@Override
  public GatewaySenderFactory setSocketBufferSize(int socketBufferSize) {
    attrs.setSocketBufferSize(socketBufferSize);
    return this;
  }
Used internally to pass the attributes from this factory to the real GatewaySender it is
creating.
geode-wan/src/main/java/org/apache/geode/cache/wan/internal/GatewaySenderFactoryImpl.java