This repository provides a @logging annotation.
This annotation inserts logging before/after invoking annotated method.
val logger = new { def info(s: => String): Unit = println(s"${LocalDateTime.now()}: $s") } // provide your own logger(just a `String => Unit` function) @logging(logger.info) def add(i: Int, j: Int): Int = { i + j } println(add(1, 2))Outputs are below.
2017-08-19T23:05:26.279: [start]add(1, 2)
2017-08-19T23:05:26.308: [end]add(1, 2) => 3
3
Also see samples.
This annotation inserts logging before invoking annotated method with elapsed milli seconds.
val logger = new { def info(s: => String): Unit = println(s"${LocalDateTime.now()}: $s") } @timeLogging(logger.info) def add(i: Int, j: Int): Int = { i + j } println(add(1, 2)) @timeLogging(logger.info) def add2(i: Int)(j: Int)(): Int = { Thread.sleep(100) i + j } println(add2(2)(3))2017-09-07T09:36:26.335: [start]add(1, 2)
2017-09-07T09:36:26.400: [end][0 ms]add(1, 2) => 3
3
2017-09-07T09:36:26.406: [start]add2(2)(3)()
2017-09-07T09:36:26.515: [end][107 ms]add2(2)(3)() => 5
5
Also see samples.
case class User(name: String) @timeLogging(println, Input) def input(name: String): User = { Thread.sleep(Random.nextInt(200)) User(name) } @timeLogging(println, Output) def output(name: String): User = { Thread.sleep(Random.nextInt(200)) User(name) } @timeLogging(println, Simple) def simple(name: String): User = { Thread.sleep(Random.nextInt(200)) User(name) } @timeLogging(println, Full) def full(name: String): User = { Thread.sleep(Random.nextInt(200)) User(name) } simple("simple") input("input") output("output") full("full")[start]simple(...)
[end][41 ms]simple(...) => (...)
[start]input(input)
[end][113 ms]input(input) => (...)
[start]output(...)
[end][32 ms]output(...) => User(output)
[start]full(full)
[end][160 ms]full(full) => User(full)
in build.sbt
lazy val metaMacroSettings: Seq[Def.Setting[_]] = Seq( resolvers += Resolver.sonatypeRepo("releases"), resolvers += Resolver.bintrayIvyRepo("scalameta", "maven"), addCompilerPlugin("org.scalameta" % "paradise" % "3.0.0-M9" cross CrossVersion.full), scalacOptions ++= Seq( "-Xplugin-require:macroparadise", // "-Ymacro-debug-lite" // for debug ) ) project.settings( metaMacroSettings, libraryDependencies += "net.petitviolet" %% "mlogging" % "<latest-version>" )