/* * Copyright 2018-2020 ProfunKtor * * 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 dev.profunktor.redis4cats import cats.effect.{ IO, Resource } import dev.profunktor.redis4cats.algebra.StringCommands import dev.profunktor.redis4cats.effect.Log.NoOp._ object RedisStringsDemo extends LoggerIOApp { import Demo._ val program: IO[Unit] = { val usernameKey = "test" val showResult: Option[String] => IO[Unit] = _.fold(putStrLn(s"Not found key: $usernameKey"))(s => putStrLn(s)) val commandsApi: Resource[IO, StringCommands[IO, String, String]] = Redis[IO].utf8(redisURI) commandsApi .use { cmd => for { x <- cmd.get(usernameKey) _ <- showResult(x) _ <- cmd.set(usernameKey, "some value") y <- cmd.get(usernameKey) _ <- showResult(y) _ <- cmd.setNx(usernameKey, "should not happen") w <- cmd.get(usernameKey) _ <- showResult(w) } yield () } } }