+/**
+ * collection4 - data_provider.h
+ * Copyright (C) 2010 Florian octo Forster
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This program 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA
+ *
+ * Authors:
+ * Florian octo Forster <ff at octo.it>
+ **/
+
+#ifndef DATA_PROVIDER_H
+#define DATA_PROVIDER_H 1
+
+#include "graph_types.h"
+
+#include <time.h>
+
+typedef struct timespec dp_time_t;
+
+struct dp_data_point_s
+{
+ dp_time_t time;
+ double value;
+};
+typedef struct dp_data_point_s dp_data_point_t;
+
+/* Callback passed to the "get_idents" function. */
+typedef int (*dp_get_idents_callback) (const graph_ident_t *, void *);
+
+/* Callback passed to the "get_ident_ds_names" function. */
+typedef int (*dp_list_get_ident_ds_names_callback) (const graph_ident_t *,
+ const char *ds_name, void *);
+
+/* Callback passed to the "get_ident_data" function. */
+typedef int (*dp_get_ident_data_callback) (graph_ident_t *, const char *ds_name,
+ const dp_data_point_t *, void *);
+
+struct data_provider_s
+{
+ int (*get_idents) (void *priv, dp_get_idents_callback, void *);
+ int (*get_ident_ds_names) (void *priv, graph_ident_t *,
+ dp_list_get_ident_ds_names_callback, void *);
+ int (*get_ident_data) (void *priv,
+ graph_ident_t *, const char *ds_name,
+ dp_time_t begin, dp_time_t end,
+ dp_get_ident_data_callback, void *);
+ /* Optional method: Prints graph to STDOUT, including HTTP header. */
+ int (*print_graph) (void *priv, graph_config_t *cfg, graph_instance_t *inst);
+ void *private_data;
+};
+typedef struct data_provider_s data_provider_t;
+
+#endif /* DATA_PROVIDER_H */
+/* vim: set sw=2 sts=2 et fdm=marker : */