Github user mattf-horton commented on a diff in the pull request:
https://github.com/apache/incubator-metron/pull/308#discussion_r83381517
--- Diff:
metron-platform/metron-parsers/src/main/java/org/apache/metron/parsers/interfaces/MessageParser.java
---
@@ -34,15 +34,15 @@
* @param rawMessage
* @return If null is returned, this is treated as an empty list.
*/
- List<T> parse(byte[] rawMessage);
+ List<T> parse(byte[] rawMessage, SensorParserConfig sensorParserConfig);
--- End diff --
I really like this idea architecturally, if it is assured that the call to
configure() only happens between messages and not asynchronously during a
parse. If so, ParserBolt can call a parser-specific routine
"parser.checkParserConfigForChange(parserConfig)" to see if the changes are of
interest to the particular parser being run, which would be cheaper than
checking for ANY changes in the whole config. If the answer is yes, a call to
parser.configure() is exactly what the current patch does. But we only want to
do this for parsers that care about config, so maybe we should distinguish
between MessageParsers and ConfiguredMessageParsers, and do the check in
ParserBolt only for ConfiguredMessageParsers.
Otherwise, I did figure out how to give GrokParser access to the cached
value of grokPattern in a clean and efficient way. But I like @nickwallen 's
idea more, if we can agree on it.
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