Github user tweise commented on a diff in the pull request:
https://github.com/apache/incubator-apex-core/pull/193#discussion_r48622986
--- Diff: api/src/main/java/com/datatorrent/api/Context.java ---
@@ -335,10 +335,16 @@
Attribute<String> APPLICATION_DATA_LINK = new Attribute<String>(new
String2String());
/**
* Transport to push the stats and the metrics, "builtin:{topic}" if
STRAM should push the data directly
- * using websocket with the given topic
+ * using websocket with the given topic.
+ * If using a custom transport, please use Object2String codec to
specify the transport object. The object must
+ * be from a class that implements the AutoMetric.Transport interface
*/
Attribute<String> METRICS_TRANSPORT = new Attribute<String>(new
String2String());
--- End diff --
As discussed, maybe look at the other option again to use a placeholder
object for the "built-in" transport and swap it out for the engine internal
implementation when wiring the dependencies in the AM?
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