// constructors
/// <summary>
/// Initializes a new instance of the <see cref="MongoServerInstance"/> class.
/// </summary>
/// <param name="settings">The settings.</param>
/// <param name="address">The address.</param>
internal MongoServerInstance(MongoServerSettings settings, MongoServerAddress address)
{
_settings = settings;
_address = address;
_sequentialId = Interlocked.Increment(ref __nextSequentialId);
_state = MongoServerState.Disconnected;
_serverInfo = new ServerInformation
{
MaxDocumentSize = MongoDefaults.MaxDocumentSize,
MaxMessageLength = MongoDefaults.MaxMessageLength,
InstanceType = MongoServerInstanceType.Unknown
};
_connectionPool = new MongoConnectionPool(this);
_pingTimeAggregator = new PingTimeAggregator(5);
_permanentlyDisconnected = false;
// Console.WriteLine("MongoServerInstance[{0}]: {1}", sequentialId, address);
_stateVerificationAcquireConnectionOptions = new MongoConnectionPool.AcquireConnectionOptions
{
OkToAvoidWaitingByCreatingNewConnection = false,
OkToExceedMaxConnectionPoolSize = true,
OkToExceedWaitQueueSize = true,
WaitQueueTimeout = TimeSpan.FromSeconds(2)
};
}
/// <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);
}
}
private void InstanceStateChanged(
object sender,
object args
)
{
lock (instances) {
if (instances.Any(i => i.State == MongoServerState.Connected && i.IsPrimary))
{
// Console.WriteLine("Server state: Connected");
state = MongoServerState.Connected;
return;
}
if (settings.SlaveOk)
{
if (instances.Any(i => i.State == MongoServerState.Connected && (i.IsSecondary || i.IsPassive)))
{
// Console.WriteLine("Server state: Connected");
state = MongoServerState.Connected;
return;
}
}
if (instances.Any(i => i.State == MongoServerState.Connecting))
{
// Console.WriteLine("Server state: Connecting");
state = MongoServerState.Connecting;
return;
}
// Console.WriteLine("Server state: Disconnected");
state = MongoServerState.Disconnected;
}
}
/// <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);
}
}
/// <remarks>This method must be called outside of a lock.</remarks>
private void SetState(MongoServerState newState, ServerInformation newServerInfo)
{
bool raiseChangedEvent = false;
lock (_serverInstanceLock)
{
if (_state != newState)
{
_state = newState;
raiseChangedEvent = true;
}
if (newState == MongoServerState.Disconnected)
{
_connectionPool.Clear();
}
if (_serverInfo != newServerInfo && _serverInfo.IsDifferentFrom(newServerInfo))
{
_serverInfo = newServerInfo;
raiseChangedEvent = true;
}
}
if (raiseChangedEvent)
{
OnStateChanged();
}
}
/// <summary>
/// Disconnects this instance.
/// </summary>
internal void Disconnect()
{
// Console.WriteLine("MongoServerInstance[{0}]: Disconnect called.", sequentialId);
lock (_serverInstanceLock)
{
if (_stateVerificationTimer != null)
{
_stateVerificationTimer.Dispose();
_stateVerificationTimer = null;
}
if (_state == MongoServerState.Disconnecting || _state == MongoServerState.Disconnected)
{
return;
}
// set the state here because SetState raises an event that should not be raised while holding a lock
_state = MongoServerState.Disconnecting;
}
// we know for certain state has just changed.
OnStateChanged();
try
{
_connectionPool.Clear();
}
finally
{
SetState(MongoServerState.Disconnected);
}
}
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="DiscoveringMongoServerProxy"/> class.
/// </summary>
/// <param name="sequentialId">The sequential id.</param>
/// <param name="settings">The settings.</param>
public DiscoveringMongoServerProxy(int sequentialId, MongoServerProxySettings settings)
{
_state = MongoServerState.Disconnected;
_sequentialId = sequentialId;
_settings = settings;
_instances = settings.Servers.Select(a => new MongoServerInstance(settings, a)).ToList().AsReadOnly();
}
/// <summary>
/// Determines the state of the server.
/// </summary>
/// <param name="currentState">State of the current.</param>
/// <param name="instances">The instances.</param>
/// <returns>The server state.</returns>
protected override MongoServerState DetermineServerState(MongoServerState currentState, IEnumerable <MongoServerInstance> instances)
{
if (!instances.Any())
{
return(MongoServerState.Disconnected);
}
// the order of the tests is significant
// and resolves ambiguities when more than one state might match
if (currentState == MongoServerState.Disconnected)
{
return(MongoServerState.Disconnected);
}
else if (currentState == MongoServerState.Disconnecting)
{
if (instances.All(i => i.State == MongoServerState.Disconnected))
{
return(MongoServerState.Disconnected);
}
return(MongoServerState.Disconnecting);
}
else
{
if (instances.Any(i => i.State == MongoServerState.Connected))
{
return(MongoServerState.Connected);
}
return(MongoServerState.Connecting);
}
}
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="MongoServerInstance"/> class.
/// </summary>
/// <param name="settings">The settings.</param>
/// <param name="address">The address.</param>
internal MongoServerInstance(MongoServerSettings settings, MongoServerAddress address)
{
_settings = settings;
_address = address;
_sequentialId = Interlocked.Increment(ref __nextSequentialId);
_state = MongoServerState.Disconnected;
_serverInfo = new ServerInformation
{
MaxDocumentSize = MongoDefaults.MaxDocumentSize,
MaxMessageLength = MongoDefaults.MaxMessageLength,
InstanceType = MongoServerInstanceType.Unknown
};
_connectionPool = new MongoConnectionPool(this);
_pingTimeAggregator = new PingTimeAggregator(5);
_permanentlyDisconnected = false;
// Console.WriteLine("MongoServerInstance[{0}]: {1}", sequentialId, address);
_stateVerificationAcquireConnectionOptions = new MongoConnectionPool.AcquireConnectionOptions
{
OkToAvoidWaitingByCreatingNewConnection = false,
OkToExceedMaxConnectionPoolSize = true,
OkToExceedWaitQueueSize = true,
WaitQueueTimeout = TimeSpan.FromSeconds(2)
};
}
/// <summary>
/// Disconnects the server.
/// </summary>
public void Disconnect()
{
lock (_lock)
{
if (_state == MongoServerState.Disconnected || _state == MongoServerState.Disconnecting)
{
return;
}
_state = MongoServerState.Disconnecting;
try
{
_connectedInstances.Clear();
foreach (var instance in _instances)
{
try
{
instance.Disconnect();
}
catch { } // ignore disconnection errors
}
}
finally
{
_state = MongoServerState.Disconnected;
}
}
}
internal void ClearInstances()
{
lock (instances) {
instances.ForEach(i => { i.StateChanged -= InstanceStateChanged; });
instances.Clear();
state = MongoServerState.Disconnected;
}
}
/// <summary>
/// Connects this instance.
/// </summary>
internal void Connect()
{
// Console.WriteLine("MongoServerInstance[{0}]: Connect() called.", sequentialId);
lock (_serverInstanceLock)
{
if (_permanentlyDisconnected || _state == MongoServerState.Connecting || _state == MongoServerState.Connected)
{
return;
}
_connectException = null;
// set the state manually here because SetState raises an event that shouldn't be raised
// while holding a lock.
_state = MongoServerState.Connecting;
}
// We know for certain that the state just changed
OnStateChanged();
try
{
var connection = _connectionPool.AcquireConnection(null);
try
{
Ping(connection);
LookupServerInformation(connection);
}
finally
{
_connectionPool.ReleaseConnection(connection);
}
SetState(MongoServerState.Connected);
}
catch (Exception ex)
{
lock (_serverInstanceLock)
{
_connectException = ex;
}
_connectionPool.Clear();
Interlocked.Exchange(ref _connectException, ex);
SetState(MongoServerState.Disconnected);
throw;
}
finally
{
lock (_serverInstanceLock)
{
if (_stateVerificationTimer == null)
{
_stateVerificationTimer = new Timer(o => StateVerificationTimerCallback(), null, TimeSpan.FromSeconds(10), TimeSpan.FromSeconds(10));
}
}
}
}
private MongoServerState state; // always use property to set value so event gets raised
#endregion
#region constructors
internal MongoServerInstance(
MongoServer server,
MongoServerAddress address
) {
this.server = server;
this.address = address;
this.maxDocumentSize = MongoDefaults.MaxDocumentSize;
this.maxMessageLength = MongoDefaults.MaxMessageLength;
this.state = MongoServerState.Disconnected;
}
internal void Connect(
bool slaveOk
)
{
if (state != MongoServerState.Disconnected)
{
var message = string.Format("MongoServerInstance.Connect called when state is: {0}", state);
throw new InvalidOperationException(message);
}
State = MongoServerState.Connecting;
connectException = null;
try {
endPoint = address.ToIPEndPoint(server.Settings.AddressFamily);
var connectionPool = new MongoConnectionPool(this);
try {
var connection = connectionPool.AcquireConnection(null);
try {
try {
var isMasterCommand = new CommandDocument("ismaster", 1);
isMasterResult = connection.RunCommand("admin.$cmd", QueryFlags.SlaveOk, isMasterCommand);
} catch (MongoCommandException ex) {
isMasterResult = ex.CommandResult;
throw;
}
isPrimary = isMasterResult.Response["ismaster", false].ToBoolean();
isSecondary = isMasterResult.Response["secondary", false].ToBoolean();
isPassive = isMasterResult.Response["passive", false].ToBoolean();
isArbiter = isMasterResult.Response["arbiterOnly", false].ToBoolean();
if (!isPrimary && !slaveOk)
{
throw new MongoConnectionException("Server is not a primary and SlaveOk is false");
}
maxDocumentSize = isMasterResult.Response["maxBsonObjectSize", MongoDefaults.MaxDocumentSize].ToInt32();
maxMessageLength = Math.Max(MongoDefaults.MaxMessageLength, maxDocumentSize + 1024); // derived from maxDocumentSize
} finally {
connectionPool.ReleaseConnection(connection);
}
} catch {
connectionPool.Close();
throw;
}
State = MongoServerState.Connected;
this.connectionPool = connectionPool;
} catch (Exception ex) {
State = MongoServerState.Disconnected;
connectException = ex;
throw;
}
}
private MongoServerState _state; // always use property to set value so event gets raised
// constructors
internal MongoServerInstance(MongoServer server, MongoServerAddress address)
{
_server = server;
_address = address;
_sequentialId = Interlocked.Increment(ref __nextSequentialId);
_maxDocumentSize = MongoDefaults.MaxDocumentSize;
_maxMessageLength = MongoDefaults.MaxMessageLength;
_state = MongoServerState.Disconnected;
_connectionPool = new MongoConnectionPool(this);
// Console.WriteLine("MongoServerInstance[{0}]: {1}", sequentialId, address);
}
private MongoServerState _state; // always use property to set value so event gets raised
// constructors
internal MongoServerInstance(MongoServer server, MongoServerAddress address)
{
_server = server;
_address = address;
_sequentialId = Interlocked.Increment(ref __nextSequentialId);
_maxDocumentSize = MongoDefaults.MaxDocumentSize;
_maxMessageLength = MongoDefaults.MaxMessageLength;
_state = MongoServerState.Disconnected;
_connectionPool = new MongoConnectionPool(this);
// Console.WriteLine("MongoServerInstance[{0}]: {1}", sequentialId, address);
}
internal void SetState(MongoServerState state)
{
lock (_serverInstanceLock)
{
if (_state != state)
{
_state = state;
OnStateChanged();
}
}
}
/// <summary>
/// Connects to the server. Normally there is no need to call this method as
/// the driver will connect to the server automatically when needed.
/// </summary>
/// <param name="timeout">How long to wait before timing out.</param>
public virtual void Connect(
TimeSpan timeout
)
{
lock (serverLock) {
if (state != MongoServerState.Connected)
{
state = MongoServerState.Connecting;
try {
switch (settings.ConnectionMode)
{
case ConnectionMode.Direct:
var directConnector = new DirectConnector(this);
directConnector.Connect(timeout);
primaryConnectionPool = new MongoConnectionPool(this, directConnector.Connection);
secondaryConnectionPools = null;
replicaSet = null;
maxDocumentSize = directConnector.MaxDocumentSize;
maxMessageLength = directConnector.MaxMessageLength;
break;
case ConnectionMode.ReplicaSet:
var replicaSetConnector = new ReplicaSetConnector(this);
replicaSetConnector.Connect(timeout);
primaryConnectionPool = new MongoConnectionPool(this, replicaSetConnector.PrimaryConnection);
if (settings.SlaveOk && replicaSetConnector.SecondaryConnections.Count > 0)
{
secondaryConnectionPools = new List <MongoConnectionPool>();
foreach (var connection in replicaSetConnector.SecondaryConnections)
{
var secondaryConnectionPool = new MongoConnectionPool(this, connection);
secondaryConnectionPools.Add(secondaryConnectionPool);
}
}
else
{
secondaryConnectionPools = null;
}
replicaSet = replicaSetConnector.ReplicaSet;
maxDocumentSize = replicaSetConnector.MaxDocumentSize;
maxMessageLength = replicaSetConnector.MaxMessageLength;
break;
default:
throw new MongoInternalException("Invalid ConnectionMode");
}
state = MongoServerState.Connected;
} catch {
state = MongoServerState.Disconnected;
throw;
}
}
}
}
private MongoServerState state; // always use property to set value so event gets raised
#endregion
#region constructors
internal MongoServerInstance(
MongoServer server,
MongoServerAddress address
)
{
this.server = server;
this.address = address;
this.maxDocumentSize = MongoDefaults.MaxDocumentSize;
this.maxMessageLength = MongoDefaults.MaxMessageLength;
this.state = MongoServerState.Disconnected;
}
// constructors
internal MongoServerInstance(MongoServer server, MongoServerAddress address)
{
this.server = server;
this.address = address;
this.sequentialId = Interlocked.Increment(ref nextSequentialId);
this.maxDocumentSize = MongoDefaults.MaxDocumentSize;
this.maxMessageLength = MongoDefaults.MaxMessageLength;
this.state = MongoServerState.Disconnected;
this.connectionPool = new MongoConnectionPool(this);
this.tags = new HashSet<string>();
// Console.WriteLine("MongoServerInstance[{0}]: {1}", sequentialId, address);
}
internal void Disconnect()
{
if (state != MongoServerState.Disconnected)
{
try {
connectionPool.Close();
connectionPool = null;
} finally {
State = MongoServerState.Disconnected;
}
}
}
/// <summary>
/// Connects to the instances respecting the timeout and readPreference.
/// </summary>
/// <param name="timeout">The timeout.</param>
/// <param name="readPreference">The read preference.</param>
public void Connect(TimeSpan timeout, ReadPreference readPreference)
{
try
{
EnsureInstanceManager(timeout);
}
catch
{
_state = MongoServerState.Disconnected;
throw;
}
_serverProxy.Connect(timeout, readPreference);
}
/// <summary>
/// Sets the state.
/// </summary>
/// <param name="state">The state.</param>
internal void SetState(MongoServerState state)
{
lock (_serverInstanceLock)
{
if (_state == state)
{
return;
}
_state = state;
}
OnStateChanged();
}
internal void SetState(MongoServerState state, bool isPrimary, bool isSecondary, bool isPassive, bool isArbiter)
{
lock (serverInstanceLock)
{
if (this.state != state || this.isPrimary != isPrimary || this.isSecondary != isSecondary || this.isPassive != isPassive || this.isArbiter != isArbiter)
{
this.state = state;
this.isPrimary = isPrimary;
this.isSecondary = isSecondary;
this.isPassive = isPassive;
this.isArbiter = isArbiter;
OnStateChanged();
}
}
}
// private methods
private void EnsureInstanceManager(TimeSpan timeout)
{
if (_serverProxy == null)
{
lock (_lock)
{
if (_serverProxy == null)
{
_connectionAttempt++;
_state = MongoServerState.Connecting;
Discover(timeout);
}
}
}
}
internal void Disconnect()
{
if (state != MongoServerState.Disconnected)
{
try {
// if we fail during Connect the connectionPool field will still be null
if (connectionPool != null)
{
connectionPool.Close();
connectionPool = null;
}
} finally {
State = MongoServerState.Disconnected;
}
}
}
/// <summary>
/// Connects to the instances respecting the timeout and readPreference.
/// </summary>
/// <param name="timeout">The timeout.</param>
/// <param name="readPreference">The read preference.</param>
public void Connect(TimeSpan timeout, ReadPreference readPreference)
{
var timeoutAt = DateTime.UtcNow + timeout;
while (DateTime.UtcNow < timeoutAt)
{
if (ChooseServerInstance(_connectedInstances, readPreference) != null)
{
return;
}
if (Interlocked.CompareExchange(ref _outstandingInstanceConnections, 0, 0) > 0)
{
Thread.Sleep(TimeSpan.FromMilliseconds(20));
continue;
}
lock (_lock)
{
// test this again (kinda like the double lock check pattern). This value may
// be different and we don't want to issue another round of connects needlessly.
if (Interlocked.CompareExchange(ref _outstandingInstanceConnections, 0, 0) > 0)
{
Thread.Sleep(TimeSpan.FromMilliseconds(20));
continue;
}
// if we are already fully connected and an instance still isn't chosen,
// then one simply doesn't exist, so we'll break immediately and throw a
// connection exception.
if (_state == MongoServerState.Connected)
{
break;
}
_state = MongoServerState.Connecting;
_connectionAttempt++;
foreach (var instance in _instances)
{
ConnectInstance(instance);
}
}
}
ThrowConnectionException(readPreference);
}
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="MongoServerInstance"/> class.
/// </summary>
/// <param name="server">The server.</param>
/// <param name="address">The address.</param>
internal MongoServerInstance(MongoServer server, MongoServerAddress address)
{
_server = server;
_address = address;
_sequentialId = Interlocked.Increment(ref __nextSequentialId);
_state = MongoServerState.Disconnected;
_serverInfo = new ServerInformation
{
MaxDocumentSize = MongoDefaults.MaxDocumentSize,
MaxMessageLength = MongoDefaults.MaxMessageLength,
InstanceType = MongoServerInstanceType.Unknown
};
_connectionPool = new MongoConnectionPool(this);
_pingTimeAggregator = new PingTimeAggregator(5);
_permanentlyDisconnected = false;
// Console.WriteLine("MongoServerInstance[{0}]: {1}", sequentialId, address);
}
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="MongoServerInstance"/> class.
/// </summary>
/// <param name="settings">The settings.</param>
/// <param name="address">The address.</param>
internal MongoServerInstance(MongoServerSettings settings, MongoServerAddress address)
{
_settings = settings;
_address = address;
_sequentialId = Interlocked.Increment(ref __nextSequentialId);
_state = MongoServerState.Disconnected;
_serverInfo = new ServerInformation
{
MaxDocumentSize = MongoDefaults.MaxDocumentSize,
MaxMessageLength = MongoDefaults.MaxMessageLength,
InstanceType = MongoServerInstanceType.Unknown
};
_connectionPool = new MongoConnectionPool(this);
_pingTimeAggregator = new PingTimeAggregator(5);
_permanentlyDisconnected = false;
// Console.WriteLine("MongoServerInstance[{0}]: {1}", sequentialId, address);
}
private void ProcessInstanceStateChange(MongoServerInstance instance)
{
lock (_lock)
{
if (_instances.Contains(instance))
{
if (instance.State == MongoServerState.Connected)
{
if (!IsValidInstance(instance))
{
RemoveInstance(instance);
return;
}
var myAddress = instance.IsMasterResult.MyAddress;
if (myAddress != null && instance.Address != myAddress)
{
if (!_instances.Any(x => x.Address == myAddress))
{
instance.Address = myAddress;
}
else
{
// we need to get rid of the duplicate.
RemoveInstance(instance);
return;
}
}
if (_state != MongoServerState.Disconnecting && _state != MongoServerState.Disconnected)
{
_connectedInstances.EnsureContains(instance);
ProcessConnectedInstanceStateChange(instance);
}
}
else
{
_connectedInstances.Remove(instance);
ProcessDisconnectedInstanceStateChange(instance);
}
}
_state = DetermineServerState(_state, _instances);
}
}
/// <summary>
/// Determines the state of the server.
/// </summary>
/// <param name="currentState">State of the current.</param>
/// <param name="instances">The instances.</param>
/// <returns>The server state.</returns>
protected override MongoServerState DetermineServerState(MongoServerState currentState, IEnumerable <MongoServerInstance> instances)
{
if (!instances.Any())
{
return(MongoServerState.Disconnected);
}
// the order of the tests is significant
// and resolves ambiguities when more than one state might match
if (currentState == MongoServerState.Disconnecting)
{
if (instances.All(i => i.State == MongoServerState.Disconnected))
{
return(MongoServerState.Disconnected);
}
}
else
{
if (instances.All(i => i.State == MongoServerState.Disconnected))
{
return(MongoServerState.Disconnected);
}
else if (instances.All(i => i.State == MongoServerState.Connected))
{
return(MongoServerState.Connected);
}
else if (instances.Any(i => i.State == MongoServerState.Connecting))
{
return(MongoServerState.Connecting);
}
else if (instances.Any(i => i.State == MongoServerState.Unknown))
{
return(MongoServerState.Unknown);
}
else if (instances.Any(i => i.State == MongoServerState.Connected))
{
return(MongoServerState.ConnectedToSubset);
}
throw new MongoInternalException("Unexpected server instance states.");
}
return(currentState);
}
/// <summary>
/// Determines the state of the server.
/// </summary>
/// <param name="currentState">State of the current.</param>
/// <param name="instances">The instances.</param>
/// <returns>The server state.</returns>
protected override MongoServerState DetermineServerState(MongoServerState currentState, IEnumerable<MongoServerInstance> instances)
{
if (!instances.Any())
{
return MongoServerState.Disconnected;
}
// the order of the tests is significant
// and resolves ambiguities when more than one state might match
if (currentState == MongoServerState.Disconnecting)
{
if (instances.All(i => i.State == MongoServerState.Disconnected))
{
return MongoServerState.Disconnected;
}
}
else
{
if (instances.All(i => i.State == MongoServerState.Disconnected))
{
return MongoServerState.Disconnected;
}
else if (instances.All(i => i.State == MongoServerState.Connected))
{
return MongoServerState.Connected;
}
else if (instances.Any(i => i.State == MongoServerState.Connecting))
{
return MongoServerState.Connecting;
}
else if (instances.Any(i => i.State == MongoServerState.Unknown))
{
return MongoServerState.Unknown;
}
else if (instances.Any(i => i.State == MongoServerState.Connected))
{
return MongoServerState.ConnectedToSubset;
}
throw new MongoInternalException("Unexpected server instance states.");
}
return currentState;
}
/// <summary>
/// Disconnects from the server. Normally there is no need to call this method so
/// you should be sure to have a good reason to call it.
/// </summary>
public virtual void Disconnect()
{
// normally called from a connection when there is a SocketException
// but anyone can call it if they want to close all sockets to the server
lock (serverLock) {
if (state == MongoServerState.Connected)
{
primaryConnectionPool.Close();
primaryConnectionPool = null;
if (secondaryConnectionPools != null)
{
foreach (var secondaryConnectionPool in secondaryConnectionPools)
{
secondaryConnectionPool.Close();
}
secondaryConnectionPools = null;
}
state = MongoServerState.Disconnected;
}
}
}
/// <summary>
/// Ensures that an instance with the address exists.
/// </summary>
/// <param name="address">The address.</param>
protected void EnsureInstanceWithAddress(MongoServerAddress address)
{
if (address == null)
{
throw new ArgumentNullException("address");
}
lock (_lock)
{
if (!_instances.Any(x => x.Address == address))
{
var instance = new MongoServerInstance(_server, address);
AddInstance(instance);
if (_state != MongoServerState.Disconnecting && _state != MongoServerState.Disconnected)
{
_state = MongoServerState.Connecting;
ConnectInstance(instance);
}
}
}
}
/// <summary>
/// Sets the state.
/// </summary>
/// <param name="state">The state.</param>
internal void SetState(MongoServerState state)
{
lock (_serverInstanceLock)
{
if (_state == state)
{
return;
}
_state = state;
}
OnStateChanged();
}
internal void Connect(
bool slaveOk
) {
if (state != MongoServerState.Disconnected) {
var message = string.Format("MongoServerInstance.Connect can only be called when state is Disconnected, not when state is {0}.", state);
throw new InvalidOperationException(message);
}
State = MongoServerState.Connecting;
connectException = null;
try {
endPoint = address.ToIPEndPoint(server.Settings.AddressFamily);
var connectionPool = new MongoConnectionPool(this);
try {
var connection = connectionPool.AcquireConnection(null);
try {
try {
var isMasterCommand = new CommandDocument("ismaster", 1);
isMasterResult = connection.RunCommand("admin.$cmd", QueryFlags.SlaveOk, isMasterCommand);
} catch (MongoCommandException ex) {
isMasterResult = ex.CommandResult;
throw;
}
isPrimary = isMasterResult.Response["ismaster", false].ToBoolean();
isSecondary = isMasterResult.Response["secondary", false].ToBoolean();
isPassive = isMasterResult.Response["passive", false].ToBoolean();
isArbiter = isMasterResult.Response["arbiterOnly", false].ToBoolean();
if (!isPrimary && !slaveOk) {
throw new MongoConnectionException("Server is not a primary and SlaveOk is false.");
}
maxDocumentSize = isMasterResult.Response["maxBsonObjectSize", MongoDefaults.MaxDocumentSize].ToInt32();
maxMessageLength = Math.Max(MongoDefaults.MaxMessageLength, maxDocumentSize + 1024); // derived from maxDocumentSize
var buildInfoCommand = new CommandDocument("buildinfo", 1);
var buildInfoResult = connection.RunCommand("admin.$cmd", QueryFlags.SlaveOk, buildInfoCommand);
buildInfo = new MongoServerBuildInfo(
buildInfoResult.Response["bits"].ToInt32(), // bits
buildInfoResult.Response["gitVersion"].AsString, // gitVersion
buildInfoResult.Response["sysInfo"].AsString, // sysInfo
buildInfoResult.Response["version"].AsString // versionString
);
} finally {
connectionPool.ReleaseConnection(connection);
}
} catch {
connectionPool.Close();
throw;
}
State = MongoServerState.Connected;
this.connectionPool = connectionPool;
} catch (Exception ex) {
State = MongoServerState.Disconnected;
connectException = ex;
throw;
}
}
/// <summary> /// Determines the state of the server. /// </summary> /// <param name="currentState">State of the current.</param> /// <param name="instances">The instances.</param> /// <returns>The state of the server.</returns> protected abstract MongoServerState DetermineServerState(MongoServerState currentState, IEnumerable<MongoServerInstance> instances);
/// <summary>
/// Connects to the instances respecting the timeout and readPreference.
/// </summary>
/// <param name="timeout">The timeout.</param>
/// <param name="readPreference">The read preference.</param>
public void Connect(TimeSpan timeout, ReadPreference readPreference)
{
var timeoutAt = DateTime.UtcNow + timeout;
while (DateTime.UtcNow < timeoutAt)
{
if (ChooseServerInstance(_connectedInstances, readPreference) != null)
{
return;
}
if (Interlocked.CompareExchange(ref _outstandingInstanceConnections, 0, 0) > 0)
{
Thread.Sleep(TimeSpan.FromMilliseconds(20));
continue;
}
lock (_lock)
{
// test this again (kinda like the double lock check pattern). This value may
// be different and we don't want to issue another round of connects needlessly.
if (Interlocked.CompareExchange(ref _outstandingInstanceConnections, 0, 0) > 0)
{
Thread.Sleep(TimeSpan.FromMilliseconds(20));
continue;
}
// if we are already fully connected and an instance still isn't chosen,
// then one simply doesn't exist, so we'll break immediately and throw a
// connection exception.
if (_state == MongoServerState.Connected)
{
break;
}
_state = MongoServerState.Connecting;
_connectionAttempt++;
foreach (var instance in _instances)
{
ConnectInstance(instance);
}
}
}
ThrowConnectionException(readPreference);
}
/// <summary>
/// Disconnects this instance.
/// </summary>
internal void Disconnect()
{
// Console.WriteLine("MongoServerInstance[{0}]: Disconnect called.", sequentialId);
lock (_serverInstanceLock)
{
if (_stateVerificationTimer != null)
{
_stateVerificationTimer.Dispose();
_stateVerificationTimer = null;
}
if (_state == MongoServerState.Disconnecting || _state == MongoServerState.Disconnected)
{
return;
}
// set the state here because SetState raises an event that should not be raised while holding a lock
_state = MongoServerState.Disconnecting;
}
// we know for certain state has just changed.
OnStateChanged();
try
{
_connectionPool.Clear();
}
finally
{
SetState(MongoServerState.Disconnected);
}
}
/// <summary>
/// Determines the state of the server.
/// </summary>
/// <param name="currentState">State of the current.</param>
/// <param name="instances">The instances.</param>
/// <returns>The server state.</returns>
protected override MongoServerState DetermineServerState(MongoServerState currentState, IEnumerable<MongoServerInstance> instances)
{
if (!instances.Any())
{
return MongoServerState.Disconnected;
}
// the order of the tests is significant
// and resolves ambiguities when more than one state might match
if (currentState == MongoServerState.Disconnected)
{
return MongoServerState.Disconnected;
}
else if (currentState == MongoServerState.Disconnecting)
{
if (instances.All(i => i.State == MongoServerState.Disconnected))
{
return MongoServerState.Disconnected;
}
return MongoServerState.Disconnecting;
}
else
{
if (instances.Any(i => i.State == MongoServerState.Connected))
{
return MongoServerState.Connected;
}
return MongoServerState.Connecting;
}
}
private void ProcessInstanceStateChange(MongoServerInstance instance)
{
lock (_lock)
{
if (_instances.Contains(instance))
{
if (instance.State == MongoServerState.Connected)
{
if (!IsValidInstance(instance))
{
RemoveInstance(instance);
return;
}
if (instance.Address != instance.IsMasterResult.MyAddress)
{
if (!_instances.Any(x => x.Address == instance.IsMasterResult.MyAddress))
{
instance.Address = instance.IsMasterResult.MyAddress;
}
else
{
// we need to get rid of the duplicate.
RemoveInstance(instance);
return;
}
}
if (_state != MongoServerState.Disconnecting && _state != MongoServerState.Disconnected)
{
_connectedInstances.EnsureContains(instance);
ProcessConnectedInstanceStateChange(instance);
}
}
else
{
_connectedInstances.Remove(instance);
}
}
_state = DetermineServerState(_state, _instances);
}
}
private void SetState(MongoServerState state, ServerInformation serverInfo)
{
var currentServerInfo = Interlocked.CompareExchange(ref _stateInfo, null, null);
bool raiseChangedEvent = false;
lock (_stateLock)
{
if (_state != state)
{
_state = state;
raiseChangedEvent = true;
}
if (state == MongoServerState.Disconnected)
{
_connectionPool.Clear();
}
if (currentServerInfo != serverInfo && currentServerInfo.IsDifferentFrom(serverInfo))
{
Interlocked.Exchange(ref _stateInfo, serverInfo);
raiseChangedEvent = true;
}
}
if (raiseChangedEvent)
{
OnStateChanged();
}
}
// private methods
private void EnsureInstanceManager(TimeSpan timeout)
{
if (_serverProxy == null)
{
lock (_lock)
{
if (_serverProxy == null)
{
_connectionAttempt++;
_state = MongoServerState.Connecting;
Discover(timeout);
}
}
}
}
/// <summary>
/// Connects to the instances respecting the timeout and readPreference.
/// </summary>
/// <param name="timeout">The timeout.</param>
/// <param name="readPreference">The read preference.</param>
public void Connect(TimeSpan timeout, ReadPreference readPreference)
{
try
{
EnsureInstanceManager(timeout);
}
catch
{
_state = MongoServerState.Disconnected;
throw;
}
_serverProxy.Connect(timeout, readPreference);
}
private void SetState(MongoServerState state)
{
lock (_lock)
{
_state = state;
}
}
internal void SetState(MongoServerState state)
{
lock (_serverInstanceLock)
{
if (_state != state)
{
_state = state;
OnStateChanged();
}
}
}
internal void SetState(
MongoServerState state,
bool isPrimary,
bool isSecondary,
bool isPassive,
bool isArbiter)
{
lock (_serverInstanceLock)
{
if (_state != state || _isPrimary != isPrimary || _isSecondary != isSecondary || _isPassive != isPassive || _isArbiter != isArbiter)
{
_state = state;
_isPrimary = isPrimary;
_isSecondary = isSecondary;
_isPassive = isPassive;
_isArbiter = isArbiter;
OnStateChanged();
}
}
}
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="DiscoveringMongoServerProxy"/> class.
/// </summary>
/// <param name="settings">The settings.</param>
public DiscoveringMongoServerProxy(MongoServerSettings settings)
{
_state = MongoServerState.Disconnected;
_settings = settings;
_instances = settings.Servers.Select(a => new MongoServerInstance(settings, a)).ToList().AsReadOnly();
}
private void SetState(
MongoServerState state,
MongoServerInstanceType instanceType,
bool isPrimary,
bool isSecondary,
bool isPassive,
bool isArbiter,
ReplicaSetInformation replicaSetInformation)
{
lock (_serverInstanceLock)
{
bool changed = false;
bool replicaSetInformationIsDifferent = false;
if ((_replicaSetInformation == null && replicaSetInformation != null) || (_replicaSetInformation != replicaSetInformation))
{
replicaSetInformationIsDifferent = true;
}
if (_state != state || _instanceType != instanceType || replicaSetInformationIsDifferent || _isPrimary != isPrimary || _isSecondary != isSecondary || _isPassive != isPassive || _isArbiter != isArbiter)
{
changed = true;
_state = state;
_instanceType = instanceType;
if (_replicaSetInformation != replicaSetInformation)
{
_replicaSetInformation = replicaSetInformation;
}
_isPrimary = isPrimary;
_isSecondary = isSecondary;
_isPassive = isPassive;
_isArbiter = isArbiter;
}
if (changed)
{
if (_state == MongoServerState.Disconnected)
{
_connectionPool.Clear();
}
OnStateChanged();
}
}
}
/// <summary>
/// Sets the state.
/// </summary>
/// <param name="state">The state.</param>
internal void SetState(MongoServerState state)
{
lock(_serverInstanceLock)
{
SetState(state, _instanceType, _isPrimary, _isSecondary, _isPassive, _isArbiter, _replicaSetInformation);
}
}
/// <summary>
/// Connects this instance.
/// </summary>
internal void Connect()
{
// Console.WriteLine("MongoServerInstance[{0}]: Connect() called.", sequentialId);
lock (_serverInstanceLock)
{
if (_permanentlyDisconnected || _state == MongoServerState.Connecting || _state == MongoServerState.Connected)
{
return;
}
_connectException = null;
// set the state manually here because SetState raises an event that shouldn't be raised
// while holding a lock.
_state = MongoServerState.Connecting;
}
// We know for certain that the state just changed
OnStateChanged();
try
{
var connection = _connectionPool.AcquireConnection(null, null);
try
{
Ping(connection);
LookupServerInformation(connection);
}
finally
{
_connectionPool.ReleaseConnection(connection);
}
SetState(MongoServerState.Connected);
}
catch (Exception ex)
{
lock (_serverInstanceLock)
{
_connectException = ex;
}
_connectionPool.Clear();
Interlocked.Exchange(ref _connectException, ex);
SetState(MongoServerState.Disconnected);
throw;
}
finally
{
lock (_serverInstanceLock)
{
if (_stateVerificationTimer == null)
{
_stateVerificationTimer = new Timer(o => StateVerificationTimerCallback(), null, TimeSpan.FromSeconds(10), TimeSpan.FromSeconds(10));
}
}
}
}
/// <summary> /// Determines the state of the server. /// </summary> /// <param name="currentState">State of the current.</param> /// <param name="instances">The instances.</param> /// <returns>The state of the server.</returns> protected abstract MongoServerState DetermineServerState(MongoServerState currentState, IEnumerable <MongoServerInstance> instances);
/// <summary>
/// Disconnects the server.
/// </summary>
public void Disconnect()
{
lock (_lock)
{
if (_state == MongoServerState.Disconnected || _state == MongoServerState.Disconnecting)
{
return;
}
_state = MongoServerState.Disconnecting;
try
{
_connectedInstances.Clear();
foreach (var instance in _instances)
{
try
{
instance.Disconnect();
}
catch { } // ignore disconnection errors
}
}
finally
{
_state = MongoServerState.Disconnected;
}
}
}
/// <remarks>This method must be called outside of a lock.</remarks>
private void SetState(MongoServerState newState, ServerInformation newServerInfo)
{
bool raiseChangedEvent = false;
lock (_serverInstanceLock)
{
if (_state != newState)
{
_state = newState;
raiseChangedEvent = true;
}
if (newState == MongoServerState.Disconnected)
{
_connectionPool.Clear();
}
if (_serverInfo != newServerInfo && _serverInfo.IsDifferentFrom(newServerInfo))
{
_serverInfo = newServerInfo;
raiseChangedEvent = true;
}
}
if (raiseChangedEvent)
{
OnStateChanged();
}
}
/// <summary>
/// Ensures that an instance with the address exists.
/// </summary>
/// <param name="address">The address.</param>
protected void EnsureInstanceWithAddress(MongoServerAddress address)
{
if (address == null)
{
throw new ArgumentNullException("address");
}
lock (_lock)
{
if (!_instances.Any(x => x.Address == address))
{
var instance = new MongoServerInstance(_server, address);
AddInstance(instance);
if (_state != MongoServerState.Disconnecting && _state != MongoServerState.Disconnected)
{
_state = MongoServerState.Connecting;
ConnectInstance(instance);
}
}
}
}
internal void Disconnect() {
if (state != MongoServerState.Disconnected) {
try {
// if we fail during Connect the connectionPool field will still be null
if (connectionPool != null) {
connectionPool.Close();
connectionPool = null;
}
} finally {
State = MongoServerState.Disconnected;
}
}
}
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="MongoServerInstance"/> class.
/// </summary>
/// <param name="server">The server.</param>
/// <param name="address">The address.</param>
internal MongoServerInstance(MongoServer server, MongoServerAddress address)
{
_server = server;
_address = address;
_sequentialId = Interlocked.Increment(ref __nextSequentialId);
_maxDocumentSize = MongoDefaults.MaxDocumentSize;
_maxMessageLength = MongoDefaults.MaxMessageLength;
_state = MongoServerState.Disconnected;
_instanceType = MongoServerInstanceType.Unknown;
_connectionPool = new MongoConnectionPool(this);
_pingTimeAggregator = new PingTimeAggregator(5);
_stateVerificationTimer = new Timer(o => StateVerificationTimerCallback(), null, TimeSpan.Zero, TimeSpan.FromSeconds(10));
// Console.WriteLine("MongoServerInstance[{0}]: {1}", sequentialId, address);
}
/// <summary>
/// Sets the state.
/// </summary>
/// <param name="state">The state.</param>
internal void SetState(MongoServerState state)
{
SetState(state, Interlocked.CompareExchange(ref _stateInfo, null, null));
}