public static ClientTransport getReverseClientTransport(String channelKey) {
        return REVERSE_CLIENT_TRANSPORT_MAP != null ?
            REVERSE_CLIENT_TRANSPORT_MAP.get(channelKey) : null;
    }
Find reverse client transport by channel key

@param channelKey channel key
@return client transport
@see ClientTransportFactory#getReverseClientTransport
@see NetUtils#channelToString
core/api/src/main/java/com/alipay/sofa/rpc/transport/ClientTransportFactory.java