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| #region License | ||
| // | ||
| // Servant | ||
| // | ||
| // Copyright 2016 Drew Noakes | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
| // More information about this project is available at: | ||
| // | ||
| // https://github.com/drewnoakes/servant | ||
| // | ||
| #endregion | ||
|
|
||
| namespace Servant | ||
| { | ||
| /// <summary> | ||
| /// Specifies how instances are reused between dependants. | ||
| /// </summary> | ||
| public enum Lifestyle | ||
| { | ||
| /// <summary> | ||
| /// Only a single instance of the service will be created. | ||
| /// </summary> | ||
| Singleton, | ||
|
|
||
| /// <summary> | ||
| /// A new instance of the service will be created for each dependant. | ||
| /// </summary> | ||
| Transient | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,45 @@ | ||
| #region License | ||
| // | ||
| // Servant | ||
| // | ||
| // Copyright 2016 Drew Noakes | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
| // More information about this project is available at: | ||
| // | ||
| // https://github.com/drewnoakes/servant | ||
| // | ||
| #endregion | ||
|
|
||
| using System; | ||
| using System.Diagnostics.CodeAnalysis; | ||
|
|
||
| namespace Servant | ||
| { | ||
| /// <summary> | ||
| /// An exception raised by Servant. | ||
| /// </summary> | ||
| [ExcludeFromCodeCoverage] | ||
| public sealed class ServantException : Exception | ||
| { | ||
| /// <inheritdoc /> | ||
| public ServantException() { } | ||
|
|
||
| /// <inheritdoc /> | ||
| public ServantException(string message) : base(message) { } | ||
|
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||
| /// <inheritdoc /> | ||
| public ServantException(string message, Exception innerException) : base(message, innerException) { } | ||
| } | ||
| } |
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| #region License | ||
| // | ||
| // Servant | ||
| // | ||
| // Copyright 2016 Drew Noakes | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
| // More information about this project is available at: | ||
| // | ||
| // https://github.com/drewnoakes/servant | ||
| // | ||
| #endregion | ||
|
|
||
| using System; | ||
| using JetBrains.Annotations; | ||
|
|
||
| namespace Servant | ||
| { | ||
| internal sealed class TypeEntry | ||
| { | ||
| public Type DeclaredType { get; } | ||
|
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| [CanBeNull] public TypeProvider Provider { get; set; } | ||
|
|
||
| public TypeEntry(Type declaredType) | ||
| { | ||
| DeclaredType = declaredType; | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| #region License | ||
| // | ||
| // Servant | ||
| // | ||
| // Copyright 2016 Drew Noakes | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
| // More information about this project is available at: | ||
| // | ||
| // https://github.com/drewnoakes/servant | ||
| // | ||
| #endregion | ||
|
|
||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
| using System.Threading.Tasks; | ||
| using JetBrains.Annotations; | ||
|
|
||
| namespace Servant | ||
| { | ||
| internal sealed class TypeProvider | ||
| { | ||
| public Lifestyle Lifestyle { get; } | ||
| public IReadOnlyList<TypeEntry> Dependencies { get; } | ||
|
|
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| private readonly Servant _servant; | ||
| private readonly Func<object[], Task<object>> _factory; | ||
| private readonly Type _declaredType; | ||
|
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| [CanBeNull] private object _singletonInstance; | ||
|
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| public TypeProvider(Servant servant, Func<object[], Task<object>> factory, Type declaredType, Lifestyle lifestyle, IReadOnlyList<TypeEntry> dependencies) | ||
| { | ||
| _servant = servant; | ||
| _factory = factory; | ||
| _declaredType = declaredType; | ||
| Lifestyle = lifestyle; | ||
| Dependencies = dependencies; | ||
| } | ||
|
|
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| public async Task<object> GetAsync() | ||
| { | ||
| // TODO make concurrency-safe here to avoid double-allocation of singleton | ||
|
|
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| if (Lifestyle == Lifestyle.Singleton && _singletonInstance != null) | ||
| return _singletonInstance; | ||
|
|
||
| // find arguments | ||
| var argumentTasks = new List<Task<object>>(); | ||
| foreach (var dep in Dependencies) | ||
| { | ||
| if (dep.Provider == null) | ||
| { | ||
| // No provider exists for this dependency. | ||
| var message = $"Type \"{_declaredType}\" depends upon unregistered type \"{dep.DeclaredType}\"."; | ||
|
|
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| // See whether we have a super-type of the requested type. | ||
| var superTypes = _servant.GetRegisteredTypes().Where(type => type.IsAssignableFrom(dep.DeclaredType)).ToList(); | ||
| if (superTypes.Any()) | ||
| message += $" Did you mean to reference registered super type {string.Join(" or ", superTypes.Select(st => $"\"{st}\""))}?"; | ||
|
|
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| throw new ServantException(message); | ||
| } | ||
| argumentTasks.Add(dep.Provider.GetAsync()); | ||
| } | ||
|
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| await Task.WhenAll(argumentTasks); | ||
|
|
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| var instance = await _factory.Invoke(argumentTasks.Select(t => t.Result).ToArray()); | ||
|
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| if (instance == null) | ||
| throw new ServantException($"Instance for type \"{_declaredType}\" cannot be null."); | ||
|
|
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| if (!_declaredType.IsInstanceOfType(instance)) | ||
| throw new ServantException($"Instance produced for type \"{_declaredType}\" is not an instance of that type."); | ||
|
|
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| if (Lifestyle == Lifestyle.Singleton) | ||
| { | ||
| _singletonInstance = instance; | ||
|
|
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| var disposable = instance as IDisposable; | ||
| if (disposable != null) | ||
| _servant.PushDisposableSingleton(disposable); | ||
| } | ||
|
|
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| return instance; | ||
| } | ||
| } | ||
| } |