/*
This file is part of GNUnet
- (C) 2013, 2014 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2013, 2014 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
/**
- * @file include/gnunet_set_service.h
- * @brief two-peer set operations
* @author Florian Dold
* @author Christian Grothoff
+ *
+ * @file
+ * Two-peer set operations
+ *
+ * @defgroup set Set service
+ * Two-peer set operations
+ *
+ * @see [Documentation](https://gnunet.org/set-subsystem)
+ *
+ * @{
*/
#ifndef GNUNET_SET_SERVICE_H
enum GNUNET_SET_OperationType
{
/**
- * A purely local set that does not support any
- * operation.
+ * A purely local set that does not support any operation.
*/
GNUNET_SET_OPERATION_NONE,
GNUNET_SET_OPERATION_UNION
};
+
/**
* Status for the result callback
*/
enum GNUNET_SET_Status
{
/**
- * Everything went ok.
+ * Everything went ok, we are transmitting an element of the
+ * result (in set, or to be removed from set, depending on
+ * the `enum GNUNET_SET_ResultMode`).
+ *
+ * Only applies to
+ * #GNUNET_SET_RESULT_FULL,
+ * #GNUNET_SET_RESULT_ADDED,
+ * #GNUNET_SET_RESULT_REMOVED,
*/
GNUNET_SET_STATUS_OK,
/**
- * There was a timeout.
+ * Element should be added to the result set
+ * of the local peer, i.e. the local peer is
+ * missing an element.
+ *
+ * Only applies to #GNUNET_SET_RESULT_SYMMETRIC
*/
- GNUNET_SET_STATUS_TIMEOUT,
+ GNUNET_SET_STATUS_ADD_LOCAL,
+
+ /**
+ * Element should be added to the result set
+ * of the remove peer, i.e. the remote peer is
+ * missing an element.
+ *
+ * Only applies to #GNUNET_SET_RESULT_SYMMETRIC
+ */
+ GNUNET_SET_STATUS_ADD_REMOTE,
/**
* The other peer refused to to the operation with us,
GNUNET_SET_STATUS_FAILURE,
/**
- * Success, all elements have been returned (but the other
- * peer might still be receiving some from us, so we are not done).
+ * Success, all elements have been returned (but the other peer
+ * might still be receiving some from us, so we are not done). Only
+ * used during UNION operation.
*/
GNUNET_SET_STATUS_HALF_DONE,
{
/**
* Client gets every element in the resulting set.
+ *
+ * Only supported for set intersection.
*/
GNUNET_SET_RESULT_FULL,
/**
- * Client gets only elements that have been added to the set.
- * Only works with set union.
+ * Client gets notified of the required changes
+ * for both the local and the remote set.
+ *
+ * Only supported for set
*/
- GNUNET_SET_RESULT_ADDED,
+ GNUNET_SET_RESULT_SYMMETRIC,
/**
* Client gets only elements that have been removed from the set.
- * Only works with set intersection.
+ *
+ * Only supported for set intersection.
*/
- GNUNET_SET_RESULT_REMOVED
+ GNUNET_SET_RESULT_REMOVED,
+
+ /**
+ * Client gets only elements that have been removed from the set.
+ *
+ * Only supported for set union.
+ */
+ GNUNET_SET_RESULT_ADDED
};
+typedef void
+(*GNUNET_SET_CopyReadyCallback) (void *cls,
+ struct GNUNET_SET_Handle *copy);
+
+
/**
* Create an empty set, supporting the specified operation.
*
void *cont_cls);
+void
+GNUNET_SET_copy_lazy (struct GNUNET_SET_Handle *set,
+ GNUNET_SET_CopyReadyCallback cb,
+ void *cls);
+
+
/**
* Destroy the set handle, and free all associated resources.
+ * Iterations must have completed (or be explicitly canceled)
+ * before destroying the corresponding set. Operations may
+ * still be pending when a set is destroyed.
+ *
+ * @param set set to destroy
*/
void
GNUNET_SET_destroy (struct GNUNET_SET_Handle *set);
/**
- * Cancel the given listen operation.
- * After calling cancel, the listen callback for this listen handle
- * will not be called again.
+ * Cancel the given listen operation. After calling cancel, the
+ * listen callback for this listen handle will not be called again.
*
* @param lh handle for the listen operation
*/
/**
- * Cancel the given set operation.
- * May not be called after the operation's `GNUNET_SET_ResultIterator` has been
- * called with a status that indicates error, timeout or done.
+ * Cancel the given set operation. May not be called after the
+ * operation's `GNUNET_SET_ResultIterator` has been called with a
+ * status that indicates error, timeout or done.
*
* @param oh set operation to cancel
*/
* @param iter the iterator to call for each element
* @param iter_cls closure for @a iter
* @return #GNUNET_YES if the iteration started successfuly,
- * #GNUNET_SYSERR if the set is invalid (e.g. the server crashed, disconnected)
+ * #GNUNET_NO if another iteration was still active,
+ * #GNUNET_SYSERR if the set is invalid (e.g. the server crashed, disconnected)
*/
int
GNUNET_SET_iterate (struct GNUNET_SET_Handle *set,
GNUNET_SET_ElementIterator iter,
void *iter_cls);
+/**
+ * Stop iteration over all elements in the given set. Can only
+ * be called before the iteration has "naturally" completed its
+ * turn.
+ *
+ * @param set the set to stop iterating over
+ */
+void
+GNUNET_SET_iterate_cancel (struct GNUNET_SET_Handle *set);
+
+/**
+ * Create a copy of an element. The copy
+ * must be GNUNET_free-d by the caller.
+ *
+ * @param element the element to copy
+ * @return the copied element
+ */
+struct GNUNET_SET_Element *
+GNUNET_SET_element_dup (const struct GNUNET_SET_Element *element);
+
+/**
+ * Hash a set element.
+ *
+ * @param element the element that should be hashed
+ * @param ret_hash a pointer to where the hash of @a element
+ * should be stored
+ */
+void
+GNUNET_SET_element_hash (const struct GNUNET_SET_Element *element, struct GNUNET_HashCode *ret_hash);
+
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#endif
+
+/** @} */ /* end of group */