Initial commit

src/main/java/com/github/nkzawa/socketio/client/On.java

@@ -0,0 +1,23 @@
+package com.github.nkzawa.socketio.client;
+
+import com.github.nkzawa.emitter.Emitter;
+
+public class On extends Emitter {
+
+    private On() {}
+
+    public static Handle on(final Emitter obj, final String ev, final Listener fn) {
+        obj.on(ev, fn);
+        return new Handle() {
+            @Override
+            public void destroy() {
+                obj.off(ev, fn);
+            }
+        };
+    }
+
+    public static interface Handle {
+
+        public void destroy();
+    }
+}