Method getArg

api/src/main/java/io/grpc/NameResolver.java:455–459

Returns the value of a custom arg named 'key', or null if it's not set. While ordinary Args should be universally useful and meaningful, custom arguments can apply just to resolvers of a certain URI scheme, just to resolvers producing a particular type of {@link java.net.SocketAd

(Key<T> key)

     * io.grpc package.
     */
    @SuppressWarnings("unchecked") // Cast is safe because all put()s go through the setArg() API.
    @Nullable
    public <T> T getArg(Key<T> key) {
      return customArgs != null ? (T) customArgs.get(key) : null;
    }

    /**
     * Returns the {@link ChannelLogger} for the Channel served by this NameResolver.