Github user manuzhang commented on a diff in the pull request:
https://github.com/apache/incubator-gearpump/pull/67#discussion_r72599381
--- Diff:
examples/streaming/kafka/src/main/scala/org/apache/gearpump/streaming/examples/kafka/KafkaReadWrite.scala
---
@@ -86,4 +90,30 @@ object KafkaReadWrite extends AkkaApp with
ArgumentsParser {
val appId = context.submit(application(config, context.system))
context.close()
}
+
+
+ class EventTimeKafkaMessageDecoder extends KafkaMessageDecoder {
+ private var count = 0
+ private var localMin = Long.MaxValue
+ private var watermark = 0L
+ private val LOG =
LogUtil.getLogger(classOf[EventTimeKafkaMessageDecoder])
+ /**
+ * @param key key of a kafka message, can be NULL
+ * @param value value of a kafka message
+ * @return a gearpump Message
+ */
+ override def fromBytes(key: Array[Byte], value: Array[Byte]):
MessageAndWatermark = {
+ Injection.invert[Long, Array[Byte]](key).map { eventTime =>
+ if (count == 10) {
+ watermark = localMin
--- End diff --
this is just one example of watermark which is aligned with the way event
timestamp generated by `KafkaWriter`. I'd better remove it immediately without
causing further confusions.
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