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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
using System.ComponentModel;
using System.Threading;
namespace System.Reactive.PlatformServices
{
/// <summary>
/// (Infrastructure) Provides access to the host's lifecycle management services.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public static class HostLifecycleService
{
private static Lazy<IHostLifecycleNotifications> s_notifications = new Lazy<IHostLifecycleNotifications>(InitializeNotifications);
private static int _refCount;
/// <summary>
/// Event that gets raised when the host suspends the application.
/// </summary>
public static event EventHandler<HostSuspendingEventArgs> Suspending;
/// <summary>
/// Event that gets raised when the host resumes the application.
/// </summary>
public static event EventHandler<HostResumingEventArgs> Resuming;
/// <summary>
/// Adds a reference to the host lifecycle manager, causing it to be sending notifications.
/// </summary>
public static void AddRef()
{
if (Interlocked.Increment(ref _refCount) == 1)
{
var notifications = s_notifications.Value;
if (notifications != null)
{
notifications.Suspending += OnSuspending;
notifications.Resuming += OnResuming;
}
}
}
/// <summary>
/// Removes a reference to the host lifecycle manager, causing it to stop sending notifications
/// if the removed reference was the last one.
/// </summary>
public static void Release()
{
if (Interlocked.Decrement(ref _refCount) == 0)
{
var notifications = s_notifications.Value;
if (notifications != null)
{
notifications.Suspending -= OnSuspending;
notifications.Resuming -= OnResuming;
}
}
}
private static void OnSuspending(object sender, HostSuspendingEventArgs e)
{
var suspending = Suspending;
if (suspending != null)
suspending(sender, e);
}
private static void OnResuming(object sender, HostResumingEventArgs e)
{
var resuming = Resuming;
if (resuming != null)
resuming(sender, e);
}
private static IHostLifecycleNotifications InitializeNotifications()
{
return PlatformEnlightenmentProvider.Current.GetService<IHostLifecycleNotifications>();
}
}
/// <summary>
/// (Infrastructure) Provides notifications about the host's lifecycle events.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public interface IHostLifecycleNotifications
{
/// <summary>
/// Event that gets raised when the host suspends.
/// </summary>
event EventHandler<HostSuspendingEventArgs> Suspending;
/// <summary>
/// Event that gets raised when the host resumes.
/// </summary>
event EventHandler<HostResumingEventArgs> Resuming;
}
/// <summary>
/// (Infrastructure) Event arguments for host suspension events.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public class HostSuspendingEventArgs : EventArgs
{
}
/// <summary>
/// (Infrastructure) Event arguments for host resumption events.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public class HostResumingEventArgs : EventArgs
{
}
}
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