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using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
using System.Threading;
using System;
using System.Diagnostics;
using System.Threading.Tasks;
using Xamarin.Forms.Maps;
#if UITEST
using Xamarin.Forms.Core.UITests;
using Xamarin.UITest;
using NUnit.Framework;
#endif
namespace Xamarin.Forms.Controls.Issues
{
[Preserve(AllMembers = true)]
#if UITEST
[Category(UITestCategories.Maps)]
#endif
[Issue(IssueTracker.Bugzilla, 39489, "Memory leak when using NavigationPage with Maps", PlatformAffected.Android | PlatformAffected.iOS)]
public class Bugzilla39489 : TestNavigationPage
{
protected override void Init()
{
PushAsync(new Bz39489Content());
}
#if UITEST
protected override bool Isolate => true;
[Test]
public async Task Bugzilla39489Test()
{
// Original bug report (https://bugzilla.xamarin.com/show_bug.cgi?id=39489) had a crash (OOM) after 25-30
// page loads. Obviously it's going to depend heavily on the device and amount of available memory, but
// if this starts failing before 50 we'll know we've sprung another serious leak
int iterations = 50;
for (int n = 0; n < iterations; n++)
{
RunningApp.WaitForElement(q => q.Marked("New Page"));
RunningApp.Tap(q => q.Marked("New Page"));
RunningApp.WaitForElement(q => q.Marked("New Page"));
await Task.Delay(1000);
RunningApp.Back();
}
}
#endif
}
public class Bz39489Map : Map
{
static int s_count;
public Bz39489Map()
{
Interlocked.Increment(ref s_count);
Debug.WriteLine($"++++++++ Bz39489Map : Constructor, count is {s_count}");
}
~Bz39489Map()
{
Interlocked.Decrement(ref s_count);
Debug.WriteLine($"-------- Bz39489Map: Destructor, count is {s_count}");
}
}
[Preserve(AllMembers = true)]
public class Bz39489Content : ContentPage
{
static int s_count;
public Bz39489Content()
{
Interlocked.Increment(ref s_count);
Debug.WriteLine($">>>>> Bz39489Content Bz39489Content 54: Constructor, count is {s_count}");
var button = new Button { Text = "New Page" };
var gcbutton = new Button { Text = "GC" };
var map = new Bz39489Map();
button.Clicked += Button_Clicked;
gcbutton.Clicked += GCbutton_Clicked;
Content = new StackLayout { Children = { button, gcbutton, map } };
}
void GCbutton_Clicked(object sender, EventArgs e)
{
System.Diagnostics.Debug.WriteLine(">>>>>>>> Running Garbage Collection");
GC.Collect();
GC.WaitForPendingFinalizers();
System.Diagnostics.Debug.WriteLine($">>>>>>>> GC.GetTotalMemory = {GC.GetTotalMemory(true):n0}");
}
void Button_Clicked(object sender, EventArgs e)
{
Navigation.PushAsync(new Bz39489Content());
}
~Bz39489Content()
{
Interlocked.Decrement(ref s_count);
Debug.WriteLine($">>>>> Bz39489Content ~Bz39489Content 82: Destructor, count is {s_count}");
}
}
}
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