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using System.IO;
using System.Text;
namespace Firebase.Database.Streaming
{
/// <summary>
/// When a regular <see cref="StreamReader" /> is used in a UWP app its <see cref="StreamReader.ReadLine" /> method
/// tends to take a long
/// time for data larger then 2 KB. This extremly simple implementation of <see cref="TextReader" /> can be used
/// instead to boost performance
/// in your UWP app. Use <see cref="FirebaseOptions" /> to inject an instance of this class into your
/// <see cref="FirebaseClient" />.
/// </summary>
public class NonBlockingStreamReader : TextReader
{
private const int DefaultBufferSize = 16000;
private readonly byte[] buffer;
private readonly int bufferSize;
private readonly Stream stream;
private string cachedData;
public NonBlockingStreamReader(Stream stream, int bufferSize = DefaultBufferSize)
{
this.stream = stream;
this.bufferSize = bufferSize;
buffer = new byte[bufferSize];
cachedData = string.Empty;
}
public override string ReadLine()
{
var currentString = TryGetNewLine();
while (currentString == null)
{
var read = stream.Read(buffer, 0, bufferSize);
var str = Encoding.UTF8.GetString(buffer, 0, read);
cachedData += str;
currentString = TryGetNewLine();
}
return currentString;
}
private string TryGetNewLine()
{
var newLine = cachedData.IndexOf('\n');
if (newLine >= 0)
{
var r = cachedData.Substring(0, newLine + 1);
cachedData = cachedData.Remove(0, r.Length);
return r.Trim();
}
return null;
}
}
}
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