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POSimple Injector: Inject same UnitOfWork instance across services of the same graph
 

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  1. POSimple Injector: Inject same UnitOfWork instance across services of the same graph
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    <p>I have multiple services, each of which have a <code>UnitOfWork</code> injected into the constructor using the <a href="http://simpleinjector.codeplex.com">Simple Injector</a> IoC container.</p> <p>Currently I can see each <code>UnitOfWork</code> instance is a separate object, this is bad as i am using Entity Framework and require the same context reference across all units of work.</p> <p>How can I ensure the same <code>UnitOfWork</code> instance is injected into all services per each resolve request? My <code>UnitOfWor</code> will be saved by an external command handler decorator after the command completes.</p> <p>Please note, this is a common library and will be used for both MVC and Windows Forms, it would be nice to have a generic solution for both platforms if possible.</p> <p>Code is below:</p> <pre><code>// snippet of code that registers types void RegisterTypes() { // register general unit of work class for use by majority of service layers container.Register&lt;IUnitOfWork, UnitOfWork&gt;(); // provide a factory for singleton classes to create their own units of work // at will container.RegisterSingle&lt;IUnitOfWorkFactory, UnitOfWorkFactory&gt;(); // register logger container.RegisterSingle&lt;ILogger, NLogForUnitOfWork&gt;(); // register all generic command handlers container.RegisterManyForOpenGeneric(typeof(ICommandHandler&lt;&gt;), AppDomain.CurrentDomain.GetAssemblies()); container.RegisterDecorator(typeof(ICommandHandler&lt;&gt;), typeof(TransactionCommandHandlerDecorator&lt;&gt;)); // register services that will be used by command handlers container.Register&lt;ISynchronisationService, SynchronisationService&gt;(); container.Register&lt;IPluginManagerService, PluginManagerService&gt;(); } </code></pre> <p>The desired outcome of the below line is to create a object which has a shared UnitOfWork instance throughout the constructed object graph:</p> <pre><code>var handler = Resolve&lt;ICommandHandler&lt;SyncExternalDataCommand&gt;&gt;(); </code></pre> <p>Here are my services:</p> <pre><code>public class PluginManagerService : IPluginSettingsService { public PluginManagerService(IUnitOfWork unitOfWork) { this.unitOfWork = unitOfWork; } private readonly unitOfWork; void IPluginSettingsService.RegisterPlugins() { // manipulate the unit of work } } public class SynchronisationService : ISynchronisationService { public PluginManagerService(IUnitOfWork unitOfWork) { this.unitOfWork = unitOfWork; } private readonly unitOfWork; void ISynchronisationService.SyncData() { // manipulate the unit of work } } public class SyncExternalDataCommandHandler : ICommandHandler&lt;SyncExternalDataCommand&gt; { ILogger logger; ISynchronisationService synchronisationService; IPluginManagerService pluginManagerService; public SyncExternalDataCommandHandler( ISynchronisationService synchronisationService, IPluginManagerService pluginManagerService, ILogger logger) { this.synchronisationService = synchronisationService; this.pluginManagerService = pluginManagerService; this.logger = logger; } public void Handle(SyncExternalDataCommand command) { // here i will call both services functions, however as of now each // has a different UnitOfWork reference internally, we need them to // be common. this.synchronisationService.SyncData(); this.pluginManagerService.RegisterPlugins(); } } </code></pre>
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