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CachedModel.cs
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CachedModel.cs
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#region License
/*
* Copyright 2002-2010 the original author or authors.
*
* Licensed 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.
*/
#endregion
#region
using System;
using System.Collections;
using System.Collections.Generic;
using Common.Logging;
using RabbitMQ.Client;
using RabbitMQ.Client.Events;
#endregion
namespace Spring.Messaging.Amqp.Rabbit.Connection
{
/// <summary>
/// A cached model.
/// </summary>
/// <author>Mark Pollack</author>
public class CachedModel : IChannelProxy
{
#region Logging Definition
/// <summary>
/// The logger.
/// </summary>
private readonly ILog logger = LogManager.GetLogger(typeof(CachedModel));
#endregion
/// <summary>
/// The target.
/// </summary>
private IModel target;
/// <summary>
/// The model list.
/// </summary>
private LinkedList<IChannelProxy> modelList;
/// <summary>
/// The target monitor.
/// </summary>
private readonly object targetMonitor = new object();
/// <summary>
/// The transactional flag.
/// </summary>
private readonly bool transactional;
/// <summary>
/// The model cache size.
/// </summary>
private int modelCacheSize;
/// <summary>
/// The caching connection factory.
/// </summary>
private CachingConnectionFactory ccf;
/// <summary>
/// Initializes a new instance of the <see cref="CachedModel"/> class.
/// </summary>
/// <param name="targetModel">
/// The target model.
/// </param>
/// <param name="channelList">
/// The channel list.
/// </param>
/// <param name="transactional">
/// The transactional.
/// </param>
/// <param name="ccf">
/// The ccf.
/// </param>
public CachedModel(IModel targetModel, LinkedList<IChannelProxy> channelList, bool transactional, CachingConnectionFactory ccf)
{
this.target = targetModel;
this.modelList = channelList;
this.transactional = transactional;
this.modelCacheSize = ccf.ChannelCacheSize;
this.ccf = ccf;
}
/// <summary>
/// Gets the connection.
/// </summary>
/// <remarks></remarks>
public RabbitMQ.Client.IConnection Connection
{
get { return ((RabbitMQ.Client.Impl.ModelBase)this.GetTargetChannel()).m_session.Connection; }
}
#region Implementation of IChannelProxy
/// <summary>
/// Gets the target, return underlying channel.
/// </summary>
/// <value>
/// The target.
/// </value>
/// <returns>
/// The get target channel.
/// </returns>
public IModel GetTargetChannel()
{
return this.target;
}
#endregion
#region Implementation of IModel
/// <summary>
/// Close action.
/// </summary>
/// <param name="replyCode">
/// The reply code.
/// </param>
/// <param name="replyText">
/// The reply text.
/// </param>
public void Close(ushort replyCode, string replyText)
{
if (this.ccf.Active)
{
// don't pass the call to the underlying target.
lock (this.modelList)
{
if (this.modelList.Count < this.modelCacheSize)
{
this.LogicalClose();
// Remain open in the session list.
return;
}
}
}
// If we get here, we're supposed to shut down.
this.PhysicalClose(replyCode, replyText);
}
/// <summary>
/// Close action.
/// </summary>
public void Close()
{
if (this.ccf.Active)
{
// don't pass the call to the underlying target.
lock (this.modelList)
{
if (this.modelList.Count < this.modelCacheSize)
{
this.LogicalClose();
// Remain open in the session list.
return;
}
}
}
// If we get here, we're supposed to shut down.
this.PhysicalClose();
}
/// <summary>
/// Select the transaction.
/// </summary>
/// <exception cref="InvalidOperationException">
/// </exception>
public void TxSelect()
{
if (!this.transactional)
{
throw new InvalidOperationException("Cannot start transaction on non-transactional channel");
}
this.target.TxSelect();
}
/// <summary>
/// Logical close action.
/// </summary>
private void LogicalClose()
{
if (!this.target.IsOpen)
{
lock (this.targetMonitor)
{
if (!this.target.IsOpen)
{
this.target = null;
return;
}
}
}
// Allow for multiple close calls...
if (!this.modelList.Contains(this))
{
if (this.logger.IsDebugEnabled)
{
this.logger.Debug("Returning cached Session: " + this.target);
}
this.modelList.AddLast(this); // add to end of linked list.
}
}
/// <summary>
/// Physical close action.
/// </summary>
private void PhysicalClose()
{
if (this.logger.IsDebugEnabled)
{
this.logger.Debug("Closing cached Model: " + this.target);
}
if (this.target == null)
{
return;
}
if (this.target.IsOpen)
{
lock (this.targetMonitor)
{
if (this.target.IsOpen)
{
this.target.Close();
}
this.target = null;
}
}
}
/// <summary>
/// Physical close action.
/// </summary>
/// <param name="replyCode">
/// The reply code.
/// </param>
/// <param name="replyText">
/// The reply text.
/// </param>
private void PhysicalClose(ushort replyCode, string replyText)
{
if (this.logger.IsDebugEnabled)
{
this.logger.Debug("Closing cached Model: " + this.target);
}
if (this.target == null)
{
return;
}
if (this.target.IsOpen)
{
lock (this.targetMonitor)
{
if (this.target.IsOpen)
{
this.target.Close(replyCode, replyText);
}
this.target = null;
}
}
}
#endregion
/// <summary>
/// Invoke function with reconnect.
/// </summary>
/// <param name="func">
/// The func.
/// </param>
/// <typeparam name="T">
/// </typeparam>
/// <returns>
/// Type T.
/// </returns>
private T InvokeFunctionWithReconnect<T>(Func<T> func)
{
try
{
lock (this.targetMonitor)
{
if (this.target == null)
{
this.target = this.ccf.CreateBareChannel(this.transactional);
}
}
return func.Invoke();
}
catch (Exception e)
{
if (!this.target.IsOpen)
{
// Basic re-connection logic
this.logger.Debug("Detected closed channel on exception. Re-initializing: " + this.target);
}
lock (this.targetMonitor)
{
if (!this.target.IsOpen)
{
this.target = this.ccf.CreateBareChannel(this.transactional);
}
}
throw;
}
}
/// <summary>
/// Invoke action with reconnect.
/// </summary>
/// <param name="action">
/// The action.
/// </param>
private void InvokeActionWithReconnect(Action action)
{
try
{
lock (this.targetMonitor)
{
if (this.target == null)
{
this.target = this.ccf.CreateBareChannel(this.transactional);
}
}
action.Invoke();
}
catch (Exception e)
{
if (!this.target.IsOpen)
{
// Basic re-connection logic
this.logger.Debug("Detected closed channel on exception. Re-initializing: " + this.target);
}
lock (this.targetMonitor)
{
if (!this.target.IsOpen)
{
this.target = this.ccf.CreateBareChannel(this.transactional);
}
}
throw;
}
}
#region Wrapped invocations of IModel methods to perform reconnect logic
public IBasicProperties CreateBasicProperties()
{
return this.InvokeFunctionWithReconnect(() => this.target.CreateBasicProperties());
}
public IFileProperties CreateFileProperties()
{
return this.InvokeFunctionWithReconnect(() => this.target.CreateFileProperties());
}
public IStreamProperties CreateStreamProperties()
{
return this.InvokeFunctionWithReconnect(() => this.target.CreateStreamProperties());
}
public void ChannelFlow(bool active)
{
this.InvokeActionWithReconnect(() => this.target.ChannelFlow(active));
}
public void ExchangeDeclare(string exchange, string type, bool durable, bool autoDelete, IDictionary arguments)
{
this.InvokeActionWithReconnect(() => this.target.ExchangeDeclare(exchange, type, durable, autoDelete, arguments));
}
public void ExchangeDeclare(string exchange, string type, bool durable)
{
this.InvokeActionWithReconnect(() => this.target.ExchangeDeclare(exchange, type, durable));
}
public void ExchangeDeclare(string exchange, string type)
{
this.InvokeActionWithReconnect(() => this.target.ExchangeDeclare(exchange, type));
}
public void ExchangeDeclarePassive(string exchange)
{
this.InvokeActionWithReconnect(() => this.target.ExchangeDeclarePassive(exchange));
}
public void ExchangeDelete(string exchange, bool ifUnused)
{
this.InvokeActionWithReconnect(() => this.target.ExchangeDelete(exchange, ifUnused));
}
public void ExchangeDelete(string exchange)
{
this.InvokeActionWithReconnect(() => this.target.ExchangeDelete(exchange));
}
public void ExchangeBind(string destination, string source, string routingKey, IDictionary arguments)
{
this.InvokeActionWithReconnect(() => this.target.ExchangeBind(destination, source, routingKey, arguments));
}
public void ExchangeBind(string destination, string source, string routingKey)
{
this.InvokeActionWithReconnect(() => this.target.ExchangeBind(destination, source, routingKey));
}
public void ExchangeUnbind(string destination, string source, string routingKey, IDictionary arguments)
{
this.InvokeActionWithReconnect(() => this.target.ExchangeUnbind(destination, source, routingKey, arguments));
}
public void ExchangeUnbind(string destination, string source, string routingKey)
{
this.InvokeActionWithReconnect(() => this.target.ExchangeUnbind(destination, source, routingKey));
}
public string QueueDeclare()
{
return this.InvokeFunctionWithReconnect(() => this.target.QueueDeclare());
}
public string QueueDeclarePassive(string queue)
{
return this.InvokeFunctionWithReconnect(() => this.target.QueueDeclarePassive(queue));
}
public string QueueDeclare(string queue, bool durable, bool exclusive, bool autoDelete, IDictionary arguments)
{
return this.InvokeFunctionWithReconnect(() => this.target.QueueDeclare(queue, durable, exclusive, autoDelete, arguments));
}
public void QueueBind(string queue, string exchange, string routingKey, IDictionary arguments)
{
this.InvokeActionWithReconnect(() => this.target.QueueBind(queue, exchange, routingKey, arguments));
}
public void QueueBind(string queue, string exchange, string routingKey)
{
this.InvokeActionWithReconnect(() => this.target.QueueBind(queue, exchange, routingKey));
}
public void QueueUnbind(string queue, string exchange, string routingKey, IDictionary arguments)
{
this.InvokeActionWithReconnect(() => this.target.QueueUnbind(queue, exchange, routingKey, arguments));
}
public uint QueuePurge(string queue)
{
return this.InvokeFunctionWithReconnect(() => this.target.QueuePurge(queue));
}
public uint QueueDelete(string queue, bool ifUnused, bool ifEmpty)
{
return this.InvokeFunctionWithReconnect(() => this.target.QueueDelete(queue, ifUnused, ifEmpty));
}
public uint QueueDelete(string queue)
{
return this.InvokeFunctionWithReconnect(() => this.target.QueueDelete(queue));
}
public void ConfirmSelect()
{
this.InvokeActionWithReconnect(() => this.target.ConfirmSelect());
}
public string BasicConsume(string queue, bool noAck, IBasicConsumer consumer)
{
return this.InvokeFunctionWithReconnect(() => this.target.BasicConsume(queue, noAck, consumer));
}
public string BasicConsume(string queue, bool noAck, string consumerTag, IBasicConsumer consumer)
{
return this.InvokeFunctionWithReconnect(() => this.target.BasicConsume(queue, noAck, consumerTag, consumer));
}
public string BasicConsume(string queue, bool noAck, string consumerTag, IDictionary arguments, IBasicConsumer consumer)
{
return this.InvokeFunctionWithReconnect(() => this.target.BasicConsume(queue, noAck, consumerTag, arguments, consumer));
}
public string BasicConsume(string queue, bool noAck, string consumerTag, bool noLocal, bool exclusive, IDictionary arguments, IBasicConsumer consumer)
{
return this.InvokeFunctionWithReconnect(() => this.target.BasicConsume(queue, noAck, consumerTag, noLocal, exclusive, arguments, consumer));
}
public void BasicCancel(string consumerTag)
{
this.InvokeActionWithReconnect(() => this.target.BasicCancel(consumerTag));
}
public void BasicQos(uint prefetchSize, ushort prefetchCount, bool global)
{
this.InvokeActionWithReconnect(() => this.target.BasicQos(prefetchSize, prefetchCount, global));
}
public void BasicPublish(PublicationAddress addr, IBasicProperties basicProperties, byte[] body)
{
this.InvokeActionWithReconnect(() => this.target.BasicPublish(addr, basicProperties, body));
}
public void BasicPublish(string exchange, string routingKey, IBasicProperties basicProperties, byte[] body)
{
this.InvokeActionWithReconnect(() => this.target.BasicPublish(exchange, routingKey, basicProperties, body));
}
public void BasicPublish(string exchange, string routingKey, bool mandatory, bool immediate, IBasicProperties basicProperties, byte[] body)
{
this.InvokeActionWithReconnect(() => this.target.BasicPublish(exchange, routingKey, mandatory, immediate, basicProperties, body));
}
public void BasicAck(ulong deliveryTag, bool multiple)
{
this.InvokeActionWithReconnect(() => this.target.BasicAck(deliveryTag, multiple));
}
public void BasicReject(ulong deliveryTag, bool requeue)
{
this.InvokeActionWithReconnect(() => this.target.BasicReject(deliveryTag, requeue));
}
public void BasicNack(ulong deliveryTag, bool multiple, bool requeue)
{
this.InvokeActionWithReconnect(() => this.target.BasicNack(deliveryTag, multiple, requeue));
}
public void BasicRecover(bool requeue)
{
this.InvokeActionWithReconnect(() => this.target.BasicRecover(requeue));
}
public void BasicRecoverAsync(bool requeue)
{
this.InvokeActionWithReconnect(() => this.target.BasicRecoverAsync(requeue));
}
public BasicGetResult BasicGet(string queue, bool noAck)
{
return this.InvokeFunctionWithReconnect(() => this.target.BasicGet(queue, noAck));
}
public void TxCommit()
{
this.InvokeActionWithReconnect(() => this.target.TxCommit());
}
public void TxRollback()
{
this.InvokeActionWithReconnect(() => this.target.TxRollback());
}
public void DtxSelect()
{
this.InvokeActionWithReconnect(() => this.target.DtxSelect());
}
public void DtxStart(string dtxIdentifier)
{
this.InvokeActionWithReconnect(() => this.target.DtxStart(dtxIdentifier));
}
public void Abort()
{
this.InvokeActionWithReconnect(() => this.target.Abort());
}
public void Abort(ushort replyCode, string replyText)
{
this.InvokeActionWithReconnect(() => this.target.Abort(replyCode, replyText));
}
// TODO - wrap the rest with InvokeAction/Function
/// <summary>
/// Gets or sets DefaultConsumer.
/// </summary>
public IBasicConsumer DefaultConsumer
{
get { return this.target.DefaultConsumer; }
set { this.target.DefaultConsumer = value; }
}
/// <summary>
/// Gets CloseReason.
/// </summary>
public ShutdownEventArgs CloseReason
{
get { return this.target.CloseReason; }
}
/// <summary>
/// Gets a value indicating whether IsOpen.
/// </summary>
public bool IsOpen
{
get { return this.target.IsOpen; }
}
/// <summary>
/// Gets NextPublishSeqNo.
/// </summary>
public ulong NextPublishSeqNo
{
get { return this.target.NextPublishSeqNo; }
}
/// <summary>
/// Model shutdown event handler.
/// </summary>
public event ModelShutdownEventHandler ModelShutdown
{
add
{
this.ModelShutdown += value;
}
remove
{
this.ModelShutdown -= value;
}
}
/// <summary>
/// Basic return event handler.
/// </summary>
public event BasicReturnEventHandler BasicReturn
{
add
{
this.BasicReturn += value;
}
remove
{
this.BasicReturn -= value;
}
}
/// <summary>
/// Basic ack event handler.
/// </summary>
public event BasicAckEventHandler BasicAcks;
/// <summary>
/// Basic nack event handler.
/// </summary>
public event BasicNackEventHandler BasicNacks;
/// <summary>
/// Callback exception event handler.
/// </summary>
public event CallbackExceptionEventHandler CallbackException
{
add
{
this.CallbackException += value;
}
remove
{
this.CallbackException -= value;
}
}
/// <summary>
/// Flow control event handler.
/// </summary>
public event FlowControlEventHandler FlowControl;
/// <summary>
/// Basic recover ok event handler.
/// </summary>
public event BasicRecoverOkEventHandler BasicRecoverOk;
#endregion
/// <summary>
/// Dispose action.
/// </summary>
public void Dispose()
{
this.InvokeActionWithReconnect(() => this.target.Dispose());
}
QueueDeclareOk IModel.QueueDeclare(string queue, bool durable, bool exclusive, bool autoDelete, IDictionary arguments)
{
throw new NotImplementedException();
}
QueueDeclareOk IModel.QueueDeclare()
{
throw new NotImplementedException();
}
QueueDeclareOk IModel.QueueDeclarePassive(string queue)
{
throw new NotImplementedException();
}
public bool WaitForConfirms()
{
throw new NotImplementedException();
}
public void WaitForConfirmsOrDie()
{
throw new NotImplementedException();
}
}
}