reintroduce a removed implicit logger and deprecate it (#352)

build.sbt

@@ -1,7 +1,7 @@
 val devMode = settingKey[Boolean]("Some build optimization are applied in devMode.")
 val writeClasspath = taskKey[File]("Write the project classpath to a file.")
 
-val VERSION = "0.5.4"
+val VERSION = "0.5.5"
 
 lazy val catsCore = "1.5.0"
 lazy val circe = "0.10.1"

core/src/main/scala/com/criteo/cuttle/package.scala

@@ -34,7 +34,7 @@ package cuttle {
   *  - [[Scheduler]] is defined for a given [[Scheduling]] mechanism.
   *  - [[Execution]]s are created by a [[Scheduler]] for a given [[Job]] and [[SchedulingContext]].
   *  - [[Executor]] handles the [[SideEffect]]s execution.
-  *  - [[SideEffect]]s are plain asynchronous Scala functions and can use [[ExecutionPlatform]]s to
+  *  - [[SideEffect]]s are plain asynchronous Scala functions and can use [[com.criteo.cuttle.ExecutionPlatform]]s to
   *    access underlying resources.
   */
 package object cuttle {
@@ -43,6 +43,7 @@ package object cuttle {
   type XA = Transactor[IO]
   private[cuttle] val NoUpdate: ConnectionIO[Int] = Free.pure(0)
 
+
   /** The side effect function represents the real job execution. It returns a `Future[Completed]` to
     * indicate the execution result (we use [[Completed]] here instead of `Unit` to avoid automatic value
     * discarding, but [[Completed]] do not maintain additional state).
@@ -61,4 +62,16 @@ package object cuttle {
     */
   implicit def scopedExecutionContext(implicit execution: Execution[_]): ExecutionContext = execution.executionContext
 
+  /** Default implicit logger that output everything to __stdout__ */
+  @deprecated("Global implicits are bad, this implementation will be removed in a next version, please switch to yours.", "01/28/2019")
+  implicit val logger = new Logger {
+    def logMe(message: => String, level: String) = println(s"${java.time.Instant.now}\t${level}\t${message}")
+    override def info(message: => String): Unit = logMe(message, "INFO")
+    override def debug(message: => String): Unit = logMe(message, "DEBUG")
+    override def warn(message: => String): Unit = logMe(message, "WARN")
+    def warning(message: => String): Unit = logMe(message, "WARNING")
+    override def error(message: => String): Unit = logMe(message, "ERROR")
+    override def trace(message: => String): Unit = ()
+  }
+
 }

examples/src/main/scala/com/criteo/cuttle/examples/package.scala

@@ -7,8 +7,8 @@ package object examples {
     def logMe(message: => String, level: String) = println(s"${java.time.Instant.now}\t${level}\t${message}")
     override def info(message: => String): Unit = logMe(message, "INFO")
     override def debug(message: => String): Unit = logMe(message, "DEBUG")
-    override def warn(message: => String): Unit = logMe(message, "WARNING")
+    override def warn(message: => String): Unit = logMe(message, "WARN")
     override def error(message: => String): Unit = logMe(message, "ERROR")
-    override def trace(message: => String): Unit = logMe(message, "TRACE")
+    override def trace(message: => String): Unit = ()
   }
 }