Method on

src/main/java/io/socket/client/On.java:9–17

(final Emitter obj, final String ev, final Emitter.Listener fn)

    private On() {}

    public static Handle on(final Emitter obj, final String ev, final Emitter.Listener fn) {
        obj.on(ev, fn);
        return new Handle() {
            @Override
            public void destroy() {
                obj.off(ev, fn);
            }
        };
    }

    public interface Handle {