@Override
  public @NotNull List<@NotNull Connection> getSentConnections() {
    if (streamers.isEmpty()) {
      return Collections.emptyList();
    }

    final List<Connection> connections = new ArrayList<>();
    for (final MsgStreamer streamer : streamers) {
      connections.addAll(streamer.getSentConnections());
    }
    return connections;
  }
List of {@link MsgStreamer}s encapsulated by this MsgStreamerList.
geode-core/src/main/java/org/apache/geode/internal/tcp/MsgStreamerList.java