diff options
Diffstat (limited to 'src/jaegertracing/thrift/lib/csharp/src/Transport/TFramedTransport.cs')
| -rw-r--r-- | src/jaegertracing/thrift/lib/csharp/src/Transport/TFramedTransport.cs | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/src/jaegertracing/thrift/lib/csharp/src/Transport/TFramedTransport.cs b/src/jaegertracing/thrift/lib/csharp/src/Transport/TFramedTransport.cs new file mode 100644 index 000000000..a746a3223 --- /dev/null +++ b/src/jaegertracing/thrift/lib/csharp/src/Transport/TFramedTransport.cs @@ -0,0 +1,205 @@ +/** + * 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; + +namespace Thrift.Transport +{ + public class TFramedTransport : TTransport, IDisposable + { + private readonly TTransport transport; + private readonly MemoryStream writeBuffer = new MemoryStream(1024); + private readonly MemoryStream readBuffer = new MemoryStream(1024); + + private const int HeaderSize = 4; + private readonly byte[] headerBuf = new byte[HeaderSize]; + + public class Factory : TTransportFactory + { + public override TTransport GetTransport(TTransport trans) + { + return new TFramedTransport(trans); + } + } + + public TFramedTransport(TTransport transport) + { + if (transport == null) + throw new ArgumentNullException("transport"); + this.transport = transport; + InitWriteBuffer(); + } + + public override void Open() + { + CheckNotDisposed(); + transport.Open(); + } + + public override bool IsOpen + { + get + { + // We can legitimately throw here but be nice a bit. + // CheckNotDisposed(); + return !_IsDisposed && transport.IsOpen; + } + } + + public override void Close() + { + CheckNotDisposed(); + transport.Close(); + } + + public override int Read(byte[] buf, int off, int len) + { + CheckNotDisposed(); + ValidateBufferArgs(buf, off, len); + if (!IsOpen) + throw new TTransportException(TTransportException.ExceptionType.NotOpen); + int got = readBuffer.Read(buf, off, len); + if (got > 0) + { + return got; + } + + // Read another frame of data + ReadFrame(); + + return readBuffer.Read(buf, off, len); + } + + private void ReadFrame() + { + transport.ReadAll(headerBuf, 0, HeaderSize); + int size = DecodeFrameSize(headerBuf); + + readBuffer.SetLength(size); + readBuffer.Seek(0, SeekOrigin.Begin); + byte[] buff = readBuffer.GetBuffer(); + transport.ReadAll(buff, 0, size); + } + + public override void Write(byte[] buf, int off, int len) + { + CheckNotDisposed(); + ValidateBufferArgs(buf, off, len); + if (!IsOpen) + throw new TTransportException(TTransportException.ExceptionType.NotOpen); + if (writeBuffer.Length + (long)len > (long)int.MaxValue) + Flush(); + writeBuffer.Write(buf, off, len); + } + + private void InternalFlush() + { + CheckNotDisposed(); + if (!IsOpen) + throw new TTransportException(TTransportException.ExceptionType.NotOpen); + byte[] buf = writeBuffer.GetBuffer(); + int len = (int)writeBuffer.Length; + int data_len = len - HeaderSize; + if (data_len < 0) + throw new System.InvalidOperationException(); // logic error actually + + // Inject message header into the reserved buffer space + EncodeFrameSize(data_len, buf); + + // Send the entire message at once + transport.Write(buf, 0, len); + + InitWriteBuffer(); + } + + public override void Flush() + { + CheckNotDisposed(); + InternalFlush(); + + transport.Flush(); + } + + public override IAsyncResult BeginFlush(AsyncCallback callback, object state) + { + CheckNotDisposed(); + InternalFlush(); + + return transport.BeginFlush( callback, state); + } + + public override void EndFlush(IAsyncResult asyncResult) + { + transport.EndFlush( asyncResult); + } + + private void InitWriteBuffer() + { + // Reserve space for message header to be put right before sending it out + writeBuffer.SetLength(HeaderSize); + writeBuffer.Seek(0, SeekOrigin.End); + } + + private static void EncodeFrameSize(int frameSize, byte[] buf) + { + buf[0] = (byte)(0xff & (frameSize >> 24)); + buf[1] = (byte)(0xff & (frameSize >> 16)); + buf[2] = (byte)(0xff & (frameSize >> 8)); + buf[3] = (byte)(0xff & (frameSize)); + } + + private static int DecodeFrameSize(byte[] buf) + { + return + ((buf[0] & 0xff) << 24) | + ((buf[1] & 0xff) << 16) | + ((buf[2] & 0xff) << 8) | + ((buf[3] & 0xff)); + } + + + private void CheckNotDisposed() + { + if (_IsDisposed) + throw new ObjectDisposedException("TFramedTransport"); + } + + #region " IDisposable Support " + private bool _IsDisposed; + + // IDisposable + protected override void Dispose(bool disposing) + { + if (!_IsDisposed) + { + if (disposing) + { + if (readBuffer != null) + readBuffer.Dispose(); + if (writeBuffer != null) + writeBuffer.Dispose(); + if (transport != null) + transport.Dispose(); + } + } + _IsDisposed = true; + } + #endregion + } +} |