92 lines
2.3 KiB
C++
92 lines
2.3 KiB
C++
/*
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* Copyright 2003-2017 The Music Player Daemon Project
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* http://www.musicpd.org
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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 2 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "InotifyQueue.hxx"
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#include "InotifyDomain.hxx"
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#include "Service.hxx"
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#include "Log.hxx"
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#include "util/StringCompare.hxx"
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/**
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* Wait this long after the last change before calling
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* update_enqueue(). This increases the probability that updates can
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* be bundled.
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*/
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static constexpr std::chrono::steady_clock::duration INOTIFY_UPDATE_DELAY =
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std::chrono::seconds(5);
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void
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InotifyQueue::OnTimeout()
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{
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unsigned id;
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while (!queue.empty()) {
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const char *uri_utf8 = queue.front().c_str();
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id = update.Enqueue(uri_utf8, false);
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if (id == 0) {
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/* retry later */
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Schedule(INOTIFY_UPDATE_DELAY);
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return;
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}
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FormatDebug(inotify_domain, "updating '%s' job=%u",
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uri_utf8, id);
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queue.pop_front();
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}
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}
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gcc_pure
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static bool
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path_in(const char *path, const char *possible_parent)
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{
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if (StringIsEmpty(path))
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return true;
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auto rest = StringAfterPrefix(path, possible_parent);
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return rest != nullptr &&
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(StringIsEmpty(rest) || rest[0] == '/');
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}
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void
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InotifyQueue::Enqueue(const char *uri_utf8)
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{
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Schedule(INOTIFY_UPDATE_DELAY);
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for (auto i = queue.begin(), end = queue.end(); i != end;) {
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const char *current_uri = i->c_str();
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if (path_in(uri_utf8, current_uri))
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/* already enqueued */
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return;
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if (path_in(current_uri, uri_utf8))
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/* existing path is a sub-path of the new
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path; we can dequeue the existing path and
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update the new path instead */
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i = queue.erase(i);
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else
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++i;
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}
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queue.emplace_back(uri_utf8);
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}
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