193 lines
6.7 KiB
C#
193 lines
6.7 KiB
C#
/*
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*
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* (c) Copyright Ascensio System Limited 2010-2018
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*
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* This program is freeware. You can redistribute it and/or modify it under the terms of the GNU
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* General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html).
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* In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that
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* Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
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*
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* THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
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*
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* You can contact Ascensio System SIA by email at sales@onlyoffice.com
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*
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* The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display
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* Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
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*
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* Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains
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* relevant author attributions when distributing the software. If the display of the logo in its graphic
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* form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE"
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* in every copy of the program you distribute.
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* Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
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*
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*/
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using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Threading;
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using System.Threading.Tasks;
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using ASC.Common.Caching;
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namespace ASC.Common.Threading
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{
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public class DistributedTaskQueue
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{
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public static readonly string InstanseId;
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private readonly string key;
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private static readonly ICache cache;
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private readonly ICacheNotify<DistributedTaskCancelation> notify;
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private readonly ICacheNotify<DistributedTaskCache> notifyCache;
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private readonly TaskScheduler scheduler;
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private static readonly ConcurrentDictionary<string, CancellationTokenSource> cancelations = new ConcurrentDictionary<string, CancellationTokenSource>();
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static DistributedTaskQueue()
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{
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InstanseId = Process.GetCurrentProcess().Id.ToString();
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cache = AscCache.Memory;
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}
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/// <summary>
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/// Constructor
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/// </summary>
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/// <param name="name">Name of queue</param>
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/// <param name="maxThreadsCount">limit of threads count; Default: -1 - no limit</param>
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public DistributedTaskQueue(string name, int maxThreadsCount = -1)
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{
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if (string.IsNullOrEmpty(name))
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{
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throw new ArgumentNullException(nameof(name));
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}
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key = name + GetType().Name;
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scheduler = maxThreadsCount <= 0
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? TaskScheduler.Default
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: new LimitedConcurrencyLevelTaskScheduler(maxThreadsCount);
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notify = new KafkaCache<DistributedTaskCancelation>();
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notify.Subscribe((c) =>
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{
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if (cancelations.TryGetValue(c.Id, out var s))
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{
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s.Cancel();
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}
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}, CacheNotifyAction.Remove);
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notifyCache = new KafkaCache<DistributedTaskCache>();
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notifyCache.Subscribe((c) =>
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{
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cache.HashSet(key, c.Id, (DistributedTaskCache)null);
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}, CacheNotifyAction.Remove);
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notifyCache.Subscribe((c) =>
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{
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cache.HashSet(key, c.Id, c);
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}, CacheNotifyAction.InsertOrUpdate);
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}
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public void QueueTask(Action<DistributedTask, CancellationToken> action, DistributedTask distributedTask = null)
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{
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if (distributedTask == null)
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{
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distributedTask = new DistributedTask();
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}
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distributedTask.InstanseId = InstanseId;
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var cancelation = new CancellationTokenSource();
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var token = cancelation.Token;
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cancelations[distributedTask.Id] = cancelation;
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var task = new Task(() => action(distributedTask, token), token, TaskCreationOptions.LongRunning);
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task
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.ConfigureAwait(false)
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.GetAwaiter()
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.OnCompleted(() => OnCompleted(task, distributedTask.Id));
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distributedTask.Status = DistributedTaskStatus.Running;
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if (distributedTask.Publication == null)
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{
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distributedTask.Publication = GetPublication();
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}
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distributedTask.PublishChanges();
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task.Start(scheduler);
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}
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public void CancelTask(string id)
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{
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notify.Publish(new DistributedTaskCancelation() { Id = id }, CacheNotifyAction.Remove);
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}
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public IEnumerable<DistributedTask> GetTasks()
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{
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var tasks = new List<DistributedTask>(cache.HashGetAll<DistributedTask>(key).Values);
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tasks.ForEach(t =>
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{
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if (t.Publication == null)
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{
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t.Publication = GetPublication();
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}
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});
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return tasks;
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}
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public DistributedTask GetTask(string id)
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{
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var task = cache.HashGet<DistributedTask>(key, id);
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if (task != null && task.Publication == null)
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{
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task.Publication = GetPublication();
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}
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return task;
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}
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public void SetTask(DistributedTask task)
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{
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notifyCache.Publish(task.DistributedTaskCache, CacheNotifyAction.InsertOrUpdate);
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}
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public void RemoveTask(string id)
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{
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notifyCache.Publish(new DistributedTaskCache() { Id = id }, CacheNotifyAction.Remove);
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}
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private void OnCompleted(Task task, string id)
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{
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var distributedTask = GetTask(id);
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if (distributedTask != null)
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{
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distributedTask.Status = DistributedTaskStatus.Completed;
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distributedTask.Exception = task.Exception;
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if (task.IsFaulted)
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{
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distributedTask.Status = DistributedTaskStatus.Failted;
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}
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if (task.IsCanceled)
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{
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distributedTask.Status = DistributedTaskStatus.Canceled;
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}
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cancelations.TryRemove(id, out _);
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distributedTask.PublishChanges();
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}
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}
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private Action<DistributedTask> GetPublication()
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{
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return (t) => SetTask(t);
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}
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}
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}
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