/
ConnectionStateTracker.cs
163 lines (146 loc) · 3.88 KB
/
ConnectionStateTracker.cs
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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 Apache.NMS.Stomp.Commands;
using Apache.NMS.Stomp.Transport;
namespace Apache.NMS.Stomp.State
{
/// <summary>
/// Tracks the state of a connection so a newly established transport can be
/// re-initialized to the state that was tracked.
/// </summary>
public class ConnectionStateTracker : CommandVisitorAdapter
{
private static readonly Tracked TRACKED_RESPONSE_MARKER = new Tracked(null);
protected Dictionary<ConnectionId, ConnectionState> connectionStates = new Dictionary<ConnectionId, ConnectionState>();
private bool _restoreConsumers = true;
/// <summary>
/// </summary>
/// <param name="command"></param>
/// <returns>null if the command is not state tracked.</returns>
public Tracked track(Command command)
{
try
{
return (Tracked) command.visit(this);
}
catch(IOException e)
{
throw e;
}
catch(Exception e)
{
throw new IOException(e.Message);
}
}
public void trackBack(Command command)
{
}
public void DoRestore(ITransport transport)
{
// Restore the connections.
foreach(ConnectionState connectionState in connectionStates.Values)
{
transport.Oneway(connectionState.Info);
if(RestoreConsumers)
{
DoRestoreConsumers(transport, connectionState);
}
}
}
/// <summary>
/// </summary>
/// <param name="transport"></param>
/// <param name="connectionState"></param>
protected void DoRestoreConsumers(ITransport transport, ConnectionState connectionState)
{
// Restore the session's consumers
foreach(ConsumerState consumerState in connectionState.ConsumerStates)
{
transport.Oneway(consumerState.Info);
}
}
public override Response processAddConsumer(ConsumerInfo info)
{
if(info != null)
{
SessionId sessionId = info.ConsumerId.ParentId;
if(sessionId != null)
{
ConnectionId connectionId = sessionId.ParentId;
if(connectionId != null)
{
ConnectionState cs = null;
if(connectionStates.TryGetValue(connectionId, out cs))
{
cs.addConsumer(info);
}
}
}
}
return TRACKED_RESPONSE_MARKER;
}
public override Response processRemoveConsumer(ConsumerId id)
{
if(id != null)
{
SessionId sessionId = id.ParentId;
if(sessionId != null)
{
ConnectionId connectionId = sessionId.ParentId;
if(connectionId != null)
{
ConnectionState cs = null;
if(connectionStates.TryGetValue(connectionId, out cs))
{
cs.removeConsumer(id);
}
}
}
}
return TRACKED_RESPONSE_MARKER;
}
public override Response processAddConnection(ConnectionInfo info)
{
if(info != null)
{
connectionStates.Add(info.ConnectionId, new ConnectionState(info));
}
return TRACKED_RESPONSE_MARKER;
}
public override Response processRemoveConnection(ConnectionId id)
{
if(id != null)
{
connectionStates.Remove(id);
}
return TRACKED_RESPONSE_MARKER;
}
public bool RestoreConsumers
{
get
{
return _restoreConsumers;
}
set
{
_restoreConsumers = value;
}
}
}
}