axon = require('axon');
// start axon's socket
socket = axon.socket('sub-emitter')
socket.connect(9105) // 9105 is the data-system axon port
socket.on('file.*', function(event, id){
    // event is one of 'create', 'update', 'delete'
    // id == id of the updated file
    File.find(id, function(err, updatedFile){
        // do anything with the file
    });
});