arguments that are valid in a call to this method are

'-b' Option to indicate that we should be a daemon
'-d' Turn on debugging mode
'-f' Option to read in the list of svc.conf file names
'-k' Option to read a wide string where in the logger output can be written
'-y' Turn on the flag for a repository of statically linked services
'-n' Need not have a repository of statically linked services
'-S' Option to read in the list of services on the command-line Please observe the difference between options '-f' that looks for a list of files and here a list of services.

int ACE_Service_Config::process_commandline_directives ( void ) [static, protected]

Process service configuration requests that were provided on the command-line. Returns the number of errors that occurred.

int ACE_Service_Config::process_directive	(	const ACE_Static_Svc_Descriptor &	ssd,
		int	force_replace = `0`
	)			`[static]`

Process one static service definition.

Load a new static service into the ACE_Service_Repository.

Parameters:

	ssd	Service descriptor, see the document of ACE_Static_Svc_Descriptor for more details.
	force_replace	If set the new service descriptor replaces any previous instance in the ACE_Service_Repository.

Returns:: Returns -1 if the service cannot be 'loaded'.

int ACE_Service_Config::process_directive ( const ACE_TCHAR directive[] ) [static]

Process one service configuration directive, which is passed as a string. Returns the number of errors that occurred.

int ACE_Service_Config::process_directives ( void ) [static]

Process (or re-process) service configuration requests that are provided in the svc.conf file(s). Returns the number of errors that occurred.

int ACE_Service_Config::process_directives_i ( ACE_Svc_Conf_Param * param ) [static, protected]

This is the implementation function that process_directives() and process_directive() both call. Returns the number of errors that occurred.

int ACE_Service_Config::process_file ( const ACE_TCHAR file[] ) [static]

Process a file containing a list of service configuration directives.

void ACE_Service_Config::reconfig_occurred ( int ) [static]

Indicate that reconfiguration occurred.

int ACE_Service_Config::reconfig_occurred ( void ) [static]

True if reconfiguration occurred.

void ACE_Service_Config::reconfigure ( void ) [static]

Perform the reconfiguration process.

int ACE_Service_Config::remove ( const ACE_TCHAR svc_name[] ) [static]

Totally remove svc_name from the daemon by removing it from the ACE_Reactor, and unlinking it if necessary.

int ACE_Service_Config::resume ( const ACE_TCHAR svc_name[] ) [static]

Resume a svc_name that was previously suspended or has not yet been resumed (e.g., a static service).

ACE_INLINE void ACE_Service_Config::signal_handler ( ACE_Sig_Adapter * ) [static]

Set the signal_handler;for internal use by ACE_Object_Manager only.

int ACE_Service_Config::start_daemon ( void ) [static, protected]

Become a daemon.

ACE_STATIC_SVCS * ACE_Service_Config::static_svcs ( void ) [static]

Returns a pointer to the list of statically linked services.

int ACE_Service_Config::suspend ( const ACE_TCHAR svc_name[] ) [static]

Suspend svc_name. Note that this will not unlink the service from the daemon if it was dynamically linked, it will mark it as being suspended in the Service Repository and call the <suspend> member function on the appropriate ACE_Service_Object. A service can be resumed later on by calling the <RESUME> member function...

Member Data Documentation

ACE_Service_Config::ACE_ALLOC_HOOK_DECLARE

Declare the dynamic allocation hooks.

int ACE_Service_Config::be_a_daemon_ = 0 [static, private]

Shall we become a daemon process?

int ACE_Service_Config::is_initialized_ = 0 [static, private]

Keep track of whether the ACE_Service_Config is already initialized. If so, we can't allow <yyparse> to be called since it's not reentrant. This variable is incremented by the <ACE_Service_Config::open> method and decremented by the <ACE_Service_Config::close> method.

const ACE_TCHAR * ACE_Service_Config::logger_key_ = ACE_DEFAULT_LOGGER_KEY [static, private]

Indicates where to write the logging output. This is typically either a STREAM pipe or a socket address.

int ACE_Service_Config::no_static_svcs_ = 1 [static, private]

Should we avoid loading the static services?

ACE_TCHAR * ACE_Service_Config::pid_file_name_ = 0 [static, private]

Pathname of file to write process id.

sig_atomic_t ACE_Service_Config::reconfig_occurred_ = 0 [static, private]

True if reconfiguration occurred.

ACE_Sig_Adapter * ACE_Service_Config::signal_handler_ = 0 [static, private]

Handles the reconfiguration signals.

int ACE_Service_Config::signum_ = SIGHUP [static, private]

Number of the signal used to trigger reconfiguration.