Supplies common server operations for dynamic and static configuration of service. More...
#include <Service_Config.h>
Public Member Functions | |
ACE_Service_Config (bool ignore_static_svcs=true, size_t size=ACE_DEFAULT_SERVICE_REPOSITORY_SIZE, 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 ACE_Service_Config * | singleton (void) |
= Static interfaces | |
static void | current (ACE_Service_Gestalt *) |
A mutator to set the "current" (TSS) gestalt instance. | |
static ACE_Service_Gestalt * | current (void) |
static ACE_Service_Gestalt * | instance (void) |
static ACE_Service_Gestalt * | global (void) |
static int | open (const ACE_TCHAR program_name[], const ACE_TCHAR *logger_key=ACE_DEFAULT_LOGGER_KEY, bool ignore_static_svcs=true, bool ignore_default_svc_conf_file=false, bool ignore_debug_flag=false) |
static int | open (int argc, ACE_TCHAR *argv[], const ACE_TCHAR *logger_key=ACE_DEFAULT_LOGGER_KEY, bool ignore_static_svcs=true, bool ignore_default_svc_conf_file=false, bool ignore_debug_flag=false) |
static int | close (void) |
static int | fini_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_Service_Gestalt * | static_svcs (void) |
static int | insert (ACE_Static_Svc_Descriptor *svc) |
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 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, bool force_replace=false) |
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 * | create_service_type (const ACE_TCHAR *n, ACE_Service_Type_Impl *o, ACE_DLL &dll, int active) |
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) |
static int | process_commandline_directives (void) |
static int | start_daemon (void) |
Become a daemon. | |
static int | load_static_svcs (void) |
Public Attributes | |
ACE_ALLOC_HOOK_DECLARE | |
Declare the dynamic allocation hooks. | |
Private Member Functions | |
virtual int | open_i (const ACE_TCHAR program_name[], const ACE_TCHAR *logger_key, bool ignore_static_svcs, bool ignore_default_svc_conf_file, bool ignore_debug_flag) |
virtual int | parse_args_i (int argc, ACE_TCHAR *argv[]) |
Private Attributes | |
ACE_Intrusive_Auto_Ptr < ACE_Service_Gestalt > | instance_ |
ACE_Threading_Helper < ACE_SYNCH_MUTEX > | threadkey_ |
bool | is_opened_ |
Have we called ACE_Service_Config::open() yet? | |
Static Private Attributes | |
static sig_atomic_t | reconfig_occurred_ = 0 |
True if reconfiguration occurred. | |
static bool | be_a_daemon_ = false |
Shall we become a daemon process? | |
static ACE_TCHAR * | pid_file_name_ = 0 |
Pathname of file to write process id. | |
static int | signum_ = SIGHUP |
Number of the signal used to trigger reconfiguration. | |
static ACE_Sig_Adapter * | signal_handler_ = 0 |
Handles the reconfiguration signals. | |
Friends | |
class | ACE_Service_Config_Guard |
class | ACE_Threading_Helper< ACE_Thread_Mutex > |
The helper needs intimate access (when building with no threads) | |
class | ACE_Threading_Helper< ACE_Null_Mutex > |
Supplies common server operations for dynamic and static configuration of service.
The ACE_Service_Config uses the Monostate pattern. Therefore, you can only have one of these instantiated per-process. It represents the process-wide collection of services, which is typicaly shared among all other configurable entities. The only ACE_Service_Config instance is registered with and owned by the ACE_Object_Manager.
By contrast, the ACE_Service_Gestalt represents the collection of services, pertaining to a configurable entity. Typicaly, a "configurable entity" is an instance, which owns an instance of ACE_Service_Gestalt in order to ensure full controll over the services it needs.
Another facet of ACE_Service_Config is that for a given thread, it provides access to its current, process-global ACE_Service_Gestalt instance through its curent() method.
ACE_Service_Config::ACE_Service_Config | ( | bool | ignore_static_svcs = true , |
size_t | size = ACE_DEFAULT_SERVICE_REPOSITORY_SIZE , |
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int | signum = SIGHUP |
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) |
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 |
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) |
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.
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.
ACE_Service_Type * ACE_Service_Config::create_service_type | ( | const ACE_TCHAR * | n, |
ACE_Service_Type_Impl * | o, | ||
ACE_DLL & | dll, | ||
int | active | ||
) | [static] |
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] |
void ACE_Service_Config::current | ( | ACE_Service_Gestalt * | newcurrent ) | [static] |
A mutator to set the "current" (TSS) gestalt instance.
Mutator for the currently active configuration context instance (gestalt). Intended for use by helper classes like
ACE_Service_Gestalt * ACE_Service_Config::current | ( | void | ) | [static] |
Accessor for the "current" service gestalt
Return the "global" configuration instance, for the current thread. This may be the same as instance(), but on some occasions, it may be a different one. For example, ACE_Service_Config_Guard provides a way of temporarily replacing the "current" configuration instance in the context of a thread.
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>.
ACE_Service_Gestalt * ACE_Service_Config::global | ( | void | ) | [static] |
Returns a process-wide global singleton instance in contrast with current (), which may return a different instance at different times, dependent on the context. Modifying this method's return value is strongly discouraged as it will circumvent the mechanism for dynamically loading services. If you must, use with extreme caution!
Return the global configuration instance. Allways returns the same instance
void ACE_Service_Config::handle_signal | ( | int | sig, |
siginfo_t * | , | ||
ucontext_t * | |||
) | [static] |
Handles signals to trigger reconfigurations.
int ACE_Service_Config::initialize | ( | const ACE_Service_Type * | sr, |
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::initialize | ( | const ACE_TCHAR * | svc_name, |
const ACE_TCHAR * | parameters | ||
) | [static] |
Initialize and activate a statically svc_name service.
Initialize and activate a statically linked service.
int ACE_Service_Config::insert | ( | ACE_Static_Svc_Descriptor * | svc ) | [static] |
Insert a static service descriptor for processing on open_i(). The corresponding ACE_STATIC_SVC_* macros were chaged to use this method instead of obtaining a ptr to a container. See the note on static_svcs(). Added to prevent exposing the internal storage representation of the services repository and provide a better way of debugging service loading and registration problems.
ACE_Service_Gestalt * ACE_Service_Config::instance | ( | void | ) | [static] |
This is what the static service initializators are hard-wired to use, so in order to avoid interface changes this method merely forwards to ACE_Service_Config::current
. This enables us to enforce which Service Gestalt is used for services registering through static initializers. Especially important for DLL-based dynamic services, which can contain their own static services and static initializers.
Return the configuration instance, considered "global" in the current thread. This may be the same as instance(), but on some occasions, it may be a different one. For example, ACE_Service_Config_Guard provides a way of temporarily replacing the "current" configuration instance in the context of a thread.
static int ACE_Service_Config::load_static_svcs | ( | void | ) | [static] |
int ACE_Service_Config::open | ( | int | argc, |
ACE_TCHAR * | argv[], | ||
const ACE_TCHAR * | logger_key = ACE_DEFAULT_LOGGER_KEY , |
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bool | ignore_static_svcs = true , |
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bool | ignore_default_svc_conf_file = false , |
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bool | ignore_debug_flag = false |
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) | [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:
chroot()
to the appropriate directory. Note: Options '-f' and '-S' complement each other. Directives from files and from '-S' option are processed together in the following order. First, all files are processed in the order they are specified in argv parameter. Second, all directive strings are executed in the order the directives appear in argv parameter.
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 true 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 true then the application is responsible for setting the ACE_Log_Msg::priority_mask appropriately. |
-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). |
int ACE_Service_Config::open | ( | const ACE_TCHAR | program_name[], |
const ACE_TCHAR * | logger_key = ACE_DEFAULT_LOGGER_KEY , |
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bool | ignore_static_svcs = true , |
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bool | ignore_default_svc_conf_file = false , |
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bool | ignore_debug_flag = false |
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) | [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 true 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, | ||
bool | ignore_static_svcs, | ||
bool | ignore_default_svc_conf_file, | ||
bool | ignore_debug_flag | ||
) | [private, virtual] |
Performs an open without parsing command-line arguments. Implements whats different in the opening sequence for this class, as opposed to the base class.
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 | argc, |
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
int ACE_Service_Config::parse_args_i | ( | int | argc, |
ACE_TCHAR * | argv[] | ||
) | [private, virtual] |
Implements whats different in the command line parameter processing for this class, as opposed to the base class.
static int ACE_Service_Config::process_commandline_directives | ( | void | ) | [static] |
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_directive | ( | const ACE_Static_Svc_Descriptor & | ssd, |
bool | force_replace = false |
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) | [static] |
Process one static service definition. Load a new static service into the ACE_Service_Repository.
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. |
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.
Process service configuration requests as indicated in the queue of svc.conf files.
int ACE_Service_Config::process_file | ( | const ACE_TCHAR | file[] ) | [static] |
Process a file containing a list of service configuration directives.
int ACE_Service_Config::reconfig_occurred | ( | void | ) | [static] |
True if reconfiguration occurred.
void ACE_Service_Config::reconfig_occurred | ( | int | config_occurred ) | [static] |
Indicate that 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).
void ACE_Service_Config::signal_handler | ( | ACE_Sig_Adapter * | signal_handler ) | [static] |
Set the signal_handler;for internal use by ACE_Object_Manager only.
ACE_Service_Config * ACE_Service_Config::singleton | ( | void | ) | [static] |
= Static interfaces
Returns the process-wide global singleton instance. It would have been created and will be managed by the Object Manager.
Return the global configuration instance. Always returns the same instance
static int ACE_Service_Config::start_daemon | ( | void | ) | [static] |
Become a daemon.
ACE_Service_Gestalt * ACE_Service_Config::static_svcs | ( | void | ) | [static] |
Returns a pointer to the list of statically linked services.
ACE_Service_Config::static_svcs ()->insert (...);
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...
friend class ACE_Service_Config_Guard [friend] |
Pointer to the Singleton (ACE_Cleanup) Gestalt instance. There is thread-specific global instance pointer, which is used to temporarily change which Gestalt instance is used for static service registrations.
A specific use case is a thread, which loads a _dynamic_ service from a DLL. If the said DLL also contains additional _static_ services, those *must* be registered with the same configuration repository as the dynamic service. Otherwise, the DLL's static services would be registered with the global Gestalt and may outlive the DLL that contains their code and perhaps the memory in which they are in. This is a problem because if the DLL gets unloaded (as it will, if it was loaded in an instance of Gestalt), the DLL's memory will be deallocated, but the global service repository will still "think" it must finalize the (DLL's) static services - with disastrous consequences, occurring in the post-main code (at_exit()). This class needs the intimate access to be able to swap the current TSS pointer for the global Gestalt.
friend class ACE_Threading_Helper< ACE_Null_Mutex > [friend] |
friend class ACE_Threading_Helper< ACE_Thread_Mutex > [friend] |
The helper needs intimate access (when building with no threads)
Declare the dynamic allocation hooks.
bool ACE_Service_Config::be_a_daemon_ = false [static, private] |
Shall we become a daemon process?
The Instance, or the global (default) configuration context. The monostate would forward the calls to that instance. The TSS will point here
bool ACE_Service_Config::is_opened_ [private] |
Have we called ACE_Service_Config::open() yet?
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.
ACE_Threading_Helper<ACE_SYNCH_MUTEX> ACE_Service_Config::threadkey_ [private] |
A helper instance to manage thread-specific key creation. Dependent on the syncronization mutex ACE uses, the corresponding partial template instantiation will perform the right services that have to do with managing thread-specific storage. Note that, for single-threaded builds they would do (next to) nothing.