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// Licensed to the Apache Software Foundation(ASF) under one
// or more contributor license agreements.See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace Thrift.Transports.Client
{
// ReSharper disable once InconsistentNaming
public class TBufferedClientTransport : TClientTransport
{
private readonly int _bufSize;
private readonly MemoryStream _inputBuffer = new MemoryStream(0);
private readonly MemoryStream _outputBuffer = new MemoryStream(0);
private readonly TClientTransport _transport;
private bool _isDisposed;
//TODO: should support only specified input transport?
public TBufferedClientTransport(TClientTransport transport, int bufSize = 1024)
{
if (bufSize <= 0)
{
throw new ArgumentOutOfRangeException(nameof(bufSize), "Buffer size must be a positive number.");
}
_transport = transport ?? throw new ArgumentNullException(nameof(transport));
_bufSize = bufSize;
}
public TClientTransport UnderlyingTransport
{
get
{
CheckNotDisposed();
return _transport;
}
}
public override bool IsOpen => !_isDisposed && _transport.IsOpen;
public override async Task OpenAsync(CancellationToken cancellationToken)
{
CheckNotDisposed();
await _transport.OpenAsync(cancellationToken);
}
public override void Close()
{
CheckNotDisposed();
_transport.Close();
}
public override async Task<int> ReadAsync(byte[] buffer, int offset, int length,
CancellationToken cancellationToken)
{
//TODO: investigate how it should work correctly
CheckNotDisposed();
ValidateBufferArgs(buffer, offset, length);
if (!IsOpen)
{
throw new TTransportException(TTransportException.ExceptionType.NotOpen);
}
if (_inputBuffer.Capacity < _bufSize)
{
_inputBuffer.Capacity = _bufSize;
}
var got = await _inputBuffer.ReadAsync(buffer, offset, length, cancellationToken);
if (got > 0)
{
return got;
}
_inputBuffer.Seek(0, SeekOrigin.Begin);
_inputBuffer.SetLength(_inputBuffer.Capacity);
ArraySegment<byte> bufSegment;
_inputBuffer.TryGetBuffer(out bufSegment);
// investigate
var filled = await _transport.ReadAsync(bufSegment.Array, 0, (int) _inputBuffer.Length, cancellationToken);
_inputBuffer.SetLength(filled);
if (filled == 0)
{
return 0;
}
return await ReadAsync(buffer, offset, length, cancellationToken);
}
public override async Task WriteAsync(byte[] buffer, int offset, int length, CancellationToken cancellationToken)
{
CheckNotDisposed();
ValidateBufferArgs(buffer, offset, length);
if (!IsOpen)
{
throw new TTransportException(TTransportException.ExceptionType.NotOpen);
}
// Relative offset from "off" argument
var writtenCount = 0;
if (_outputBuffer.Length > 0)
{
var capa = (int) (_outputBuffer.Capacity - _outputBuffer.Length);
var writeSize = capa <= length ? capa : length;
await _outputBuffer.WriteAsync(buffer, offset, writeSize, cancellationToken);
writtenCount += writeSize;
if (writeSize == capa)
{
//ArraySegment<byte> bufSegment;
//_outputBuffer.TryGetBuffer(out bufSegment);
var data = _outputBuffer.ToArray();
//await _transport.WriteAsync(bufSegment.Array, cancellationToken);
await _transport.WriteAsync(data, cancellationToken);
_outputBuffer.SetLength(0);
}
}
while (length - writtenCount >= _bufSize)
{
await _transport.WriteAsync(buffer, offset + writtenCount, _bufSize, cancellationToken);
writtenCount += _bufSize;
}
var remain = length - writtenCount;
if (remain > 0)
{
if (_outputBuffer.Capacity < _bufSize)
{
_outputBuffer.Capacity = _bufSize;
}
await _outputBuffer.WriteAsync(buffer, offset + writtenCount, remain, cancellationToken);
}
}
public override async Task FlushAsync(CancellationToken cancellationToken)
{
CheckNotDisposed();
if (!IsOpen)
{
throw new TTransportException(TTransportException.ExceptionType.NotOpen);
}
if (_outputBuffer.Length > 0)
{
//ArraySegment<byte> bufSegment;
var data = _outputBuffer.ToArray(); // TryGetBuffer(out bufSegment);
await _transport.WriteAsync(data /*bufSegment.Array*/, cancellationToken);
_outputBuffer.SetLength(0);
}
await _transport.FlushAsync(cancellationToken);
}
private void CheckNotDisposed()
{
if (_isDisposed)
{
throw new ObjectDisposedException(nameof(_transport));
}
}
// IDisposable
protected override void Dispose(bool disposing)
{
if (!_isDisposed)
{
if (disposing)
{
_inputBuffer?.Dispose();
_outputBuffer?.Dispose();
_transport?.Dispose();
}
}
_isDisposed = true;
}
}
}
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