/*
This file is part of GNUnet
- (C) 2009 Christian Grothoff (and other contributing authors)
+ (C) 2009, 2010 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
/**
* Get handle for the statistics service.
*
- * @param sched scheduler to use
* @param subsystem name of subsystem using the service
* @param cfg services configuration in use
* @return handle to use
*/
struct GNUNET_STATISTICS_Handle
- *GNUNET_STATISTICS_create (struct GNUNET_SCHEDULER_Handle *sched,
- const char *subsystem,
+ *GNUNET_STATISTICS_create (const char *subsystem,
const struct GNUNET_CONFIGURATION_Handle *cfg);
int sync_first);
+/**
+ * Watch statistics from the peer (be notified whenever they change).
+ * Note that the only way to cancel a "watch" request is to destroy
+ * the statistics handle given as the first argument to this call.
+ *
+ * @param handle identification of the statistics service
+ * @param subsystem limit to the specified subsystem, never NULL
+ * @param name name of the statistic value, never NULL
+ * @param proc function to call on each value
+ * @param proc_cls closure for proc
+ * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ */
+int
+GNUNET_STATISTICS_watch (struct GNUNET_STATISTICS_Handle *handle,
+ const char *subsystem,
+ const char *name,
+ GNUNET_STATISTICS_Iterator proc,
+ void *proc_cls);
+
+
/**
* Continuation called by the "get_all" and "get" functions.
*
*/
typedef void (*GNUNET_STATISTICS_Callback) (void *cls, int success);
+/**
+ * Handle that can be used to cancel a statistics 'get' operation.
+ */
+struct GNUNET_STATISTICS_GetHandle;
+
/**
* Get statistic from the peer.
*
* @param cont continuation to call when done (can be NULL)
* @param proc function to call on each value
* @param cls closure for proc and cont
+ * @return NULL on error
*/
-void
+struct GNUNET_STATISTICS_GetHandle *
GNUNET_STATISTICS_get (struct GNUNET_STATISTICS_Handle *handle,
const char *subsystem,
const char *name,
GNUNET_STATISTICS_Callback cont,
GNUNET_STATISTICS_Iterator proc, void *cls);
+
+/**
+ * Cancel a 'get' request. Must be called before the 'cont'
+ * function is called.
+ *
+ * @param gh handle of the request to cancel
+ */
+void
+GNUNET_STATISTICS_get_cancel (struct GNUNET_STATISTICS_GetHandle *gh);
+
+
/**
* Set statistic value for the peer. Will always use our
* subsystem (the argument used when "handle" was created).