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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 Logger = org.apache.qpid.transport.util.Logger;
namespace org.apache.qpid.transport.network.io
{
/// <summary>
/// IoReceiver
/// </summary>
public sealed class IoReceiver : IReceiver<ReceivedPayload<MemoryStream>>
{
private static readonly Logger log = Logger.Get(typeof(IoReceiver));
private readonly int m_bufferSize;
private readonly Stream m_bufStream;
private readonly int m_timeout;
private readonly Thread m_thread;
private bool m_closed;
private readonly Object m_objectLock = new object();
// the event raised when a buffer is read from the wire
event EventHandler<ReceivedPayload<MemoryStream>> ReceivedBuffer;
event EventHandler<ExceptionArgs> ExceptionReading;
event EventHandler ReceiverClosed;
event EventHandler<ReceivedPayload<MemoryStream>> IReceiver<ReceivedPayload<MemoryStream>>.Received
{
add
{
lock (m_objectLock)
{
ReceivedBuffer += value;
}
}
remove
{
lock (m_objectLock)
{
ReceivedBuffer -= value;
}
}
}
event EventHandler<ExceptionArgs> IReceiver<ReceivedPayload<MemoryStream>>.Exception
{
add
{
lock (m_objectLock)
{
ExceptionReading += value;
}
}
remove
{
lock (m_objectLock)
{
ExceptionReading -= value;
}
}
}
event EventHandler IReceiver<ReceivedPayload<MemoryStream>>.Closed
{
add
{
lock (m_objectLock)
{
ReceiverClosed += value;
}
}
remove
{
lock (m_objectLock)
{
ReceiverClosed -= value;
}
}
}
public IoReceiver(Stream stream, int bufferSize, int timeout)
{
m_bufferSize = bufferSize;
m_bufStream = stream;
m_timeout = timeout;
m_thread = new Thread(Go);
m_thread.Name = String.Format("IoReceiver - {0}", stream);
m_thread.IsBackground = true;
m_thread.Start();
}
public void Close()
{
Mutex mut = new Mutex();
mut.WaitOne();
if (!m_closed)
{
m_closed = true;
try
{
log.Debug("Receiver closing");
m_bufStream.Close();
m_thread.Join(m_timeout);
if (m_thread.IsAlive)
{
throw new TransportException("join timed out");
}
}
catch (ThreadInterruptedException e)
{
throw new TransportException(e);
}
catch (IOException e)
{
throw new TransportException(e);
}
}
mut.ReleaseMutex();
}
void Go()
{
// create a BufferedStream on top of the NetworkStream.
int threshold = m_bufferSize/2;
byte[] buffer = new byte[m_bufferSize];
try
{
int read;
int offset = 0;
ReceivedPayload<MemoryStream> payload = new ReceivedPayload<MemoryStream>();
while ((read = m_bufStream.Read(buffer, offset, m_bufferSize - offset)) > 0)
{
MemoryStream memStream = new MemoryStream(buffer, offset, read);
if (ReceivedBuffer != null)
{
// call the event
payload.Payload = memStream;
ReceivedBuffer(this, payload);
}
offset += read;
if (offset > threshold)
{
offset = 0;
buffer = new byte[m_bufferSize];
}
}
log.Debug("Receiver thread terminating");
}
catch (Exception t)
{
if (ExceptionReading != null)
{
ExceptionReading(this, new ExceptionArgs(t));
}
}
finally
{
if (ReceiverClosed != null)
{
ReceiverClosed(this, new EventArgs());
}
}
}
}
}
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