/*
  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
  This file is part of GlusterFS.

  This file is licensed to you under your choice of the GNU Lesser
  General Public License, version 3 or any later version (LGPLv3 or
  later), or the GNU General Public License, version 2 (GPLv2), in all
  cases as published by the Free Software Foundation.
*/

#include "glusterfs/event-history.h"
#include "glusterfs/libglusterfs-messages.h"

eh_t *
eh_new(size_t buffer_size, gf_boolean_t use_buffer_once,
       void (*destroy_buffer_data)(void *data))
{
    eh_t *history = NULL;
    buffer_t *buffer = NULL;

    history = GF_CALLOC(1, sizeof(eh_t), gf_common_mt_eh_t);
    if (!history) {
        goto out;
    }

    buffer = cb_buffer_new(buffer_size, use_buffer_once, destroy_buffer_data);
    if (!buffer) {
        GF_FREE(history);
        history = NULL;
        goto out;
    }

    history->buffer = buffer;

    pthread_mutex_init(&history->lock, NULL);
out:
    return history;
}

void
eh_dump(eh_t *history, void *data,
        int(dump_fn)(circular_buffer_t *buffer, void *data))
{
    if (!history) {
        gf_msg_debug("event-history", 0, "history is NULL");
        goto out;
    }

    cb_buffer_dump(history->buffer, data, dump_fn);

out:
    return;
}

int
eh_save_history(eh_t *history, void *data)
{
    int ret = -1;

    ret = cb_add_entry_buffer(history->buffer, data);

    return ret;
}

int
eh_destroy(eh_t *history)
{
    if (!history) {
        gf_msg("event-history", GF_LOG_INFO, 0, LG_MSG_INVALID_ARG,
               "history for the xlator is NULL");
        return -1;
    }

    cb_buffer_destroy(history->buffer);
    history->buffer = NULL;

    pthread_mutex_destroy(&history->lock);

    GF_FREE(history);

    return 0;
}