private String printEventIdList(Set<EventID> eventIds) {
    return "["
        + eventIds.stream().map(EventID::expensiveToString)
            .collect(Collectors.joining(", "))
        + "]";
  }
Initialize the Executor that handles listener events. Only used by non-primary gateway senders
geode-core/src/main/java/org/apache/geode/internal/cache/wan/serial/SerialGatewaySenderEventProcessor.java