/// <summary>
/// Initializes a new instance of the <see cref="MultipleInstanceMongoServerProxy"/> class.
/// </summary>
/// <param name="settings">The settings.</param>
/// <param name="instances">The instances.</param>
/// <param name="connectionQueue">The state change queue.</param>
/// <param name="connectionAttempt">The connection attempt.</param>
/// <remarks>This constructor is used when the instances have already been instructed to connect.</remarks>
protected MultipleInstanceMongoServerProxy(MongoServerSettings settings, IEnumerable <MongoServerInstance> instances, BlockingQueue <MongoServerInstance> connectionQueue, int connectionAttempt)
{
_state = MongoServerState.Connecting;
_settings = settings;
_connectedInstances = new ConnectedInstanceCollection();
_connectionAttempt = connectionAttempt;
_outstandingInstanceConnections = connectionQueue.Count;
ThreadPool.QueueUserWorkItem(_ =>
{
while (connectionQueue.Count > 0)
{
connectionQueue.Dequeue();
Interlocked.Decrement(ref _outstandingInstanceConnections);
}
});
// It's important to have our own copy of this list because it might get modified during iteration.
_instances = instances.ToList();
foreach (var instance in instances)
{
instance.StateChanged += InstanceStateChanged;
ProcessInstanceStateChange(instance);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="ShardedMongoServerProxy"/> class.
/// </summary>
/// <param name="server">The server.</param>
/// <param name="instances">The instances.</param>
/// <param name="connectionQueue">The state change queue.</param>
/// <param name="connectionAttempt">The connection attempt.</param>
/// <remarks>This constructor is used when the instances have already been instructed to connect.</remarks>
protected MultipleInstanceMongoServerProxy(MongoServer server, IEnumerable<MongoServerInstance> instances, BlockingQueue<MongoServerInstance> connectionQueue, int connectionAttempt)
{
_state = MongoServerState.Connecting;
_server = server;
_connectedInstances = new ConnectedInstanceCollection();
_connectionAttempt = connectionAttempt;
_outstandingInstanceConnections = connectionQueue.Count;
ThreadPool.QueueUserWorkItem(_ =>
{
while (connectionQueue.Count > 0)
{
var instance = connectionQueue.Dequeue();
Interlocked.Decrement(ref _outstandingInstanceConnections);
}
});
// It's important to have our own copy of this list because it might get modified during iteration.
_instances = instances.ToList();
foreach (var instance in instances)
{
instance.StateChanged += InstanceStateChanged;
ProcessInstanceStateChange(instance);
}
}
// protected methods
/// <summary>
/// Chooses the server instance.
/// </summary>
/// <param name="connectedInstances">The connected instances.</param>
/// <param name="readPreference">The read preference.</param>
/// <returns>A MongoServerInstance.</returns>
protected override MongoServerInstance ChooseServerInstance(ConnectedInstanceCollection connectedInstances, ReadPreference readPreference)
{
var instancesWithPingTime = connectedInstances.GetAllInstances();
if (instancesWithPingTime.Count == 0)
{
return(null);
}
else if (instancesWithPingTime.Count == 1)
{
return(instancesWithPingTime[0].Instance);
}
else
{
var secondaryAcceptableLatency = Settings.SecondaryAcceptableLatency;
var minPingTime = instancesWithPingTime[0].CachedAveragePingTime;
var maxPingTime = minPingTime + secondaryAcceptableLatency;
var n = instancesWithPingTime.Count(i => i.CachedAveragePingTime <= maxPingTime);
lock (_randomLock)
{
var index = _random.Next(n);
return(instancesWithPingTime[index].Instance); // return random instance
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="ShardedMongoServerProxy"/> class.
/// </summary>
/// <param name="server">The server.</param>
protected MultipleInstanceMongoServerProxy(MongoServer server)
{
_server = server;
_connectedInstances = new ConnectedInstanceCollection();
_instances = new List<MongoServerInstance>();
MakeInstancesMatchAddresses(server.Settings.Servers);
}
/// <summary>
/// Initializes a new instance of the <see cref="MultipleInstanceMongoServerProxy"/> class.
/// </summary>
/// <param name="settings">The settings.</param>
protected MultipleInstanceMongoServerProxy(MongoServerSettings settings)
{
_settings = settings;
_connectedInstances = new ConnectedInstanceCollection();
_instances = new List <MongoServerInstance>();
MakeInstancesMatchAddresses(settings.Servers);
}
/// <summary>
/// Initializes a new instance of the <see cref="MultipleInstanceMongoServerProxy"/> class.
/// </summary>
/// <param name="sequentialId">The sequential id.</param>
/// <param name="settings">The settings.</param>
protected MultipleInstanceMongoServerProxy(int sequentialId, MongoServerProxySettings settings)
{
_sequentialId = sequentialId;
_settings = settings;
_connectedInstances = new ConnectedInstanceCollection();
_instances = new List<MongoServerInstance>();
MakeInstancesMatchAddresses(settings.Servers);
}
/// <summary>
/// Initializes a new instance of the <see cref="ShardedMongoServerProxy"/> class.
/// </summary>
/// <param name="server">The server.</param>
protected MultipleConnectionMongoServerProxy(MongoServer server)
{
_server = server;
_instances = new List<MongoServerInstance>();
_connectedInstances = new ConnectedInstanceCollection();
_stateChangeQueue = new BlockingQueue<MongoServerInstance>();
MakeInstancesMatchAddresses(server.Settings.Servers);
_stateChangeThread = new Thread(ProcessStateChanges);
_stateChangeThread.IsBackground = true;
_stateChangeThread.Start();
}
/// <summary>
/// Initializes a new instance of the <see cref="ShardedMongoServerProxy"/> class.
/// </summary>
/// <param name="server">The server.</param>
/// <param name="instances">The instances.</param>
/// <param name="stateChangedQueue">The state change queue.</param>
/// <param name="connectionAttempt">The connection attempt.</param>
protected MultipleConnectionMongoServerProxy(MongoServer server, IEnumerable<MongoServerInstance> instances, BlockingQueue<MongoServerInstance> stateChangedQueue, int connectionAttempt)
{
_server = server;
_instances = new List<MongoServerInstance>();
_connectedInstances = new ConnectedInstanceCollection();
_connectionAttempt = connectionAttempt;
_stateChangeQueue = stateChangedQueue;
foreach (var instance in instances)
{
AddInstance(instance);
}
_stateChangeThread = new Thread(ProcessStateChanges);
_stateChangeThread.IsBackground = true;
_stateChangeThread.Start();
}
// protected methods
protected override MongoServerInstance ChooseServerInstance(ConnectedInstanceCollection connectedInstances, ReadPreference readPreference)
{
var secondaryAcceptableLatency = Server.Settings.SecondaryAcceptableLatency;
switch (readPreference.ReadPreferenceMode)
{
case ReadPreferenceMode.Primary:
return(connectedInstances.GetPrimary());
case ReadPreferenceMode.PrimaryPreferred:
var primary = connectedInstances.GetPrimary();
if (primary != null)
{
return(primary);
}
else
{
return(GetMatchingInstance(connectedInstances.GetSecondaries(), readPreference, secondaryAcceptableLatency));
}
case ReadPreferenceMode.Secondary:
return(GetMatchingInstance(connectedInstances.GetSecondaries(), readPreference, secondaryAcceptableLatency));
case ReadPreferenceMode.SecondaryPreferred:
var secondary = GetMatchingInstance(connectedInstances.GetSecondaries(), readPreference, secondaryAcceptableLatency);
if (secondary != null)
{
return(secondary);
}
else
{
return(connectedInstances.GetPrimary());
}
case ReadPreferenceMode.Nearest:
return(GetMatchingInstance(connectedInstances.GetPrimaryAndSecondaries(), readPreference, secondaryAcceptableLatency));
default:
throw new MongoInternalException("Invalid ReadPreferenceMode.");
}
}
// protected methods
protected override MongoServerInstance ChooseServerInstance(ConnectedInstanceCollection connectedInstances, ReadPreference readPreference)
{
var secondaryAcceptableLatency = Settings.SecondaryAcceptableLatency;
switch (readPreference.ReadPreferenceMode)
{
case ReadPreferenceMode.Primary:
return connectedInstances.GetPrimary();
case ReadPreferenceMode.PrimaryPreferred:
var primary = connectedInstances.GetPrimary();
if (primary != null)
{
return primary;
}
else
{
return GetMatchingInstance(connectedInstances.GetSecondaries(), readPreference, secondaryAcceptableLatency);
}
case ReadPreferenceMode.Secondary:
return GetMatchingInstance(connectedInstances.GetSecondaries(), readPreference, secondaryAcceptableLatency);
case ReadPreferenceMode.SecondaryPreferred:
var secondary = GetMatchingInstance(connectedInstances.GetSecondaries(), readPreference, secondaryAcceptableLatency);
if (secondary != null)
{
return secondary;
}
else
{
return connectedInstances.GetPrimary();
}
case ReadPreferenceMode.Nearest:
return GetMatchingInstance(connectedInstances.GetPrimaryAndSecondaries(), readPreference, secondaryAcceptableLatency);
default:
throw new MongoInternalException("Invalid ReadPreferenceMode.");
}
}
// protected methods
/// <summary>
/// Chooses the server instance.
/// </summary>
/// <param name="connectedInstances">The connected instances.</param>
/// <param name="readPreference">The read preference.</param>
/// <returns>A MongoServerInstance.</returns>
protected override MongoServerInstance ChooseServerInstance(ConnectedInstanceCollection connectedInstances, ReadPreference readPreference)
{
var instancesWithPingTime = connectedInstances.GetAllInstances();
if (instancesWithPingTime.Count == 0)
{
return null;
}
else if (instancesWithPingTime.Count == 1)
{
return instancesWithPingTime[0].Instance;
}
else
{
var minPingTime = instancesWithPingTime[0].CachedAveragePingTime;
var maxPingTime = minPingTime + readPreference.SecondaryAcceptableLatency;
var n = instancesWithPingTime.Count(i => i.CachedAveragePingTime <= maxPingTime);
lock (_randomLock)
{
var index = _random.Next(n);
return instancesWithPingTime[index].Instance; // return random instance
}
}
}
// protected methods /// <summary> /// Chooses the server instance. /// </summary> /// <param name="connectedInstances">The connected instances.</param> /// <param name="readPreference">The read preference.</param> /// <returns>A MongoServerInstance.</returns> protected abstract MongoServerInstance ChooseServerInstance(ConnectedInstanceCollection connectedInstances, ReadPreference readPreference);
// protected methods
protected override MongoServerInstance ChooseServerInstance(ConnectedInstanceCollection connectedInstances, ReadPreference readPreference)
{
return connectedInstances.ChooseServerInstance(readPreference);
}
// protected methods /// <summary> /// Chooses the server instance. /// </summary> /// <param name="connectedInstances">The connected instances.</param> /// <param name="readPreference">The read preference.</param> /// <returns>A MongoServerInstance.</returns> protected abstract MongoServerInstance ChooseServerInstance(ConnectedInstanceCollection connectedInstances, ReadPreference readPreference);
// protected methods
/// <summary>
/// Chooses the server instance.
/// </summary>
/// <param name="connectedInstances">The connected instances.</param>
/// <param name="readPreference">The read preference.</param>
/// <returns>A MongoServerInstance.</returns>
protected override MongoServerInstance ChooseServerInstance(ConnectedInstanceCollection connectedInstances, ReadPreference readPreference)
{
return(connectedInstances.ChooseServerInstance(ReadPreference.Primary));
}
