diff options
author | Max Kellermann <max@duempel.org> | 2012-08-15 21:32:34 +0200 |
---|---|---|
committer | Max Kellermann <max@duempel.org> | 2012-08-15 23:02:27 +0200 |
commit | a6ac0f89656b9ef374703d24bbb27316a705eadc (patch) | |
tree | 3706b1b8474ae06890595a8e20c8be011f6a162b /src/db/ProxyDatabasePlugin.cxx | |
parent | 4e1eb03287c1af889372ed4c63220a88d2032f78 (diff) |
DatabasePlugin: add method VisitUniqueTags()
Optimize the ProxyDatabase by invoking "list" on the peer, instead of
visiting all songs.
Diffstat (limited to 'src/db/ProxyDatabasePlugin.cxx')
-rw-r--r-- | src/db/ProxyDatabasePlugin.cxx | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/db/ProxyDatabasePlugin.cxx b/src/db/ProxyDatabasePlugin.cxx index 68ba5a54..f06728f8 100644 --- a/src/db/ProxyDatabasePlugin.cxx +++ b/src/db/ProxyDatabasePlugin.cxx @@ -62,6 +62,11 @@ public: VisitPlaylist visit_playlist, GError **error_r) const override; + virtual bool VisitUniqueTags(const DatabaseSelection &selection, + enum tag_type tag_type, + VisitString visit_string, + GError **error_r) const override; + protected: bool Configure(const struct config_param *param, GError **error_r); }; @@ -97,6 +102,17 @@ static constexpr struct { { TAG_NUM_OF_ITEM_TYPES, MPD_TAG_COUNT } }; +G_GNUC_CONST +static enum mpd_tag_type +Convert(enum tag_type tag_type) +{ + for (auto i = tag_table; i->d != TAG_NUM_OF_ITEM_TYPES; ++i) + if (i->d == tag_type) + return i->s; + + return MPD_TAG_COUNT; +} + static bool CheckError(const struct mpd_connection *connection, GError **error_r) { @@ -368,6 +384,42 @@ ProxyDatabase::Visit(const DatabaseSelection &selection, return success; } +bool +ProxyDatabase::VisitUniqueTags(const DatabaseSelection &selection, + enum tag_type tag_type, + VisitString visit_string, + GError **error_r) const +{ + enum mpd_tag_type tag_type2 = Convert(tag_type); + if (tag_type2 == MPD_TAG_COUNT) { + g_set_error_literal(error_r, libmpdclient_quark(), 0, + "Unsupported tag"); + return false; + } + + if (!mpd_search_db_tags(connection, tag_type2)) + return CheckError(connection, error_r); + + // TODO: match + (void)selection; + + if (!mpd_search_commit(connection)) + return CheckError(connection, error_r); + + bool result = true; + + struct mpd_pair *pair; + while (result && + (pair = mpd_recv_pair_tag(connection, tag_type2)) != nullptr) { + result = visit_string(pair->value, error_r); + mpd_return_pair(connection, pair); + } + + return mpd_response_finish(connection) && + CheckError(connection, error_r) && + result; +} + const DatabasePlugin proxy_db_plugin = { "proxy", ProxyDatabase::Create, |