//===================================================================================
// Microsoft patterns & practices
// Composite Application Guidance for Windows Presentation Foundation and Silverlight
//===================================================================================
// Copyright (c) Microsoft Corporation. All rights reserved.
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE.
//===================================================================================
// The example companies, organizations, products, domain names,
// e-mail addresses, logos, people, places, and events depicted
// herein are fictitious. No association with any real company,
// organization, product, domain name, email address, logo, person,
// places, or events is intended or should be inferred.
//===================================================================================
using System;
using System.ComponentModel;
namespace Microsoft.Practices.Composite.Events
{
/// <summary>
/// Extends <see cref="EventSubscription{TPayload}"/> to invoke the <see cref="EventSubscription{TPayload}.Action"/> delegate in a background thread.
/// </summary>
/// <typeparam name="TPayload">The type to use for the generic <see cref="System.Action{TPayload}"/> and <see cref="Predicate{TPayload}"/> types.</typeparam>
public class BackgroundEventSubscription<TPayload> : EventSubscription<TPayload>
{
/// <summary>
/// Creates a new instance of <see cref="BackgroundEventSubscription{TPayload}"/>.
/// </summary>
/// <param name="actionReference">A reference to a delegate of type <see cref="System.Action{TPayload}"/>.</param>
/// <param name="filterReference">A reference to a delegate of type <see cref="Predicate{TPayload}"/>.</param>
/// <exception cref="ArgumentNullException">When <paramref name="actionReference"/> or <see paramref="filterReference"/> are <see langword="null" />.</exception>
/// <exception cref="ArgumentException">When the target of <paramref name="actionReference"/> is not of type <see cref="System.Action{TPayload}"/>,
/// or the target of <paramref name="filterReference"/> is not of type <see cref="Predicate{TPayload}"/>.</exception>
public BackgroundEventSubscription(IDelegateReference actionReference, IDelegateReference filterReference)
: base(actionReference, filterReference)
{
}
/// <summary>
/// Invokes the specified <see cref="System.Action{TPayload}"/> in an asynchronous thread by using a <see cref="BackgroundWorker"/>.
/// </summary>
/// <param name="action">The action to execute.</param>
/// <param name="argument">The payload to pass <paramref name="action"/> while invoking it.</param>
public override void InvokeAction(Action<TPayload> action, TPayload argument)
{
BackgroundWorker worker = new BackgroundWorker();
worker.DoWork += (sender, e) => action((TPayload)e.Argument);
// handle worker.RunWorkerCompleted and log exceptions?
worker.RunWorkerAsync(argument);
}
}
}