42d5b05f54
Clarify that the method is not a freestanding insertion method but should only be used after insert_check().
125 lines
2.7 KiB
C++
125 lines
2.7 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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#include "RemoteTagCache.hxx"
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#include "RemoteTagCacheHandler.hxx"
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#include "lib/fmt/ExceptionFormatter.hxx"
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#include "input/ScanTags.hxx"
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#include "util/DeleteDisposer.hxx"
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#include "util/Domain.hxx"
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#include "Log.hxx"
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static constexpr Domain remote_tag_cache_domain("remote_tag_cache");
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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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{
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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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auto [tag, value] = map.insert_check(uri);
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if (value) {
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auto item = new Item(*this, uri);
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map.insert_commit(tag, *item);
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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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FmtError(remote_tag_cache_domain,
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"Failed to scan tags of '{}': {}",
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uri, std::current_exception());
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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 (tag->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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idle_list.erase(waiting_list.iterator_to(*tag));
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invoke_list.push_back(*tag);
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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::scoped_lock<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::scoped_lock<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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FmtError(remote_tag_cache_domain,
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"Failed to scan tags of '{}': {}", uri, e);
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scanner.reset();
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const std::scoped_lock<Mutex> lock(parent.mutex);
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parent.ItemResolved(*this);
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}
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