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using System;
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using System.Linq;
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using System.Threading.Tasks;
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using System.Threading;
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using NLog;
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using NzbDrone.Common;
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using NzbDrone.Common.EnsureThat;
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using NzbDrone.Common.Serializer;
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using NzbDrone.Common.TPL;
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using NzbDrone.Core.Messaging.Commands.Tracking;
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using NzbDrone.Core.Lifecycle;
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using NzbDrone.Core.Messaging.Events;
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using NzbDrone.Core.ProgressMessaging;
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namespace NzbDrone.Core.Messaging.Commands
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{
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public class CommandExecutor : ICommandExecutor
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public class CommandExecutor : IHandle<ApplicationStartedEvent>,
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IHandle<ApplicationShutdownRequested>
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{
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private readonly Logger _logger;
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private readonly IServiceFactory _serviceFactory;
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private readonly ITrackCommands _trackCommands;
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private readonly IManageCommandQueue _commandQueueManager;
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private readonly IEventAggregator _eventAggregator;
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private readonly TaskFactory _taskFactory;
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public CommandExecutor(Logger logger, IServiceFactory serviceFactory, ITrackCommands trackCommands, IEventAggregator eventAggregator)
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{
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var scheduler = new LimitedConcurrencyLevelTaskScheduler(3);
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private static CancellationTokenSource _cancellationTokenSource;
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private const int THREAD_LIMIT = 3;
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public CommandExecutor(IServiceFactory serviceFactory,
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IManageCommandQueue commandQueueManager,
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IEventAggregator eventAggregator,
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Logger logger)
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{
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_logger = logger;
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_serviceFactory = serviceFactory;
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_trackCommands = trackCommands;
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_commandQueueManager = commandQueueManager;
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_eventAggregator = eventAggregator;
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_taskFactory = new TaskFactory(scheduler);
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}
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public void PublishCommand<TCommand>(TCommand command) where TCommand : Command
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{
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Ensure.That(command, () => command).IsNotNull();
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_logger.Trace("Publishing {0}", command.GetType().Name);
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if (_trackCommands.FindExisting(command) != null)
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{
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_logger.Trace("Command is already in progress: {0}", command.GetType().Name);
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return;
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}
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_trackCommands.Store(command);
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ExecuteCommand<TCommand>(command);
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}
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public void PublishCommand(string commandTypeName)
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{
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PublishCommand(commandTypeName, null);
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}
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public void PublishCommand(string commandTypeName, DateTime? lastExecutionTime)
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private void ExecuteCommands()
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{
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dynamic command = GetCommand(commandTypeName);
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command.LastExecutionTime = lastExecutionTime;
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PublishCommand(command);
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}
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public Command PublishCommandAsync<TCommand>(TCommand command) where TCommand : Command
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{
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Ensure.That(command, () => command).IsNotNull();
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_logger.Trace("Publishing {0}", command.GetType().Name);
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var existingCommand = _trackCommands.FindExisting(command);
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if (existingCommand != null)
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{
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_logger.Trace("Command is already in progress: {0}", command.GetType().Name);
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return existingCommand;
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}
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_trackCommands.Store(command);
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// TODO: We should use async await (once we get 4.5) or normal Task Continuations on Command processing to prevent blocking the TaskScheduler.
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// For now we use TaskCreationOptions 0x10, which is actually .net 4.5 HideScheduler.
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// This will detach the scheduler from the thread, causing new Task creating in the command to be executed on the ThreadPool, avoiding a deadlock.
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// Please note that the issue only shows itself on mono because since Microsoft .net implementation supports Task inlining on WaitAll.
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if (Enum.IsDefined(typeof(TaskCreationOptions), (TaskCreationOptions)0x10))
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try
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{
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_taskFactory.StartNew(() => ExecuteCommand<TCommand>(command)
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, TaskCreationOptions.PreferFairness | (TaskCreationOptions)0x10)
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.LogExceptions();
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foreach (var command in _commandQueueManager.Queue(_cancellationTokenSource.Token))
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{
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try
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{
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ExecuteCommand((dynamic)command.Body, command);
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error occurred while executing task " + command.Name, ex);
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}
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}
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}
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else
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catch (ThreadAbortException ex)
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{
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_taskFactory.StartNew(() => ExecuteCommand<TCommand>(command)
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, TaskCreationOptions.PreferFairness)
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.LogExceptions();
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_logger.ErrorException(ex.Message, ex);
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Thread.ResetAbort();
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}
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return command;
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}
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public Command PublishCommandAsync(string commandTypeName)
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{
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dynamic command = GetCommand(commandTypeName);
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return PublishCommandAsync(command);
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}
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private dynamic GetCommand(string commandTypeName)
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{
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var commandType = _serviceFactory.GetImplementations(typeof(Command))
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.Single(c => c.FullName.Equals(commandTypeName, StringComparison.InvariantCultureIgnoreCase));
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return Json.Deserialize("{}", commandType);
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}
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private void ExecuteCommand<TCommand>(Command command) where TCommand : Command
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private void ExecuteCommand<TCommand>(TCommand command, CommandModel commandModel) where TCommand : Command
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{
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var handlerContract = typeof(IExecute<>).MakeGenericType(command.GetType());
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var handler = (IExecute<TCommand>)_serviceFactory.Build(handlerContract);
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@ -120,47 +62,67 @@ namespace NzbDrone.Core.Messaging.Commands
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try
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{
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_trackCommands.Start(command);
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BroadcastCommandUpdate(command);
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_commandQueueManager.Start(commandModel);
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BroadcastCommandUpdate(commandModel);
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if (!MappedDiagnosticsContext.Contains("CommandId") && command.SendUpdatesToClient)
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if (!MappedDiagnosticsContext.Contains("CommandId"))
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{
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MappedDiagnosticsContext.Set("CommandId", command.Id.ToString());
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MappedDiagnosticsContext.Set("CommandId", commandModel.Id.ToString());
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}
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handler.Execute((TCommand)command);
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handler.Execute(command);
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if (command.State == CommandStatus.Running)
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{
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_trackCommands.Completed(command);
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}
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_commandQueueManager.Complete(commandModel, command.CompletionMessage);
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}
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catch (CommandFailedException ex)
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{
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_commandQueueManager.Fail(commandModel, ex.Message, ex);
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throw;
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}
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catch (Exception e)
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catch (Exception ex)
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{
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_trackCommands.Failed(command, e);
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_commandQueueManager.SetMessage(commandModel, "Failed");
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_commandQueueManager.Fail(commandModel, "Failed", ex);
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throw;
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}
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finally
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{
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BroadcastCommandUpdate(command);
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_eventAggregator.PublishEvent(new CommandExecutedEvent(command));
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BroadcastCommandUpdate(commandModel);
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_eventAggregator.PublishEvent(new CommandExecutedEvent(commandModel));
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if (MappedDiagnosticsContext.Get("CommandId") == command.Id.ToString())
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if (MappedDiagnosticsContext.Get("CommandId") == commandModel.Id.ToString())
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{
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MappedDiagnosticsContext.Remove("CommandId");
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}
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}
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_logger.Trace("{0} <- {1} [{2}]", command.GetType().Name, handler.GetType().Name, command.Runtime.ToString(""));
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_logger.Trace("{0} <- {1} [{2}]", command.GetType().Name, handler.GetType().Name, commandModel.Duration.ToString());
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}
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private void BroadcastCommandUpdate(Command command)
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private void BroadcastCommandUpdate(CommandModel command)
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{
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if (command.SendUpdatesToClient)
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if (command.Body.SendUpdatesToClient)
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{
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_eventAggregator.PublishEvent(new CommandUpdatedEvent(command));
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}
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}
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public void Handle(ApplicationStartedEvent message)
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{
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_cancellationTokenSource = new CancellationTokenSource();
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for (int i = 0; i < THREAD_LIMIT; i++)
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{
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var thread = new Thread(ExecuteCommands);
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thread.Start();
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}
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}
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public void Handle(ApplicationShutdownRequested message)
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{
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_logger.Info("Shutting down task execution");
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_cancellationTokenSource.Cancel(true);
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}
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}
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}
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Mark McDowall
10 years ago