More DI

MediaBrowser.Common.Implementations/ScheduledTasks/TaskManager.cs

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+using MediaBrowser.Common.Kernel;
+using MediaBrowser.Common.ScheduledTasks;
+using MediaBrowser.Model.Logging;
+using MediaBrowser.Model.Serialization;
+using MediaBrowser.Model.Tasks;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+
+namespace MediaBrowser.Common.Implementations.ScheduledTasks
+{
+    /// <summary>
+    /// Class TaskManager
+    /// </summary>
+    public class TaskManager : ITaskManager
+    {
+        /// <summary>
+        /// Gets the list of Scheduled Tasks
+        /// </summary>
+        /// <value>The scheduled tasks.</value>
+        public IScheduledTask[] ScheduledTasks { get; private set; }
+
+        /// <summary>
+        /// The _task queue
+        /// </summary>
+        private readonly List<Type> _taskQueue = new List<Type>();
+
+        /// <summary>
+        /// The _logger
+        /// </summary>
+        private readonly ILogger _logger;
+
+        /// <summary>
+        /// The _application paths
+        /// </summary>
+        private readonly IApplicationPaths _applicationPaths;
+
+        /// <summary>
+        /// The _json serializer
+        /// </summary>
+        private readonly IJsonSerializer _jsonSerializer;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="TaskManager" /> class.
+        /// </summary>
+        /// <param name="applicationPaths">The application paths.</param>
+        /// <param name="jsonSerializer">The json serializer.</param>
+        /// <param name="logger">The logger.</param>
+        /// <exception cref="System.ArgumentException">kernel</exception>
+        public TaskManager(IApplicationPaths applicationPaths, IJsonSerializer jsonSerializer, ILogger logger)
+        {
+            if (applicationPaths == null)
+            {
+                throw new ArgumentException("applicationPaths");
+            }
+            if (jsonSerializer == null)
+            {
+                throw new ArgumentException("jsonSerializer");
+            }
+            if (logger == null)
+            {
+                throw new ArgumentException("logger");
+            }
+
+            _applicationPaths = applicationPaths;
+            _jsonSerializer = jsonSerializer;
+            _logger = logger;
+
+            ScheduledTasks = new IScheduledTask[] {};
+        }
+
+        /// <summary>
+        /// Cancels if running and queue.
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        public void CancelIfRunningAndQueue<T>()
+                 where T : IScheduledTask
+        {
+            ScheduledTasks.OfType<T>().First().CancelIfRunning();
+            QueueScheduledTask<T>();
+        }
+
+        /// <summary>
+        /// Queues the scheduled task.
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        public void QueueScheduledTask<T>()
+            where T : IScheduledTask
+        {
+            var scheduledTask = ScheduledTasks.OfType<T>().First();
+
+            QueueScheduledTask(scheduledTask);
+        }
+
+        /// <summary>
+        /// Queues the scheduled task.
+        /// </summary>
+        /// <param name="task">The task.</param>
+        public void QueueScheduledTask(IScheduledTask task)
+        {
+            var type = task.GetType();
+
+            var scheduledTask = ScheduledTasks.First(t => t.GetType() == type);
+
+            lock (_taskQueue)
+            {
+                // If it's idle just execute immediately
+                if (scheduledTask.State == TaskState.Idle)
+                {
+                    scheduledTask.Execute();
+                    return;
+                }
+
+                if (!_taskQueue.Contains(type))
+                {
+                    _logger.Info("Queueing task {0}", type.Name);
+                    _taskQueue.Add(type);
+                }
+                else
+                {
+                    _logger.Info("Task already queued: {0}", type.Name);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Called when [task completed].
+        /// </summary>
+        /// <param name="task">The task.</param>
+        public void OnTaskCompleted(IScheduledTask task)
+        {
+            // Execute queued tasks
+            lock (_taskQueue)
+            {
+                var copy = _taskQueue.ToList();
+
+                foreach (var type in copy)
+                {
+                    var scheduledTask = ScheduledTasks.First(t => t.GetType() == type);
+
+                    if (scheduledTask.State == TaskState.Idle)
+                    {
+                        scheduledTask.Execute();
+
+                        _taskQueue.Remove(type);
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Adds the tasks.
+        /// </summary>
+        /// <param name="tasks">The tasks.</param>
+        public void AddTasks(IEnumerable<IScheduledTask> tasks)
+        {
+            var myTasks = ScheduledTasks.ToList();
+
+            myTasks.AddRange(tasks);
+
+            ScheduledTasks = myTasks.ToArray();
+        }
+
+        /// <summary>
+        /// The _scheduled tasks configuration directory
+        /// </summary>
+        private string _scheduledTasksConfigurationDirectory;
+        /// <summary>
+        /// Gets the scheduled tasks configuration directory.
+        /// </summary>
+        /// <value>The scheduled tasks configuration directory.</value>
+        private string ScheduledTasksConfigurationDirectory
+        {
+            get
+            {
+                if (_scheduledTasksConfigurationDirectory == null)
+                {
+                    _scheduledTasksConfigurationDirectory = Path.Combine(_applicationPaths.ConfigurationDirectoryPath, "ScheduledTasks");
+
+                    if (!Directory.Exists(_scheduledTasksConfigurationDirectory))
+                    {
+                        Directory.CreateDirectory(_scheduledTasksConfigurationDirectory);
+                    }
+                }
+                return _scheduledTasksConfigurationDirectory;
+            }
+        }
+
+        /// <summary>
+        /// The _scheduled tasks data directory
+        /// </summary>
+        private string _scheduledTasksDataDirectory;
+        /// <summary>
+        /// Gets the scheduled tasks data directory.
+        /// </summary>
+        /// <value>The scheduled tasks data directory.</value>
+        private string ScheduledTasksDataDirectory
+        {
+            get
+            {
+                if (_scheduledTasksDataDirectory == null)
+                {
+                    _scheduledTasksDataDirectory = Path.Combine(_applicationPaths.DataPath, "ScheduledTasks");
+
+                    if (!Directory.Exists(_scheduledTasksDataDirectory))
+                    {
+                        Directory.CreateDirectory(_scheduledTasksDataDirectory);
+                    }
+                }
+                return _scheduledTasksDataDirectory;
+            }
+        }
+
+        /// <summary>
+        /// Gets the history file path.
+        /// </summary>
+        /// <value>The history file path.</value>
+        private string GetHistoryFilePath(IScheduledTask task)
+        {
+            return Path.Combine(ScheduledTasksDataDirectory, task.Id + ".js");
+        }
+
+        /// <summary>
+        /// Gets the configuration file path.
+        /// </summary>
+        /// <param name="task">The task.</param>
+        /// <returns>System.String.</returns>
+        private string GetConfigurationFilePath(IScheduledTask task)
+        {
+            return Path.Combine(ScheduledTasksConfigurationDirectory, task.Id + ".js");
+        }
+
+        /// <summary>
+        /// Called when [task completed].
+        /// </summary>
+        /// <param name="task">The task.</param>
+        /// <param name="startTime">The start time.</param>
+        /// <param name="endTime">The end time.</param>
+        /// <param name="status">The status.</param>
+        public void OnTaskCompleted(IScheduledTask task, DateTime startTime, DateTime endTime, TaskCompletionStatus status)
+        {
+            var elapsedTime = endTime - startTime;
+
+            _logger.Info("{0} {1} after {2} minute(s) and {3} seconds", task.Name, status, Math.Truncate(elapsedTime.TotalMinutes), elapsedTime.Seconds);
+
+            var result = new TaskResult
+            {
+                StartTimeUtc = startTime,
+                EndTimeUtc = endTime,
+                Status = status,
+                Name = task.Name,
+                Id = task.Id
+            };
+
+            _jsonSerializer.SerializeToFile(result, GetHistoryFilePath(task));
+
+            //task.LastExecutionResult = result;
+        }
+
+        /// <summary>
+        /// Gets the last execution result.
+        /// </summary>
+        /// <param name="task">The task.</param>
+        /// <returns>TaskResult.</returns>
+        public TaskResult GetLastExecutionResult(IScheduledTask task)
+        {
+            return _jsonSerializer.DeserializeFromFile<TaskResult>(GetHistoryFilePath(task));
+        }
+
+        /// <summary>
+        /// Loads the triggers.
+        /// </summary>
+        /// <param name="task">The task.</param>
+        /// <returns>IEnumerable{BaseTaskTrigger}.</returns>
+        public IEnumerable<ITaskTrigger> LoadTriggers(IScheduledTask task)
+        {
+            try
+            {
+                return _jsonSerializer.DeserializeFromFile<IEnumerable<TaskTriggerInfo>>(GetConfigurationFilePath(task))
+                .Select(ScheduledTaskHelpers.GetTrigger)
+                .ToList();
+            }
+            catch (IOException)
+            {
+                // File doesn't exist. No biggie. Return defaults.
+                return task.GetDefaultTriggers();
+            }
+        }
+
+        /// <summary>
+        /// Saves the triggers.
+        /// </summary>
+        /// <param name="task">The task.</param>
+        /// <param name="triggers">The triggers.</param>
+        public void SaveTriggers(IScheduledTask task, IEnumerable<ITaskTrigger> triggers)
+        {
+            _jsonSerializer.SerializeToFile(triggers.Select(ScheduledTaskHelpers.GetTriggerInfo), GetConfigurationFilePath(task));
+        }
+
+        /// <summary>
+        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
+        /// </summary>
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        /// <summary>
+        /// Releases unmanaged and - optionally - managed resources.
+        /// </summary>
+        /// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
+        protected virtual void Dispose(bool dispose)
+        {
+            foreach (var task in ScheduledTasks)
+            {
+                task.Dispose();
+            }
+        }
+    }
+}