private void bindSingletons() {
    bind(Configuration.class).toInstance(configuration);
    bind(BaseConfiguration.class).toInstance(configuration);

    ServerStatus serverStatus = new ServerStatus(configuration);
    serverStatus.addCapability(ServerStatus.Capability.RADIO);
    bind(ServerStatus.class).toInstance(serverStatus);
    bind(InputRegistry.class).toProvider(RadioInputRegistryProvider.class);
  }
 protected void restrictToMaster() {
   if (!serverStatus.hasCapability(ServerStatus.Capability.MASTER)) {
     LOG.warn("Rejected request that is only allowed against master nodes. Returning HTTP 403.");
     throw new WebApplicationException(403);
   }
 }