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source: branches/RemoveBackwardsCompatibility/HeuristicLab.Persistence/3.3/Default/CompositeSerializers/Storable/StorableSerializer.cs @ 17627

Last change on this file since 17627 was 12012, checked in by ascheibe, 10 years ago

#2212 merged r12008, r12009, r12010 back into trunk

File size: 10.4 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Collections.Generic;
24using System.Linq;
25using System.Reflection;
26using System.Reflection.Emit;
27using System.Text;
28using HeuristicLab.Persistence.Core;
29using HeuristicLab.Persistence.Interfaces;
30
31namespace HeuristicLab.Persistence.Default.CompositeSerializers.Storable {
32
33  /// <summary>
34  /// Intended for serialization of all custom classes. Classes should have the
35  /// <c>[StorableClass]</c> attribute set. The default mode is to serialize
36  /// members with the <c>[Storable]</c> attribute set. Alternatively the
37  /// storable mode can be set to <c>AllFields</c>, <c>AllProperties</c>
38  /// or <c>AllFieldsAndAllProperties</c>.
39  /// </summary>
40  [StorableClass]
41  public sealed class StorableSerializer : ICompositeSerializer {
42
43    public StorableSerializer() {
44      accessorListCache = new AccessorListCache();
45      accessorCache = new AccessorCache();
46      constructorCache = new Dictionary<Type, Constructor>();
47      hookCache = new Dictionary<HookDesignator, List<StorableReflection.Hook>>();
48    }
49
50    [StorableConstructor]
51    private StorableSerializer(bool deserializing) : this() { }
52
53    #region ICompositeSerializer implementation
54
55    /// <summary>
56    /// Priority 200, one of the first default composite serializers to try.
57    /// </summary>
58    /// <value></value>
59    public int Priority {
60      get { return 200; }
61    }
62
63    /// <summary>
64    /// Determines for every type whether the composite serializer is applicable.
65    /// </summary>
66    /// <param name="type">The type.</param>
67    /// <returns>
68    ///   <c>true</c> if this instance can serialize the specified type; otherwise, <c>false</c>.
69    /// </returns>
70    public bool CanSerialize(Type type) {
71      var markedStorable = StorableReflection.HasStorableClassAttribute(type);
72      if (GetConstructor(type) == null)
73        if (markedStorable)
74          throw new Exception("[Storable] type has no default constructor and no [StorableConstructor]");
75        else
76          return false;
77      if (!StorableReflection.IsEmptyOrStorableType(type, true))
78        if (markedStorable)
79          throw new Exception("[Storable] type has non emtpy, non [Storable] base classes");
80        else
81          return false;
82      return true;
83    }
84
85    /// <summary>
86    /// Give a reason if possibly why the given type cannot be serialized by this
87    /// ICompositeSerializer.
88    /// </summary>
89    /// <param name="type">The type.</param>
90    /// <returns>
91    /// A string justifying why type cannot be serialized.
92    /// </returns>
93    public string JustifyRejection(Type type) {
94      var sb = new StringBuilder();
95      if (GetConstructor(type) == null)
96        sb.Append("class has no default constructor and no [StorableConstructor]");
97      if (!StorableReflection.IsEmptyOrStorableType(type, true))
98        sb.Append("class (or one of its bases) is not empty and not marked [Storable]; ");
99      return sb.ToString();
100    }
101
102    /// <summary>
103    /// Creates the meta info.
104    /// </summary>
105    /// <param name="o">The object.</param>
106    /// <returns>A list of storable components.</returns>
107    public IEnumerable<Tag> CreateMetaInfo(object o) {
108      InvokeHook(HookType.BeforeSerialization, o);
109      return new Tag[] { };
110    }
111
112    /// <summary>
113    /// Decompose an object into <see cref="Tag"/>s, the tag name can be null,
114    /// the order in which elements are generated is guaranteed to be
115    /// the same as they will be supplied to the Populate method.
116    /// </summary>
117    /// <param name="obj">An object.</param>
118    /// <returns>An enumerable of <see cref="Tag"/>s.</returns>
119    public IEnumerable<Tag> Decompose(object obj) {
120      return from accessor in GetStorableAccessors(obj.GetType())
121             where accessor.Get != null
122             select new Tag(accessor.Name, accessor.Get(obj));
123    }
124
125    /// <summary>
126    /// Create an instance of the object using the provided meta information.
127    /// </summary>
128    /// <param name="type">A type.</param>
129    /// <param name="metaInfo">The meta information.</param>
130    /// <returns>A fresh instance of the provided type.</returns>
131    public object CreateInstance(Type type, IEnumerable<Tag> metaInfo) {
132      try {
133        return GetConstructor(type)();
134      } catch (TargetInvocationException x) {
135        throw new PersistenceException(
136          "Could not instantiate storable object: Encountered exception during constructor call",
137          x.InnerException);
138      }
139    }
140
141    /// <summary>
142    /// Populates the specified instance.
143    /// </summary>
144    /// <param name="instance">The instance.</param>
145    /// <param name="objects">The objects.</param>
146    /// <param name="type">The type.</param>
147    public void Populate(object instance, IEnumerable<Tag> objects, Type type) {
148      var memberDict = new Dictionary<string, Tag>();
149      var iter = objects.GetEnumerator();
150      while (iter.MoveNext()) {
151        memberDict.Add(iter.Current.Name, iter.Current);
152      }
153      foreach (var accessor in GetStorableAccessors(instance.GetType())) {
154        if (accessor.Set != null) {
155          if (memberDict.ContainsKey(accessor.Name)) {
156            accessor.Set(instance, memberDict[accessor.Name].Value);
157          } else if (accessor.DefaultValue != null) {
158            accessor.Set(instance, accessor.DefaultValue);
159          }
160        }
161      }
162      InvokeHook(HookType.AfterDeserialization, instance);
163    }
164
165    #endregion
166
167    #region constants & private data types
168
169    private const BindingFlags ALL_CONSTRUCTORS =
170      BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
171
172    private sealed class HookDesignator : Tuple<Type, HookType> {
173      public HookDesignator(Type type, HookType hookType) : base(type, hookType) { }
174    }
175
176    private sealed class AccessorListCache : Dictionary<Type, IEnumerable<DataMemberAccessor>> { }
177    private sealed class AccessorCache : Dictionary<MemberInfo, DataMemberAccessor> { }
178    private delegate object Constructor();
179
180    #endregion
181
182    #region caches
183
184    private readonly AccessorListCache accessorListCache;
185    private readonly AccessorCache accessorCache;
186    private readonly Dictionary<Type, Constructor> constructorCache;
187    private readonly Dictionary<HookDesignator, List<StorableReflection.Hook>> hookCache;
188
189    #endregion
190
191    #region attribute access
192
193    private IEnumerable<DataMemberAccessor> GetStorableAccessors(Type type) {
194      lock (accessorListCache) {
195        if (accessorListCache.ContainsKey(type))
196          return accessorListCache[type];
197        var storableMembers = StorableReflection
198          .GenerateStorableMembers(type)
199          .Select(GetMemberAccessor)
200          .ToList();
201        accessorListCache[type] = storableMembers;
202        return storableMembers;
203      }
204    }
205
206    private DataMemberAccessor GetMemberAccessor(StorableMemberInfo mi) {
207      lock (accessorCache) {
208        if (accessorCache.ContainsKey(mi.MemberInfo))
209          return new DataMemberAccessor(accessorCache[mi.MemberInfo], mi.DisentangledName, mi.DefaultValue);
210        var dma = new DataMemberAccessor(mi.MemberInfo, mi.DisentangledName, mi.DefaultValue);
211        accessorCache[mi.MemberInfo] = dma;
212        return dma;
213      }
214    }
215
216    private Constructor GetConstructor(Type type) {
217      lock (constructorCache) {
218        if (constructorCache.ContainsKey(type))
219          return constructorCache[type];
220        var c = FindStorableConstructor(type) ?? GetDefaultConstructor(type);
221        constructorCache.Add(type, c);
222        return c;
223      }
224    }
225
226    private Constructor GetDefaultConstructor(Type type) {
227      var ci = type.GetConstructor(ALL_CONSTRUCTORS, null, Type.EmptyTypes, null);
228      if (ci == null)
229        return null;
230      var dm = new DynamicMethod("", typeof(object), null, type, true);
231      var ilgen = dm.GetILGenerator();
232      ilgen.Emit(OpCodes.Newobj, ci);
233      ilgen.Emit(OpCodes.Ret);
234      return (Constructor)dm.CreateDelegate(typeof(Constructor));
235    }
236
237    private Constructor FindStorableConstructor(Type type) {
238      foreach (var ci in type
239        .GetConstructors(ALL_CONSTRUCTORS)
240        .Where(ci => ci.GetCustomAttributes(typeof(StorableConstructorAttribute), false).Length > 0)) {
241        if (ci.GetParameters().Length != 1 ||
242            ci.GetParameters()[0].ParameterType != typeof(bool))
243          throw new PersistenceException("StorableConstructor must have exactly one argument of type bool");
244        var dm = new DynamicMethod("", typeof(object), null, type, true);
245        var ilgen = dm.GetILGenerator();
246        ilgen.Emit(OpCodes.Ldc_I4_1); // load true
247        ilgen.Emit(OpCodes.Newobj, ci);
248        ilgen.Emit(OpCodes.Ret);
249        return (Constructor)dm.CreateDelegate(typeof(Constructor));
250      }
251      return null;
252    }
253
254    private void InvokeHook(HookType hookType, object obj) {
255      if (obj == null)
256        throw new ArgumentNullException("obj");
257      foreach (var hook in GetHooks(hookType, obj.GetType())) {
258        hook(obj);
259      }
260    }
261
262    private IEnumerable<StorableReflection.Hook> GetHooks(HookType hookType, Type type) {
263      lock (hookCache) {
264        List<StorableReflection.Hook> hooks;
265        var designator = new HookDesignator(type, hookType);
266        hookCache.TryGetValue(designator, out hooks);
267        if (hooks != null)
268          return hooks;
269        hooks = new List<StorableReflection.Hook>(StorableReflection.CollectHooks(hookType, type));
270        hookCache.Add(designator, hooks);
271        return hooks;
272      }
273    }
274
275    #endregion
276
277
278
279  }
280
281}
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