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/*
* Copyright (C) 2021 Codership Oy <info@codership.com>
*
* This file is part of wsrep-API.
*
* Wsrep-API is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* Wsrep-API is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with wsrep-API. If not, see <https://www.gnu.org/licenses/>.
*/
/** @file wsrep_event_service.h
*
* This file defines interface for various unordered events generated by the
* cluster or the provider.
*
* An event has a name and a payload, both are null-terminated strings.
* (It is intended that payload is a JSON encoded structure).
* The name serves to distinguish the events to pass them to respective
* handlers.
*
* The provider which is capable of using the service interface v1 must
* export the following functions.
*
* int wsrep_init_event_service_v1(wsrep_event_service_v1_t*)
* void wsrep_deinit_event_service_v1()
*
* which can be probed by the application.
*
* The application must initialize the service via above init function
* before the provider is initialized via wsrep->init(). The deinit
* function must be called after the provider side resources have been
* released via wsrep->free().
*/
#ifndef WSREP_EVENT_SERVICE_H
#define WSREP_EVENT_SERVICE_H
#include "wsrep_api.h"
#include <sys/types.h> /* posix size_t */
#ifdef __cplusplus
extern "C"
{
#endif /* __cplusplus */
/**
* Type tag for application defined event processing context.
*
* Application may pass pointer to the context when initializing
* the event service. This pointer is passed a first parameter for
* each service call.
*/
typedef struct wsrep_event_context wsrep_event_context_t;
/**
* Process an event
*
* @param name event name
* @param value JSON enconded event value
*
* @return void, it is up to the receiver to decide what to do about
* possible error.
*/
typedef void (*wsrep_event_cb_t)(wsrep_event_context_t*,
const char* name, const char* value);
/**
* Event service struct.
*
* A pointer to this struct must be passed to the call to
* wsrep_init_event_service_v1.
*
* The application must provide implementation to all functions defined
* in this struct.
*/
typedef struct wsrep_event_service_v1_st
{
/* Event receiver callback */
wsrep_event_cb_t event_cb;
/* Pointer to application defined event context. */
wsrep_event_context_t* context;
} wsrep_event_service_v1_t;
#ifdef __cplusplus
}
#endif /* __cplusplus */
#define WSREP_EVENT_SERVICE_INIT_FUNC_V1 "wsrep_init_event_service_v1"
#define WSREP_EVENT_SERVICE_DEINIT_FUNC_V1 "wsrep_deinit_event_service_v1"
#endif /* WSREP_EVENT_SERVICE_H */
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