public Builder setRevisionIdBytes(com.google.protobuf.ByteString value) {
      if (value == null) {
        throw new NullPointerException();
      }
      checkByteStringIsUtf8(value);
      revisionId_ = value;
      bitField0_ |= 0x00000008;
      onChanged();
      return this;
    }
<pre>
Output only. The revision of the workflow.
A new revision of a workflow is created as a result of updating the
following properties of a workflow:

- [Service account][google.cloud.workflows.v1.Workflow.service_account]
- [Workflow code to be
executed][google.cloud.workflows.v1.Workflow.source_contents]

The format is "000001-a4d", where the first six characters define
the zero-padded revision ordinal number. They are followed by a hyphen and
three hexadecimal random characters.
</pre>

<code>string revision_id = 4 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@param value The bytes for revisionId to set.
@return This builder for chaining.
java-workflows/proto-google-cloud-workflows-v1/src/main/java/com/google/cloud/workflows/v1/Workflow.java