295 lines
10 KiB
C#
295 lines
10 KiB
C#
using MediaBrowser.Common.Extensions;
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using MediaBrowser.Controller.Configuration;
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using MediaBrowser.Controller.Entities;
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using MediaBrowser.Model.Logging;
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using System;
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using System.Threading;
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using System.Threading.Tasks;
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namespace MediaBrowser.Controller.Providers
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{
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/// <summary>
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/// Class BaseMetadataProvider
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/// </summary>
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public abstract class BaseMetadataProvider
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{
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/// <summary>
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/// Gets the logger.
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/// </summary>
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/// <value>The logger.</value>
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protected ILogger Logger { get; set; }
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protected ILogManager LogManager { get; set; }
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/// <summary>
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/// Gets the configuration manager.
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/// </summary>
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/// <value>The configuration manager.</value>
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protected IServerConfigurationManager ConfigurationManager { get; private set; }
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/// <summary>
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/// The _id
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/// </summary>
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protected readonly Guid Id;
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protected static readonly SemaphoreSlim XmlParsingResourcePool = new SemaphoreSlim(5, 5);
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/// <summary>
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/// Supportses the specified item.
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/// </summary>
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/// <param name="item">The item.</param>
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/// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
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public abstract bool Supports(BaseItem item);
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/// <summary>
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/// Gets a value indicating whether [requires internet].
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/// </summary>
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/// <value><c>true</c> if [requires internet]; otherwise, <c>false</c>.</value>
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public virtual bool RequiresInternet
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{
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get
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{
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return false;
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}
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}
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/// <summary>
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/// Gets the provider version.
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/// </summary>
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/// <value>The provider version.</value>
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protected virtual string ProviderVersion
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{
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get
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{
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return null;
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}
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}
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/// <summary>
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/// Gets a value indicating whether [refresh on version change].
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/// </summary>
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/// <value><c>true</c> if [refresh on version change]; otherwise, <c>false</c>.</value>
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protected virtual bool RefreshOnVersionChange
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{
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get
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{
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return false;
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}
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}
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/// <summary>
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/// Determines if this provider is relatively slow and, therefore, should be skipped
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/// in certain instances. Default is whether or not it requires internet. Can be overridden
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/// for explicit designation.
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/// </summary>
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/// <value><c>true</c> if this instance is slow; otherwise, <c>false</c>.</value>
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public virtual bool IsSlow
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{
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get { return RequiresInternet; }
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="BaseMetadataProvider" /> class.
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/// </summary>
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protected BaseMetadataProvider(ILogManager logManager, IServerConfigurationManager configurationManager)
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{
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Logger = logManager.GetLogger(GetType().Name);
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LogManager = logManager;
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ConfigurationManager = configurationManager;
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Id = GetType().FullName.GetMD5();
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Initialize();
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}
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/// <summary>
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/// Initializes this instance.
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/// </summary>
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protected virtual void Initialize()
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{
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}
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/// <summary>
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/// Sets the persisted last refresh date on the item for this provider.
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/// </summary>
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/// <param name="item">The item.</param>
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/// <param name="value">The value.</param>
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/// <param name="providerVersion">The provider version.</param>
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/// <param name="status">The status.</param>
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/// <exception cref="System.ArgumentNullException">item</exception>
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public virtual void SetLastRefreshed(BaseItem item, DateTime value, string providerVersion, ProviderRefreshStatus status = ProviderRefreshStatus.Success)
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{
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if (item == null)
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{
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throw new ArgumentNullException("item");
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}
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BaseProviderInfo data;
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if (!item.ProviderData.TryGetValue(Id, out data))
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{
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data = new BaseProviderInfo();
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}
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data.LastRefreshed = value;
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data.LastRefreshStatus = status;
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data.ProviderVersion = providerVersion;
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// Save the file system stamp for future comparisons
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if (RefreshOnFileSystemStampChange)
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{
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data.FileSystemStamp = GetCurrentFileSystemStamp(item);
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}
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item.ProviderData[Id] = data;
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}
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/// <summary>
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/// Sets the last refreshed.
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/// </summary>
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/// <param name="item">The item.</param>
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/// <param name="value">The value.</param>
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/// <param name="status">The status.</param>
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public void SetLastRefreshed(BaseItem item, DateTime value, ProviderRefreshStatus status = ProviderRefreshStatus.Success)
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{
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SetLastRefreshed(item, value, ProviderVersion, status);
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}
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/// <summary>
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/// Returns whether or not this provider should be re-fetched. Default functionality can
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/// compare a provided date with a last refresh time. This can be overridden for more complex
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/// determinations.
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/// </summary>
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/// <param name="item">The item.</param>
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/// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
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/// <exception cref="System.ArgumentNullException"></exception>
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public bool NeedsRefresh(BaseItem item)
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{
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if (item == null)
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{
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throw new ArgumentNullException();
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}
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BaseProviderInfo data;
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if (!item.ProviderData.TryGetValue(Id, out data))
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{
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data = new BaseProviderInfo();
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}
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return NeedsRefreshInternal(item, data);
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}
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/// <summary>
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/// Needses the refresh internal.
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/// </summary>
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/// <param name="item">The item.</param>
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/// <param name="providerInfo">The provider info.</param>
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/// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
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/// <exception cref="System.ArgumentNullException"></exception>
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protected virtual bool NeedsRefreshInternal(BaseItem item, BaseProviderInfo providerInfo)
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{
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if (item == null)
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{
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throw new ArgumentNullException("item");
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}
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if (providerInfo == null)
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{
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throw new ArgumentNullException("providerInfo");
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}
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if (CompareDate(item) > providerInfo.LastRefreshed)
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{
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return true;
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}
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if (RefreshOnFileSystemStampChange && HasFileSystemStampChanged(item, providerInfo))
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{
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return true;
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}
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if (RefreshOnVersionChange && !string.Equals(ProviderVersion, providerInfo.ProviderVersion))
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{
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return true;
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}
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return false;
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}
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/// <summary>
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/// Determines if the item's file system stamp has changed from the last time the provider refreshed
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/// </summary>
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/// <param name="item">The item.</param>
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/// <param name="providerInfo">The provider info.</param>
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/// <returns><c>true</c> if [has file system stamp changed] [the specified item]; otherwise, <c>false</c>.</returns>
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protected bool HasFileSystemStampChanged(BaseItem item, BaseProviderInfo providerInfo)
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{
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return !string.Equals(GetCurrentFileSystemStamp(item), providerInfo.FileSystemStamp);
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}
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/// <summary>
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/// Override this to return the date that should be compared to the last refresh date
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/// to determine if this provider should be re-fetched.
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/// </summary>
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/// <param name="item">The item.</param>
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/// <returns>DateTime.</returns>
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protected virtual DateTime CompareDate(BaseItem item)
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{
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return DateTime.MinValue.AddMinutes(1); // want this to be greater than mindate so new items will refresh
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}
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/// <summary>
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/// Fetches metadata and returns true or false indicating if any work that requires persistence was done
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/// </summary>
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/// <param name="item">The item.</param>
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/// <param name="force">if set to <c>true</c> [force].</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>Task{System.Boolean}.</returns>
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/// <exception cref="System.ArgumentNullException"></exception>
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public abstract Task<bool> FetchAsync(BaseItem item, bool force, CancellationToken cancellationToken);
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/// <summary>
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/// Gets the priority.
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/// </summary>
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/// <value>The priority.</value>
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public abstract MetadataProviderPriority Priority { get; }
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/// <summary>
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/// Returns true or false indicating if the provider should refresh when the contents of it's directory changes
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/// </summary>
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/// <value><c>true</c> if [refresh on file system stamp change]; otherwise, <c>false</c>.</value>
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protected virtual bool RefreshOnFileSystemStampChange
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{
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get
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{
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return false;
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}
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}
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/// <summary>
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/// Determines if the parent's file system stamp should be used for comparison
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/// </summary>
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/// <param name="item">The item.</param>
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/// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
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protected virtual bool UseParentFileSystemStamp(BaseItem item)
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{
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// True when the current item is just a file
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return !item.ResolveArgs.IsDirectory;
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}
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/// <summary>
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/// Gets the item's current file system stamp
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/// </summary>
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/// <param name="item">The item.</param>
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/// <returns>Guid.</returns>
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private string GetCurrentFileSystemStamp(BaseItem item)
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{
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if (UseParentFileSystemStamp(item) && item.Parent != null)
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{
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return item.Parent.FileSystemStamp;
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}
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return item.FileSystemStamp;
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}
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}
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}
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