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221 lines
12 KiB
221 lines
12 KiB
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace IPA.Loader
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{
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/// <summary>
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/// A class to represent a transaction for changing the state of loaded mods.
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/// </summary>
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public sealed class StateTransitionTransaction : IDisposable
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{
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private readonly HashSet<PluginMetadata> currentlyEnabled;
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private readonly HashSet<PluginMetadata> currentlyDisabled;
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private readonly HashSet<PluginMetadata> toEnable = new HashSet<PluginMetadata>();
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private readonly HashSet<PluginMetadata> toDisable = new HashSet<PluginMetadata>();
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internal StateTransitionTransaction(IEnumerable<PluginMetadata> enabled, IEnumerable<PluginMetadata> disabled)
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{
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currentlyEnabled = new HashSet<PluginMetadata>(enabled.ToArray());
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currentlyDisabled = new HashSet<PluginMetadata>(disabled.ToArray());
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}
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/// <summary>
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/// Gets whether or not a game restart will be necessary to fully apply this transaction.
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/// </summary>
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/// <value><see langword="true"/> if any mod who's state is changed cannot be changed at runtime, <see langword="false"/> otherwise</value>
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/// <exception cref="ObjectDisposedException">if this object has been disposed</exception>
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public bool WillNeedRestart
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=> ThrowIfDisposed<bool>()
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|| toEnable.Concat(toDisable).Any(m => m.RuntimeOptions != RuntimeOptions.DynamicInit);
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internal IEnumerable<PluginMetadata> ToEnable => toEnable;
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internal IEnumerable<PluginMetadata> ToDisable => toDisable;
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/// <summary>
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/// Gets a list of plugins that are enabled according to this transaction's current state.
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/// </summary>
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/// <exception cref="ObjectDisposedException">if this object has been disposed</exception>
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public IEnumerable<PluginMetadata> EnabledPlugins
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=> ThrowIfDisposed<IEnumerable<PluginMetadata>>() ?? DisabledPluginsInternal;
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private IEnumerable<PluginMetadata> EnabledPluginsInternal => currentlyEnabled.Except(toDisable).Concat(toEnable);
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/// <summary>
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/// Gets a list of plugins that are disabled according to this transaction's current state.
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/// </summary>
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/// <exception cref="ObjectDisposedException">if this object has been disposed</exception>
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public IEnumerable<PluginMetadata> DisabledPlugins
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=> ThrowIfDisposed<IEnumerable<PluginMetadata>>() ?? DisabledPluginsInternal;
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private IEnumerable<PluginMetadata> DisabledPluginsInternal => currentlyDisabled.Except(toEnable).Concat(toDisable);
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/// <summary>
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/// Checks if a plugin is enabled according to this transaction's current state.
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/// </summary>
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/// <remarks>
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/// <para>This should be roughly equivalent to <c>EnabledPlugins.Contains(meta)</c>, but more performant.</para>
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/// <para>This should also always return the inverse of <see cref="IsDisabled(PluginMetadata)"/> for valid plugins.</para>
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/// </remarks>
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/// <param name="meta">the plugin to check</param>
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/// <returns><see langword="true"/> if the plugin is enabled, <see langword="false"/> otherwise</returns>
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/// <exception cref="ObjectDisposedException">if this object has been disposed</exception>
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/// <seealso cref="EnabledPlugins"/>
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/// <seealso cref="IsDisabled(PluginMetadata)"/>
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public bool IsEnabled(PluginMetadata meta)
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=> ThrowIfDisposed<bool>() || IsEnabledInternal(meta);
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private bool IsEnabledInternal(PluginMetadata meta)
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=> (currentlyEnabled.Contains(meta) && !toDisable.Contains(meta))
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|| toEnable.Contains(meta);
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/// <summary>
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/// Checks if a plugin is disabled according to this transaction's current state.
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/// </summary>
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/// <remarks>
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/// <para>This should be roughly equivalent to <c>DisabledPlugins.Contains(meta)</c>, but more performant.</para>
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/// <para>This should also always return the inverse of <see cref="IsEnabled(PluginMetadata)"/> for valid plugins.</para>
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/// </remarks>
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/// <param name="meta">the plugin to check</param>
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/// <returns><see langword="true"/> if the plugin is disabled, <see langword="false"/> otherwise</returns>
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/// <exception cref="ObjectDisposedException">if this object has been disposed</exception>
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/// <seealso cref="DisabledPlugins"/>
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/// <seealso cref="IsEnabled(PluginMetadata)"/>
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public bool IsDisabled(PluginMetadata meta)
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=> ThrowIfDisposed<bool>() || IsDisabledInternal(meta);
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private bool IsDisabledInternal(PluginMetadata meta)
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=> (currentlyDisabled.Contains(meta) && !toEnable.Contains(meta))
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|| toDisable.Contains(meta);
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/// <summary>
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/// Enables a plugin in this transaction.
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/// </summary>
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/// <param name="meta">the plugin to enable</param>
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/// <param name="autoDeps">whether or not to automatically enable all dependencies of the plugin</param>
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/// <returns><see langword="true"/> if the transaction's state was changed, <see langword="false"/> otherwise</returns>
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/// <exception cref="ObjectDisposedException">if this object has been disposed</exception>
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/// <exception cref="ArgumentException">if <paramref name="meta"/> is not loadable</exception>
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/// <seealso cref="Enable(PluginMetadata, out IEnumerable{PluginMetadata}, bool)"/>
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public bool Enable(PluginMetadata meta, bool autoDeps = true)
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=> Enable(meta, out var _, autoDeps);
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/// <summary>
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/// Enables a plugin in this transaction.
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/// </summary>
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/// <remarks>
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/// <paramref name="disabledDeps"/> will only be set when <paramref name="autoDeps"/> is <see langword="false"/>.
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/// </remarks>
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/// <param name="meta">the plugin to enable</param>
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/// <param name="disabledDeps"><see langword="null"/> if successful, otherwise a set of plugins that need to be enabled first</param>
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/// <param name="autoDeps">whether or not to automatically enable all dependencies</param>
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/// <returns><see langword="true"/> if the transaction's state was changed, <see langword="false"/> otherwise</returns>
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/// <exception cref="ObjectDisposedException">if this object has been disposed</exception>
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/// <exception cref="ArgumentException">if <paramref name="meta"/> is not loadable</exception>
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public bool Enable(PluginMetadata meta, out IEnumerable<PluginMetadata> disabledDeps, bool autoDeps = false)
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{ // returns whether or not state was changed
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ThrowIfDisposed();
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if (!currentlyEnabled.Contains(meta) && !currentlyDisabled.Contains(meta))
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throw new ArgumentException(nameof(meta), "Plugin metadata does not represent a loadable plugin");
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disabledDeps = null;
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if (IsEnabledInternal(meta)) return false;
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var needsEnabled = meta.Dependencies.Where(m => DisabledPluginsInternal.Contains(m));
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if (autoDeps)
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{
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foreach (var dep in needsEnabled)
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{
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var res = Disable(dep, out var failedDisabled, true);
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if (failedDisabled == null) continue;
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disabledDeps = failedDisabled;
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return res;
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}
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}
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else if (needsEnabled.Any())
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{
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// there are currently enabled plugins that depend on this
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disabledDeps = needsEnabled;
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return false;
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}
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toDisable.Remove(meta);
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toEnable.Add(meta);
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return true;
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}
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/// <summary>
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/// Disables a plugin in this transaction.
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/// </summary>
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/// <param name="meta">the plugin to disable</param>
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/// <param name="autoDependents">whether or not to automatically disable all dependents of the plugin</param>
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/// <returns><see langword="true"/> if the transaction's state was changed, <see langword="false"/> otherwise</returns>
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/// <exception cref="ObjectDisposedException">if this object has been disposed</exception>
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/// <exception cref="ArgumentException">if <paramref name="meta"/> is not loadable</exception>
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/// <seealso cref="Disable(PluginMetadata, out IEnumerable{PluginMetadata}, bool)"/>
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public bool Disable(PluginMetadata meta, bool autoDependents = true)
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=> Disable(meta, out var _, autoDependents);
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/// <summary>
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/// Disables a plugin in this transaction.
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/// </summary>
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/// <remarks>
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/// <paramref name="enabledDependents"/> will only be set when <paramref name="autoDependents"/> is <see langword="false"/>.
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/// </remarks>
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/// <param name="meta">the plugin to disable</param>
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/// <param name="enabledDependents"><see langword="null"/> if successful, otherwise a set of plugins that need to be disabled first</param>
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/// <param name="autoDependents">whether or not to automatically disable all dependents of the plugin</param>
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/// <returns><see langword="true"/> if the transaction's state was changed, <see langword="false"/> otherwise</returns>
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/// <exception cref="ObjectDisposedException">if this object has been disposed</exception>
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/// <exception cref="ArgumentException">if <paramref name="meta"/> is not loadable</exception>
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public bool Disable(PluginMetadata meta, out IEnumerable<PluginMetadata> enabledDependents, bool autoDependents = false)
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{ // returns whether or not state was changed
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ThrowIfDisposed();
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if (!currentlyEnabled.Contains(meta) && !currentlyDisabled.Contains(meta))
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throw new ArgumentException(nameof(meta), "Plugin metadata does not represent a loadable plugin");
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enabledDependents = null;
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if (IsDisabledInternal(meta)) return false;
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var needsDisabled = EnabledPluginsInternal.Where(m => m.Dependencies.Contains(meta));
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if (autoDependents)
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{
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foreach (var dep in needsDisabled)
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{
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var res = Disable(dep, out var failedEnabled, true);
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if (failedEnabled == null) continue;
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enabledDependents = failedEnabled;
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return res;
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}
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}
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else if (needsDisabled.Any())
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{
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// there are currently enabled plugins that depend on this
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enabledDependents = needsDisabled;
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return false;
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}
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toDisable.Add(meta);
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toEnable.Remove(meta);
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return true;
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}
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/// <summary>
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/// Commits this transaction to actual state, enabling and disabling plugins as necessary.
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/// </summary>
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/// <returns>a <see cref="Task"/> which completes whenever all disables complete</returns>
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/// <exception cref="ObjectDisposedException">if this object has been disposed</exception>
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public Task Commit() => ThrowIfDisposed<Task>() ?? PluginManager.CommitTransaction(this);
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private void ThrowIfDisposed() => ThrowIfDisposed<byte>();
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private T ThrowIfDisposed<T>()
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{
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if (disposed)
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throw new ObjectDisposedException(nameof(StateTransitionTransaction));
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return default;
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}
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private bool disposed = false;
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/// <summary>
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/// Disposes and discards this transaction without committing it.
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/// </summary>
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public void Dispose()
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=> disposed = true;
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}
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}
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