mirror of https://gitee.com/bigwinds/arangodb
108 lines
2.3 KiB
C++
108 lines
2.3 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 Dr. Frank Celler
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_SCHEDULER_JOB_QUEUE_H
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#define ARANGOD_SCHEDULER_JOB_QUEUE_H 1
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#include "Basics/Common.h"
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#include <boost/lockfree/queue.hpp>
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#include "Basics/ConditionVariable.h"
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#include "Basics/Thread.h"
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#include "Scheduler/Job.h"
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namespace arangodb {
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namespace rest {
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class Scheduler;
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}
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class JobQueueThread;
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class JobQueue {
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friend class JobQueueThread;
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public:
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// ordered by priority (highst prio first)
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static size_t const AQL_QUEUE = 1;
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static size_t const STANDARD_QUEUE = 2;
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static size_t const BACKGROUND_QUEUE = 3;
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public:
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JobQueue(size_t maxQueueSize, rest::Scheduler*);
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public:
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void start();
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void beginShutdown();
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int64_t queueSize() const { return _queueSize; }
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bool queue(std::unique_ptr<Job> job) {
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try {
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if (0 < _maxQueueSize && _maxQueueSize <= _queueSize) {
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wakeup();
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return false;
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}
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if (!_queue.push(job.get())) {
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wakeup();
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return false;
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}
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job.release();
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++_queueSize;
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} catch (...) {
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wakeup();
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return false;
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}
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wakeup();
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return true;
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}
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private:
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bool pop(Job*& job) {
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bool ok = _queue.pop(job) && job != nullptr;
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if (ok) {
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--_queueSize;
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}
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return ok;
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}
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void wakeup();
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void waitForWork();
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private:
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int64_t const _maxQueueSize;
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boost::lockfree::queue<Job*> _queue;
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std::atomic<int64_t> _queueSize;
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basics::ConditionVariable _queueCondition;
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std::shared_ptr<JobQueueThread> _queueThread;
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};
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}
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#endif
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