make it possible to run fluency without runtime dependency on jackson

[pkolaric]

This allows running fluency without runtime dependencies on jackson-databind (e.g. in Micronaut ecosystem), by implementing a custom org.komamitsu.fluency.recordformat.RecordFormatter and passing it to FluencyBuilderForFluentd.

[komamitsu]

Thanks for the contribution! I left some comments. See them when you have time.

[komamitsu]

ack field is contained in a Map structure data, and the order and the number of fields can be changed https://github.com/fluent/fluentd/wiki/Forward-Protocol-Specification-v1#response. So, the Ack value must be obtained by specifying key ack.

[pkolaric]

Missed this one... Fixed.

[pkolaric]

Sorry for the late response i was away for the past 10 days.

[komamitsu]

@pkolaric I might be missing something. As long as build.gradle.kts has the dependency to org.msgpack:jackson-dataformat-msgpack, jackson-databind basically remains in the runtime dependency. How will you build your library or application with the change of this PR?

[pkolaric]

By excluding the transitive dependency on jackson, when including fluency, e.g.:

implementation("org.komamitsu:fluency-core:2.7.2-sh3") {
        exclude(group = "org.msgpack", module = "jackson-dataformat-msgpack")
}
implementation("org.komamitsu:fluency-fluentd:2.7.2-sh3") {
        exclude(group = "org.msgpack",  module = "jackson-dataformat-msgpack")
}

This is enough to run fluency without depending on jackson-databind and everything it drags with it.