HCOLL-134 ( release draft cut of the code so that I can test it across my network )

src/main/java/net/openhft/chronicle/map/NodeDiscovery.java

@@ -978,7 +978,7 @@ class ConcurrentExpiryMap<K extends BytesMarshallable, V extends BytesMarshallab
     }
 
 
-    /*public static void main(String... args) {
+    public static void main(String... args) {
         String ip;
         try {
             Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
@@ -998,5 +998,40 @@ class ConcurrentExpiryMap<K extends BytesMarshallable, V extends BytesMarshallab
         } catch (SocketException e) {
             throw new RuntimeException(e);
         }
-    }*/
+    }
+
+
+    /**
+     * private NetworkInterface defaultNetworkInterface() throws SocketException { NetworkInterface
+     * networkInterface = null
+     *
+     * for (String suggestedName : new String[]{"en0", "eth0"}) { networkInterface =
+     * NetworkInterface.getByName(suggestedName); if (networkInterface != null) break; } return
+     * networkInterface; }
+     *
+     * /**
+     *
+     * @return the default network interface, or
+     * @throws SocketException
+     */
+    public static NetworkInterface defaultNetworkInterface() throws SocketException {
+        NetworkInterface networkInterface = null;
+
+        for (String suggestedName : new String[]{"en0", "eth0"}) {
+            networkInterface = NetworkInterface.getByName(suggestedName);
+            if (networkInterface != null)
+                break;
+        }
+
+        if (networkInterface != null)
+            return networkInterface;
+
+        Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
+        if (networkInterfaces == null || !networkInterfaces.hasMoreElements())
+            return null;
+
+        return networkInterfaces.nextElement();
+
+
+    }
 }

src/test/java/net/openhft/chronicle/map/NodeDiscoveryTest.java

@@ -14,8 +14,9 @@ public class NodeDiscoveryTest {
     public void testDiscoverMap() throws Exception {
         final NodeDiscovery nodeDiscovery = new NodeDiscovery();
 
-        NetworkInterface en0 = NetworkInterface.getByName("en0");
-        Enumeration<InetAddress> inetAddresses = en0.getInetAddresses();
+
+        NetworkInterface networkInterface = ConcurrentExpiryMap.defaultNetworkInterface();
+        Enumeration<InetAddress> inetAddresses = networkInterface.getInetAddresses();
 
         AddressAndPort ourAddressAndPort1 = new AddressAndPort(inetAddresses.nextElement().getAddress(),
                 (short) 1237);
@@ -24,4 +25,6 @@ public class NodeDiscoveryTest {
 
         Thread.sleep(1000000);
     }
+
+
 }