51 lines
1.8 KiB
C#
51 lines
1.8 KiB
C#
// Copyright (c) Microsoft Corporation. All rights reserved.
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// Licensed under the MIT license. See LICENSE file in the project root for details.
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using System;
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using System.Collections.Generic;
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namespace MyDriving.Utils
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{
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/// <summary>
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/// Simple ServiceLocator implementation.
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/// </summary>
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public sealed class ServiceLocator
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{
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static readonly Lazy<ServiceLocator> instance = new Lazy<ServiceLocator>(() => new ServiceLocator());
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readonly Dictionary<Type, Lazy<object>> registeredServices = new Dictionary<Type, Lazy<object>>();
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/// <summary>
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/// Singleton instance for default service locator
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/// </summary>
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public static ServiceLocator Instance => instance.Value;
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/// <summary>
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/// Add a new contract + service implementation
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/// </summary>
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/// <typeparam name="TContract">Contract type</typeparam>
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/// <typeparam name="TService">Service type</typeparam>
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public void Add<TContract, TService>() where TService : new()
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{
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registeredServices[typeof (TContract)] =
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new Lazy<object>(() => Activator.CreateInstance(typeof (TService)));
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}
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/// <summary>
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/// This resolves a service type and returns the implementation. Note that this
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/// assumes the key used to register the object is of the appropriate type or
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/// this method will throw an InvalidCastException!
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/// </summary>
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/// <typeparam name="T">Type to resolve</typeparam>
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/// <returns>Implementation</returns>
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public T Resolve<T>() where T : class
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{
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Lazy<object> service;
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if (registeredServices.TryGetValue(typeof (T), out service))
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{
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return (T) service.Value;
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}
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return null;
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}
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}
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} |