Query and Activation

Query and Activation — Querying for components and Activating them

Synopsis

#include <bonobo-activation/bonobo-activation.h>

typedef             Bonobo_ImplementationID;
typedef             Bonobo_ActivationID;
typedef             Bonobo_ActivationFlags;
enum                Bonobo_ActivationResultType;
Bonobo_ServerInfoList * bonobo_activation_query         (const char *requirements,
                                                         char *const *selection_order,
                                                         CORBA_Environment *ev);
CORBA_Object        bonobo_activation_activate          (const char *requirements,
                                                         char *const *selection_order,
                                                         Bonobo_ActivationFlags flags,
                                                         Bonobo_ActivationID *ret_aid,
                                                         CORBA_Environment *ev);
CORBA_Object        bonobo_activation_activate_from_id  (const Bonobo_ActivationID aid,
                                                         Bonobo_ActivationFlags flags,
                                                         Bonobo_ActivationID *ret_aid,
                                                         CORBA_Environment *ev);
void                (*BonoboActivationCallback)         (CORBA_Object activated_object,
                                                         const char *error_reason,
                                                         gpointer user_data);
void                bonobo_activation_activate_async    (const char *requirements,
                                                         char *const *selection_order,
                                                         Bonobo_ActivationFlags flags,
                                                         BonoboActivationCallback callback,
                                                         gpointer user_data,
                                                         CORBA_Environment *ev);
void                bonobo_activation_activate_from_id_async
                                                        (const Bonobo_ActivationID aid,
                                                         Bonobo_ActivationFlags flags,
                                                         BonoboActivationCallback callback,
                                                         gpointer user_data,
                                                         CORBA_Environment *ev);
void                bonobo_activation_set_activation_env_value
                                                        (const char *name,
                                                         const char *value);

Description

This section describes how you can query for components and activate them.

Two set of functions are described: synchronous and asynchronous ones. The asynchronous version of the functions allow you to avoid blocking your application while the CORBA servers are started.

Details

Bonobo_ImplementationID

typedef CORBA_string Bonobo_ImplementationID;

Bonobo_ActivationID

typedef CORBA_string Bonobo_ActivationID;

Bonobo_ActivationFlags

typedef CORBA_long Bonobo_ActivationFlags;

enum Bonobo_ActivationResultType

typedef enum {
  Bonobo_ACTIVATION_RESULT_OBJECT,
  Bonobo_ACTIVATION_RESULT_SHLIB,
  Bonobo_ACTIVATION_RESULT_NONE
} Bonobo_ActivationResultType;

bonobo_activation_query ()

Bonobo_ServerInfoList * bonobo_activation_query         (const char *requirements,
                                                         char *const *selection_order,
                                                         CORBA_Environment *ev);

Executes the requirements query on the bonobo-activation-server. The result is sorted according to selection_order. selection_order can safely be NULL as well as ev. The returned list has to be freed with CORBA_free.

`requirements` :	query string.
`selection_order` :	sort criterion for returned list.
`ev` :	a `CORBA_Environment` structure which will contain the CORBA exception status of the operation, or NULL
Returns :	the list of servers matching the requirements.

bonobo_activation_activate ()

CORBA_Object        bonobo_activation_activate          (const char *requirements,
                                                         char *const *selection_order,
                                                         Bonobo_ActivationFlags flags,
                                                         Bonobo_ActivationID *ret_aid,
                                                         CORBA_Environment *ev);

Activates a given object. ret_aid can be safely NULLed as well as ev and selection_order. flags can be set to zero if you do not what to use.

`requirements` :	query string.
`selection_order` :	sort criterion for returned list.
`flags` :	how to activate the object.
`ret_aid` :	AID of the activated object.
`ev` :	`CORBA_Environment` structure which will contain the CORBA exception status of the operation.
Returns :	the CORBA object reference of the activated object. This value can be CORBA_OBJECT_NIL: you are supposed to check `ev` for success.

bonobo_activation_activate_from_id ()

CORBA_Object        bonobo_activation_activate_from_id  (const Bonobo_ActivationID aid,
                                                         Bonobo_ActivationFlags flags,
                                                         Bonobo_ActivationID *ret_aid,
                                                         CORBA_Environment *ev);

Activates the server corresponding to aid. ret_aid can be safely NULLed as well as ev. flags can be zero if you do not know what to do.

`aid` :	AID or IID of the object to activate.
`flags` :	activation flag.
`ret_aid` :	AID of the activated server.
`ev` :	`CORBA_Environment` structure which will contain the CORBA exception status of the operation.
Returns :	a CORBA object reference to the newly activated server. Do not forget to check `ev` for failure!!

BonoboActivationCallback ()

void                (*BonoboActivationCallback)         (CORBA_Object activated_object,
                                                         const char *error_reason,
                                                         gpointer user_data);

This is the signature of the function which you must pass as a callback to the asynchrounous activation functions.

`activated_object` :
`error_reason` :
`user_data` :

bonobo_activation_activate_async ()

void                bonobo_activation_activate_async    (const char *requirements,
                                                         char *const *selection_order,
                                                         Bonobo_ActivationFlags flags,
                                                         BonoboActivationCallback callback,
                                                         gpointer user_data,
                                                         CORBA_Environment *ev);

This function will asynchronously try to activate a component given the requirements query string. When the component is activated or when the activation fails, it will call callback with the given user_data data as parameter. callback will be called with a CORBA_OBJECT_NIL object if the activation fails. If the activation fails, the callback will be given a human-readable string containing a description of the error. In case of sucess, the error string value is undefined.

selection_order can be safely NULLed as well as ev and user_data. flags can be set to 0 if you do not know what to use.

`requirements` :	the bonobo-activation query string.
`selection_order` :	preference array.
`flags` :	activation flags.
`callback` :	callback function.
`user_data` :	data to be poassed to the callback function.
`ev` :	exception structure.

bonobo_activation_activate_from_id_async ()

void                bonobo_activation_activate_from_id_async
                                                        (const Bonobo_ActivationID aid,
                                                         Bonobo_ActivationFlags flags,
                                                         BonoboActivationCallback callback,
                                                         gpointer user_data,
                                                         CORBA_Environment *ev);

This function will asynchronously try to activate a component with the given aid. When the component is activated or when the activation fails, it will call callback with the given user_data data as parameter. callback will be called with a CORBA_OBJECT_NIL object if the activation fails. If the activation fails, the callback will be given a human-readable string containing a description of the error. In case of sucess, the error string value is undefined.

flags can be 0 if you do not know what to set it to and ev can be safely set to NULL.

`aid` :	the AID or IID of the component to activate.
`flags` :	activation flags.
`callback` :	callback function.
`user_data` :	data to be poassed to the callback function.
`ev` :	exception structure.

bonobo_activation_set_activation_env_value ()

void                bonobo_activation_set_activation_env_value
                                                        (const char *name,
                                                         const char *value);

`name` :
`value` :

			Bonobo Activation API Reference Manual
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