private com.google.protobuf.SingleFieldBuilderV3<
            io.vertx.mod.ipc.eon.IpcEnvelop, io.vertx.mod.ipc.eon.IpcEnvelop.Builder, io.vertx.mod.ipc.eon.IpcEnvelopOrBuilder>
        getEnvelopFieldBuilder() {
            if (this.envelopBuilder_ == null) {
                this.envelopBuilder_ = new com.google.protobuf.SingleFieldBuilderV3<