| // 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; |
| } |
| } |
| } |