@java.lang.Override
  public int getSerializedSize() {
    int size = memoizedSize;
    if (size != -1) return size;

    size = 0;
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(revisionId_)) {
      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, revisionId_);
    }
    size += getUnknownFields().getSerializedSize();
    memoizedSize = size;
    return size;
  }
<pre>
Optional. The revision of the workflow to retrieve. If the revision_id is
empty, the latest revision is retrieved.
The format is "000001-a4d", where the first six characters define
the zero-padded decimal revision number. They are followed by a hyphen and
three hexadecimal characters.
</pre>

<code>string revision_id = 2 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The bytes for revisionId.
java-workflows/proto-google-cloud-workflows-v1/src/main/java/com/google/cloud/workflows/v1/GetWorkflowRequest.java