prelude-connection-pool

prelude-connection-pool

Functions

Types and Values

Description

Functions

prelude_connection_pool_broadcast ()

void
prelude_connection_pool_broadcast (prelude_connection_pool_t *pool,
                                   prelude_msg_t *msg);

Sends the message contained in msg to all the connection in pool .

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

msg

Pointer on a prelude_msg_t object.

 

prelude_connection_pool_broadcast_async ()

void
prelude_connection_pool_broadcast_async
                               (prelude_connection_pool_t *pool,
                                prelude_msg_t *msg);

Sends the message contained in msg to all connections in pool asynchronously. After the request is processed, the msg message will be freed.

Parameters

pool

Pointer to a prelude_connection_pool_t object

 

msg

Pointer on a prelude_msg_t object.

 

prelude_connection_pool_init ()

int
prelude_connection_pool_init (prelude_connection_pool_t *pool);

Initializes pool . This means that connection associated with pool using prelude_connection_pool_set_connection_string() will be established.

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

Returns

0 on success, a negative value on error.


prelude_connection_pool_new ()

int
prelude_connection_pool_new (prelude_connection_pool_t **ret,
                             prelude_client_profile_t *cp,
                             prelude_connection_permission_t permission);

prelude_connection_pool_new() initializes a new Connection Manager object.

Parameters

ret

Pointer to an address where to store the created prelude_connection_pool_t object.

 

cp

The prelude_client_profile_t to use for connection.

 

permission

Permission the connection in this connection-pool will require.

 

Returns

0 on success or a negative value if an error occured.


prelude_connection_pool_ref ()

prelude_connection_pool_t *
prelude_connection_pool_ref (prelude_connection_pool_t *pool);

Increases pool reference count.

prelude_connection_pool_destroy() will decrease the refcount until it reaches 0, at which point the pool will be destroyed.

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

Returns

The provided pool is returned.


prelude_connection_pool_get_connection_list ()

prelude_list_t *
prelude_connection_pool_get_connection_list
                               (prelude_connection_pool_t *pool);

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

Returns

The list of connections handled by pool .


prelude_connection_pool_add_connection ()

int
prelude_connection_pool_add_connection
                               (prelude_connection_pool_t *pool,
                                prelude_connection_t *cnx);

Adds cnx to pool set of connections.

If pool is already initialized (prelude_connection_pool_init() called) and cnx is not alive, it will attempt a reconnection.

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

cnx

Pointer to a prelude_connection_t object to add to pool .

 

Returns

0 on success, a negative value if an error occured.


prelude_connection_pool_del_connection ()

int
prelude_connection_pool_del_connection
                               (prelude_connection_pool_t *pool,
                                prelude_connection_t *cnx);

Remove cnx from pool of connections.

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

cnx

Pointer to a prelude_connection_t object to remove from pool .

 

Returns

0 on success, a negative value if an error occured.


prelude_connection_pool_set_connection_dead ()

int
prelude_connection_pool_set_connection_dead
                               (prelude_connection_pool_t *pool,
                                prelude_connection_t *cnx);

Notifies pool that the connection identified by cnx is dead.

Usually, this function should not be used since pool is self sufficient, and handles connections issues internally. However, it is sometime useful when the user has several mechanisms using the connection, and that its own mechanism detects a connection problem before pool notice.

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

cnx

Pointer to a prelude_connection_t object used within pool .

 

Returns

0 on success, a negative value if an error occured.


prelude_connection_pool_set_connection_alive ()

int
prelude_connection_pool_set_connection_alive
                               (prelude_connection_pool_t *pool,
                                prelude_connection_t *cnx);

Notifies pool that the connection identified by cnx went back alive.

Usually, this function should not be used since pool is self sufficient, and handles connection issues internally. However, it is sometime useful when the user has several mechanisms using the connection, and that its own mechanism detects a connection problem before pool notice.

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

cnx

Pointer to a prelude_connection_t object used within pool .

 

Returns

0 on success, a negative value if an error occured.


prelude_connection_pool_set_connection_string ()

int
prelude_connection_pool_set_connection_string
                               (prelude_connection_pool_t *pool,
                                const char *cfgstr);

Sets the connection string for pool . The connection string should be in the form of : "address". Special operand like || (OR) and && (AND), are also accepted: "address && address".

Where && means that alert sent using pool will go to both configured addresses, and || means that if the left address fails, the right address will be used.

prelude_connection_pool_init() should be used to initiates the connection.

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

cfgstr

Connection string.

 

Returns

0 on success, a negative value if an error occured.


prelude_connection_pool_get_connection_string ()

const char *
prelude_connection_pool_get_connection_string
                               (prelude_connection_pool_t *pool);

Used to query the connection string used by pool .

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

Returns

The connection string.


prelude_connection_pool_destroy ()

void
prelude_connection_pool_destroy (prelude_connection_pool_t *pool);

Destroys pool and all connections handled.

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

prelude_connection_pool_get_flags ()

prelude_connection_pool_flags_t
prelude_connection_pool_get_flags (prelude_connection_pool_t *pool);

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

Returns

the prelude_connection_pool_flags_t used in pool .


prelude_connection_pool_set_flags ()

void
prelude_connection_pool_set_flags (prelude_connection_pool_t *pool,
                                   prelude_connection_pool_flags_t flags);

Sets flags within pools .

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

flags

Flags to use for pool .

 

prelude_connection_pool_set_required_permission ()

void
prelude_connection_pool_set_required_permission
                               (prelude_connection_pool_t *pool,
                                prelude_connection_permission_t req_perm);

prelude_connection_pool_set_data ()

void
prelude_connection_pool_set_data (prelude_connection_pool_t *pool,
                                  void *data);

The user might use this function to associate data with pool . The data associated might be retrieved using prelude_connection_pool_get_data().

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

data

Pointer to user specific data.

 

prelude_connection_pool_get_data ()

void *
prelude_connection_pool_get_data (prelude_connection_pool_t *pool);

The user might use this function to query data associated with pool using prelude_connection_pool_set_data().

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

Returns

the user data associated to pool .


prelude_connection_pool_recv ()

int
prelude_connection_pool_recv (prelude_connection_pool_t *pool,
                              int timeout,
                              prelude_connection_t **outcon,
                              prelude_msg_t **outmsg);

This function queries the set of connections available in pool to see if events are waiting to be handled. If timeout is zero, then this function will return immediatly in case there is no event to be handled.

If timeout is -1, this function won't return until an event is available. Otherwise this function will return if there is no event after the specified number of second.

If an event is available, it will be read and store the prelude_connection_t object in the outcon pointer. If outmsg was specified, the message will be read and stored in there.

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

timeout

Time to wait for an event.

 

outcon

Pointer where the connection where an event happened should be stored.

 

outmsg

Pointer where the next message that will be read should be stored.

 

Returns

The number of handled events (0 or 1) or a negative value if an error occured.


prelude_connection_pool_check_event ()

int
prelude_connection_pool_check_event (prelude_connection_pool_t *pool,
                                     int timeout,
                                     int (*event_cb) (prelude_connection_pool_t *pool, prelude_connection_pool_event_t event, prelude_connection_t *cnx, void *extra),
                                     void *extra);

This function queries the set of connections available in pool to see if events are waiting to be handled. If timeout is zero, then this function will return immediatly in case there is no event to be handled.

If timeout is -1, this function won't return until an event is available. Otherwise this function will return if there is no event after the specified number of second.

For each event, event_cb is called with the concerned pool , the provided extra data, and the cnx where an event has occured.

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

timeout

Time to wait for an event.

 

event_cb

User provided callback function to call on received events.

 

extra

Pointer to user specific data provided to event_cb .

 

Returns

The number of handled events, or a negative value if an error occured.


prelude_connection_pool_set_global_event_handler ()

void
prelude_connection_pool_set_global_event_handler
                               (prelude_connection_pool_t *pool,
                                prelude_connection_pool_event_t wanted_events,
                                int (*callback) (prelude_connection_pool_t *pool, prelude_connection_pool_event_t events));

callback will be called each time one of the event specified in wanted_events happen to pool . However, contrary to prelude_connection_pool_set_event_handler(), the callback will be called only once per set of event.

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

wanted_events

Event the user want to be notified about.

 

callback

User specific callback to call when an event is available.

 

prelude_connection_pool_set_event_handler ()

void
prelude_connection_pool_set_event_handler
                               (prelude_connection_pool_t *pool,
                                prelude_connection_pool_event_t wanted_events,
                                int (*callback) (prelude_connection_pool_t *pool, prelude_connection_pool_event_t events, prelude_connection_t *cnx));

callback will be called each time one of the event specified in wanted_events happens to pool .

Parameters

pool

Pointer to a prelude_connection_pool_t object.

 

wanted_events

Event the user want to be notified about.

 

callback

User specific callback to call when an event is available.

 

Types and Values

enum prelude_connection_pool_flags_t

Members

PRELUDE_CONNECTION_POOL_FLAGS_RECONNECT

   

PRELUDE_CONNECTION_POOL_FLAGS_FAILOVER

   

enum prelude_connection_pool_event_t

Members

PRELUDE_CONNECTION_POOL_EVENT_INPUT

   

PRELUDE_CONNECTION_POOL_EVENT_DEAD

   

PRELUDE_CONNECTION_POOL_EVENT_ALIVE

   

prelude_connection_pool_t

typedef struct prelude_connection_pool prelude_connection_pool_t;