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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 org.apache.qpid.transport.codec;
using org.apache.qpid.transport.util;
namespace org.apache.qpid.transport.network
{
/// <summary>
/// Disassembler
/// </summary>
public sealed class Disassembler : ISender<IProtocolEvent>, IProtocolDelegate<Object>
{
private readonly IIoSender<MemoryStream> _sender;
private readonly int _maxPayload;
private readonly MemoryStream _header;
private readonly BinaryWriter _writer;
private readonly Object _sendlock = new Object();
[ThreadStatic] static MSEncoder _encoder;
public Disassembler(IIoSender<MemoryStream> sender, int maxFrame)
{
if (maxFrame <= network.Frame.HEADER_SIZE || maxFrame >= 64*1024)
{
throw new Exception(String.Format("maxFrame must be > {0} and < 64K: ", network.Frame.HEADER_SIZE) + maxFrame);
}
_sender = sender;
_maxPayload = maxFrame - network.Frame.HEADER_SIZE;
_header = new MemoryStream(network.Frame.HEADER_SIZE);
_writer = new BinaryWriter(_header);
}
#region Sender Interface
public void Send(IProtocolEvent pevent)
{
pevent.ProcessProtocolEvent(null, this);
}
public void Flush()
{
lock (_sendlock)
{
_sender.Flush();
}
}
public void Close()
{
lock (_sendlock)
{
_sender.Close();
}
}
#endregion
#region ProtocolDelegate<Object> Interface
public void Init(Object v, ProtocolHeader header)
{
lock (_sendlock)
{
_sender.Send(header.ToMemoryStream());
_sender.Flush();
}
}
public void Control(Object v, Method method)
{
InvokeMethod(method, SegmentType.CONTROL);
}
public void Command(Object v, Method method)
{
InvokeMethod(method, SegmentType.COMMAND);
}
public void Error(Object v, ProtocolError error)
{
throw new Exception("Error: " + error);
}
#endregion
#region private
private void Frame(byte flags, byte type, byte track, int channel, int size, MemoryStream buf)
{
lock (_sendlock)
{
_writer.Write(flags);
_writer.Write(type);
_writer.Write(ByteEncoder.GetBigEndian((UInt16)(size + network.Frame.HEADER_SIZE)));
_writer.Write((byte)0);
_writer.Write(track);
_writer.Write(ByteEncoder.GetBigEndian((UInt16)( channel)));
_writer.Write((byte)0);
_writer.Write((byte)0);
_writer.Write((byte)0);
_writer.Write((byte)0);
_sender.Send(_header);
_header.Seek(0, SeekOrigin.Begin);
_sender.Send(buf, size);
}
}
private void Fragment(byte flags, SegmentType type, IProtocolEvent mevent, MemoryStream buf)
{
byte typeb = (byte) type;
byte track = mevent.EncodedTrack == network.Frame.L4 ? (byte) 1 : (byte) 0;
int remaining = (int) buf.Length;
buf.Seek(0, SeekOrigin.Begin);
bool first = true;
while (true)
{
int size = Math.Min(_maxPayload, remaining);
remaining -= size;
byte newflags = flags;
if (first)
{
newflags |= network.Frame.FIRST_FRAME;
first = false;
}
if (remaining == 0)
{
newflags |= network.Frame.LAST_FRAME;
}
Frame(newflags, typeb, track, mevent.Channel, size, buf);
if (remaining == 0)
{
break;
}
}
}
private MSEncoder GetEncoder()
{
if( _encoder == null)
{
_encoder = new MSEncoder(4 * 1024);
}
return _encoder;
}
private void InvokeMethod(Method method, SegmentType type)
{
MSEncoder encoder = GetEncoder();
encoder.Init();
encoder.WriteUint16(method.GetEncodedType());
if (type == SegmentType.COMMAND)
{
if (method.Sync)
{
encoder.WriteUint16(0x0101);
}
else
{
encoder.WriteUint16(0x0100);
}
}
method.Write(_encoder);
MemoryStream methodSeg = encoder.Segment();
byte flags = network.Frame.FIRST_SEG;
bool payload = method.HasPayload();
if (!payload)
{
flags |= network.Frame.LAST_SEG;
}
MemoryStream headerSeg = null;
if (payload)
{
Header hdr = method.Header;
Struct[] structs = hdr.Structs;
foreach (Struct st in structs)
{
encoder.WriteStruct32(st);
}
headerSeg = encoder.Segment();
}
lock (_sendlock)
{
Fragment(flags, type, method, methodSeg);
if (payload)
{
Fragment( 0x0, SegmentType.HEADER, method, headerSeg);
Fragment(network.Frame.LAST_SEG, SegmentType.BODY, method, method.Body);
}
}
}
#endregion
}
}
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