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Diffstat (limited to '')
-rw-r--r-- | src/StateFile.cxx | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/src/StateFile.cxx b/src/StateFile.cxx new file mode 100644 index 000000000..b78056520 --- /dev/null +++ b/src/StateFile.cxx @@ -0,0 +1,122 @@ +/* + * 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 "StateFile.hxx" +#include "OutputState.hxx" +#include "PlaylistState.hxx" +#include "TextFile.hxx" +#include "Partition.hxx" +#include "Volume.hxx" +#include "event/Loop.hxx" + +#include <glib.h> +#include <assert.h> +#include <string.h> +#include <errno.h> + +#undef G_LOG_DOMAIN +#define G_LOG_DOMAIN "state_file" + +StateFile::StateFile(const char *_path, Partition &_partition, EventLoop &_loop) + :TimeoutMonitor(_loop), path(_path), partition(_partition), + prev_volume_version(0), prev_output_version(0), + prev_playlist_version(0) +{ + ScheduleSeconds(5 * 60); +} + +void +StateFile::Write() +{ + g_debug("Saving state file %s", path.c_str()); + + FILE *fp = fopen(path.c_str(), "w"); + if (G_UNLIKELY(!fp)) { + g_warning("failed to create %s: %s", + path.c_str(), g_strerror(errno)); + return; + } + + save_sw_volume_state(fp); + audio_output_state_save(fp); + playlist_state_save(fp, &partition.playlist, &partition.pc); + + fclose(fp); + + prev_volume_version = sw_volume_state_get_hash(); + prev_output_version = audio_output_state_get_version(); + prev_playlist_version = playlist_state_get_hash(&partition.playlist, + &partition.pc); +} + +void +StateFile::Read() +{ + bool success; + + g_debug("Loading state file %s", path.c_str()); + + TextFile file(path.c_str()); + if (file.HasFailed()) { + g_warning("failed to open %s: %s", + path.c_str(), g_strerror(errno)); + return; + } + + const char *line; + while ((line = file.ReadLine()) != NULL) { + success = read_sw_volume_state(line) || + audio_output_state_read(line) || + playlist_state_restore(line, file, &partition.playlist, + &partition.pc); + if (!success) + g_warning("Unrecognized line in state file: %s", line); + } + + prev_volume_version = sw_volume_state_get_hash(); + prev_output_version = audio_output_state_get_version(); + prev_playlist_version = playlist_state_get_hash(&partition.playlist, + &partition.pc); +} + +inline void +StateFile::AutoWrite() +{ + if (prev_volume_version == sw_volume_state_get_hash() && + prev_output_version == audio_output_state_get_version() && + prev_playlist_version == playlist_state_get_hash(&partition.playlist, + &partition.pc)) + /* nothing has changed - don't save the state file, + don't spin up the hard disk */ + return; + + Write(); +} + +/** + * This function is called every 5 minutes by the GLib main loop, and + * saves the state file. + */ +bool +StateFile::OnTimeout() +{ + AutoWrite(); + return true; +} |