public Builder mergeEnvelop(final io.vertx.mod.ipc.eon.IpcEnvelop value) {
            if (this.envelopBuilder_ == null) {
                if (this.envelop_ != null) {
                    this.envelop_ =
                        io.vertx.mod.ipc.eon.IpcEnvelop.newBuilder(this.envelop_).mergeFrom(value).buildPartial();