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197 lines
8.3 KiB
197 lines
8.3 KiB
#nullable enable
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using IPA.Logging;
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using System;
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using System.Collections.Generic;
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using System.Reflection;
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using System.Threading;
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using System.Runtime.CompilerServices;
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using System.ComponentModel;
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using IPA.Config.Data;
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#if NET3
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using Net3_Proxy;
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using Array = Net3_Proxy.Array;
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#endif
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[assembly: InternalsVisibleTo(IPA.Config.Stores.GeneratedStore.AssemblyVisibilityTarget)]
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namespace IPA.Config.Stores
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{
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internal static partial class GeneratedStoreImpl
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{
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internal interface IGeneratedStore
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{
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Type Type { get; }
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IGeneratedStore Parent { get; }
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Impl Impl { get; }
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void OnReload();
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void Changed();
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IDisposable ChangeTransaction();
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Value Serialize();
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void Deserialize(Value val);
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}
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internal interface IGeneratedStore<T> : IGeneratedStore where T : class
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{
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void CopyFrom(T source, bool useLock);
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}
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internal interface IGeneratedPropertyChanged : INotifyPropertyChanged
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{
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PropertyChangedEventHandler PropertyChangedEvent { get; }
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}
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internal class Impl : IConfigStore
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{
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private readonly IGeneratedStore generated;
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private long enteredTransactions;
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internal static ConstructorInfo Ctor = typeof(Impl).GetConstructor(new[] { typeof(IGeneratedStore) });
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public Impl(IGeneratedStore store) => generated = store;
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private readonly AutoResetEvent resetEvent = new(false);
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public WaitHandle SyncObject => resetEvent;
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public static WaitHandle? ImplGetSyncObject(IGeneratedStore s) => FindImpl(s)?.SyncObject;
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internal static MethodInfo ImplGetSyncObjectMethod = typeof(Impl).GetMethod(nameof(ImplGetSyncObject));
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public ReaderWriterLockSlim WriteSyncObject { get; } = new();
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public static ReaderWriterLockSlim? ImplGetWriteSyncObject(IGeneratedStore s) => FindImpl(s)?.WriteSyncObject;
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internal static MethodInfo ImplGetWriteSyncObjectMethod = typeof(Impl).GetMethod(nameof(ImplGetWriteSyncObject));
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internal static MethodInfo ImplSignalChangedMethod = typeof(Impl).GetMethod(nameof(ImplSignalChanged));
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public static void ImplSignalChanged(IGeneratedStore s) => FindImpl(s)?.SignalChanged();
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public void SignalChanged()
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{
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try
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{
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_ = resetEvent.Set();
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}
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catch (ObjectDisposedException e)
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{
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Logger.config.Error($"ObjectDisposedException while signalling a change for generated store {generated?.GetType()}");
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Logger.config.Error(e);
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}
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}
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internal static MethodInfo ImplInvokeChangedMethod = typeof(Impl).GetMethod(nameof(ImplInvokeChanged));
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public static void ImplInvokeChanged(IGeneratedStore s) => FindImpl(s)?.InvokeChanged();
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public void InvokeChanged() => generated.Changed();
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internal static MethodInfo ImplTakeReadMethod = typeof(Impl).GetMethod(nameof(ImplTakeRead));
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public static void ImplTakeRead(IGeneratedStore s) => FindImpl(s)?.TakeRead();
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public void TakeRead()
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{
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if (!WriteSyncObject.IsWriteLockHeld)
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WriteSyncObject.EnterReadLock();
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}
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internal static MethodInfo ImplReleaseReadMethod = typeof(Impl).GetMethod(nameof(ImplReleaseRead));
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public static void ImplReleaseRead(IGeneratedStore s) => FindImpl(s)?.ReleaseRead();
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public void ReleaseRead()
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{
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if (!WriteSyncObject.IsWriteLockHeld)
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WriteSyncObject.ExitReadLock();
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}
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internal static MethodInfo ImplTakeWriteMethod = typeof(Impl).GetMethod(nameof(ImplTakeWrite));
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public static void ImplTakeWrite(IGeneratedStore s) => FindImpl(s)?.TakeWrite();
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public void TakeWrite() => WriteSyncObject.EnterWriteLock();
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internal static MethodInfo ImplReleaseWriteMethod = typeof(Impl).GetMethod(nameof(ImplReleaseWrite));
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public static void ImplReleaseWrite(IGeneratedStore s) => FindImpl(s)?.ReleaseWrite();
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public void ReleaseWrite() => WriteSyncObject.ExitWriteLock();
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internal static MethodInfo ImplChangeTransactionMethod = typeof(Impl).GetMethod(nameof(ImplChangeTransaction));
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public static IDisposable? ImplChangeTransaction(IGeneratedStore s, IDisposable nest) => FindImpl(s)?.ChangeTransaction(nest);
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// TODO: improve trasactionals so they don't always save in every case
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public IDisposable ChangeTransaction(IDisposable nest, bool takeWrite = true)
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=> GetFreeTransaction().InitWith(this, nest, takeWrite && !WriteSyncObject.IsWriteLockHeld);
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private static ChangeTransactionObj GetFreeTransaction()
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=> freeTransactionObjs.Count > 0 ? freeTransactionObjs.Pop()
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: new ChangeTransactionObj();
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// TODO: maybe sometimes clean this?
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private static readonly Stack<ChangeTransactionObj> freeTransactionObjs = new();
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private sealed class ChangeTransactionObj : IDisposable
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{
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private struct Data
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{
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public readonly Impl impl;
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public readonly bool ownsWrite;
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public readonly IDisposable nested;
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public Data(Impl impl, bool takeWrite, IDisposable nest)
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{
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this.impl = impl; ownsWrite = takeWrite; nested = nest;
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}
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}
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private Data data;
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public ChangeTransactionObj InitWith(Impl impl, IDisposable nest, bool takeWrite)
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{
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data = new Data(impl, takeWrite, nest);
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_ = Interlocked.Increment(ref impl.enteredTransactions);
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if (data.ownsWrite)
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impl.TakeWrite();
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return this;
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}
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public void Dispose() => Dispose(true);
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private void Dispose(bool addToStore)
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{
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if (data.impl != null && Interlocked.Decrement(ref data.impl.enteredTransactions) == 0)
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{
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data.impl.InvokeChanged();
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}
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data.nested?.Dispose();
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try
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{
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if (data.ownsWrite)
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data.impl?.ReleaseWrite();
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}
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catch
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{
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}
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data = default;
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if (addToStore)
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freeTransactionObjs.Push(this);
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}
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~ChangeTransactionObj() => Dispose(false);
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}
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public static Impl? FindImpl(IGeneratedStore store)
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{
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while (store?.Parent != null) store = store.Parent; // walk to the top of the tree
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return store?.Impl;
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}
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internal static MethodInfo ImplReadFromMethod = typeof(Impl).GetMethod(nameof(ImplReadFrom));
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public static void ImplReadFrom(IGeneratedStore s, ConfigProvider provider) => FindImpl(s)?.ReadFrom(provider);
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public void ReadFrom(ConfigProvider provider)
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{
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Logger.config.Debug($"Generated impl ReadFrom {generated.GetType()}");
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var values = provider.Load();
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//Logger.config.Debug($"Read {values}");
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generated.Deserialize(values);
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using var transaction = generated.ChangeTransaction();
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generated.OnReload();
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}
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internal static MethodInfo ImplWriteToMethod = typeof(Impl).GetMethod(nameof(ImplWriteTo));
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public static void ImplWriteTo(IGeneratedStore s, ConfigProvider provider) => FindImpl(s)?.WriteTo(provider);
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public void WriteTo(ConfigProvider provider)
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{
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Logger.config.Debug($"Generated impl WriteTo {generated.GetType()}");
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var values = generated.Serialize();
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//Logger.config.Debug($"Serialized {values}");
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provider.Store(values);
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}
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}
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}
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}
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