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61 lines
2.0 KiB
61 lines
2.0 KiB
////////////////////////////////////////////////////////////////////////////
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//
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// Copyright 2016 Realm Inc.
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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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////////////////////////////////////////////////////////////////////////////
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#include "collection_notifications.hpp"
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#include "impl/collection_notifier.hpp"
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using namespace realm;
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using namespace realm::_impl;
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NotificationToken::NotificationToken(std::shared_ptr<_impl::CollectionNotifier> notifier, uint64_t token)
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: m_notifier(std::move(notifier)), m_token(token)
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{
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}
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NotificationToken::~NotificationToken()
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{
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// m_notifier itself (and not just the pointed-to thing) needs to be accessed
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// atomically to ensure that there are no data races when the token is
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// destroyed after being modified on a different thread.
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// This is needed despite the token not being thread-safe in general as
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// users find it very surprising for obj-c objects to care about what
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// thread they are deallocated on.
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if (auto notifier = m_notifier.exchange({})) {
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notifier->remove_callback(m_token);
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}
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}
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NotificationToken::NotificationToken(NotificationToken&&) = default;
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NotificationToken& NotificationToken::operator=(realm::NotificationToken&& rgt)
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{
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if (this != &rgt) {
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if (auto notifier = m_notifier.exchange({})) {
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notifier->remove_callback(m_token);
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}
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m_notifier = std::move(rgt.m_notifier);
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m_token = rgt.m_token;
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}
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return *this;
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}
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void NotificationToken::suppress_next()
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{
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m_notifier.load()->suppress_next_notification(m_token);
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}
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