src/plugin.[ch]: Implement "missing" callbacks.

This is a first step towards moving the threshold checking code into
a plugin.

diff --git a/src/plugin.c b/src/plugin.c
index f6bc506..e32c8f9 100644 (file)
--- a/src/plugin.c
+++ b/src/plugin.c
@@ -1,6 +1,6 @@
 /**
  * collectd - src/plugin.c
- * Copyright (C) 2005-2009  Florian octo Forster
+ * Copyright (C) 2005-2010  Florian octo Forster
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -16,7 +16,7 @@
  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  *
  * Authors:
- *   Florian octo Forster <octo at verplant.org>
+ *   Florian octo Forster <octo at collectd.org>
  *   Sebastian Harl <sh at tokkee.org>
  **/
 
@@ -74,6 +74,7 @@ typedef struct read_func_s read_func_t;
 static llist_t *list_init;
 static llist_t *list_write;
 static llist_t *list_flush;
+static llist_t *list_missing;
 static llist_t *list_shutdown;
 static llist_t *list_log;
 static llist_t *list_notification;
@@ -836,6 +837,13 @@ int plugin_register_flush (const char *name,
                                (void *) callback, ud));
 } /* int plugin_register_flush */
 
+int plugin_register_missing (const char *name,
+               plugin_missing_cb callback, user_data_t *ud)
+{
+       return (create_register_callback (&list_missing, name,
+                               (void *) callback, ud));
+} /* int plugin_register_missing */
+
 int plugin_register_shutdown (char *name,
                int (*callback) (void))
 {
@@ -1022,6 +1030,11 @@ int plugin_unregister_flush (const char *name)
        return (plugin_unregister (list_flush, name));
 }
 
+int plugin_unregister_missing (const char *name)
+{
+       return (plugin_unregister (list_missing, name));
+}
+
 int plugin_unregister_shutdown (const char *name)
 {
        return (plugin_unregister (list_shutdown, name));
@@ -1321,6 +1334,7 @@ void plugin_shutdown_all (void)
         * the real free function when registering the write callback. This way
         * the data isn't freed twice. */
        destroy_all_callbacks (&list_flush);
+       destroy_all_callbacks (&list_missing);
        destroy_all_callbacks (&list_write);
 
        destroy_all_callbacks (&list_notification);
@@ -1328,6 +1342,44 @@ void plugin_shutdown_all (void)
        destroy_all_callbacks (&list_log);
 } /* void plugin_shutdown_all */
 
+int plugin_dispatch_missing (const value_list_t *vl) /* {{{ */
+{
+  llentry_t *le;
+
+  if (list_missing == NULL)
+    return (0);
+
+  le = llist_head (list_missing);
+  while (le != NULL)
+  {
+    callback_func_t *cf;
+    plugin_missing_cb callback;
+    int status;
+
+    cf = le->value;
+    callback = cf->cf_callback;
+
+    status = (*callback) (vl);
+    if (status != 0)
+    {
+      if (status < 0)
+      {
+        ERROR ("plugin_dispatch_missing: Callback function \"%s\" "
+            "failed with status %i.",
+            le->key, status);
+        return (status);
+      }
+      else
+      {
+        return (0);
+      }
+    }
+
+    le = le->next;
+  }
+  return (0);
+} /* int }}} plugin_dispatch_missing */
+
 int plugin_dispatch_values (value_list_t *vl)
 {
        int status;

diff --git a/src/plugin.h b/src/plugin.h
index 490aed0..bc873b0 100644 (file)
--- a/src/plugin.h
+++ b/src/plugin.h
@@ -2,7 +2,7 @@
 #define PLUGIN_H
 /**
  * collectd - src/plugin.h
- * Copyright (C) 2005-2008  Florian octo Forster
+ * Copyright (C) 2005-2010  Florian octo Forster
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -18,7 +18,7 @@
  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  *
  * Authors:
- *   Florian octo Forster <octo at verplant.org>
+ *   Florian octo Forster <octo at collectd.org>
  *   Sebastian Harl <sh at tokkee.org>
  **/
 
@@ -170,6 +170,10 @@ typedef int (*plugin_write_cb) (const data_set_t *, const value_list_t *,
                user_data_t *);
 typedef int (*plugin_flush_cb) (cdtime_t timeout, const char *identifier,
                user_data_t *);
+/* "missing" callback. Returns less than zero on failure, zero if other
+ * callbacks should be called, greater than zero if no more callbacks should be
+ * called. */
+typedef int (*plugin_missing_cb) (const value_list_t *);
 typedef void (*plugin_log_cb) (int severity, const char *message,
                user_data_t *);
 typedef int (*plugin_shutdown_cb) (void);
@@ -273,6 +277,8 @@ int plugin_register_write (const char *name,
                plugin_write_cb callback, user_data_t *user_data);
 int plugin_register_flush (const char *name,
                plugin_flush_cb callback, user_data_t *user_data);
+int plugin_register_missing (const char *name,
+               plugin_missing_cb callback, user_data_t *user_data);
 int plugin_register_shutdown (char *name,
                plugin_shutdown_cb callback);
 int plugin_register_data_set (const data_set_t *ds);
@@ -288,6 +294,7 @@ int plugin_unregister_read (const char *name);
 int plugin_unregister_read_group (const char *group);
 int plugin_unregister_write (const char *name);
 int plugin_unregister_flush (const char *name);
+int plugin_unregister_missing (const char *name);
 int plugin_unregister_shutdown (const char *name);
 int plugin_unregister_data_set (const char *name);
 int plugin_unregister_log (const char *name);
@@ -309,6 +316,7 @@ int plugin_unregister_notification (const char *name);
  *              function.
  */
 int plugin_dispatch_values (value_list_t *vl);
+int plugin_dispatch_missing (const value_list_t *vl);
 
 int plugin_dispatch_notification (const notification_t *notif);