private void CreateWithAsyncInit_CreateOnly(bool readOnly)
{
// create a new message with asynchronous initializer
var message = LogFileMessage.CreateWithAsyncInit(readOnly, out _);
CheckDefaultState(message, false, readOnly);
// check that the message is marked for asynchronous initialization
Assert.True(message.IsAsyncInitPending);
// check whether the message reflects the desired read-only state
Assert.Equal(readOnly, message.IsReadOnly);
}
private async Task CreateWithAsyncInit_FollowedByInitialize(bool readOnly, bool initInSameThread, bool withPropertyChanged)
{
// create a new message with asynchronous initializer
var message = LogFileMessage.CreateWithAsyncInit(readOnly, out var initializer);
CheckDefaultState(message, false, readOnly); // checks IsInitialized
// check that the message is marked for asynchronous initialization
Assert.True(message.IsAsyncInitPending);
// prepare data pulling some information out of the event handler
SynchronizationContext handlerThreadSynchronizationContext = null;
var changedPropertyNames = new List <string>();
var handlerCalledEvent = new ManualResetEventSlim(false);
// the handler that is expected to be called on changes
void PropertyChangedHandler(object sender, PropertyChangedEventArgs e)
{
handlerThreadSynchronizationContext = SynchronizationContext.Current;
changedPropertyNames.Add(e.PropertyName);
handlerCalledEvent.Set();
}
// run test in a separate thread that provides a synchronization context that allows to
// marshal calls into that thread
await mThread.Factory.Run(() => { Assert.NotNull(SynchronizationContext.Current); });
// register the PropertyChanged event
if (withPropertyChanged)
{
await mThread.Factory.Run(() => { message.PropertyChanged += PropertyChangedHandler; });
}
// callback that initializes the message
void InitializeTest()
{
initializer.Initialize(
1,
DateTimeOffset.Parse("2020-01-01T12:00:00+01:00"),
2,
3,
"Log Writer",
"Log Level",
new TagSet("Tag"),
"Application",
"Process",
42,
"Some text");
// check administrative properties
Assert.True(message.IsInitialized);
Assert.False(message.IsAsyncInitPending);
// check message properties
Assert.Equal(1, message.Id);
Assert.Equal(DateTimeOffset.Parse("2020-01-01T12:00:00+01:00"), message.Timestamp);
Assert.Equal(2, message.HighPrecisionTimestamp);
Assert.Equal(3, message.LostMessageCount);
Assert.Equal("Log Writer", message.LogWriterName);
Assert.Equal("Log Level", message.LogLevelName);
Assert.Equal(new TagSet("Tag"), message.Tags);
Assert.Equal("Application", message.ApplicationName);
Assert.Equal("Process", message.ProcessName);
Assert.Equal(42, message.ProcessId);
Assert.Equal("Some text", message.Text);
if (initInSameThread)
{
if (withPropertyChanged)
{
// the event handler should have been called only once in the same thread
// (the event handler is called directly as the registering thread is the same as the thread raising the event)
Assert.True(handlerCalledEvent.IsSet);
Assert.Equal(new string[] { null }, changedPropertyNames.ToArray()); // null => all properties
}
else
{
// the event handler should not have been called
Assert.False(handlerCalledEvent.IsSet);
}
}
}
// initialize the message either in the context of the thread that registered the handler
// or in a different - the current - thread
if (initInSameThread)
{
await mThread.Factory.Run(InitializeTest);
}
else
{
InitializeTest();
}
if (!initInSameThread)
{
// the thread registering the event and the thread initializing the message are different
if (withPropertyChanged)
{
// event handler should run in the context of the thread that registered it
Assert.True(handlerCalledEvent.Wait(1000));
Assert.Same(mThread.Context.SynchronizationContext, handlerThreadSynchronizationContext);
Assert.Equal(new string[] { null }, changedPropertyNames.ToArray());
}
else
{
// the event handler should not have been called
Assert.False(handlerCalledEvent.Wait(1000));
}
}
}
