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authorMax Kellermann <max@duempel.org>2014-01-10 23:21:53 +0100
committerMax Kellermann <max@duempel.org>2014-01-11 01:25:22 +0100
commit8351543c0f43ee281032ef712cc5168beb662d31 (patch)
tree8e7d24fe3a389fb8214da283951b511fac6e9492 /src/db/LazyDatabase.cxx
parent8add78ed5e2efd5421632baf45c3f1d64b43e771 (diff)
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db/upnp: move lazy Open() call to new class LazyDatabase
Generic approach for the workaround.
Diffstat (limited to 'src/db/LazyDatabase.cxx')
-rw-r--r--src/db/LazyDatabase.cxx103
1 files changed, 103 insertions, 0 deletions
diff --git a/src/db/LazyDatabase.cxx b/src/db/LazyDatabase.cxx
new file mode 100644
index 000000000..f767e89cd
--- /dev/null
+++ b/src/db/LazyDatabase.cxx
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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 Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "LazyDatabase.hxx"
+
+#include <assert.h>
+
+LazyDatabase::~LazyDatabase()
+{
+ assert(!open);
+
+ delete db;
+}
+
+bool
+LazyDatabase::EnsureOpen(Error &error) const
+{
+ if (open)
+ return true;
+
+ if (!db->Open(error))
+ return false;
+
+ open = true;
+ return true;
+}
+
+void
+LazyDatabase::Close()
+{
+ if (open) {
+ open = false;
+ db->Close();
+ }
+}
+
+Song *
+LazyDatabase::GetSong(const char *uri, Error &error) const
+{
+ return EnsureOpen(error)
+ ? db->GetSong(uri, error)
+ : nullptr;
+}
+
+void
+LazyDatabase::ReturnSong(Song *song) const
+{
+ assert(open);
+
+ db->ReturnSong(song);
+}
+
+bool
+LazyDatabase::Visit(const DatabaseSelection &selection,
+ VisitDirectory visit_directory,
+ VisitSong visit_song,
+ VisitPlaylist visit_playlist,
+ Error &error) const
+{
+ return EnsureOpen(error) &&
+ db->Visit(selection, visit_directory, visit_song,
+ visit_playlist, error);
+}
+
+bool
+LazyDatabase::VisitUniqueTags(const DatabaseSelection &selection,
+ TagType tag_type,
+ VisitString visit_string,
+ Error &error) const
+{
+ return EnsureOpen(error) &&
+ db->VisitUniqueTags(selection, tag_type, visit_string, error);
+}
+
+bool
+LazyDatabase::GetStats(const DatabaseSelection &selection,
+ DatabaseStats &stats, Error &error) const
+{
+ return EnsureOpen(error) && db->GetStats(selection, stats, error);
+}
+
+time_t
+LazyDatabase::GetUpdateStamp() const
+{
+ return open ? db->GetUpdateStamp() : 0;
+}