Github user cestella commented on a diff in the pull request:
https://github.com/apache/incubator-metron/pull/453#discussion_r100799069
--- Diff:
metron-platform/metron-writer/src/main/java/org/apache/metron/writer/bolt/BulkMessageWriterBolt.java
---
@@ -74,7 +81,11 @@ public void prepare(Map stormConf, TopologyContext
context, OutputCollector coll
this.writerComponent = new BulkWriterComponent<>(collector);
this.collector = collector;
super.prepare(stormConf, context, collector);
- messageGetter = MessageGetters.valueOf(messageGetterStr);
+ if
(messageGetStrategyType.equals(MessageGetters.JSON_FROM_FIELD.name()) &&
messageGetField != null) {
--- End diff --
Why is this special case for JSON_FROM_FIELD required? Is it because of
the arg? If so, it's probably better to adjust `MessageGetters` rather than
doing it here. I'd suggest making a factory rather than a strategy in this
case for it:
```
public enum MessageGetters {
BYTES_FROM_POSITION(arg -> new BytesFromPosition(arg)),
JSON_FROM_POSITION(arg -> new JSONFromPosition(arg)),
JSON_FROM_FIELD(arg -> new JSONFromField(arg));
Function<Object, MessageGetStrategy> messageGetStrategy;
MessageGetters(Function<Object, MessageGetStrategy> messageGetStrategy) {
this.messageGetStrategy = messageGetStrategy;
}
public MessageGetStrategy get(Object arg) {
return messageGetStrategy.apply(arg);
}
}
```
Then it becomes
`MessageGetters.valueOf(messageGetStrategyType).get(messageGetField)`
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