@Override
    public String toString() {
        return "OutboundMessageEvent{" + "invokeId=" + invokeId + ", message=" + message + '}';
    }
The default outbound {@link MessageEvent} implementation.

@author jiachun.fjc
jraft-rheakv/rheakv-core/src/main/java/com/alipay/sofa/jraft/rhea/util/pipeline/event/OutboundMessageEvent.java