mirror of https://gitee.com/bigwinds/arangodb
95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2016 ArangoDB GmbH, Cologne, Germany
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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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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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/// @author Andrey Abramov
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_REST_SERVER_FLUSH_FEATURE_H
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#define ARANGODB_REST_SERVER_FLUSH_FEATURE_H 1
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#include "ApplicationFeatures/ApplicationFeature.h"
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#include "Basics/ReadWriteLock.h"
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#include "VocBase/voc-types.h"
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#include <list>
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struct TRI_vocbase_t;
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namespace arangodb {
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class FlushThread;
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//////////////////////////////////////////////////////////////////////////////
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/// @struct FlushSubscription
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/// @brief subscription is intenteded to notify FlushFeature
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/// on the WAL tick which can be safely released
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//////////////////////////////////////////////////////////////////////////////
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struct FlushSubscription {
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virtual ~FlushSubscription() = default;
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virtual TRI_voc_tick_t tick() const = 0;
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};
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class FlushFeature final : public application_features::ApplicationFeature {
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public:
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/// @brief handle a 'Flush' marker during recovery
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/// @param vocbase the vocbase the marker applies to
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/// @param slice the originally stored marker body
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/// @return success
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typedef std::function<Result(TRI_vocbase_t const& vocbase, velocypack::Slice const& slice)> FlushRecoveryCallback;
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explicit FlushFeature(application_features::ApplicationServer& server);
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void collectOptions(std::shared_ptr<options::ProgramOptions> options) override;
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/// @brief register a flush subscription that will ensure replay of all WAL
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/// entries after the latter of registration or the last successful
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/// token commit
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/// @param subscription to register
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void registerFlushSubscription(const std::shared_ptr<FlushSubscription>& subscription);
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/// @brief release all ticks not used by the flush subscriptions
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/// @param 'count' a number of released subscriptions
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/// @param 'tick' released tick
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arangodb::Result releaseUnusedTicks(size_t& count, TRI_voc_tick_t& tick);
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void validateOptions(std::shared_ptr<options::ProgramOptions>) override;
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void prepare() override;
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void start() override;
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void beginShutdown() override;
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void stop() override;
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void unprepare() override { }
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static bool isRunning() { return _isRunning.load(); }
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private:
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static std::atomic<bool> _isRunning;
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uint64_t _flushInterval;
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std::unique_ptr<FlushThread> _flushThread;
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basics::ReadWriteLock _threadLock;
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std::list<std::weak_ptr<FlushSubscription>> _flushSubscriptions;
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std::mutex _flushSubscriptionsMutex;
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bool _stopped;
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};
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} // namespace arangodb
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#endif
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