Add IP discovery.

Before a client wants to join a network, it may send a HTTP "ping"
request to a known participant. The participant will send a HTTP "pong"
request in response, which informs the client of its IP address.

The IP address of a client is automatically retrieved from the first
HTTP request received by Jetty.

1 files changed, 10 insertions, 0 deletions

diff --git a/jsonrpc/src/main/java/com/orbekk/same/UrlReceiver.java b/jsonrpc/src/main/java/com/orbekk/same/UrlReceiver.java
new file mode 100644
index 0000000..31a0276
--- /dev/null
+++ b/jsonrpc/src/main/java/com/orbekk/same/UrlReceiver.java
@@ -0,0 +1,10 @@
+package com.orbekk.same;
+
+/**
+ * An interface to get notified of the URL to this computer.
+ *
+ * This interface is used to reliably obtain the URL of this host.
+ */
+public interface UrlReceiver {
+    void setUrl(String url);
+}