905 lines
34 KiB
C#
905 lines
34 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Text;
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using System.Threading;
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using Microsoft.Extensions.Logging;
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using Umbraco.Extensions;
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using Umbraco.Cms.Core.Cache;
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using Umbraco.Cms.Core.Events;
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using Umbraco.Cms.Core.IO;
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using Umbraco.Cms.Infrastructure.Persistence;
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using CoreDebugSettings = Umbraco.Cms.Core.Configuration.Models.CoreDebugSettings;
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namespace Umbraco.Cms.Core.Scoping
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{
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/// <summary>
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/// Implements <see cref="IScope"/>.
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/// </summary>
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/// <remarks>Not thread-safe obviously.</remarks>
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internal class Scope : IScope
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{
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private readonly ScopeProvider _scopeProvider;
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private readonly CoreDebugSettings _coreDebugSettings;
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private readonly MediaFileManager _mediaFileManager;
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private readonly IEventAggregator _eventAggregator;
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private readonly ILogger<Scope> _logger;
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private readonly IsolationLevel _isolationLevel;
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private readonly RepositoryCacheMode _repositoryCacheMode;
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private readonly bool? _scopeFileSystem;
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private readonly bool _autoComplete;
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private bool _callContext;
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private bool _disposed;
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private bool? _completed;
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private IsolatedCaches _isolatedCaches;
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private IUmbracoDatabase _database;
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private EventMessages _messages;
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private ICompletable _fscope;
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private IEventDispatcher _eventDispatcher;
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private IScopedNotificationPublisher _notificationPublisher;
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private readonly object _dictionaryLocker;
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private HashSet<int> _readLocks;
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private HashSet<int> _writeLocks;
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private Dictionary<Guid, Dictionary<int, int>> _readLockDictionary;
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private Dictionary<Guid, Dictionary<int, int>> _writeLockDictionary;
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internal Dictionary<Guid, Dictionary<int, int>> ReadLocks => _readLockDictionary;
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internal Dictionary<Guid, Dictionary<int, int>> WriteLocks => _writeLockDictionary;
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// initializes a new scope
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private Scope(
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ScopeProvider scopeProvider,
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CoreDebugSettings coreDebugSettings,
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MediaFileManager mediaFileManager,
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IEventAggregator eventAggregator,
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ILogger<Scope> logger,
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FileSystems fileSystems,
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Scope parent,
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IScopeContext scopeContext,
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bool detachable,
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IsolationLevel isolationLevel = IsolationLevel.Unspecified,
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RepositoryCacheMode repositoryCacheMode = RepositoryCacheMode.Unspecified,
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IEventDispatcher eventDispatcher = null,
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IScopedNotificationPublisher notificationPublisher = null,
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bool? scopeFileSystems = null,
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bool callContext = false,
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bool autoComplete = false)
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{
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_scopeProvider = scopeProvider;
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_coreDebugSettings = coreDebugSettings;
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_mediaFileManager = mediaFileManager;
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_eventAggregator = eventAggregator;
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_logger = logger;
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Context = scopeContext;
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_isolationLevel = isolationLevel;
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_repositoryCacheMode = repositoryCacheMode;
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_eventDispatcher = eventDispatcher;
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_notificationPublisher = notificationPublisher;
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_scopeFileSystem = scopeFileSystems;
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_callContext = callContext;
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_autoComplete = autoComplete;
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Detachable = detachable;
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_dictionaryLocker = new object();
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#if DEBUG_SCOPES
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_scopeProvider.RegisterScope(this);
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#endif
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logger.LogTrace("Create {InstanceId} on thread {ThreadId}", InstanceId.ToString("N").Substring(0, 8), Thread.CurrentThread.ManagedThreadId);
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if (detachable)
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{
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if (parent != null)
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{
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throw new ArgumentException("Cannot set parent on detachable scope.", nameof(parent));
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}
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if (scopeContext != null)
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{
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throw new ArgumentException("Cannot set context on detachable scope.", nameof(scopeContext));
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}
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if (autoComplete)
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{
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throw new ArgumentException("Cannot auto-complete a detachable scope.", nameof(autoComplete));
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}
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// detachable creates its own scope context
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Context = new ScopeContext();
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// see note below
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if (scopeFileSystems == true)
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{
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_fscope = fileSystems.Shadow();
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}
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return;
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}
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if (parent != null)
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{
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ParentScope = parent;
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// cannot specify a different mode!
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// TODO: means that it's OK to go from L2 to None for reading purposes, but writing would be BAD!
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// this is for XmlStore that wants to bypass caches when rebuilding XML (same for NuCache)
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if (repositoryCacheMode != RepositoryCacheMode.Unspecified && parent.RepositoryCacheMode > repositoryCacheMode)
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{
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throw new ArgumentException($"Value '{repositoryCacheMode}' cannot be lower than parent value '{parent.RepositoryCacheMode}'.", nameof(repositoryCacheMode));
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}
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// cannot specify a dispatcher!
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if (_eventDispatcher != null)
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{
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throw new ArgumentException("Value cannot be specified on nested scope.", nameof(eventDispatcher));
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}
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// Only the outermost scope can specify the notification publisher
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if (_notificationPublisher != null)
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{
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throw new ArgumentException("Value cannot be specified on nested scope.", nameof(notificationPublisher));
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}
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// cannot specify a different fs scope!
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// can be 'true' only on outer scope (and false does not make much sense)
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if (scopeFileSystems != null && parent._scopeFileSystem != scopeFileSystems)
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{
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throw new ArgumentException($"Value '{scopeFileSystems.Value}' be different from parent value '{parent._scopeFileSystem}'.", nameof(scopeFileSystems));
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}
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}
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else
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{
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// the FS scope cannot be "on demand" like the rest, because we would need to hook into
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// every scoped FS to trigger the creation of shadow FS "on demand", and that would be
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// pretty pointless since if scopeFileSystems is true, we *know* we want to shadow
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if (scopeFileSystems == true)
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{
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_fscope = fileSystems.Shadow();
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}
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}
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}
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// initializes a new scope
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public Scope(
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ScopeProvider scopeProvider,
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CoreDebugSettings coreDebugSettings,
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MediaFileManager mediaFileManager,
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IEventAggregator eventAggregator,
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ILogger<Scope> logger,
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FileSystems fileSystems,
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bool detachable,
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IScopeContext scopeContext,
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IsolationLevel isolationLevel = IsolationLevel.Unspecified,
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RepositoryCacheMode repositoryCacheMode = RepositoryCacheMode.Unspecified,
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IEventDispatcher eventDispatcher = null,
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IScopedNotificationPublisher scopedNotificationPublisher = null,
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bool? scopeFileSystems = null,
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bool callContext = false,
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bool autoComplete = false)
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: this(scopeProvider, coreDebugSettings, mediaFileManager, eventAggregator, logger, fileSystems, null, scopeContext, detachable, isolationLevel, repositoryCacheMode, eventDispatcher, scopedNotificationPublisher, scopeFileSystems, callContext, autoComplete)
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{ }
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// initializes a new scope in a nested scopes chain, with its parent
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public Scope(
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ScopeProvider scopeProvider,
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CoreDebugSettings coreDebugSettings,
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MediaFileManager mediaFileManager,
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IEventAggregator eventAggregator,
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ILogger<Scope> logger,
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FileSystems fileSystems,
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Scope parent,
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IsolationLevel isolationLevel = IsolationLevel.Unspecified,
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RepositoryCacheMode repositoryCacheMode = RepositoryCacheMode.Unspecified,
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IEventDispatcher eventDispatcher = null,
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IScopedNotificationPublisher notificationPublisher = null,
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bool? scopeFileSystems = null,
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bool callContext = false,
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bool autoComplete = false)
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: this(scopeProvider, coreDebugSettings, mediaFileManager, eventAggregator, logger, fileSystems, parent, null, false, isolationLevel, repositoryCacheMode, eventDispatcher, notificationPublisher, scopeFileSystems, callContext, autoComplete)
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{ }
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public Guid InstanceId { get; } = Guid.NewGuid();
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public int CreatedThreadId { get; } = Thread.CurrentThread.ManagedThreadId;
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public ISqlContext SqlContext => _scopeProvider.SqlContext;
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// a value indicating whether to force call-context
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public bool CallContext
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{
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get
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{
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if (_callContext)
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{
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return true;
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}
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if (ParentScope != null)
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{
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return ParentScope.CallContext;
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}
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return false;
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}
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set => _callContext = value;
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}
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public bool ScopedFileSystems
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{
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get
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{
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if (ParentScope != null)
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{
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return ParentScope.ScopedFileSystems;
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}
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return _fscope != null;
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}
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}
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/// <inheritdoc />
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public RepositoryCacheMode RepositoryCacheMode
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{
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get
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{
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if (_repositoryCacheMode != RepositoryCacheMode.Unspecified)
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{
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return _repositoryCacheMode;
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}
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if (ParentScope != null)
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{
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return ParentScope.RepositoryCacheMode;
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}
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return RepositoryCacheMode.Default;
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}
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}
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/// <inheritdoc />
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public IsolatedCaches IsolatedCaches
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{
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get
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{
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if (ParentScope != null)
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{
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return ParentScope.IsolatedCaches;
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}
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return _isolatedCaches ??= new IsolatedCaches(type => new DeepCloneAppCache(new ObjectCacheAppCache()));
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}
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}
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// a value indicating whether the scope is detachable
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// ie whether it was created by CreateDetachedScope
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public bool Detachable { get; }
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// the parent scope (in a nested scopes chain)
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public Scope ParentScope { get; set; }
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public bool Attached { get; set; }
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// the original scope (when attaching a detachable scope)
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public Scope OrigScope { get; set; }
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// the original context (when attaching a detachable scope)
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public IScopeContext OrigContext { get; set; }
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// the context (for attaching & detaching only)
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public IScopeContext Context { get; }
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public IsolationLevel IsolationLevel
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{
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get
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{
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if (_isolationLevel != IsolationLevel.Unspecified)
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{
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return _isolationLevel;
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}
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if (ParentScope != null)
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{
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return ParentScope.IsolationLevel;
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}
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return Database.SqlContext.SqlSyntax.DefaultIsolationLevel;
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}
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}
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/// <inheritdoc />
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public IUmbracoDatabase Database
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{
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get
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{
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EnsureNotDisposed();
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if (_database != null)
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{
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return _database;
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}
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if (ParentScope != null)
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{
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IUmbracoDatabase database = ParentScope.Database;
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IsolationLevel currentLevel = database.GetCurrentTransactionIsolationLevel();
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if (_isolationLevel > IsolationLevel.Unspecified && currentLevel < _isolationLevel)
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{
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throw new Exception("Scope requires isolation level " + _isolationLevel + ", but got " + currentLevel + " from parent.");
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}
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return _database = database;
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}
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// create a new database
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_database = _scopeProvider.DatabaseFactory.CreateDatabase();
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// enter a transaction, as a scope implies a transaction, always
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try
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{
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_database.BeginTransaction(IsolationLevel);
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return _database;
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}
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catch
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{
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_database.Dispose();
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_database = null;
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throw;
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}
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}
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}
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public IUmbracoDatabase DatabaseOrNull
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{
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get
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{
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EnsureNotDisposed();
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return ParentScope == null ? _database : ParentScope.DatabaseOrNull;
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}
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}
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/// <inheritdoc />
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public EventMessages Messages
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{
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get
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{
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EnsureNotDisposed();
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if (ParentScope != null)
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{
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return ParentScope.Messages;
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}
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return _messages ??= new EventMessages();
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// TODO: event messages?
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// this may be a problem: the messages collection will be cleared at the end of the scope
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// how shall we process it in controllers etc? if we don't want the global factory from v7?
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// it'd need to be captured by the controller
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//
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// + rename // EventMessages = ServiceMessages or something
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}
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}
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public EventMessages MessagesOrNull
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{
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get
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{
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EnsureNotDisposed();
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return ParentScope == null ? _messages : ParentScope.MessagesOrNull;
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}
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}
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/// <inheritdoc />
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public IEventDispatcher Events
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{
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get
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{
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EnsureNotDisposed();
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if (ParentScope != null)
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{
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return ParentScope.Events;
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}
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return _eventDispatcher ??= new QueuingEventDispatcher(_mediaFileManager);
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}
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}
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public IScopedNotificationPublisher Notifications
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{
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get
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{
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EnsureNotDisposed();
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if (ParentScope != null)
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{
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return ParentScope.Notifications;
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}
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return _notificationPublisher ?? (_notificationPublisher = new ScopedNotificationPublisher(_eventAggregator));
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}
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}
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/// <inheritdoc />
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public bool Complete()
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{
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if (_completed.HasValue == false)
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{
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_completed = true;
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}
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return _completed.Value;
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}
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public void Reset() => _completed = null;
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public void ChildCompleted(bool? completed)
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{
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// if child did not complete we cannot complete
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if (completed.HasValue == false || completed.Value == false)
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{
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if (LogUncompletedScopes)
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{
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_logger.LogWarning("Uncompleted Child Scope at\r\n {StackTrace}", Environment.StackTrace);
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}
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_completed = false;
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}
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}
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private void EnsureNotDisposed()
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{
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// We can't be disposed
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if (_disposed)
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{
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throw new ObjectDisposedException($"The {nameof(Scope)} ({this.GetDebugInfo()}) is already disposed");
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}
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// And neither can our ancestors if we're trying to be disposed since
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// a child must always be disposed before it's parent.
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// This is a safety check, it's actually not entirely possible that a parent can be
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// disposed before the child since that will end up with a "not the Ambient" exception.
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ParentScope?.EnsureNotDisposed();
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// TODO: safer?
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//if (Interlocked.CompareExchange(ref _disposed, 1, 0) != 0)
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// throw new ObjectDisposedException(GetType().FullName);
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}
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public void Dispose()
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{
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EnsureNotDisposed();
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if (this != _scopeProvider.AmbientScope)
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{
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var failedMessage = $"The {nameof(Scope)} {this.InstanceId} being disposed is not the Ambient {nameof(Scope)} {(_scopeProvider.AmbientScope?.InstanceId.ToString() ?? "NULL")}. This typically indicates that a child {nameof(Scope)} was not disposed, or flowed to a child thread that was not awaited, or concurrent threads are accessing the same {nameof(Scope)} (Ambient context) which is not supported. If using Task.Run (or similar) as a fire and forget tasks or to run threads in parallel you must suppress execution context flow with ExecutionContext.SuppressFlow() and ExecutionContext.RestoreFlow().";
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#if DEBUG_SCOPES
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Scope ambient = _scopeProvider.AmbientScope;
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_logger.LogWarning("Dispose error (" + (ambient == null ? "no" : "other") + " ambient)");
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if (ambient == null)
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{
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throw new InvalidOperationException("Not the ambient scope (no ambient scope).");
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}
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ScopeInfo ambientInfos = _scopeProvider.GetScopeInfo(ambient);
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ScopeInfo disposeInfos = _scopeProvider.GetScopeInfo(this);
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throw new InvalidOperationException($"{failedMessage} (see ctor stack traces).\r\n"
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+ "- ambient ->\r\n" + ambientInfos.ToString() + "\r\n"
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+ "- dispose ->\r\n" + disposeInfos.ToString() + "\r\n");
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#else
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throw new InvalidOperationException(failedMessage);
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#endif
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}
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// Decrement the lock counters on the parent if any.
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ClearLocks(InstanceId);
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if (ParentScope is null)
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{
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// We're the parent scope, make sure that locks of all scopes has been cleared
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// Since we're only reading we don't have to be in a lock
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if (ReadLocks?.Count > 0 || WriteLocks?.Count > 0)
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{
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var exception = new InvalidOperationException($"All scopes has not been disposed from parent scope: {InstanceId}, see log for more details.");
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_logger.LogError(exception, GenerateUnclearedScopesLogMessage());
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throw exception;
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}
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}
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_scopeProvider.PopAmbientScope(this); // might be null = this is how scopes are removed from context objects
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#if DEBUG_SCOPES
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_scopeProvider.Disposed(this);
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#endif
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if (_autoComplete && _completed == null)
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{
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_completed = true;
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}
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if (ParentScope != null)
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{
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ParentScope.ChildCompleted(_completed);
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}
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else
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{
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DisposeLastScope();
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}
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_disposed = true;
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}
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/// <summary>
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/// Generates a log message with all scopes that hasn't cleared their locks, including how many, and what locks they have requested.
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/// </summary>
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/// <returns>Log message.</returns>
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private string GenerateUnclearedScopesLogMessage()
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{
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// Dump the dicts into a message for the locks.
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StringBuilder builder = new StringBuilder();
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builder.AppendLine($"Lock counters aren't empty, suggesting a scope hasn't been properly disposed, parent id: {InstanceId}");
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WriteLockDictionaryToString(ReadLocks, builder, "read locks");
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WriteLockDictionaryToString(WriteLocks, builder, "write locks");
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return builder.ToString();
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}
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/// <summary>
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/// Writes a locks dictionary to a <see cref="StringBuilder"/> for logging purposes.
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/// </summary>
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/// <param name="dict">Lock dictionary to report on.</param>
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/// <param name="builder">String builder to write to.</param>
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/// <param name="dictName">The name to report the dictionary as.</param>
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private void WriteLockDictionaryToString(Dictionary<Guid, Dictionary<int, int>> dict, StringBuilder builder, string dictName)
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{
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if (dict?.Count > 0)
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{
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builder.AppendLine($"Remaining {dictName}:");
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foreach (var instance in dict)
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{
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builder.AppendLine($"Scope {instance.Key}");
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foreach (var lockCounter in instance.Value)
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{
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builder.AppendLine($"\tLock ID: {lockCounter.Key} - times requested: {lockCounter.Value}");
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}
|
|
}
|
|
}
|
|
}
|
|
|
|
private void DisposeLastScope()
|
|
{
|
|
// figure out completed
|
|
var completed = _completed.HasValue && _completed.Value;
|
|
|
|
// deal with database
|
|
var databaseException = false;
|
|
if (_database != null)
|
|
{
|
|
try
|
|
{
|
|
if (completed)
|
|
{
|
|
_database.CompleteTransaction();
|
|
}
|
|
else
|
|
{
|
|
_database.AbortTransaction();
|
|
}
|
|
}
|
|
catch
|
|
{
|
|
databaseException = true;
|
|
throw;
|
|
}
|
|
finally
|
|
{
|
|
_database.Dispose();
|
|
_database = null;
|
|
|
|
if (databaseException)
|
|
{
|
|
RobustExit(false, true);
|
|
}
|
|
}
|
|
}
|
|
|
|
RobustExit(completed, false);
|
|
}
|
|
|
|
// this chains some try/finally blocks to
|
|
// - complete and dispose the scoped filesystems
|
|
// - deal with events if appropriate
|
|
// - remove the scope context if it belongs to this scope
|
|
// - deal with detachable scopes
|
|
// here,
|
|
// - completed indicates whether the scope has been completed
|
|
// can be true or false, but in both cases the scope is exiting
|
|
// in a normal way
|
|
// - onException indicates whether completing/aborting the database
|
|
// transaction threw an exception, in which case 'completed' has
|
|
// to be false + events don't trigger and we just to some cleanup
|
|
// to ensure we don't leave a scope around, etc
|
|
private void RobustExit(bool completed, bool onException)
|
|
{
|
|
if (onException)
|
|
{
|
|
completed = false;
|
|
}
|
|
|
|
TryFinally(() =>
|
|
{
|
|
if (_scopeFileSystem == true)
|
|
{
|
|
if (completed)
|
|
{
|
|
_fscope.Complete();
|
|
}
|
|
|
|
_fscope.Dispose();
|
|
_fscope = null;
|
|
}
|
|
}, () =>
|
|
{
|
|
// deal with events
|
|
if (onException == false)
|
|
{
|
|
_eventDispatcher?.ScopeExit(completed);
|
|
_notificationPublisher?.ScopeExit(completed);
|
|
}
|
|
}, () =>
|
|
{
|
|
// if *we* created it, then get rid of it
|
|
if (_scopeProvider.AmbientContext == Context)
|
|
{
|
|
try
|
|
{
|
|
_scopeProvider.AmbientContext.ScopeExit(completed);
|
|
}
|
|
finally
|
|
{
|
|
// removes the ambient context (ambient scope already gone)
|
|
_scopeProvider.PopAmbientScopeContext();
|
|
}
|
|
}
|
|
}, () =>
|
|
{
|
|
if (Detachable)
|
|
{
|
|
// get out of the way, restore original
|
|
|
|
// TODO: Difficult to know if this is correct since this is all required
|
|
// by Deploy which I don't fully understand since there is limited tests on this in the CMS
|
|
if (OrigScope != _scopeProvider.AmbientScope)
|
|
{
|
|
_scopeProvider.PopAmbientScope(_scopeProvider.AmbientScope);
|
|
}
|
|
if (OrigContext != _scopeProvider.AmbientContext)
|
|
{
|
|
_scopeProvider.PopAmbientScopeContext();
|
|
}
|
|
|
|
Attached = false;
|
|
OrigScope = null;
|
|
OrigContext = null;
|
|
}
|
|
});
|
|
}
|
|
|
|
private static void TryFinally(params Action[] actions) => TryFinally(0, actions);
|
|
|
|
private static void TryFinally(int index, Action[] actions)
|
|
{
|
|
if (index == actions.Length)
|
|
{
|
|
return;
|
|
}
|
|
|
|
try
|
|
{
|
|
actions[index]();
|
|
}
|
|
finally
|
|
{
|
|
TryFinally(index + 1, actions);
|
|
}
|
|
}
|
|
|
|
// true if Umbraco.CoreDebugSettings.LogUncompletedScope appSetting is set to "true"
|
|
private bool LogUncompletedScopes => _coreDebugSettings.LogIncompletedScopes;
|
|
|
|
/// <summary>
|
|
/// Increment the counter of a locks dictionary, either ReadLocks or WriteLocks,
|
|
/// for a specific scope instance and lock identifier. Must be called within a lock.
|
|
/// </summary>
|
|
/// <param name="lockId">Lock ID to increment.</param>
|
|
/// <param name="instanceId">Instance ID of the scope requesting the lock.</param>
|
|
/// <param name="locks">Reference to the dictionary to increment on</param>
|
|
private void IncrementLock(int lockId, Guid instanceId, ref Dictionary<Guid, Dictionary<int, int>> locks)
|
|
{
|
|
// Since we've already checked that we're the parent in the WriteLockInner method, we don't need to check again.
|
|
// If it's the very first time a lock has been requested the WriteLocks dict hasn't been instantiated yet.
|
|
locks ??= new Dictionary<Guid, Dictionary<int, int>>();
|
|
|
|
// Try and get the dict associated with the scope id.
|
|
var locksDictFound = locks.TryGetValue(instanceId, out var locksDict);
|
|
if (locksDictFound)
|
|
{
|
|
locksDict.TryGetValue(lockId, out var value);
|
|
locksDict[lockId] = value + 1;
|
|
}
|
|
else
|
|
{
|
|
// The scope hasn't requested a lock yet, so we have to create a dict for it.
|
|
locks.Add(instanceId, new Dictionary<int, int>());
|
|
locks[instanceId][lockId] = 1;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Clears all lock counters for a given scope instance, signalling that the scope has been disposed.
|
|
/// </summary>
|
|
/// <param name="instanceId">Instance ID of the scope to clear.</param>
|
|
private void ClearLocks(Guid instanceId)
|
|
{
|
|
if (ParentScope is not null)
|
|
{
|
|
ParentScope.ClearLocks(instanceId);
|
|
}
|
|
else
|
|
{
|
|
lock (_dictionaryLocker)
|
|
{
|
|
ReadLocks?.Remove(instanceId);
|
|
WriteLocks?.Remove(instanceId);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public void ReadLock(int lockId) => ReadLockInner(InstanceId, null, lockId);
|
|
|
|
/// <inheritdoc />
|
|
public void ReadLock(TimeSpan timeout, int lockId) => ReadLockInner(InstanceId, timeout, lockId);
|
|
|
|
/// <inheritdoc />
|
|
public void WriteLock(int lockId) => WriteLockInner(InstanceId, null, lockId);
|
|
|
|
/// <inheritdoc />
|
|
public void WriteLock(TimeSpan timeout, int lockId) => WriteLockInner(InstanceId, timeout, lockId);
|
|
|
|
/// <summary>
|
|
/// Handles acquiring a read lock, will delegate it to the parent if there are any.
|
|
/// </summary>
|
|
/// <param name="instanceId">Instance ID of the requesting scope.</param>
|
|
/// <param name="timeout">Optional database timeout in milliseconds.</param>
|
|
/// <param name="lockId">Array of lock object identifiers.</param>
|
|
private void ReadLockInner(Guid instanceId, TimeSpan? timeout, int lockId)
|
|
{
|
|
if (ParentScope is not null)
|
|
{
|
|
// If we have a parent we delegate lock creation to parent.
|
|
ParentScope.ReadLockInner(instanceId, timeout, lockId);
|
|
}
|
|
else
|
|
{
|
|
// We are the outermost scope, handle the lock request.
|
|
LockInner(instanceId, ref _readLockDictionary, ref _readLocks, ObtainReadLock, ObtainTimeoutReadLock, timeout, lockId);
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Handles acquiring a write lock with a specified timeout, will delegate it to the parent if there are any.
|
|
/// </summary>
|
|
/// <param name="instanceId">Instance ID of the requesting scope.</param>
|
|
/// <param name="timeout">Optional database timeout in milliseconds.</param>
|
|
/// <param name="lockId">Array of lock object identifiers.</param>
|
|
private void WriteLockInner(Guid instanceId, TimeSpan? timeout, int lockId)
|
|
{
|
|
if (ParentScope is not null)
|
|
{
|
|
// If we have a parent we delegate lock creation to parent.
|
|
ParentScope.WriteLockInner(instanceId, timeout, lockId);
|
|
}
|
|
else
|
|
{
|
|
// We are the outermost scope, handle the lock request.
|
|
LockInner(instanceId, ref _writeLockDictionary, ref _writeLocks, ObtainWriteLock, ObtainTimeoutWriteLock, timeout, lockId);
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Handles acquiring a lock, this should only be called from the outermost scope.
|
|
/// </summary>
|
|
/// <param name="instanceId">Instance ID of the scope requesting the lock.</param>
|
|
/// <param name="locks">Reference to the applicable locks dictionary (ReadLocks or WriteLocks).</param>
|
|
/// <param name="locksSet">Reference to the applicable locks hashset (_readLocks or _writeLocks).</param>
|
|
/// <param name="obtainLock">Delegate used to request the lock from the database without a timeout.</param>
|
|
/// <param name="obtainLockTimeout">Delegate used to request the lock from the database with a timeout.</param>
|
|
/// <param name="timeout">Optional timeout parameter to specify a timeout.</param>
|
|
/// <param name="lockIds">Lock identifiers to lock on.</param>
|
|
private void LockInner(Guid instanceId, ref Dictionary<Guid, Dictionary<int, int>> locks, ref HashSet<int> locksSet,
|
|
Action<int> obtainLock, Action<int, TimeSpan> obtainLockTimeout, TimeSpan? timeout,
|
|
int lockId)
|
|
{
|
|
lock (_dictionaryLocker)
|
|
{
|
|
locksSet ??= new HashSet<int>();
|
|
// Only acquire the lock if we haven't done so yet.
|
|
if (!locksSet.Contains(lockId))
|
|
{
|
|
IncrementLock(lockId, instanceId, ref locks);
|
|
locksSet.Add(lockId);
|
|
try
|
|
{
|
|
if (timeout is null)
|
|
{
|
|
// We just want an ordinary lock.
|
|
obtainLock(lockId);
|
|
}
|
|
else
|
|
{
|
|
// We want a lock with a custom timeout
|
|
obtainLockTimeout(lockId, timeout.Value);
|
|
}
|
|
}
|
|
catch
|
|
{
|
|
// Something went wrong and we didn't get the lock
|
|
// Since we at this point have determined that we haven't got any lock with an ID of LockID, it's safe to completely remove it instead of decrementing.
|
|
locks[instanceId].Remove(lockId);
|
|
// It needs to be removed from the HashSet as well, because that's how we determine to acquire a lock.
|
|
locksSet.Remove(lockId);
|
|
throw;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// We already have a lock, but need to update the dictionary for debugging purposes.
|
|
IncrementLock(lockId, instanceId, ref locks);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Obtains an ordinary read lock.
|
|
/// </summary>
|
|
/// <param name="lockId">Lock object identifier to lock.</param>
|
|
private void ObtainReadLock(int lockId)
|
|
{
|
|
Database.SqlContext.SqlSyntax.ReadLock(Database, lockId);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Obtains a read lock with a custom timeout.
|
|
/// </summary>
|
|
/// <param name="lockId">Lock object identifier to lock.</param>
|
|
/// <param name="timeout">TimeSpan specifying the timout period.</param>
|
|
private void ObtainTimeoutReadLock(int lockId, TimeSpan timeout)
|
|
{
|
|
Database.SqlContext.SqlSyntax.ReadLock(Database, timeout, lockId);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Obtains an ordinary write lock.
|
|
/// </summary>
|
|
/// <param name="lockId">Lock object identifier to lock.</param>
|
|
private void ObtainWriteLock(int lockId)
|
|
{
|
|
Database.SqlContext.SqlSyntax.WriteLock(Database, lockId);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Obtains a write lock with a custom timeout.
|
|
/// </summary>
|
|
/// <param name="lockId">Lock object identifier to lock.</param>
|
|
/// <param name="timeout">TimeSpan specifying the timout period.</param>
|
|
private void ObtainTimeoutWriteLock(int lockId, TimeSpan timeout)
|
|
{
|
|
Database.SqlContext.SqlSyntax.WriteLock(Database, timeout, lockId);
|
|
}
|
|
}
|
|
}
|