ce49d99c2f
Since we switched from autotools to Meson in commit
94592c1406, we don't need to include
`config.h` early to properly enable large file support. Meson passes
the required macros on the compiler command line instead of defining
them in `config.h`.
This means we can include `config.h` at any time, whenever we want to
check its macros, and there are no ordering constraints.
140 lines
3.4 KiB
C++
140 lines
3.4 KiB
C++
/*
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* Copyright 2003-2018 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 "RemoteTagCache.hxx"
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#include "RemoteTagCacheHandler.hxx"
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#include "input/ScanTags.hxx"
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#include "util/DeleteDisposer.hxx"
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#include "Log.hxx"
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RemoteTagCache::RemoteTagCache(EventLoop &event_loop,
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RemoteTagCacheHandler &_handler) noexcept
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:handler(_handler),
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defer_invoke_handler(event_loop, BIND_THIS_METHOD(InvokeHandlers)),
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map(typename KeyMap::bucket_traits(&buckets.front(), buckets.size()))
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{
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}
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RemoteTagCache::~RemoteTagCache() noexcept
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{
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map.clear_and_dispose(DeleteDisposer());
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}
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void
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RemoteTagCache::Lookup(const std::string &uri) noexcept
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{
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std::unique_lock<Mutex> lock(mutex);
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KeyMap::insert_commit_data hint;
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auto result = map.insert_check(uri, Item::Hash(), Item::Equal(), hint);
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if (result.second) {
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auto *item = new Item(*this, uri);
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map.insert_commit(*item, hint);
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waiting_list.push_back(*item);
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lock.unlock();
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try {
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item->scanner = InputScanTags(uri.c_str(), *item);
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if (!item->scanner) {
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/* unsupported */
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lock.lock();
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ItemResolved(*item);
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return;
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}
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item->scanner->Start();
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} catch (...) {
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FormatError(std::current_exception(),
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"Failed to scan tags of '%s'",
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uri.c_str());
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item->scanner.reset();
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lock.lock();
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ItemResolved(*item);
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return;
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}
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} else if (result.first->scanner) {
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/* already scanning this one - no-op */
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} else {
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/* already finished: re-invoke the handler */
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auto &item = *result.first;
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idle_list.erase(waiting_list.iterator_to(item));
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invoke_list.push_back(item);
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ScheduleInvokeHandlers();
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}
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}
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void
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RemoteTagCache::ItemResolved(Item &item) noexcept
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{
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waiting_list.erase(waiting_list.iterator_to(item));
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invoke_list.push_back(item);
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ScheduleInvokeHandlers();
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}
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void
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RemoteTagCache::InvokeHandlers() noexcept
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{
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const std::lock_guard<Mutex> lock(mutex);
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while (!invoke_list.empty()) {
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auto &item = invoke_list.front();
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invoke_list.pop_front();
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idle_list.push_back(item);
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const ScopeUnlock unlock(mutex);
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handler.OnRemoteTag(item.uri.c_str(), item.tag);
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}
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/* evict items if there are too many */
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while (map.size() > MAX_SIZE && !idle_list.empty()) {
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auto *item = &idle_list.front();
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idle_list.pop_front();
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map.erase(map.iterator_to(*item));
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delete item;
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}
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}
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void
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RemoteTagCache::Item::OnRemoteTag(Tag &&_tag) noexcept
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{
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tag = std::move(_tag);
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scanner.reset();
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const std::lock_guard<Mutex> lock(parent.mutex);
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parent.ItemResolved(*this);
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}
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void
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RemoteTagCache::Item::OnRemoteTagError(std::exception_ptr e) noexcept
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{
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FormatError(e, "Failed to scan tags of '%s'", uri.c_str());
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scanner.reset();
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const std::lock_guard<Mutex> lock(parent.mutex);
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parent.ItemResolved(*this);
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}
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