96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
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/*
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* ProcessEvents.h
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2023 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "flow/ProcessEvents.h"
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#include <unordered_map>
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#include <vector>
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namespace {
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struct EventImpl {
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using Id = intptr_t;
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std::vector<StringRef> names;
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ProcessEvents::Callback callback;
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EventImpl(std::vector<StringRef> names, ProcessEvents::Callback callback)
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: names(std::move(names)), callback(std::move(callback)) {
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addEvent();
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}
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~EventImpl() { removeEvent(); }
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Id id() const { return reinterpret_cast<intptr_t>(this); }
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void addEvent();
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void removeEvent();
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};
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struct ProcessEventsImpl {
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std::unordered_map<StringRef, std::unordered_map<EventImpl::Id, EventImpl*>> events;
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void trigger(StringRef name, StringRef msg, Error const& e) const {
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auto iter = events.find(name);
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// strictly speaking this isn't a bug, but having callbacks that aren't caught
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// by anyone could mean that something was misspelled. Therefore, the safe thing
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// to do is to abort.
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ASSERT(iter != events.end());
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std::unordered_map<EventImpl::Id, EventImpl*> callbacks;
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// These two iterations are necessary, since some callbacks might appear in multiple maps
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for (auto const& c : iter->second) {
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callbacks.insert(c);
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}
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// after we collected all unique callbacks we can call each
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for (auto const& c : callbacks) {
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c.second->callback(name, msg, e);
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}
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}
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};
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ProcessEventsImpl impl;
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void EventImpl::addEvent() {
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for (auto const& name : names) {
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impl.events[name].emplace(this->id(), this);
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}
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}
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void EventImpl::removeEvent() {
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for (auto const& name : names) {
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impl.events[name].erase(this->id());
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}
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}
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} // namespace
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namespace ProcessEvents {
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void trigger(StringRef name, StringRef msg, Error const& e) {
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impl.trigger(name, msg, e);
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}
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Event::Event(StringRef name, Callback callback) {
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impl = new EventImpl({ std::move(name) }, std::move(callback));
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}
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Event::Event(std::vector<StringRef> names, Callback callback) {
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impl = new EventImpl(std::move(names), std::move(callback));
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}
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Event::~Event() {
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delete reinterpret_cast<EventImpl*>(impl);
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}
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} // namespace ProcessEvents
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