/// <summary>
/// Methiod to be replaced!!!
/// </summary>
/// <param name="remoteAddress">The address of a remote node to connect to.</param>
/// <returns>A network connected to that node.</returns>
internal NetworkBase ConnectTo(NodeAddress remoteAddress)
{
var existing = connectedNetworks.FirstOrDefault(n => n.CanCreate(remoteAddress));
if (existing != null)
{
existing.Connect(remoteAddress);
return(existing);
}
foreach (var reg in availableNetworks)
{
NetworkBase result;
if (reg.CanCreate(remoteAddress))
{
result = reg.CreateNetwork();
result.Connect(remoteAddress);
if (result != null)
{
connectedNetworks.Add(result);
return(result);
}
}
}
return(null);
}
/// <summary>Finds the <see cref="Node"/> for the given <see cref="NodeAddress"/>.</summary>
/// <param name="address">The <see cref="NodeAddress"/> to find.</param>
/// <returns>The found <see cref="Node"/>.</returns>
public INode FindOrCreate(NodeAddress address)
{
var found = FindOrDefault(address);
if (found == null)
{
found = Create(address);
connectedNodes.Add(found);
}
return(found);
}
/// <summary>Detach this node from its parent and advises each child to connect to the
/// parent individually via <see cref="AdviseConnect"/>.</summary>
public override void Disconnect()
{
NodeAddress parent = Address.Parent;
DetachFromParent();
// Take a copy of the children so they disconnect at will
foreach (var child in Children.ToArray())
{
var childNode = Network.FindOrCreate(child);
childNode.AdviseConnect(parent);
}
}
/// <summary>The advise connect.</summary>
/// <param name="newParent">The parent.</param>
public override void AdviseConnect(NodeAddress newParent)
{
if (HasParent && !Address.Parent.Matches(newParent))
{
DetachFromParent();
}
var parentNode = Network.FindOrCreate(newParent);
var actualParentAddress = parentNode.Connect(Address);
if (actualParentAddress.Matches(newParent))
{
Address.Parent = newParent;
OnIsConnectedChanged();
}
}
/// <summary>
/// Sends some data to the entire network.
/// </summary>
/// <param name="network">Where to send the data.</param>
/// <param name="type">Type of data to send.</param>
/// <param name="data">Untyped data to send.</param>
/// <param name="from">Where this data originates from.</param>
public void SendToNetwork(INetwork network, string type, byte[] data, NodeAddress from)
{
var recipient = network.FindOrDefault(Address.Parent);
if (recipient != null &&
recipient.Address.Matches(from) == false)
{
recipient.Send(type, data, Address);
}
foreach (var x in Children)
{
if (x.Matches(from) == false)
{
recipient = network.FindOrDefault(x);
recipient.Send(type, data, Address);
}
}
}
/// <summary>Connects with a new node, by determining which is the parent.</summary>
/// <remarks>Delegates to the <see cref="NodeWithoutContract.ElectionStrategy"/> to confirm if we should be the parent of the node.</remarks>
/// <param name="newNode">The new node.</param>
/// <returns>The <see cref="NodeAddress"/>.</returns>
public override NodeAddress Connect(NodeAddress newNode)
{
if (Address.AsString == newNode.AsString)
{
throw new InvalidOperationException(Address + " is my local address - Can't connect to " + newNode);
}
var parent = this as INode;
var child = Network.FindOrCreate(newNode);
ElectionStrategy.DetermineParent(ref parent, ref child);
if (parent == this)
{
ConnectChild(child);
return(Address);
}
else
{
child.AdviseConnect(Address);
return(null);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="Node"/> class.</summary>
/// <remarks>You can't call this, instead use <see cref="INetwork.FindOrCreate"/> which will create and track nodes for you </remarks>
/// <param name="newAddress">The new address.</param>
/// <param name="locator">The locator used to connect to other nodes.</param>
internal Node(NodeAddress newAddress, INetwork locator)
{
Address = newAddress;
Network = locator;
ElectionStrategy = new FirstComeFirstElectedStrategy();
}
/// <summary>Registers a child node.</summary>
/// <param name="address">The address.</param>
protected void AddChild(NodeAddress address)
{
Children.Add(address);
}
/// <summary>
/// Determines if this network can connect to a given <see cref="NodeAddress"/>
/// </summary>
/// <param name="remoteAddress">The remote address that we should detect if we can connect to.</param>
/// <returns>True if we know how to connect to that type of address.</returns>
internal virtual bool CanCreate(NodeAddress remoteAddress)
{
return(remoteAddress.AsString.StartsWith(SchemaName));
}
/// <summary>Sends data across the network.</summary> /// <param name="type"><see cref="Type"/> that the data should be deserialized to.</param> /// <param name="data">The data.</param> /// <param name="from">Where not to send data back to.</param> public abstract void Send(string type, byte[] data, NodeAddress from);
/// <summary>Advises a child node to disconnect from its parent.</summary> /// <param name="address">The address.</param> public abstract void ChildDisconnect(NodeAddress address);
/// <summary>Send advise to another node of who it should connect to.</summary> /// <remarks>When a parent has children and the parent is closing down, we will advise each child to connect to the /// grandparent instead. (See <see cref="INodeContract.Connect"/> for a quick description of how the grandparent will delegate /// connection to other nodes instead.</remarks> /// <param name="newParent">The parent.</param> public abstract void AdviseConnect(NodeAddress newParent);
/// <summary>Ask the node given in the <paramref name="newNode"/> parameter who we should connect to.</summary> /// <remarks>The <see cref="Node.ElectionStrategy"/> is used to decide who we should actually connect to as a child. /// This could mean that this node actually becomes the child of a completely different node, for example when the /// node we asked is already full and delegates us to its child. Alternatively it could decide that we shouldn't be anyone's child, /// so it will attempt to connect to us by calling our <see cref="INodeContract.Connect"/> instead.</remarks> /// <param name="newNode">The node we think we want to connect to.</param> /// <returns>The node we actually did connect to.</returns> public abstract NodeAddress Connect(NodeAddress newNode);
/// <summary>Determines if this <see cref="Node"/> has the given child.</summary>
/// <param name="address">The address.</param>
/// <returns>The <see cref="bool"/>.</returns>
public bool HasChild(NodeAddress address)
{
return(Children.Any(x => x.Matches(address)));
}
/// <summary>Finds the <see cref="Node"/> for the given <see cref="NodeAddress"/>.</summary>
/// <param name="address">The <see cref="NodeAddress"/> to find.</param>
/// <returns>The found <see cref="Node"/> or null.</returns>
public INode FindOrDefault(NodeAddress address)
{
var found = (from x in connectedNodes where x.Address.Matches(address) select x).FirstOrDefault();
return(found);
}
/// <summary>Add a node to the network.</summary>
/// <param name="child">The child.</param>
public virtual void Connect(NodeAddress child)
{
Local.Connect(child);
}
/// <summary>Disconnect the given child.</summary>
/// <param name="address">The address.</param>
public override void ChildDisconnect(NodeAddress address)
{
Contract.Assert(Children.Any(x => x.Matches(address)));
Children.RemoveAll(x => x.Matches(address));
}
/// <summary>Creates nodes representing other nodes.</summary> /// <param name="address">The address.</param> /// <returns>The <see cref="INode"/>.</returns> protected abstract INode Create(NodeAddress address);
/// <summary>Sends data across the network.</summary>
/// <param name="type"><see cref="Type"/> to deserialize data back to.</param>
/// <param name="data">The data.</param>
/// <param name="from">Where the data came from.</param>
public override void Send(string type, byte[] data, NodeAddress from)
{
Network.OnReceived(type, data);
SendToNetwork(Network, type, data, from);
}
