@Override
  public String toString() {
    return "GatewaySenderEventCallbackArgument [" + "originalCallbackArg="
        + getOriginalCallbackArg() + ";originatingSenderId="
        + originatingDSId + ";recipientGatewayReceivers="
        + receipientDSIds + "]";
  }
Initialize the original set of recipient <code>Gateway</code>s.

@param originalGatewaysReceivers The original recipient <code>Gateway</code>s.
geode-core/src/main/java/org/apache/geode/internal/cache/wan/GatewaySenderEventCallbackArgument.java