private Task CreateWriteTask(CancellationToken cancellationToken, NonBlockingFileWriter writer)
{
return(Task.Run(async() =>
{
int i = 0;
while (!cancellationToken.IsCancellationRequested)
{
writer.Write("test" + i);
await Task.Delay(i % 50 + 10);
i++;
}
}));
}
public async Task TestFileWriter()
{
string filename = Guid.NewGuid().ToString();
NonBlockingFileWriter writer = new NonBlockingFileWriter(filename);
await AssertInTimeout(() => File.Exists(filename) == false);
await AssertInTimeout(() => writer.HasFailed == false);
await AssertInTimeout(() => writer.IsEnabled);
await AssertInTimeout(() => writer.IsDisposed);
await AssertInTimeout(() => writer.IsEmpty);
for (int j = 0; j < 3; j++)
{
writer.IsEnabled = true;
for (int i = 0; i < 50; i++)
{
writer.Write("test" + i);
}
await AssertInTimeout(() => File.Exists(filename));
await AssertInTimeout(() => writer.HasFailed == false);
await AssertInTimeout(() => writer.IsEnabled);
await AssertInTimeout(() => writer.IsDisposed == false);
await AssertInTimeout(() => writer.IsEmpty);
writer.IsEnabled = false;
for (int i = 0; i < 50; i++)
{
writer.Write("test" + i);
}
await AssertInTimeout(() => writer.HasFailed == false);
await AssertInTimeout(() => writer.IsEnabled == false);
await AssertInTimeout(() => writer.IsDisposed);
await AssertInTimeout(() => writer.IsEmpty);
File.Delete(filename);
writer.Write("should not write");
await AssertInTimeout(() => writer.HasFailed == false);
await AssertInTimeout(() => writer.IsEnabled == false);
await AssertInTimeout(() => writer.IsDisposed);
await AssertInTimeout(() => writer.IsEmpty);
}
var cancellationTokenSource = new CancellationTokenSource();
var token = cancellationTokenSource.Token;
var concurrentWrites = new[]
{
CreateWriteTask(token, writer), CreateWriteTask(token, writer), CreateWriteTask(token, writer),
CreateWriteTask(token, writer)
};
for (int i = 0; i < 3; i++)
{
writer.IsEnabled = true;
await Task.Delay(50);
writer.IsEnabled = false;
await AssertInTimeout(() => writer.HasFailed == false);
await AssertInTimeout(() => writer.IsEnabled == false);
await AssertInTimeout(() => writer.IsDisposed);
await AssertInTimeout(() => writer.IsEmpty);
}
writer.IsEnabled = true;
writer.ThrowWrite = true;
await AssertInTimeout(() => writer.HasFailed);
await AssertInTimeout(() => writer.IsEnabled);
await AssertInTimeout(() => writer.IsDisposed);
cancellationTokenSource.Cancel();
await Task.WhenAll(concurrentWrites);
await AssertInTimeout(() => writer.IsEmpty);
File.Delete(filename);
writer.Write("should not write");
Assert.False(File.Exists(filename));
}
