added static list of all peers

lib/Messenger/src/peers/peer.dart

@@ -9,6 +9,9 @@ abstract class Peer{
   ///logging object
   static final Logger parent_log = new Logger("Peer");
 
+  //list of all local peers
+  static Map<String, Peer> peers;
+
   Logger log;
 
   ///number of all local peer instances
@@ -44,6 +47,9 @@ abstract class Peer{
   Peer([String name="", Level logLevel=Level.FINE]){
     this.name = (name.length < 1)?"peer" + (++num).toString():name; //set name of this peer instance
 
+    if(peers.keys.contains(this.name))
+      throw new StateError("peer with name ${this.name} already exists!");
+
     //setup logger
     hierarchicalLoggingEnabled = true;
     log = new Logger("Peer.${this.runtimeType}.${this.name}");
@@ -61,6 +67,9 @@ abstract class Peer{
     readyState=ReadyState.NEW;
 
     log.info("new peer: #${num.toString()} ${this.name} ");
+
+    //add instance reference to peerlist
+    peers[this.name] = this;
   }
 
   /**