mosche commented on a change in pull request #16503:
URL: https://github.com/apache/beam/pull/16503#discussion_r789843552
##########
File path:
sdks/java/io/amazon-web-services2/src/main/java/org/apache/beam/sdk/io/aws2/sns/SnsIO.java
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@@ -418,8 +420,14 @@ public void setup() throws Exception {
@ProcessElement
public void processElement(ProcessContext context) throws Exception {
- PublishRequest request =
- (PublishRequest)
spec.getPublishRequestFn().apply(context.element());
+ PublishRequest.Builder reqBuilder =
Review comment:
It's actually not any different from before ... only if one uses the
deprecated old interface there's an additional roundtrip converting a
`PublishRequest` to `PublishRequest.Builder` to set the `topic` and back to
`PublishRequest`.
Previously `publishRequestFn` as `T => PublishRequest` was also using a
`PublishRequest.Builder` per input element. But the request had to be build
immediately. E.g.
```java
PublishRequest.builder().topicArn("topicArn").message(m).build()
```
It would be possible to use `(T, PublishRequest.Builder) => PublishRequest`
instead and reuse the same builder. But that comes with a rather high risk of
leaking state between input elements as soon as fields are set conditionally by
users. And the AWS SDK doesn't allow clearing a builder, so each field has to
be reset manually with the risk of missing newly added fields.
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