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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.Collections.Generic;
using System.IO;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.Text;
using System.Threading;
using org.apache.qpid.client;
using org.apache.qpid.transport;
using org.apache.qpid.transport.util;
namespace org.apache.qpid.wcf.model
{
internal sealed class QpidInputChannel : QpidInputChannelBase
{
private static readonly Logger _log = Logger.get(typeof (QpidInputChannel));
private readonly QpidTransportBindingElement _bindingElement;
private readonly MessageEncoder _encoder;
private readonly ClientSession _session;
private readonly string _queueName;
private BlockingQueue _queue;
private bool _closed = false;
public QpidInputChannel(BindingContext context, ClientSession session, EndpointAddress address)
: base(context, address)
{
_bindingElement = context.Binding.Elements.Find<QpidTransportBindingElement>();
var encoderElem = context.BindingParameters.Find<MessageEncodingBindingElement>();
if (encoderElem != null)
{
_encoder = encoderElem.CreateMessageEncoderFactory().Encoder;
}
_session = session;
_queueName = address.Uri.ToString();
_queue = new BlockingQueue();
}
public override System.ServiceModel.Channels.Message Receive(TimeSpan timeout)
{
_session.messageFlow("myDest", MessageCreditUnit.MESSAGE, 1);
_session.sync();
IMessage m = _queue.Dequeue();
System.ServiceModel.Channels.Message result = null;
if (m != null)
{
var reader = new BinaryReader(m.Body, Encoding.UTF8);
var body = new byte[m.Body.Length - m.Body.Position];
reader.Read(body, 0, body.Length);
try
{
result = _encoder.ReadMessage(new MemoryStream(body),
(int) _bindingElement.MaxReceivedMessageSize);
}
catch(Exception e)
{
Console.WriteLine(e.StackTrace);
}
result.Headers.To = LocalAddress.Uri;
var ack = new RangeSet();
// ack this message
ack.add(m.Id);
_session.messageAccept(ack);
_session.sync();
}
else
{
if(! _closed )
{
return Receive(timeout);
}
}
return result;
}
public override bool TryReceive(TimeSpan timeout, out System.ServiceModel.Channels.Message message)
{
message = Receive(timeout);
return message != null;
}
public override bool WaitForMessage(TimeSpan timeout)
{
throw new NotImplementedException();
}
public override void Close(TimeSpan timeout)
{
_closed = true;
_queue = null;
}
public override void Open(TimeSpan timeout)
{
if (State != CommunicationState.Created && State != CommunicationState.Closed)
throw new InvalidOperationException(string.Format("Cannot open the channel from the {0} state.", State));
OnOpening();
var qr = (QueueQueryResult) _session.queueQuery(_queueName).Result;
if (qr.getQueue() == null)
{
// create the queue
_session.queueDeclare(_queueName, null, null);
}
// bind the queue
_session.exchangeBind(_queueName, "amq.direct", _queueName, null);
var myListener = new WCFListener(_queue);
_session.attachMessageListener(myListener, "myDest");
_session.messageSubscribe(_queueName, "myDest", MessageAcceptMode.EXPLICIT, MessageAcquireMode.PRE_ACQUIRED,
null,
0, null);
// issue credits
_session.messageSetFlowMode("myDest", MessageFlowMode.WINDOW);
_session.messageFlow("myDest", MessageCreditUnit.BYTE, ClientSession.MESSAGE_FLOW_MAX_BYTES);
_session.sync();
OnOpened();
}
}
internal class WCFListener : IMessageListener
{
private static readonly Logger _log = Logger.get(typeof (WCFListener));
private readonly BlockingQueue _q;
public WCFListener(BlockingQueue q)
{
_q = q;
}
public void messageTransfer(IMessage m)
{
_log.debug("message received by listener");
_q.Enqueue(m);
}
}
internal class BlockingQueue
{
private int _count;
private readonly Queue<IMessage> _queue = new Queue<IMessage>();
public IMessage Dequeue(TimeSpan timeout)
{
lock (_queue)
{
DateTime start = DateTime.Now;
long elapsed = 0;
while (_count <= 0 && elapsed < timeout.Milliseconds)
{
Monitor.Wait(_queue, new TimeSpan(timeout.Milliseconds - elapsed));
elapsed = DateTime.Now.Subtract(start).Milliseconds;
}
if (_count > 0)
{
_count--;
return _queue.Dequeue();
}
return null;
}
}
public IMessage Dequeue()
{
lock (_queue)
{
while (_count <= 0)
{
Monitor.Wait(_queue);
}
if (_count > 0)
{
_count--;
return _queue.Dequeue();
}
return null;
}
}
public void Enqueue(IMessage data)
{
if (data != null)
{
lock (_queue)
{
_queue.Enqueue(data);
_count++;
Monitor.Pulse(_queue);
}
}
}
}
}
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