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TestingLogger.scala
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TestingLogger.scala
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/*
* Copyright 2018 Typelevel
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.typelevel.log4cats.testing
import org.typelevel.log4cats.SelfAwareLogger
import cats.effect.Sync
import cats.implicits._
import java.util.concurrent.atomic.AtomicReference
import scala.annotation.tailrec
trait TestingLogger[F[_]] extends SelfAwareLogger[F] {
import TestingLogger.LogMessage
def logged: F[Vector[LogMessage]]
}
object TestingLogger {
sealed trait LogMessage {
def message: String
def throwOpt: Option[Throwable]
}
final case class TRACE(message: String, throwOpt: Option[Throwable]) extends LogMessage
final case class DEBUG(message: String, throwOpt: Option[Throwable]) extends LogMessage
final case class INFO(message: String, throwOpt: Option[Throwable]) extends LogMessage
final case class WARN(message: String, throwOpt: Option[Throwable]) extends LogMessage
final case class ERROR(message: String, throwOpt: Option[Throwable]) extends LogMessage
def impl[F[_]: Sync](
traceEnabled: Boolean = true,
debugEnabled: Boolean = true,
infoEnabled: Boolean = true,
warnEnabled: Boolean = true,
errorEnabled: Boolean = true
): TestingLogger[F] = {
val ar = new AtomicReference(Vector.empty[LogMessage])
def appendLogMessage(m: LogMessage): F[Unit] = Sync[F].delay {
@tailrec
def mod(): Unit = {
val c = ar.get
val u = c :+ m
if (!ar.compareAndSet(c, u)) mod()
else ()
}
mod()
}
new TestingLogger[F] {
def logged: F[Vector[LogMessage]] = Sync[F].delay(ar.get)
def isTraceEnabled: F[Boolean] = Sync[F].pure(traceEnabled)
def isDebugEnabled: F[Boolean] = Sync[F].pure(debugEnabled)
def isInfoEnabled: F[Boolean] = Sync[F].pure(infoEnabled)
def isWarnEnabled: F[Boolean] = Sync[F].pure(warnEnabled)
def isErrorEnabled: F[Boolean] = Sync[F].pure(errorEnabled)
def error(message: => String): F[Unit] =
if (errorEnabled) appendLogMessage(ERROR(message, None)) else Sync[F].pure(())
def error(t: Throwable)(message: => String): F[Unit] =
if (errorEnabled) appendLogMessage(ERROR(message, t.some)) else Sync[F].pure(())
def warn(message: => String): F[Unit] =
if (warnEnabled) appendLogMessage(WARN(message, None)) else Sync[F].pure(())
def warn(t: Throwable)(message: => String): F[Unit] =
if (warnEnabled) appendLogMessage(WARN(message, t.some)) else Sync[F].pure(())
def info(message: => String): F[Unit] =
if (infoEnabled) appendLogMessage(INFO(message, None)) else Sync[F].pure(())
def info(t: Throwable)(message: => String): F[Unit] =
if (infoEnabled) appendLogMessage(INFO(message, t.some)) else Sync[F].pure(())
def debug(message: => String): F[Unit] =
if (debugEnabled) appendLogMessage(DEBUG(message, None)) else Sync[F].pure(())
def debug(t: Throwable)(message: => String): F[Unit] =
if (debugEnabled) appendLogMessage(DEBUG(message, t.some)) else Sync[F].pure(())
def trace(message: => String): F[Unit] =
if (traceEnabled) appendLogMessage(TRACE(message, None)) else Sync[F].pure(())
def trace(t: Throwable)(message: => String): F[Unit] =
if (traceEnabled) appendLogMessage(TRACE(message, t.some)) else Sync[F].pure(())
}
}
}