public void NotCollectedIfSubscriberIsNotTheCallbackTarget()
{
WeakReference wr = null;
new Action(() =>
{
var subscriber = new TestSubcriber();
wr = new WeakReference(subscriber);
// This creates a closure, so the callback target is not 'subscriber', but an instancce of a compiler generated class
// So MC has to keep a strong reference to it, and 'subscriber' won't be collectable
SafeMessagingCenter.Subscribe <TestPublisher>(subscriber, "test", p => subscriber.SetSuccess());
})();
GC.Collect();
GC.WaitForPendingFinalizers();
Assert.True(wr.IsAlive); // The closure in Subscribe should be keeping the subscriber alive
Assert.NotNull(wr.Target as TestSubcriber);
Assert.False(((TestSubcriber)wr.Target).Successful);
var pub = new TestPublisher();
pub.Test();
Assert.True(((TestSubcriber)wr.Target).Successful); // Since it's still alive, the subscriber should still have received the message and updated the property
}
public void Unsubscribe()
{
string sentMessage = null;
SafeMessagingCenter.Subscribe <SafeMessagingCenterTests, string>(this, "SimpleTest", (sender, args) => sentMessage = args);
SafeMessagingCenter.Unsubscribe <SafeMessagingCenterTests, string>(this, "SimpleTest");
SafeMessagingCenter.Send(this, "SimpleTest", "My Message");
Assert.Null(sentMessage);
}
public void NoArgUnsubscribe()
{
bool sentMessage = false;
SafeMessagingCenter.Subscribe <SafeMessagingCenterTests>(this, "SimpleTest", (sender) => sentMessage = true);
SafeMessagingCenter.Unsubscribe <SafeMessagingCenterTests>(this, "SimpleTest");
SafeMessagingCenter.Send(this, "SimpleTest", "My Message");
Assert.False(sentMessage);
}
public void NoArgSingleSubscriber()
{
bool sentMessage = false;
SafeMessagingCenter.Subscribe <SafeMessagingCenterTests>(this, "SimpleTest", sender => sentMessage = true);
SafeMessagingCenter.Send(this, "SimpleTest");
Assert.True(sentMessage);
SafeMessagingCenter.Unsubscribe <SafeMessagingCenterTests>(this, "SimpleTest");
}
public void SubscriberShouldBeCollected()
{
new Action(() =>
{
var subscriber = new TestSubcriber();
SafeMessagingCenter.Subscribe <TestPublisher>(subscriber, "test", p => Assert.True(false)); //ie Assert.Fail
})();
GC.Collect();
GC.WaitForPendingFinalizers();
var pub = new TestPublisher();
pub.Test(); // Assert.Fail() shouldn't be called, because the TestSubcriber object should have ben GCed
}
public void Filter()
{
string sentMessage = null;
SafeMessagingCenter.Subscribe <SafeMessagingCenterTests, string>(this, "SimpleTest", callback: (sender, args) => sentMessage = args, source: this);
SafeMessagingCenter.Send(new SafeMessagingCenterTests(), "SimpleTest", "My Message");
Assert.Null(sentMessage);
SafeMessagingCenter.Send(this, "SimpleTest", "My Message");
Assert.Equal("My Message", sentMessage);
SafeMessagingCenter.Unsubscribe <SafeMessagingCenterTests, string>(this, "SimpleTest");
}
public void MultipleSubscribersOfTheSameClass()
{
var sub1 = new object();
var sub2 = new object();
string args2 = null;
const string message = "message";
SafeMessagingCenter.Subscribe <SafeMessagingCenterTests, string>(sub1, message, (sender, args) => { });
SafeMessagingCenter.Subscribe <SafeMessagingCenterTests, string>(sub2, message, (sender, args) => args2 = args);
SafeMessagingCenter.Unsubscribe <SafeMessagingCenterTests, string>(sub1, message);
SafeMessagingCenter.Send(this, message, "Testing");
Assert.Equal("Testing", args2); //unsubscribing sub1 should not unsubscribe sub2
}
public void NoArgFilter()
{
bool sentMessage = false;
SafeMessagingCenter.Subscribe(this, "SimpleTest", (sender) => sentMessage = true, source: this);
SafeMessagingCenter.Send(new SafeMessagingCenterTests(), "SimpleTest");
Assert.False(sentMessage);
SafeMessagingCenter.Send(this, "SimpleTest");
Assert.True(sentMessage);
SafeMessagingCenter.Unsubscribe <SafeMessagingCenterTests>(this, "SimpleTest");
}
public void StaticCallback()
{
int i = 4;
_subscriber = new TestSubcriber(); // Using a class member so it doesn't get optimized away in Release build
SafeMessagingCenter.Subscribe <TestPublisher>(_subscriber, "test", p => MessagingCenterTestsCallbackSource.Increment(ref i));
GC.Collect();
GC.WaitForPendingFinalizers();
var pub = new TestPublisher();
pub.Test();
Assert.True(i == 5, "The static method should have incremented 'i'");
}
public void MultiSubscriber()
{
var sub1 = new object();
var sub2 = new object();
string sentMessage1 = null;
string sentMessage2 = null;
SafeMessagingCenter.Subscribe <SafeMessagingCenterTests, string>(sub1, "SimpleTest", (sender, args) => sentMessage1 = args);
SafeMessagingCenter.Subscribe <SafeMessagingCenterTests, string>(sub2, "SimpleTest", (sender, args) => sentMessage2 = args);
SafeMessagingCenter.Send(this, "SimpleTest", "My Message");
Assert.Equal("My Message", sentMessage1);
Assert.Equal("My Message", sentMessage2);
SafeMessagingCenter.Unsubscribe <SafeMessagingCenterTests, string>(sub1, "SimpleTest");
SafeMessagingCenter.Unsubscribe <SafeMessagingCenterTests, string>(sub2, "SimpleTest");
}
public void NoArgMultiSubscriber()
{
var sub1 = new object();
var sub2 = new object();
bool sentMessage1 = false;
bool sentMessage2 = false;
SafeMessagingCenter.Subscribe <SafeMessagingCenterTests>(sub1, "SimpleTest", (sender) => sentMessage1 = true);
SafeMessagingCenter.Subscribe <SafeMessagingCenterTests>(sub2, "SimpleTest", (sender) => sentMessage2 = true);
SafeMessagingCenter.Send(this, "SimpleTest");
Assert.True(sentMessage1);
Assert.True(sentMessage2);
SafeMessagingCenter.Unsubscribe <SafeMessagingCenterTests>(sub1, "SimpleTest");
SafeMessagingCenter.Unsubscribe <SafeMessagingCenterTests>(sub2, "SimpleTest");
}
public void NothingShouldBeCollected()
{
var success = false;
_subscriber = new TestSubcriber(); // Using a class member so it doesn't get optimized away in Release build
var source = new MessagingCenterTestsCallbackSource();
SafeMessagingCenter.Subscribe <TestPublisher>(_subscriber, "test", p => source.SuccessCallback(ref success));
GC.Collect();
GC.WaitForPendingFinalizers();
var pub = new TestPublisher();
pub.Test();
Assert.True(success); // TestCallbackSource.SuccessCallback() should be invoked to make success == true
}
public void ThrowOnNullArgs()
{
Assert.Throws <ArgumentNullException>(() => SafeMessagingCenter.Subscribe <SafeMessagingCenterTests, string>(null, "Foo", (sender, args) => { }));
Assert.Throws <ArgumentNullException>(() => SafeMessagingCenter.Subscribe <SafeMessagingCenterTests, string>(this, null, (sender, args) => { }));
Assert.Throws <ArgumentNullException>(() => SafeMessagingCenter.Subscribe <SafeMessagingCenterTests, string>(this, "Foo", null));
Assert.Throws <ArgumentNullException>(() => SafeMessagingCenter.Subscribe <SafeMessagingCenterTests>(null, "Foo", (sender) => { }));
Assert.Throws <ArgumentNullException>(() => SafeMessagingCenter.Subscribe <SafeMessagingCenterTests>(this, null, (sender) => { }));
Assert.Throws <ArgumentNullException>(() => SafeMessagingCenter.Subscribe(this, "Foo", (Action <SafeMessagingCenterTests>)null));
Assert.Throws <ArgumentNullException>(() => SafeMessagingCenter.Send <SafeMessagingCenterTests, string>(null, "Foo", "Bar"));
Assert.Throws <ArgumentNullException>(() => SafeMessagingCenter.Send <SafeMessagingCenterTests, string>(this, null, "Bar"));
Assert.Throws <ArgumentNullException>(() => SafeMessagingCenter.Send <SafeMessagingCenterTests>(null, "Foo"));
Assert.Throws <ArgumentNullException>(() => SafeMessagingCenter.Send <SafeMessagingCenterTests>(this, null));
Assert.Throws <ArgumentNullException>(() => SafeMessagingCenter.Unsubscribe <SafeMessagingCenterTests>(null, "Foo"));
Assert.Throws <ArgumentNullException>(() => SafeMessagingCenter.Unsubscribe <SafeMessagingCenterTests>(this, null));
Assert.Throws <ArgumentNullException>(() => SafeMessagingCenter.Unsubscribe <SafeMessagingCenterTests, string>(null, "Foo"));
Assert.Throws <ArgumentNullException>(() => SafeMessagingCenter.Unsubscribe <SafeMessagingCenterTests, string>(this, null));
}
public void UnsubscribeInCallback()
{
int messageCount = 0;
var subscriber1 = new object();
var subscriber2 = new object();
SafeMessagingCenter.Subscribe <SafeMessagingCenterTests>(subscriber1, "SimpleTest", (sender) =>
{
messageCount++;
SafeMessagingCenter.Unsubscribe <SafeMessagingCenterTests>(subscriber2, "SimpleTest");
});
SafeMessagingCenter.Subscribe <SafeMessagingCenterTests>(subscriber2, "SimpleTest", (sender) =>
{
messageCount++;
SafeMessagingCenter.Unsubscribe <SafeMessagingCenterTests>(subscriber1, "SimpleTest");
});
SafeMessagingCenter.Send(this, "SimpleTest");
Assert.Equal(1, messageCount);
}
public void SubscribeToTestMessages()
{
SafeMessagingCenter.Subscribe <TestPublisher>(this, "test", p => SetSuccess());
}