70 lines
2.0 KiB
C++
70 lines
2.0 KiB
C++
/*
|
|
* Copyright 2003-2017 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" /* must be first for large file support */
|
|
#include "Remove.hxx"
|
|
#include "UpdateDomain.hxx"
|
|
#include "db/DatabaseListener.hxx"
|
|
#include "Log.hxx"
|
|
|
|
/**
|
|
* Safely remove songs from the database. This must be done in the
|
|
* main task, because some (thread-unsafe) data structures are
|
|
* available only there.
|
|
*/
|
|
void
|
|
UpdateRemoveService::RunDeferred() noexcept
|
|
{
|
|
/* copy the list and unlock the mutex before invoking
|
|
callbacks */
|
|
|
|
std::forward_list<std::string> copy;
|
|
|
|
{
|
|
const std::lock_guard<Mutex> protect(mutex);
|
|
std::swap(uris, copy);
|
|
}
|
|
|
|
for (const auto &uri : copy) {
|
|
FormatDefault(update_domain, "removing %s", uri.c_str());
|
|
listener.OnDatabaseSongRemoved(uri.c_str());
|
|
}
|
|
|
|
/* note: if Remove() was called in the meantime, it saw an
|
|
empty list, and scheduled another event */
|
|
}
|
|
|
|
void
|
|
UpdateRemoveService::Remove(std::string &&uri)
|
|
{
|
|
bool was_empty;
|
|
|
|
{
|
|
const std::lock_guard<Mutex> protect(mutex);
|
|
was_empty = uris.empty();
|
|
uris.emplace_front(std::move(uri));
|
|
}
|
|
|
|
/* inject an event into the main thread, but only if the list
|
|
was empty; if it was not, then that even was already
|
|
pending */
|
|
if (was_empty)
|
|
defer.Schedule();
|
|
}
|