/// <summary>
/// Initializes a new node instance
/// </summary>
/// <param name="nodeID">
/// This node's ID
/// </param>
/// <param name="parentID">
/// An optional initial peer ID
/// </param>
/// <param name="db">
/// This node's database
/// </param>
public Node(
Uri nodeID,
Uri parentID,
Database db)
{
this.peers = new PeerList(Config.Instance.MaxPeersPerNode);
this.peers.OnPeerException += this.HandlePeerException;
this.wakeupTimer = new System.Timers.Timer();
this.nodeID = nodeID;
this.parentID = parentID;
if (parentID != null)
this.peers.GetOrAdd(parentID);
this.db = db;
this.wakeupTimer.Elapsed += Wakeup;
this.wakeupTimer.AutoReset = false;
this.wakeupTimer.Interval = StaticRandom.NextCentered(Config.Instance.WakeupInterval, 100);
this.wakeupTimer.Start();
}
/// <summary>
/// Starts up a single gossip node instance
/// </summary>
/// <param name="nodeIdx">
/// The zero-based node index
/// </param>
/// <returns>
/// The WCF service host for the instance
/// </returns>
static ServiceHost StartNode(Int32 nodeIdx)
{
// construct the node/parent address URIs
var parentIdx = (nodeIdx - 1) / Config.Instance.MaxPeersPerNode;
var nodeAddress = new UriBuilder(
"udp",
System.Net.Dns.GetHostName(),
Config.Instance.BasePort + nodeIdx
).Uri;
var parentAddress = (nodeIdx == 0) ?
(PeerHost != null) ?
new UriBuilder("udp", PeerHost, Config.Instance.BasePort).Uri :
null :
new UriBuilder(
"udp",
System.Net.Dns.GetHostName(),
Config.Instance.BasePort + parentIdx
).Uri;
// create and configure the current node's database, and
// create and register the configured item combinators
var db = new Database();
db.OnCombined += item => HandleCombined(nodeIdx, item);
foreach (var config in Config.Instance.Combinators)
db.Register(config.Namespace, CreateCombinator(config));
// create the node and the WCF service host,
// and listen on the node's address
var node = new Node(nodeAddress, parentAddress, db);
var wcfHost = new ServiceHost(node);
wcfHost.AddServiceEndpoint(
typeof(INode),
new Udp.Binding(),
nodeAddress
);
wcfHost.Open();
return wcfHost;
}