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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.Diagnostics;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace Thrift.Transport
{
// ReSharper disable once InconsistentNaming
public class TBufferedTransport : TTransport
{
private readonly int DesiredBufferSize;
private readonly Client.TMemoryBufferTransport ReadBuffer = new Client.TMemoryBufferTransport(1024);
private readonly Client.TMemoryBufferTransport WriteBuffer = new Client.TMemoryBufferTransport(1024);
private readonly TTransport InnerTransport;
private bool IsDisposed;
public class Factory : TTransportFactory
{
public override TTransport GetTransport(TTransport trans)
{
return new TBufferedTransport(trans);
}
}
//TODO: should support only specified input transport?
public TBufferedTransport(TTransport transport, int bufSize = 1024)
{
if (bufSize <= 0)
{
throw new ArgumentOutOfRangeException(nameof(bufSize), "Buffer size must be a positive number.");
}
InnerTransport = transport ?? throw new ArgumentNullException(nameof(transport));
DesiredBufferSize = bufSize;
if (DesiredBufferSize != ReadBuffer.Capacity)
ReadBuffer.Capacity = DesiredBufferSize;
if (DesiredBufferSize != WriteBuffer.Capacity)
WriteBuffer.Capacity = DesiredBufferSize;
}
public TTransport UnderlyingTransport
{
get
{
CheckNotDisposed();
return InnerTransport;
}
}
public override bool IsOpen => !IsDisposed && InnerTransport.IsOpen;
public override async Task OpenAsync(CancellationToken cancellationToken)
{
CheckNotDisposed();
await InnerTransport.OpenAsync(cancellationToken);
}
public override void Close()
{
CheckNotDisposed();
InnerTransport.Close();
}
public override async ValueTask<int> ReadAsync(byte[] buffer, int offset, int length, CancellationToken cancellationToken)
{
CheckNotDisposed();
ValidateBufferArgs(buffer, offset, length);
if (!IsOpen)
{
throw new TTransportException(TTransportException.ExceptionType.NotOpen);
}
// do we have something buffered?
var count = ReadBuffer.Length - ReadBuffer.Position;
if (count > 0)
{
return await ReadBuffer.ReadAsync(buffer, offset, length, cancellationToken);
}
// does the request even fit into the buffer?
// Note we test for >= instead of > to avoid nonsense buffering
if (length >= ReadBuffer.Capacity)
{
return await InnerTransport.ReadAsync(buffer, offset, length, cancellationToken);
}
// buffer a new chunk of bytes from the underlying transport
ReadBuffer.Length = ReadBuffer.Capacity;
ArraySegment<byte> bufSegment;
ReadBuffer.TryGetBuffer(out bufSegment);
ReadBuffer.Length = await InnerTransport.ReadAsync(bufSegment.Array, 0, bufSegment.Count, cancellationToken);
ReadBuffer.Position = 0;
// deliver the bytes
return await ReadBuffer.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);
}
// enough space left in buffer?
var free = WriteBuffer.Capacity - WriteBuffer.Length;
if (length > free)
{
ArraySegment<byte> bufSegment;
WriteBuffer.TryGetBuffer(out bufSegment);
await InnerTransport.WriteAsync(bufSegment.Array, 0, bufSegment.Count, cancellationToken);
WriteBuffer.SetLength(0);
}
// do the data even fit into the buffer?
// Note we test for < instead of <= to avoid nonsense buffering
if (length < WriteBuffer.Capacity)
{
await WriteBuffer.WriteAsync(buffer, offset, length, cancellationToken);
return;
}
// write thru
await InnerTransport.WriteAsync(buffer, offset, length, cancellationToken);
}
public override async Task FlushAsync(CancellationToken cancellationToken)
{
CheckNotDisposed();
if (!IsOpen)
{
throw new TTransportException(TTransportException.ExceptionType.NotOpen);
}
if (WriteBuffer.Length > 0)
{
ArraySegment<byte> bufSegment;
WriteBuffer.TryGetBuffer(out bufSegment);
await InnerTransport.WriteAsync(bufSegment.Array, 0, bufSegment.Count, cancellationToken);
WriteBuffer.SetLength(0);
}
await InnerTransport.FlushAsync(cancellationToken);
}
private void CheckNotDisposed()
{
if (IsDisposed)
{
throw new ObjectDisposedException(nameof(InnerTransport));
}
}
// IDisposable
protected override void Dispose(bool disposing)
{
if (!IsDisposed)
{
if (disposing)
{
ReadBuffer?.Dispose();
WriteBuffer?.Dispose();
InnerTransport?.Dispose();
}
}
IsDisposed = true;
}
}
}
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