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70962fabf9
Xapian provides an interator-based interface to all search results. So it was natural to make notmuch_messages_t be iterator-based as well. Which we did originally. But we ran into a problem when we added two APIs, (_get_replies and _get_toplevel_messages), that want to return a messages iterator that's *not* based on a Xapian search result. My original compromise was to use notmuch_message_list_t as the basis for all returned messages iterators in the public interface. This had the problem of introducing extra latency at the beginning of a search for messages, (the call would block while iterating over all results from Xapian, converting to a message list). In this commit, we remove that initial conversion and instead provide two alternate implementations of notmuch_messages_t (one on top of a Xapian iterator and one on top of a message list). With this change, I tested a "notmuch search" returning *many* results as previously taking about 7 seconds before results started appearing, and now taking only 2 seconds.
142 lines
3.6 KiB
C
142 lines
3.6 KiB
C
/* messages.c - Iterator for a set of messages
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*
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* Copyright © 2009 Carl Worth
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see http://www.gnu.org/licenses/ .
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*
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* Author: Carl Worth <cworth@cworth.org>
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*/
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#include "notmuch-private.h"
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/* Create a new notmuch_message_list_t object, with 'ctx' as its
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* talloc owner.
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*
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* This function can return NULL in case of out-of-memory.
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*/
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notmuch_message_list_t *
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_notmuch_message_list_create (const void *ctx)
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{
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notmuch_message_list_t *list;
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list = talloc (ctx, notmuch_message_list_t);
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if (unlikely (list == NULL))
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return NULL;
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list->head = NULL;
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list->tail = &list->head;
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return list;
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}
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/* Append 'node' (which can of course point to an arbitrarily long
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* list of nodes) to the end of 'list'.
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*/
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void
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_notmuch_message_list_append (notmuch_message_list_t *list,
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notmuch_message_node_t *node)
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{
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*(list->tail) = node;
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list->tail = &node->next;
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}
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/* Allocate a new node for 'message' and append it to the end of
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* 'list'.
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*/
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void
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_notmuch_message_list_add_message (notmuch_message_list_t *list,
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notmuch_message_t *message)
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{
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notmuch_message_node_t *node = talloc (list, notmuch_message_node_t);
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node->message = message;
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node->next = NULL;
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_notmuch_message_list_append (list, node);
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}
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notmuch_messages_t *
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_notmuch_messages_create (notmuch_message_list_t *list)
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{
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notmuch_messages_t *messages;
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if (list->head == NULL)
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return NULL;
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messages = talloc (list, notmuch_messages_t);
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if (unlikely (messages == NULL))
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return NULL;
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messages->is_of_list_type = TRUE;
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messages->iterator = list->head;
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return messages;
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}
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/* We're using the "is_of_type_list" to conditionally defer to the
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* notmuch_mset_messages_t implementation of notmuch_messages_t in
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* query.cc. It's ugly that that's over in query.cc, and it's ugly
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* that we're not using a union here. Both of those uglies are due to
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* C++:
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*
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* 1. I didn't want to force a C++ header file onto
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* notmuch-private.h and suddenly subject all our code to a
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* C++ compiler and its rules.
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*
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* 2. C++ won't allow me to put C++ objects, (with non-trivial
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* constructors) into a union anyway. Even though I'd
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* carefully control object construction with placement new
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* anyway. *sigh*
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*/
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notmuch_bool_t
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notmuch_messages_has_more (notmuch_messages_t *messages)
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{
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if (messages == NULL)
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return FALSE;
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if (! messages->is_of_list_type)
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return _notmuch_mset_messages_has_more (messages);
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return (messages->iterator != NULL);
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}
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notmuch_message_t *
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notmuch_messages_get (notmuch_messages_t *messages)
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{
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if (! messages->is_of_list_type)
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return _notmuch_mset_messages_get (messages);
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if (messages->iterator == NULL)
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return NULL;
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return messages->iterator->message;
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}
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void
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notmuch_messages_advance (notmuch_messages_t *messages)
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{
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if (! messages->is_of_list_type)
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return _notmuch_mset_messages_advance (messages);
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if (messages->iterator == NULL)
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return;
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messages->iterator = messages->iterator->next;
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}
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void
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notmuch_messages_destroy (notmuch_messages_t *messages)
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{
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talloc_free (messages);
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}
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